News Articles

See below for a list of our white papers, new product launches, company announcements and other important news. Check back here often to stay up-to-date on the latest developments at MPI.

MPI News Articles

White Paper: A Case for KEN-FLEX™07/09/2026MPI
To see more drawings and photos related to this text, download the PDF. ADVANTAGES OF RESILIENT HINGE CHECK VALVES OVER TRADITIONAL SWING CHECK VALVES Check valves are very old. There is evidence that Romans began using check valves to control water flow through their cities between 312 and 270 BC. These were simple “flap” style check valves made of bronze or leather. While these designs were simplistic, the same principle is still used in today’s modern check valves. By the 1st century BC, Romans had implemented the first force pumps, using dual pistons, each with two check valves, to provide continuous high-pressure water for firefighting. This basic design is still used today for modern hand-operated and powered reciprocating pumps. The modern swing check valve design was patented by Andrew E. Anderson for the Crane Company in 1960. It featured a metal hinged disc that swung completely out of the flow path, along with a bolted bonnet that allowed the valve to be serviced without removing it from the pipeline. This design was revolutionary for its time, combining a simple and mechanically reliable method of backflow prevention with a “full waterway” geometry. When fully open, the disc rotates clear of the flow stream, minimizing headloss and allowing near-unrestricted flow. The addition of the bolted bonnet also marked a major advancement in maintainability, enabling inspection and internal component replacement without cutting the valve out of the line – significantly reducing downtime in municipal and industrial systems. However, the same features that made the design successful also introduced inherent limitations. The large angular travel of the hinged disc – often approaching 90 degrees – means the valve relies on gravity and reverse flow to close. This results in delayed closure, allowing reverse flow to develop before the valve seals. This delay makes the swing check valve particularly susceptible to slamming, where the disc closes abruptly under reverse flow conditions and generates pressure surges known as water hammer. These surges can lead to noise, vibration, and potential damage to the valve, piping system, and connected equipment. In addition, the design is sensitive to flow conditions. Low flow velocities can cause the disc to flutter, while turbulent flow can lead to oscillation, increased wear on hinge components, and premature failure. As a result, although the 1960 design became an industry standard due to its simplicity and low resistance to flow, it often requires supplemental closure devices – such as lever-and-weight systems or oil dashpots – to control disc movement and mitigate these operational challenges. Today’s design has not changed dramatically from the one patented in 1960, aside from the disc being reshaped to help with clogging issues and closure devices being gradually improved. Swing check closure devices have slowly evolved from early designs established in the 1800s into the modern systems we use today. Closure devices are meant to prevent slamming, which in turn prevents water hammer. One of two approaches is used to prevent slamming: 1) Close as quickly as possible in systems that cannot tolerate any backflow. Components like positive displacement pumps (gear pumps, diaphragm pumps), centrifugal pumps, and vertical turbine pumps are highly susceptible to damage if any backflow occurs. 2) Slowly allow the disc to swing close in systems that allow backflow. Some components like submersible pumps and axial flow pumps can tolerate a moderate amount of backflow. Some systems will also tolerate moderate backflow, yet still require a check valve to prevent catastrophic, uncontrolled reverse flow. This is also frequently the case for longer pipelines. Over the last 150 years, four types of manual closure devices have been implemented in the municipal market. Two of these promote fast closing times, and two help slow the closing rate, as discussed in the following table. INTRODUCTION OF THE RESILIENT HINGE CHECK VALVE The swing check valve remained the standard for the water and wastewater industry for decades, until the resilient hinge check valve was first introduced to the market in 1965. This was a revolutionary design, considering it eliminated all internal components of the standard swing check and replaced them with a single piece – a metal disc, fully encapsulated in rubber. This original design has been refined several times to give us the modern resilient hinge check valve we use today. RESILIENT HINGE VS. SWING CHECK The modern resilient hinge check valve has been rapidly replacing the standard swing check valve due to several factors. Simplicity A resilient hinge check valve only has one moving component. This dramatically reduces the risk of premature component wear due to disc oscillation in low-flow situations. A swing check valve has several components that are prone to premature wear if the flow guidelines for a swing check valve are not adhered to. (Most manufacturers recommend a minimum flow rate of 5 feet per second to hold the disc tight to the body or open stop.) Fast Closing A resilient hinge check valve has a very short travel of 27 to 35 degrees compared to a standard swing check’s disc travel of 75 to 90 degrees. The shorter travel naturally prevents slamming because the disc takes much less time to swing shut when the flow reverses. Long Lifespan The KEN-FLEX style resilient hinge is reversible. This allows both a quick fix if the seat is damaged by sharp debris and the long-term benefit of doubling the lifespan of the original valve. It is true that the seat ring on a swing check valve can be replaced without fully rebuilding the disc and hinge mechanism. However, when the disc ring wears out through normal operation, several other internal components typically require replacement as well. In either case, replacing the seat ring requires the swing check valve to be completely disassembled. No External Components A resilient hinge check valve is completely maintenance free with no external packing glands like a swing check valve. Packing glands require routine tensioning and rebuilding to prevent leaks around the shaft. Anti-Clog Design While both the swing check valve and resilient hinge check valve have a full port design, the resilient hinge check valve body was specifically designed to provide a smooth flowing, anti-clog solution for pipelines containing raw sewage, heavy solids, and fibrous material. The disc of the traditional swing check valve has been redesigned in recent years to have a domed shape which does help prevent matting or ragging on the disc. (Matting or ragging is where long-strand materials like hair, dental floss, and wipes twist together to form ball or rope-like obstructions, respectively.) However, the larger body cavity creates a zone of lower fluid velocity and turbulence. In wastewater or sludge applications, solids drop out of suspension in these low-flow pockets, causing heavy sediment build-up. The hinge mechanism(s) and hardware that hang in the flow path are undesirable for applications with solids present. Even with a modern disc that is domed to shed debris, these sharp edges and narrow joints act as an internal anchor. Rags, hair, and stringy materials catch on those points and gradually gather more debris over time. AN ADVANTAGE OF BOTH DESIGNS: SPRING ASSISTED CLOSURE In applications where it is critical that the check valve closes before any backflow occurs, such as installing a check valve immediately downstream of a turbine pump, a spring assisted closure device is routinely the recommended solution. Both the swing check and the resilient hinge valves have spring assist options. A swing check valve can be equipped with a lever & spring closure device to rapidly close the disc before any backflow occurs. A resilient hinge check valve can also be equipped with a spring assisted disc. This is either a stand-alone spring attached to the backside of the disc or a spring with a cover protecting it from collecting media. An example of a fully protected spring closure device is an MPI spring-loaded position indicator. Note: Some manufacturers utilize a leaf spring design that only pushes the disc partway closed. The most effective way to prevent slamming is with a spring that pushes the disc all the way to the closed position. IN SOME INSTANCES, THE SWING CHECK VALVE HAS THE ADVANTAGE Slow Closing Some applications, such as longer pipelines, require that a check valve close slowly to prevent slam, rather than closing as quickly as possible. In these applications, a swing check valve with an oil control closure device is the best method to accurately control the closing of the disc. Lay Lengths The original design of the resilient hinge check valve did not follow AWWA guidelines for lay lengths. This led to several manufacturers producing resilient hinge designs with the same non-standard lay lengths. Fortunately, MPI is now taking steps to standardize the lay lengths of our resilient hinge check valves. This will enable the direct replacement of swing check valves with resilient hinge check valves where an application has been problematic for a standard swing check. SUMMARY In many applications, the resilient hinge check valve is a better choice. Either for its non-clogging design, its fast-closing speed, or its low maintenance costs. The resilient hinge check valve has proven itself with decades of successful use in the municipal water industry and should be considered first before choosing a traditional swing check valve. See our white paper “Understanding Swing Check Valves” for more information.
The Waterman Legacy: Innovation, Resilience, and Service05/29/2026MPI
The Center for Art, Culture and History of Exeter (CACHE) is a nonprofit art and history museum dedicated to preserving and showcasing the cultural heritage of California's heartland. The following article was written by CACHE president, Dwight Miller, on the history of W.A Waterman, whose company was later acquired by MPI. Today, MPI is proud to continue to manufacture a wide range of water control gates and valves under the renowned Waterman brand at our facility in Exeter. The museum at CACHE proudly features an exhibit on Waterman's, the pioneering local company founded in 1911 to manufacture valves and other specialized products essential for directing the flow of water. These innovations revolutionized irrigation systems on farms across the globe. For many years, Waterman’s was the largest private employer in Tulare County, leaving an indelible mark on the region’s economy and infrastructure. But who was W.A. Waterman, and what led him to establish his business in Exeter, California? The Man Behind the Name Born in 1875, W.A. Waterman was the second of four children of William F. Waterman and Lydia (née Howard). Raised on a dairy farm in San Luis Obispo County, he developed a keen mechanical aptitude, excelling in both metalworking and plumbing – skills that would serve him well in his future endeavors. In 1893, he was among the earliest students to enroll at Stanford University, which had only opened its doors a year prior. To support himself through school, he took on work in plumbing and metalworking, gaining invaluable hands-on experience. Upon graduating, he found steady employment in Palo Alto, a city brimming with opportunity due to the university’s rapid growth. In 1901, W.A. married Flora Upton, and together they built a life centered on family and ambition. Their first three children – Edwin (1902), Marion (1903), and Herrick (1904) – arrived in quick succession. Waterman’s reputation as a skilled machinist and entrepreneur extended beyond Palo Alto, but fate soon intervened. From Disaster to Opportunity The devastating 1906 earthquake that reduced much of Palo Alto to rubble also destroyed W.A.’s shop. Undeterred, he relocated his business to San Jose, drawn by the region’s thriving agricultural and irrigation industries. However, after experiencing the chaos of the earthquake firsthand, he and Flora sought a more stable environment – far from the tremors of “earthquake country.” Exeter Beckons In 1910, John Van Cleve, a major client based in the small Central Valley town of Exeter, urged Waterman to relocate. Van Cleve’s company produced concrete irrigation pipes and relied on Waterman’s valves to regulate water flow. Seeing an opportunity, W.A. took the leap. In 1911, he established the Exeter Plumbing Company, moving his family – now with an added infant son – to a home near the Visalia Electric Railroad tracks on North B Street. However, tragedy soon struck – their youngest son, Arthur W., was fatally hit by a train just outside their home in March 1911. Despite this unimaginable loss, W.A. pressed on, dedicating himself to both business and civic service. A Pillar of the Exeter Community Waterman quickly became a key figure in Exeter’s transformation. As a founding city council member, he was appointed Commissioner of the Water System, overseeing the installation of nine miles of water lines and the construction of Exeter's iconic water tower in Wl2 – a critical development for fire protection. He also played a pivotal role in forming Exeter's first Volunteer Fire Department, serving as the second assistant fire chief. A man of deep faith, he was an active deacon in the Methodist Church. By 1915, the Waterman family welcomed their youngest son, Don. A Thriving Enterprise Waterman’s first business, the Exeter Plumbing Company, was built on North E Street, just north of today’s Exeter Flower Shop. At the time, Exeter had endured a series of devastating fires, prompting a push for more fire-resistant brick buildings. Waterman’s new structure – simply called “A Brick” – was celebrated as a modern addition to the downtown district. As his company flourished, the need for a larger facility became evident. In 1926, Waterman constructed a state-of-the-art manufacturing site at the corner of Maple and F Streets (now Exeter Raceway and Hobbies). His innovative irrigation products gained widespread acclaim, and his mastery as a machinist became legendary. Carl Collins, a Waterman’s employee in the 1950s and 1960s later recalled, “Mr. Waterman’s skills were amazing. He was a genius. He designed and built special machines that we were still using years after he was gone.” Civic Dedication and Personal Loss Beyond his business, W.A. Waterman remained deeply engaged in Exeter’s civic and fraternal organizations. He held numerous leadership roles within the Exeter Masonic Lodge and was among the founding members of the Exeter Kiwanis Club in 1923, a group dedicated to supporting the town’s youth. However, hardship struck again in 1936 when his eldest son, Edwin, aged 34 – whom he had been preparing to take over the company – died suddenly from an appendicitis attack. Just months later, Edwin’s widow gave birth to their daughter, Sally, a bittersweet continuation of the family legacy. A Lasting Legacy By June 1943, the Waterman Company was thriving when W.A. suddenly passed away from pneumonia at age 67. His life was one of resilience, ingenuity, and unwavering service. Born during the Grant administration, he lived through the post-Civil War era, the Industrial Revolution, World War I, and the early years of World War II. He witnessed monumental technological advancements – from the rise of the automobile to the dawn of aviation – and endured the economic turmoil of the Panic of 1893 and the Great Depression. Through it all, he adapted, innovated, and contributed. Waterman’s legacy is etched into the fabric of Exeter – its economy, its civic institutions, and its very infrastructure. His story is a testament to perseverance, community spirit, and the power of invention. We invite you to visit the exhibit at CACHE and explore the rich art, culture, and history of California’s heartland.
White Paper: Extended Bonnets in Water Treatment05/06/2026MPI
To see important drawings related to this text, download the white paper PDF. OVERVIEW An extended bonnet is an extension of the valve stem used to elevate an actuator assembly from a below grade application. The extended bonnet consists of an outer bonnet body and an inner stem extension, or torque tube, which transfers torque between the valve stem and the actuator. The outer bonnet body is typically fabricated from a section of steel pipe and two flange adapters to connect the valve to the actuator. The inner stem can be either a single piece stem made from steel round bar, or a multi-piece assembly consisting of steel pipe and machine couplings that interface with the valve stem and actuator. APPLICATION Extended bonnets are an ideal choice for applications which require direct burial or submergence of a valve. In these applications, the addition of the bonnet allows the actuator to be installed a set distance away from the valve, providing grade level access to the actuator for operation and easier maintenance. The outer bonnet body also provides protection from the elements, allowing the inner torque tube to rotate free from any debris. A common example of when an extended bonnet would be used is at the base of a finished (filtered and disinfected) water storage reservoir, or Clearwell. These reservoirs often drain through a network of underground pipe 10 to 20 feet below grade, or “yard piping”, with flow controlled by a butterfly valve at the outlet. Because the butterfly valve typically must also be buried, an extended bonnet allows the actuator to be positioned at grade level, eliminating the need for excavation in the event the actuator needs to be accessed in the future. CONSIDERATIONS There are several factors that must be addressed by both the customer and the manufacturer when ordering an extended bonnet. First and foremost, a length requirement must be provided to the manufacturer upon release of an order. This length can be provided as a flange-to-flange dimension of the bonnet extension itself, or as a centerline-of-pipe to centerline-of-handwheel dimension. The contract documents will typically provide this length requirement as a centerline to grade dimension, and it is standard practice to add 30 to 36 inches from grade level to the centerline of the handwheel for the total centerline-to-centerline length requirement. Once this information has been passed along to the manufacturer, the design process can begin. The most important consideration on the manufacturer’s end is torsional deflection due to the amount of torque that must be transferred throughout the length of the extension. The maximum allowable angular deflection in quarter-turn valves is dependent upon the type of valve, whether the valve is position-seated or torque-seated, and the specified actuator’s allowable overtravel. Referencing AWWA M49, ball and butterfly valves are characterized as position-seated valves, which typically require that the disc or ball is positioned within 1° of the true closed position. AWWA C504 further states that the total deflection of the extension should be less than 3/4° during seating to maintain the closed position. Eccentric plug valves, on the other hand, are characterized as torque-seated valves so there is a little more leeway at the true closed position. M49 suggests a maximum deflection angle within 2° to 3°. As extended bonnet lengths increase, limiting deflection becomes more challenging due to the increased diameter of pipe that would be required. In these cases, a position stop may be utilized at the valve stem in position-seated valves to accurately position the valve in the true closed position, preventing overtravel. When position stops are utilized, the bonnet is allowed to deflect to greater angles and would then be limited to the amount of overtravel in the actuator design. Worm gears, for example, are typically designed with 5° of allowable overtravel which means that we can account for a maximum deflection angle of 5° in the extended bonnet with a position stop. However, manufacturers may choose to limit this further with a factor of safety. If allowable overtravel in the actuator is not accurately accounted for, the actuator can reach its travel limit before the valve fully closes. For torque seated quarter-turn valves, such as an eccentric plug valve, a closed position stop is not required because the seating action limits plug travel. The main requirement is that the allowable overtravel in the actuator is not exceeded at the closed position, and deflection does not exceed 5° at any mid-stroke position per AWWA M49. CONCLUSION In summary, extended bonnets provide a practical and reliable solution for below grade valve installations, particularly in buried or submerged environments. By elevating the actuator, they provide direct access while protecting the torque transmitting components, reducing the potential for any costly excavations. However, achieving a successful installation depends on careful coordination between the engineer and manufacturer — especially in defining the required extension length and ensuring that torsional deflection remains within acceptable limits for the specific valve type. When these factors are properly addressed, extended bonnets offer an efficient and reliable means of maintaining precise valve control in below grade applications. MPI's extended bonnets are compatible with our full range of valve and water control gate products. Learn more and access technical documents and drawings here.
MPI sponsors collegiate racing team05/05/2026MPI
McWane Plant and Industrial (MPI) proudly sponsors the Endurance Racing team at Auburn University. This past weekend, the team competed in their first ever race, earning impressive second- and fourth-place finishes against a competitive field of teams from across the region. Held at Atlanta Motor Speedway, the competition brought together student racers and engineering teams to showcase innovation, teamwork and performance on the track. The Auburn team included Eli Burchell, who interned with MPI – Calera the last two years. This sponsorship reflects MPI and McWane's continued commitment to supporting education and hands-on learning opportunities for the next generation.
White Paper: Engineering Selection Criteria for Water Control Gate Applications03/11/2026MPI
Download the white paper PDF here. OVERVIEW A short, crisp overview of why proper gate selection matters: reliability, safety, cost, and lifecycle performance. Selecting the right water control gate is one of the most important engineering decisions in any hydraulic structure. Proper gate selection drives performance. When the wrong gate type is chosen, the result is usually the same: leakage, difficult operation, frequent maintenance, and avoidable cost over the life of the project. This white paper provides practical selection guidance to help engineers, owners, and project stakeholders consistently choose the right Waterman gate for each application. This white paper is intended to be used as a common reference when evaluating and selecting Waterman’s water control equipment. The selection criteria discussed apply across the following product lines: Slide Gates / Sluice Gates Downward Opening Slide (Weir) Gates Rectangular Butterfly Gates Radial Gates Stop Logs, Stop Gates & Bulkheads Flap Gates Tilting Weir Gates Large Custom Gates Each gate type operates differently, but the same basic selection factors can be used to compare options and select the most appropriate gate for a given application. INTRODUCTION: WATER CONTROL GATES Waterman manufactures a broad range of water control gates, which are used to control or isolate water flow in flood control, water and wastewater treatment plants, irrigation systems, hydropower facilities, and industrial applications. Each project comes with its own set of conditions. Water levels, flow velocity, corrosion exposure, mounting details, and operating frequency can vary significantly from one installation to another. These differences directly affect how a gate performs over its service life. This white paper outlines standardized engineering selection criteria to help evaluate these conditions in a consistent way. The goal is to reduce guesswork and support the selection of reliable, well-suited gate equipment for each specific application. HOW THESE CRITERIA APPLY TO DIFFERENT GATE TYPES Not all Waterman gate products work the same way. Some gates are linear and actuated (like upward or downward opening slide gates, stop logs, stop gates or bulkheads), some are passive or gravity-operated (like flap gates), and others are rotational (like rectangular butterfly gates). Radial gates and tilting weir gates also have their own structural and operating characteristics due to their trunnion-supported design. The key is to understand what the gate is required to do, the hydraulic conditions it will see, how it will be installed and operated, and which materials are best suited? The following criteria should be reviewed when evaluating and selecting a water control gate. While different gate types operate in different ways, these factors provide a consistent basis for comparing options and identifying the most suitable solution for a given application. Application Requirements Start by clearly defining what the gate is required to do. Common application needs include isolation, flow regulation, level control, backflow prevention, or temporary closure for maintenance. Identifying the primary function early helps narrow down the appropriate gate type and avoids selecting equipment that is not well suited for the intended purpose. Functional Parameters Look at the conditions the gate will actually see in service, such as water level, differential head, flow velocity, pressure conditions, and allowable leakage (defined leakage rate based on industry standards). These conditions help determine how strong the gate needs to be, what materials should be used, and how it should be sealed. Understanding these requirements helps ensure the selected gate can handle actual hydraulic pressure, maintain acceptable leakage performance, and operate reliably without deformation or performance issues. Installation Type Evaluate where and how the gate will be installed. Common installation locations include channels, headwalls, treatment basins, pump stations, or pipe systems, and may involve fully or partially submerged conditions. The installation environment directly influences which gate types and configurations are feasible. Typical installation types include: Direct Face Wall Mounted – Gate mounted directly to a concrete wall or structure Wall Thimble Mounted – Used where wall surfaces are uneven or require a formed opening Pipe Flange Mounted – Installed at the end of a pipe Side Wall Embedded – Installed within a channel with the gate frame embedded into the side wall grooves Side Wall Anchored – Installed in a channel with the gate frame anchored to existing side walls or structure Installation conditions also affect structural interface, required clearances, and access for installation, operation, and maintenance. Clearly defining these factors helps ensure the selected gate fits the structure, installs correctly, and performs reliably over its service life. Operation & Control Method Define how the gate will be used and controlled during operation. Consider how often the gate will operate, how quickly it needs to respond, and whether it will be manually/electrically/hydraulically operated, or self-operating based on flow or water level. Operation and control requirements should also account for control needs, operator access, safety, and reliability. Clearly defining these factors helps ensure the selected gate can be operated effectively without unnecessary complexity. Fluid Type Identify the type of fluid the gate will handle, such as clean water, wastewater, seawater, sludge, or industrial effluent. The nature of the fluid helps determine the right material and sealing option for the gate. Corrosive or abrasive fluids may require higher-grade stainless steel, protective coatings, or special seals. Selecting materials suited to the fluid and environment helps extend service life, reduce maintenance, and improve long-term reliability. Lifecycle Cost Don’t look at the purchase price alone. Long-term costs like maintenance, coatings, operation, and eventual replacement matter just as much. Thinking in terms of lifecycle cost usually leads to better value and more reliable performance over time. A slightly higher upfront investment in equipment or automation can reduce operating expenses and minimize downtime over the life of the project. Accessories Identify any supplementary components required for safe operation, installation, and maintenance. Depending on the gate type and application, this may include guides, supports, indicators, covers, lifting provisions, or other handling and safety features. Accessories will be selected based on gate types, operating conditions, water level variation, and maintenance access requirements. Properly matched accessories help improve safety, reliability, and ease of operation. Miscellaneous / Site-Specific Considerations Consider any project specific requirements such as owner preferences, compatibility with existing equipment, site access limitations, or future expansion plans. Waterman water control gates can be customized to meet any specific application needs, ensuring the final solution fits the site and performs as intended while avoiding design or installation challenges later in the project.
White Paper: Elastomer Applications in AWWA Valves02/16/2026MPI
To see images and tables, download the white paper PDF. In the AWWA (American Water Works Association) valve industry, the selection of elastomers is dictated by the need for longevity, reliability, and specific environmental compatibility. There are three primary elastomers used in the waterworks industry, EPDM (Ethylene Propylene Diene Monomer), NBR (Buna-N®), and FKM (Fluorocarbon, Viton®). Each has its own key properties and primary use, with considerable overlap in certain applications. We will not discuss some less used or legacy elastomers in water and wastewater valves like Polyurethane (PU/Urethane), SBR (Styrene Butadiene Rubber), and Neoprene (CR). ELASTOMER MANUFACTURING EPDM, NBR (Buna-N®), and FKM are all manufactured through a three-stage process: creating the raw polymer chains via polymerization, mixing them with additives during compounding, and finally forming permanent cross-links during a heat-and-pressure process called curing (vulcanization) to achieve elasticity. The core difference between these specific types is that their initial raw polymers are made from entirely different chemical building blocks (monomers); EPDM uses ethylene/propylene, NBR (Buna-N®) uses acrylonitrile/ butadiene, and FKM uses specialized fluorinated monomers. This distinct chemical makeup necessitates different, specific curing agents and conditions for each material. BASIC STEPS IN ELASTOMER MANUFACTURING: Raw Materials: Simple monomers (chemical building blocks, e.g., butadiene, ethylene, fluorinated compounds) from petrochemical sources. Polymerization: Monomers are chemically reacted (with peroxide, potassium persulfate, or other initiators) to form long, intertwined polymer chains, creating a basic, non-elastic raw rubber. Compounding: The raw polymer is mixed in specialized equipment with various additives like carbon for strength, plasticizers for flexibility, and curatives (like sulfur or peroxides). Shaping/Molding: The mixed, uncured compound is formed into a desired shape (e.g., sheets, tubes, o-rings) using processes such as extrusion or injection molding (encapsulating a component such as a valve plug or check valve disc). Curing/Vulcanization: The shaped material is heated under pressure, which activates the curing agents to form chemical cross-links between the polymer chains, giving the material its signature elasticity and strength. Finishing & Inspection: The final product may undergo post-curing depending on its application needs. EPDM (ETHYLENE PROPYLENE DIENE MONOMER) EPDM is the most widely used elastomer for waterworks valves that must meet NSF/ANSI Standard 61 for contact with potable (drinking) water. Key Properties: • Weather & Ozone Resistance: Outstanding resistance to UV radiation, ozone, and general weathering, making it ideal for general valve use. • Chemical Resistance: Excellent resistance to polar substances like water, steam, acids, alkalis, alcohols, and glycol-based fluids. • Temperature Range: Broad temperature flexibility, typically from -60°F to 300°F (-50°C to 150°C), with specialty grades able to withstand higher temperatures. Primary Use: EPDM is the standard material for sealing components (like O-rings, gaskets, and valve seats in resilient-seated gate valves and butterfly valves) in fresh water and wastewater applications because of its excellent resistance to water, steam, ozone, and UV radiation, which are all common in these environments. AWWA Standards: AWWA standards for resilient-seated gate valves (AWWA C509 and C515) specify properties of an elastomer that align well with EPDM. Therefore, it has become the preferred elastomer for wedge encapsulation and sealing. Limitations: EPDM’s primary weakness is its poor resistance to petroleum-based oils, most hydrocarbons, and solvents, so it is not ideal in applications where such contaminants might be present. CURING EPDM While there are several types of curing methods used for EPDM, there are two dominant systems used in the AWWA valve industry: Sulfur curing and peroxide curing. Sulfur-Cured EPDM EPDM that is vulcanized using sulfur and accelerators to form sulfur cross-links between polymer chains. • Traditional and widely used • Cross-links are longer and more flexible • Typically lower cost • Used for flexibility, toughness, and cost Peroxide-Cured EPDM EPDM that is vulcanized using organic peroxides, forming carbon-to-carbon cross-links. • More modern curing system • Cross-links are shorter and stronger • Higher material and processing cost • Used for lowest compression set, best aging, and longest seal life Other Methods Other EPDM curing methods not typically used in the AWWA valve industry are: • Hybrid curing (Sulfur + Peroxide) • Resin curing (Phenolic Resin Cure) • Radiation / Electron Beam (E-Beam) curing EPDM Curing Methods Summary NBR (BUNA-N®), NITRILE NBR (Buna-N®) is a general-purpose elastomer used in wastewater applications within the broader water and industrial valve sectors, but less commonly used for potable water systems due to its limitations in chloramines and outdoor/ozone exposure. Key Properties: • Oil & Fuel Resistance: Excellent resistance to oils, greases, gasoline, and hydraulic fluids. This makes NBR (Buna-N®) a go-to choice for wastewater lines that may encounter fuels and oils. • Mechanical Strength: Good physical properties, including high tensile strength, excellent abrasion resistance, and low compression set (easily returns to its original shape after being compressed). This makes Buna-N a great choice for plug valves since they regularly handle abrasive media and the plug facing can experience a high level of compression. • Temperature Range: Effective from approximately -40°F to 250°F (-40°C to 120°C), though the specific range depends on the acrylonitrile content. Primary Use: Its excellent resistance to oils, greases, and some solvents makes NBR (Buna-N®) suitable for applications where the water may be contaminated with hydrocarbons or in general industrial settings involving these substances. AWWA Standards: While not the standard for general water distribution, NBR (Buna-N®) may be specified where oil contamination is expected, or in certain industrial water applications within a plant setting. Limitations: Poor resistance to chloramines, ozone, sunlight, ketones, esters, many acids, and alkalis over time means it is generally inferior to EPDM for typical outdoor and clean water applications. FKM (FLUOROCARBON, VITON®) FKM is a high-performance elastomer used for the most demanding and harsh conditions, but its high cost makes it a specialty material in the AWWA industry. FKM is seen mostly in hot, dry air blower applications. Key Properties: • Chemical & Oil Resistance: Superior resistance to a vast array of chemicals, including most industrial solvents, acids, fuels, and oils, even at high temperatures. • Temperature Range: Excellent heat resistance, typically functioning continuously from -15°F to 400°F (-26°C to 204°C), with intermittent use possible at even higher temperatures. • Environmental Resistance: Excellent resistance to ozone, oxidation, and UV light. Primary Use: FKM is used when a valve must handle a wide spectrum of aggressive industrial chemicals, high temperature air, strong acids, and certain solvents that would degrade EPDM or NBR (Buna-N®). AWWA Standards: FKM is not a “standard” material for typical municipal water valves. It might be specified for niche applications in wastewater treatment plants where specific, strong chemicals are used in processing. Limitations: It exhibits limited flexibility at low temperatures compared to EPDM and is not recommended for use with ketones, amines, or hot water/steam above 100°C. CHEMICAL RESISTANCE For specific chemical resistance needs, a chemical resistance guide should be consulted before selecting an elastomer. Chemical resistance guides can be found on most of the elastomer manufacturer’s web sites. One example is the General Chemical Resistance Guide found on the Dupont® web site. It offers a simple number and color-coded chemical resistance rating for many common elastomers. (See PDF document for an example.) ELASTOMERS APPLICATIONS SIMPLIFIED For basic rules of thumb when selecting an elastomer: EPDM is necessary for most AWWA potable water applications. NBR (Buna-N®) is used for specific oil-resistant needs in wastewater applications. FKM is reserved for extreme chemical and high-temperature environments such as digester systems blowers. Summary Comparison Table
Glossary #3: Valve Types and Industry Standards01/05/2026MPI
Welcome to MPI’s third glossary of industry terminology, this time featuring brief descriptions of a wide range of different valve types. Plus, we also included a list of important industry standards at the end. VALVE TYPES 3-Way Valve – A valve with three ports used to mix, divert, or switch flow between different lines. Common in HVAC systems and process piping. 4-Way Valve – A valve with four ports typically used in reversing applications, such as controlling the direction of flow in heat pump systems. Air Release Valve – A valve that automatically releases trapped air from a pressurized pipeline while it is operating under pressure. Essential for maintaining flow efficiency and preventing air-related disruptions. Angle Body Valve – A compact valve efficient in thermal and space-constrained systems. Angle Seat Valve – Pneumatically operated valve often used in steam, water, or compressed air service. Angle Valve – A valve with an inlet and outlet forming a 90-degree angle, often used for throttling or flow direction changes. Back Flow Preventer – A device that prevents reverse flow of water or other substances into the potable water supply. Balancing Valve – A valve used to regulate and balance fluid flow in a hydronic heating or cooling system, ensuring even distribution and efficient operation. Ball Check Valve – Uses a ball as the check mechanism to prevent backflow. Ball Valve – A valve with a spherical closure element that rotates to open or close the flow path. Butterfly Valve – A valve with a rotating disc that controls flow, commonly used for on/off or modulating services. Check Valve – A valve that allows flow in one direction and prevents backflow. Choke Valve – Used in oil & gas to control pressure and flow from wells. Combination Air/Vacuum Valve – A multifunction valve that allows large volumes of air to escape during filling and to enter during draining, while also releasing smaller pockets of air during operation. Combines the functions of air release and vacuum valves. Cone Valve – A full-bore, high-performance control valve with a cone-shaped plug that moves axially to modulate flow. Known for its ability to handle high pressures and flow rates with minimal cavitation and vibration, often used in dams, reservoirs, and pump stations. Control Valve – A valve that modulates flow, pressure, or temperature, by varying the size of the flow passage, in response to a signal from a controller. Cryogenic Valve – A valve designed with an extended bonnet for extremely low temperatures, typically for liquefied gases. Diaphragm Valve – Uses a flexible diaphragm that presses against a seat to control flow. Double Door Check Valve – A type of check valve with two spring-loaded half-circle doors (or plates) that open with forward flow and close to prevent reverse flow. Often used for low-pressure drop applications in water and HVAC systems. Eccentric Plug Valve – A valve with an offset plug that rotates to seal against the body, ideal for throttling. Expanding Gate Valve – A gate valve with a mechanism that expands the gate to seal against the seats. Extended Blow Down Valve – A valve with extended piping used to discharge sediment or pressure from vessels. Fire Gate Valve – A fire-rated or fireproof gate valve. Fire Hydrant – A specific type of hydrant installed on a water distribution system, providing firefighters with access to high-pressure water during emergencies. Fire hydrants come in dry-barrel (cold climates) and wet-barrel (warm climates) types. Gate Valve – A valve that uses a gate to stop or start flow. Globe Valve – A valve with a disc that moves perpendicular to the seat, ideal for throttling. Hydrant – A general term for a discharge outlet that allows access to a water supply, typically for flushing or fire suppression. Includes various types such as yard hydrants and wall hydrants. Hydraulic Control Valve – A valve that uses hydraulic fluid pressure to control the flow, pressure, or direction of water or other fluids in a piping system. It typically includes pilot valves and actuators to automatically regulate valve operation in response to system conditions. Knife Gate Valve – A gate valve with a sharp-edged blade to cut through thick fluids or slurries. Lift Check Valve – A check valve where the disc lifts off the seat to allow flow. Mixing Valve – A valve that blends two fluid streams (typically hot and cold water) into a single output. Used in plumbing and processing systems for safety and comfort. Mud Valve – A valve typically installed at the bottom of tanks or basins for draining sludge or sediment. Commonly a rising-stem gate valve operated from above. Needle Valve – A valve with a fine, tapered point for precise flow control. Pinch Valve – Uses a pinching mechanism to obstruct flow in flexible tubing, often used in slurry or chemical service. Post Indicator Valve (PIV) – Indicates valve open/closed status in fire protection systems. Pressure Regulating Valve (Pressure Reducing Valve) – A valve that controls the outlet pressure by dynamically limiting the valve opening in response to fluctuations in the downstream pressure. Pressure Relief Valve – Designed to release pressure when it exceeds a set limit, for safety. Pump Check Valve – A check valve or control valve installed on the discharge side of a pump to prevent backflow when the pump is off. Designed to synchronize its operation with pump start/stop cycles and minimize water hammer. Pump Control Valve – A valve designed to manage pressure and flow during pump operation. Reduced Port Valve – A valve with a smaller bore than the pipe diameter, restricting flow. Riser Valve – A valve installed on a vertical pipe ("riser") used to control flow in fire protection, irrigation, or plumbing systems. Often refers to valves located in riser rooms in buildings. Rotary Control Valve (RCV) – A type of control valve where the closure element (such as a plug or disc) rotates to modulate flow. Used for smooth operation and precise control. Rubber Flapper Check Valve – A check valve with a resilient disc that swings on an integral resilient hinge to block reverse flow. Silent Check Valve – A check valve designed with a spring-assisted disc that closes quietly before reverse flow occurs, minimizing water hammer and noise. Frequently used in vertical and high-rise piping systems. Slide Gate – A flat, vertical gate that slides in a frame to start or stop flow in open channels or large pipelines. Common in wastewater treatment plants, flood control structures, and in the handling of bulk dry materials. Slurry Valve – Engineered to handle abrasive or high-solid content fluids. Solenoid Valve – Electromagnetically controlled valve for fluid or gas flow. Surge Relief Valve – A valve designed to relieve pressure spikes in a system. Swing Check Valve – A check valve with a disc that swings on a hinge to block reverse flow. Telescoping Valve – A valve with an adjustable vertical pipe (telescoping stem) used in basins or tanks to draw water at varying levels. Commonly used in wastewater or stormwater structures for flow control. Vacuum Release Valve – A valve that allows air into a pipeline to prevent vacuum conditions when the pipeline is draining or during a sudden pressure drop. Helps prevent pipe collapse or damage. Valve Stem – The shaft that transmits motion from the actuator to the internal valve components. Venturi Valve – A valve designed to control flow using the Venturi effect (constriction to accelerate flow and reduce pressure). V-Port Ball Valve – A ball valve with a V-shaped notch in the ball, allowing for improved flow control and throttling capabilities. Used in applications requiring more precise flow regulation than standard ball valves. Wall Valve – A valve specifically designed to be mounted on the end of a wall pipe. Wedge Gate Valve – A type of gate valve with a wedge-shaped disc for tighter shut-off. INDUSTRY STANDARDS ANSI – American National Standards Institute; sets many valve design standards. API – American Petroleum Institute; defines valve performance standards. ASME – American Society of Mechanical Engineers; sets mechanical and piping standards. Factory Acceptance Test (FAT) – Testing performed before shipment to ensure the valve meets design requirements. Fire Test Certification (API 607/6FA) – Indicates fire-tested valves. Fugitive Emissions Test – Measures stem sealing leakage, especially for environmental compliance (e.g., API 622). ISO - The International Organization for Standardization that develops and publishes international standards. ISO 5211 – International standard for actuator mounting. Leakage Class – Defined by ANSI/FCI 70-2 standards, such as Class II–VI (Class VI is bubble-tight). NACE Compliance – Ensures material compatibility with sour gas (H2S) environments. Site Acceptance Test (SAT) – Testing performed at the installation site to ensure proper function.
MPI introduces cost-effective swing check valve certified for drinking water12/12/2025MPI
McWane Plant and Industrial is proud to introduce the new AWWA C518 Double Disc Swing Check Valve, which is designed to provide a cost-effective solution for clean water applications. This reliable new valve is also NSF 61 and NSF 372 certified, making it an ideal choice for drinking water applications. The new Double Disc Swing Check Valve offers a lower upfront investment compared to other check valves and delivers faster closing action with a smaller installation profile. It requires no maintenance or lubrication, and the automatic closing action means that no actuation or other assistance is required for opening and closing. The valve is available in sizes ranging from 2" to 24" and offers a wide range of high-quality features that assure reliable performance and long-lasting durability.
MPI Introduces the Waterman F-55D Heavy-Duty Flap Gate10/17/2025MPI
McWane Plant and Industrial (MPI) recently introduced the latest flap gate from its Waterman brand. The new Waterman F-55D Heavy-Duty Flap Gate is designed and constructed for long life in critical and high head applications, such as outfalls for roadway drainage, riverways, and wastewater treatment plants, as well as any critical backflow prevention operation where reliable, durable performance is required. Available in sizes ranging from 6" to 108", the F-55D flap gates offer heavy duty ductile iron construction and are rated for up to 55 feet of seating head. Key features of the F-55D include: Heavy-Duty Construction – The frame and cover are precision-crafted from high-strength ductile iron, delivering the rugged durability of steel with the versatility and flexibility of cast iron. The result is less downtime, fewer replacements and lower cost of ownership. Reliable Operation – The hinge bushing features oil-embedded bearing bronze, a premium material known for its exceptional wear and corrosion resistance. This minimizes friction, reduces maintenance and extends service life. Bronze Seals – Unlike common rubber and steel seals, bronze offers exceptional resistance to corrosion, ensuring seal integrity and functionality over time, even in harsh environments – including saltwater, chemicals, and acidic conditions. 2.5° Seat Angle – The angled design ensures positive closure by harnessing gravity and flow dynamics to guide the gate into a secure, leak-resistant seal every time, even in fluctuating water levels and/or debris-laden flows. Pump Discharge Solution – An optional spring bumper is available for pump discharge applications, featuring a neoprene seal and 125-pound flange to deliver unmatched reliability – reducing wear and preventing the flap from over-extending.
Glossary #2: Actuators & Closure Controls09/25/2025MPI
For Part 2 of our glossary of terminology used in the valve industry, we’re covering the vast array of terms related to the general topic of actuators and closure controls. We hope you find this helpful! 4-20A Signal – Standard analog control signal for valve actuators and sensors. Actuator Sizing Torque (AST) - The minimum required shaft torque (MRST) multiplied by a safety factor. Battery Back-up – An auxiliary power system designed to provide emergency electrical power to an actuator in the event of a primary power failure. Bevel Gear – A gear mechanism used to change the direction of drive force; often used in manual valve actuators. Breakaway Torque – See Unseating Torque Chain Lever - A mechanical lever or bar, attached directly to the valve stem, with a chain attached to each end of the bar, used to open and close the valve. The chain allows a person to operate the lever at large distance below the valve Chain Wheel – A wheel operated by a hanging chain to actuate valves located at a height. Closed Limit – The predetermined mechanical or electrical stopping point at which the actuator ceases motion when the valve reaches its fully closed position. Cylinder Operator (Actuator) – A valve actuator powered by hydraulic or pneumatic cylinder(s). Dampener – A device (typically a hydraulic or pneumatic cylinder) that resists the opening or closing of a valve. Dampening Cylinder – A hydraulic or pneumatic device used to slow down or control the motion of a valve, gate, or actuator to prevent shock, vibration, or abrupt movement. Dashpot – A device that resists the valve actuation by use of a dampener. Typically, a hydraulic cylinder used to resist the closing of a check valve. Deadman Handle – A handle that returns the valve to a safe position when released. Declutch – A mechanical feature that allows manual operation of the valve by disengaging (declutching) the actuator’s drive mechanism from the valve stem or gear train. Device Net – An industrial communication protocol used to connect control devices such as sensors, actuators, and programmable logic controllers (PLCs) within a network. De-Zincification Resistant (DZR) – Material property for brass valves in potable water systems. Diaphragm Operator (Actuator) – An actuator that uses a diaphragm, typically driven by air pressure, to move the valve stem. Drive Bushing – an adapter that connects the actuator output to the valve stem. Ethernet IP – An industrial automation protocol that uses standard Ethernet technology to connect industrial devices like PLCs, sensors, actuators, and drives for real-time control and data exchange. Electro-hydraulic Actuator - A valve actuator that combines electrical control with hydraulic power to operate valves that typically require high force. EMO – Electric Motor Operator; an actuator powered by an electric motor. Explosion Proof – A electrical enclosure designed to contain any internal explosion and prevent it from igniting a hazardous atmosphere outside the enclosure. Extension Stem – The rod that connects the actuator or handwheel to the valve closure element. Fail Close/Open/In Place – Describes the default position a valve returns to upon loss of power or signal. Fail Safe – A valve or actuator design that moves to a predetermined safe position upon loss of power. Foundation Fieldbus – A digital, bi-directional communication protocol used in process and manufacturing automation to replace traditional 4-20 mA analog signals. Gearbox – a mechanical device containing gears that transfers rotating power from a source to another component, typically used to change the speed and torque of the rotating power. Gear Reducer – a mechanical device containing gears that increases or reduces rotating speed from a source to another component. Hand Lever - A mechanical lever or bar used to open and close a valve. HART Protocol – A communication protocol used for digital smart valve controllers. Hold Open Device – A device used to hold a check valve open. HWO – Hand Wheel Operator; a valve operated manually by a wheel. Hydraulic Operator (Actuator) – Uses pressurized fluid for actuation. Hydraulic Power Unit (HPU) – A self-contained system that generates and supplies pressurized hydraulic fluid to power hydraulic actuators or control valves. It typically includes a reservoir, pump, motor, filters, and control elements. Indicator Post – Displays the open/closed status of buried OS&Y gate valves. Indicator Plate – a plate on an actuator providing indication of the actuator's position in relation to fully open or closed. Intrinsically Safe – a design approach for electrical equipment that ensures the equipment cannot release enough electrical or thermal energy to ignite an explosive atmosphere. IP Rating – (Ingress Protection rating) is a standardized system that classifies the degree of protection an enclosure provides against the intrusion of foreign objects and moisture. It's a two-digit code, with the first number indicating protection against solids and the second against liquids. I/P Converter – Converts current signal (4–20 mA) to pneumatic (3–15 psi) for actuator control. Key Stop – A device to limit valve travel or indicate fully open/closed positions. Lever Actuator – A mechanical lever or bar, attached directly to the valve stem, used to open and close a valve. Limit Switch – Indicates the valve's open or closed position. Limit Torque Switch – See Torque Limit Switch Local Controls – see Remote Hand Station Local Hand Station – see Remote Hand Station Locking Device – A mechanism that allows a valve to be locked in position. Manual Gear Operator (Actuator) – A gear mechanism for manually operating a valve with reduced torque effort. Manual Override - A mechanical feature that allows manual operation of the valve by disengaging (declutching) the actuator’s drive mechanism from the valve stem or gear train. Maximum Allowable Stem Torque (MAST) - The greatest torque to which a valve stem can be subjected to without mechanical failure. Mechanical Stops – A mechanism used to adjust and limit the open and closed position of a valve. Minimum Required Shaft Torque (MRST) - The operating torque values through the entire valve opening and closing strokes. Miter Gear – A gear set used to transmit motion at a 90° angle. Modbus – a standard communication protocol used to establish communication between industrial electronic devices, typically over serial lines or Ethernet. Modbus RTU (Remote Terminal Unit) – a binary-encoded version of the Modbus protocol, typically used over RS-485 or RS-232 serial communication lines. Modbus TCP/IP (Transmission Control Protocol/Internet Protocol) – A variation of the Modbus protocol that enables communication between industrial automation devices over an Ethernet network using the TCP/IP protocol. Modulating Service – Valve use in applications requiring precise control of flow. Multi-Turn Valve – Requires multiple rotations to operate the valve. NEMA – A rating system established by the National Electrical Manufacturers Association (NEMA) to classify the level of protection that an electrical enclosure provides against environmental factors like dust, water, and corrosion. Non-Intrusive – Enclosures in industrial settings that protect sensitive equipment from harsh conditions (dust, water, chemicals, etc.) without requiring physical penetration into the protected space or device. Nut – See Operating Nut NRS – Non-Rising Stem; a valve stem that does not extend when the valve is operated. Open/Close Service – Valve service limited to full open or full closed operation. Open limit – The predetermined mechanical or electrical stopping point at which the actuator ceases motion when the valve reaches its fully open position. Operator – A mechanical device that moves or controls a mechanism or system; in valves, it opens or closes the valve via electric, pneumatic, or hydraulic power. Operating Nut – The drive nut that permits opening and closing valves using a wrench. Operating Torque – The torque needed to operate the valve under pressure. OS&Y – Outside Screw and Yoke; a valve with an externally rising stem for position indication. Pneumatic Booster – Device that increases air pressure for faster actuator response. Pneumatic Operator (Actuator) – Uses compressed air to operate the valve. Positioner - A device that controls the position of a valve, by adjusting the actuators’ air pressure, in response to a signal from a controller. Position Feedback – Sends information about valve position to a control system. Position Indicator – A device that visually shows the position of a valve, indicating whether it's open, closed, or in an intermediate position. Profibus – (Process Field Bus) A standardized fieldbus communication protocol used in industrial automation. Proximity Switch – A non-contact sensor that detects the presence or absence of an object without physical contact. Rack and Pinion – (Rack and Pinion Gearbox) A type of linear actuator that converts rotational motion (motor, handwheel, chainwheel, or nut) into linear motion which drives the valve stem. Remote Control Station (RCS) – A duplicate actuator interface that allows users to operate an actuator remotely, either via wired or wireless connection. Remote Hand Station – An additional actuator interface that allows users to operate an actuator remotely, typically with very limited functions and via a wired connection. Rim Pull – The amount of force required at the handwheel rim to operate a valve. Rising Stem – A valve stem that moves up visibly when the valve is opened. SCADA – (Supervisory Control and Data Acquisition) - A system used to monitor and control industrial processes, equipment, and infrastructure. It encompasses hardware and software components that allow operators to gather data, visualize it, and make control decisions remotely or locally. Scotch Yolk Operator (Actuator) – An actuator that converts rotary motion to linear using a yoke mechanism. Also known as a Traveling Nut Actuator. Seating Torque – The torque required to seat (close) the valve fully. Single Acting Actuator – see Spring Return Actuator Smart Positioner – A digital device that adjusts valve position and provides diagnostics. Speed Controls – Devices or settings used to regulate the speed of valve movement, often to prevent water hammer or to allow smooth operation in hydraulic or electric valve actuators. They may include needle valves, flow restrictors, or electronic controllers. Spring Return Actuator – An actuator that uses a spring to automatically return a valve to a pre-set "fail-safe" position (either fully open or fully closed) when power or air pressure is lost. Square Operating Nut – A square-shaped nut used for manual operation with a wrench. Stem – See Extension Stem or Valve Stem Stem Guide – A mechanical arm or ring providing support for valve extension stems. Stroke Time – The time it takes for the valve to open or close fully. T-Handle – Industry standard extended wrench used to open and close a valve by mating the T shaped handle’s square receptacle to the square operating nut on the input shaft of a valve. Thermal Expansion – Stress or movement due to temperature changes in the valve or media. Throttling – Regulating flow by partially opening or closing a valve. Throttling Service – Application in which a valve controls flow at a partially open position, rather than a simple on/off service. Torque – A twisting force that causes rotation. Torque Limit Switch – Prevents damage by cutting power at end of valve travel or high torque. Torque Rating – Maximum torque a valve or actuator is rated to withstand. Torque Seating – Uses actuator torque to achieve valve shutoff. Torque Tube – The rotating drive tube extending a valve stem to an elevated position, typically used with a floorstand. Travel Stop – Prevents over-rotation in manual or automated valves. Traveling Nut Operator (Actuator) – An actuator that converts rotary motion to linear using a yoke mechanism. Also known as a Scotch Yolk Actuator. Unseating Torque – The torque required to start valve movement from the closed position. Valve Box – A enclosure used to protect a valve, an actuator, or drive nut from damage or contamination. Typically, it includes a heavy-duty lid to protect the drive nut from vehicle traffic. Valve box Extension – Stackable or telescoping tubing that extends a valve box from ground level to an underground valve actuator. Vane Operator (Actuator) – A rotary actuator using air pressure on a vane to operate a valve. Water Cylinder Operator (Actuator) – A type of actuator powered by water pressure, converting hydraulic energy into mechanical motion to operate valves. Common in systems where water is readily available as a motive force and pneumatic or electric actuation is not ideal. Worm Gear – A gear mechanism used to reduce speed and increase torque for valve actuation. Yoke – The structure that supports the valve actuator and guides the stem movement.
MPI-Calera achieves licensed coater status09/15/2025MPI
Congratulations to the team at McWane Plant & Industrial (MPI) – Calera for officially completing the process of becoming a licensed P-401 coater. This major milestone brings the entire coating process in-house, an achievement that promises to elevate product quality, accelerate delivery timelines and improve profit margins. P-401 is a coating applied to the interior of pipe and fittings for sewer applications. The licensing process requires training, process validation and compliance with industry standards. MPI – Calera passed the initial audit in May, and have work diligently over the past few months to finalize training, fine-tune processes and prepare equipment to meet full operational readiness. As the first facility to become a licensed coater for fittings, they received a lot of assistance from team members at McWane Ductile – Ohio (MDO), a certified coater of ductile iron pipe. Special thanks to MDO Operations Manager Heather Rainwater for teaching their process and helping to translate the operation process to fittings. Another special thanks to MPI – Calera Industrial Painter Holly Tucker who has been instrumental in the start-up and training and Manufacturing Process Engineer Kameron Neal has also been a big part of the success. “Demand is higher than expected. We have added three new team members and capital equipment to keep up with the increased demand.” MPI – Calera Manufacturing Engineer Adam Sims. Bringing coating in-house not only benefits our current product lines but also positions MPI to pursue new business opportunities and offer greater value to their customers. It’s another step forward in McWane's ongoing commitment to operational excellence and innovation. Please join us in celebrating this accomplishment and in thanking everyone who played a role in making it happen!
White Paper: Orientation Rules for Eccentric Plug Valves09/11/2025MPI
To see important drawings related to this text, download the white paper PDF. Plug valve orientation may seem to be a complicated question, especially when solids are involved, but it can be simplified by first eliminating what’s not important to the equation. Before we get into the orientation rules, let’s cover the basics of an Eccentric Plug Valve. Common Components Here are the common components of an Eccentric Plug Valve we will be discussing. • Packing • Bearings • Plug • Bonnet • Grit Seals • Thrust Bearings • Body • Seat Eccentric Action An Eccentric Plug Valve gets its name from a 100-year-old design where the valve seat is offset from the centerline of the valve shaft, thereby providing eccentric action. As the valve opens, the plug will lift or “cam” off the seat as it rotates, preventing the plug from rubbing against the body seat and reducing plug wear. Due to the eccentric action, as the plug face wears, it can be rotated further into the seat to restore a drop-tight seal. Closing Directions Closing directions are easy to remember for eccentric plug valves by using the old mnemonic device: “Righty tighty, lefty loosey.” Standard Eccentric Plug Valves close by rotating the valve stem clockwise and standard gear actuators are also designed to close the valve by rotating the gear input shaft clockwise. Reverse/Direct Pressure A direct pressure condition occurs when the system pressure pushes the plug into the body seat when the valve is closed. Direct pressure is preferred over reverse pressure. A reverse pressure condition occurs when the system pressure pushes the plug away from the body seat when the valve is closed. If a valve must be installed in a reverse pressure condition, it is important to notify the manufacturer at the time of order so that appropriate testing measures can be taken. Reverse pressure can make it more difficult to ensure a drip tight seal at high differential pressures. Rules Around Solids Solids are the #1 factor in determining the orientation of a plug valve. Built-up solids can easily seize a plug to the body of the valve when there is a lengthy time between cycles of the plug valve. To visualize how solids will accumulate in a plug valve, forget about pressure or flow direction and imagine the line with heavy solids dropping out of suspension just after the flow stops. Will the plug get buried if the valve is left in the open position? Will the valve body fill with solids if the valve is left in the closed position? Both answers should be NO. Horizontal Flow with Solids Present A horizontal flow application is the simplest way to prevent solids from interfering with the operation of a plug valve. This corresponds with the industry standard and default orientation for plug valves which has the valve stem installed horizontally and the plug opening upwards into the valve body. Industry standards also have the input shaft of any gear unit facing up, assuming buried installations will need the gear input reaching the ground surface. RECOMMENDED ORIENTATION FOR BURIED SERVICE Vertical Flow with Solids Present In vertical flow applications involving solids, the plug valve should always be installed with the seat on the top side of the valve. This allows the valve to close with the plug up. Solids will build up against the plug face, in the pipeline, and not in the valve body. Note: This results in a reverse pressure situation with the natural head pressure pushing against the plug face. Vertical Stem Applications with Solids Present When a plug valve is buried, it is common practice to extend the bonnet of the valve to keep the manual gear unit or automatic actuator above ground. In this application, the bottom of the plug may be buried in solids. However, this typically is not an issue since there is plenty of room for the solids to be flushed through when the plug is rotated as the largest part of the plug (the face) is not covered in solids. Grit Seals In applications involving solids or grit, it is critical to have a dedicated grit seal protecting the valve stem bearings. You should not rely on a thrust bearing only to keep fine particulate (sand/silt) from penetrating the bearing cavity. Body Designs The shape of the Eccentric Valve body is also something to consider with solids or grit. Compared with other typical designs, the Kennedy/Clow body design allows laminar flow in the body, providing better passage of solids and preventing clogging or buildup in the body. Pressure and Flow Considerations Pressure and flow are secondary factors to the risk of solids accumulating in a plug valve body. However, when possible, a couple of rules should be followed for better performance and reliability. Direct pressure is the preferred installation for a plug valve. This is when the pressure will be pushing against the backside of the plug when the valve is closed, allowing the pressure differential to assist the plug in sealing against the seat. The benefit of this is a lower amount of torque required to operate the valve and to hold the valve closed, meaning a less expensive powered actuator will be required. When a plug valve is used to isolate a gravity fed (clean water) line, the plug valve is typically installed with the seat downstream. This allows the pressure to assist in closing the valve (Direct Pressure). When used to throttle or modulate the flow rate of a (clean water) line, the plug valve is also typically installed with the seat downstream (also Direct Pressure). The reverse is true of the seat location when a plug valve is used for isolating a vertical/uphill (clean water) line after a pump. Since the valve will be used to isolate the line when the pump is shut down, the pressure and flow will be reversed from the normal line pressure and flow. The plug valve should be installed with the seat towards the pump, to prevent reverse flow from the head pressure of the downstream water column (still Direct Pressure). Ask the experts If you have a complex situation beyond what we covered, or just need a second set of eyes to double-check your layout, please contact MPI for help with your valve and pipeline design.
Glossary #1: General Valve Terminology08/04/2025MPI
For anyone new to waterworks valves – or for those who simply want a quick refresher on the common terms used in our industry – we’ve put together this comprehensive list of terms and brief definitions. It’s a quick and easy way to get an overview of important valve terminology, and a valuable reference to use any time you come across a term you’re just not familiar with. Accumulator – A pressure vessel used to store fluid under pressure for future use, typically to maintain pressure, absorb shocks, or provide emergency power. Actuator – A mechanical device that moves or controls a mechanism or system; in valves, it opens or closes the valve via electric, pneumatic, or hydraulic power. Allowable Leakage (Rate) – The maximum allowable leakage past a valve seat. Typically following a standard for each valve type, set by industry associations such as the American Water Works Association. Anti-Cavitation Trim – Reduces or eliminates cavitation damage in control valves. Bi-Directional – A valve that can effectively seal in both directions, allowing flow from either side. Blind Flange – A solid disk used to close the end of a pipe or valve opening. Blowout Proof Stem – A design preventing stem ejection under pressure. Bolted Bonnet – A valve bonnet (cover) that is bolted to the body, allowing easy removal for maintenance. Bonnet – The part of the valve that covers the opening in the valve body through which the stem passes. Bonnet Extension – A combination of an outer support tube and an inner torque tube that extend the actuator mounting flange and valve stem away from the valve. Bore (Port) – The internal diameter of the valve through which fluid passes. Buried Service – Refers to valves installed underground, typically requiring extended stems or operators. Burst Pressure – The internal pressure at which a valve or pipe will rupture or fail. Butt Weld Ends – Valve ends prepared for welding directly to piping, ideal for high-pressure service. Bypass – A secondary flow path used to relieve pressure, preheat lines, or balance systems. Caged Trim – A control valve feature that reduces noise and vibration. Casting Number / Heat Number – Identifiers for material traceability. Cavitation – The formation and collapse of vapor bubbles in liquid flow, potentially causing damage to valve internals. Chevron Packing – V-shaped rings used in sets for sealing valve stems or pistons. Closure Element – The part of a valve (e.g., ball, gate, plug) that stops or permits flow. Curb Box - A enclosure used to protect a valve, an actuator, or drive nut from damage or contamination. Typically includes a lid that allows easy access to the actuator drive nut from a sidewalk or curb. Cv – Flow coefficient; a measure of a valve’s capacity to pass flow. CWP – Cold Working Pressure; the maximum pressure a valve can withstand at ambient temperature. Dead Tight – A very high degree of sealing, implying zero leakage. Design Pressure – The maximum pressure a component is designed to handle during normal operation. Differential Pressure – The difference in pressure between the inlet and outlet of a valve. Dip Tube – A tube extending into a vessel to direct flow or draw fluid from a specific level. Double Block and Bleed – A valve configuration that isolates both sides of a line and bleeds the space between for safety. Double Offset – Design used in butterfly valves to reduce seat wear by offsetting the disc centerline from the body centerline in 2 directions. Drip Tight – Indicates no visible drips or leakage under test conditions. Elastomer - A natural or synthetic polymer having elastic properties, e.g. rubber. End Connection – The type of connection (e.g., flanged, threaded, welded) used to attach the valve to piping. Equivalent Pipe Length – A method of expressing valve pressure drop as an equivalent length of straight pipe. Expansion Joint – A flexible component that absorbs thermal expansion or movement in piping. Extended Bonnet – A bonnet extension used for insulation or cryogenic service. Extension Stem – A shaft used to extend a valve stem or actuator drive nut. Typically used for buried or hard-to-reach valves. Face to Face – The dimension between the inlet and outlet faces of a valve. Facing – The finish or treatment on the sealing face of a flange. Feet of Head – A unit of pressure representing the height of a fluid column. Fire Safe – A valve that maintains tight shutoff during or after exposure to fire. Flange – A flat surface for connecting valves to pipes using bolts. Flat Face – A flange face without a raised surface, used for low-pressure applications. Floating Ball – A ball valve design where the ball floats to press against the downstream seat for sealing. Floor Box – A tube with cover, typically installed in a concrete floor, that protects an operating nut. Floorstand – A stand used to mount a valve actuator in an elevated position for ease of access, ergonomics, or safety. Flow Characteristic – Defines how valve opening relates to flow rate (e.g., linear, equal percentage, quick opening). FOG – Fat, Oil, and Grease in waste systems. Full Port/Bore – A valve with a bore equal to the pipe diameter, offering minimal flow restriction. Gasket – A sealing material placed between flanges to prevent leakage. Gland – A component that compresses packing to create a seal around the valve stem. Gland Flange/Follower – A part that compresses the packing gland to maintain stem sealing. Grease Fitting – Allows lubrication of valve internals. Grooved End – A piping connection with grooves that allow coupling with clamps. Hastelloy – High-performance alloy for corrosive service. Hot Tap – A method for connecting to a pressurized system without shutdown. Hydrostatic Test – A pressure test using water to check valve integrity and leaks. Hysteresis – The lag between input and movement in control valves. Lip Seal – A seal with a flexible lip that contacts a shaft or surface to prevent leakage. Low Emission Packing – Stem packing designed to minimize fugitive emissions. Lube Seats – Valve seats designed to accept grease for lubrication and sealing. Manhole – A small vault or vertical shaft, covered with a heavy lid, providing a person access to a valve or pipeline. Typically buried underground. Mechanical Seal – A sealing device for rotating shafts to prevent leakage. Media – The fluid (liquid, gas, slurry) that flows through a valve. Metal to Metal Seal – A seal formed by metal contact rather than elastomeric materials. Neck – The elongated portion of the valve body leading to the actuator or operator. Neck Extension - A combination of an outer support tube and an inner torque tube that extends the actuator’s mounting flange and valve stem away from the valve. Nipple – A short length of pipe with male threads on both ends. Oxygen Cleaning/Service – Special cleaning and materials to prevent ignition in oxygen-rich environments. Packing – Material used to seal the valve stem against leakage. PIG (Pipeline Inspection Gauge) – A device used to clean or inspect pipelines internally. Piston Effect – A pressure phenomenon where force acts on one side of a closure element. Port – The opening in the valve body that allows fluid flow. Pressure Class – The pressure rating system for valves based on ANSI or API standards. Pressure Envelope – Parts of the valve that contain system pressure. PTFE (Teflon) – A common seat or seal material with high chemical resistance. Purge Port – Used for cleaning or draining the valve cavity. Quarter-Turn Valve – Requires a 90° rotation from fully open to fully closed. Raised Face – A flange face with a raised sealing surface to concentrate gasket pressure. Rangeability – The ratio of max to min controllable flow in a control valve. Reducer – A fitting used to connect pipes and valves of different diameters Resilient Seat – A valve seat made from elastomeric material to provide tight shut-off. Riser – A vertical pipe or conduit used in plumbing and fire protection. RTJ – Ring Type Joint; a high-pressure flange design using a metal gasket. Seat – The surface inside a valve where the closure element seals against. Shell Test – A pressure test of the valve body to ensure structural integrity. Shell Wall Thickness – Wall thickness of valve body as per design pressure requirements. Shutoff Class – Leak rate rating (e.g., Class VI means bubble-tight shutoff). Slip On Flange – A flange that slips over the pipe and is welded into place. Socket Weld Ends – A welding end for small-diameter, high-pressure applications. Standard Port – A valve with a port size smaller than full bore but larger than reduced port. Threaded Connections – Threaded ends (e.g., NPT, BSP) for smaller or low-pressure valve installations. Trim – The internal parts of a valve that contact the media, such as the seat, disc, and stem. Triple Offset – Design used in butterfly valves to reduce seat wear by offsetting the disc centerline from the body centerline in 2 directions and including a third offset on a metal-to-metal seat. Trunnion – A mounted support mechanism used in ball valves to hold the ball in place. Union Bonnet – A bonnet that is screwed onto the valve body for ease of disassembly. V-Packing - V-shaped rings used in sets for sealing valve stems or pistons. Valve – A mechanism used to control the flow of media. Valve Envelope – The physical space or volume a valve occupies when installed. Vault – An enclosure used to house and protect a valve or pipe system. Typically, a buried concrete structure. Vent Plug – A small fitting used to vent trapped air or gas. Vented Ball – A ball with a hole to relieve trapped pressure in the cavity of a closed valve. Water Hammer – A pressure surge caused when fluid in motion is forced to stop or change direction suddenly. Wetted Parts – The components of a valve that come into direct contact with the media being controlled. WOG – Water, Oil, Gas; pressure rating indicating maximum allowable pressure for these media.
White Paper: An Introduction to Rotating Disc Gate Valves05/26/2025MPI
Download the white paper PDF here. Gate valves are one of the most widely used valves in the waterworks industry and have played a vital role in controlling the flow of fluids throughout distribution systems and in-plant applications for hundreds of years. If your application requires a dependable shut off valve capable of withstanding generations of service, a Rotating Disc Gate Valve would be an excellent choice. The Rotating Disc Gate Valve was first introduced in 1908 and has been a staple within the waterworks industry ever since. Its metal seated design conforming to AWWA C500 makes it an excellent choice in both clean water and wastewater services, that no other metal seated gate valve on the market is equipped to handle. STANDARDS The American Water Works Association developed a governing standard for gate valves in the early 1900’s that details the design, manufacture, and test requirements of all metal seated gate valve types used within water supply services, known as AWWA C500. A metal seated gate valve can be characterized by the use of metal materials for their seating surfaces to prevent the flow of fluids. While there are a few different types of metal seated gate valves used within the waterworks industry, such as double disc or solid wedge gate valves, they all contain the same main components. Let’s review the components that are essential in the operation of all metal seated gate valves: • Body: The body houses all valve components and is typically cast of grey or ductile iron for durability. • Bonnet: The bonnet serves as the valve cover, providing access to internal components for maintenance and repair. • Gate or Wedge: The gate is the primary component that blocks or allows the flow of water. In metal-seated gate valves, the gate is typically made of iron or other hard metals to ensure longevity and resistance to wear. • Stem: The stem is the mechanism that connects the actuator to the gate or wedge, allowing it to be raised or lowered. • Seating Surface: Metal-seated gate valves rely on metal-to-metal contact between the gate and the valve seat to create a tight seal. The surfaces are ground and polished to a fine finish to minimize leakage. Per AWWA C500, leakage may not exceed a rate of one fluid ounce of water per nominal inch of valve per hour. • Operator: Device used to move the valve gate open and shut. Common examples of gate valve operators include an operating nut, handwheel, bevel/spur gears, electric actuators, and pneumatic actuators. The Rotating Disc Gate Valve is recognized as a double-disc style gate valve under AWWA C500, but its added features make it superior to all other metal seated gate valves on the market. Let’s review the features which make the Rotating Disc Gate Valve the most reliable gate valve in the waterworks industry today. DISC AND WEDGE SYSTEM The Rotating Disc Gate Valve revolutionized the metal seated gate valve market with its innovative disc and wedge design. Unlike traditional metal seated gate valves, this design eliminates the need for any linkages or pins to hold the components in place within the valve body. The unique assembly consists of an upper and lower wedge, along with two identical discs that nest together within the valve body. This innovative, yet simplistic design makes any future need for parts replacement incredibly simple. With no pins or hardware required for assembly, there is no risk of misplacing small components or assembling the valve incorrectly. This user-friendly design significantly reduces maintenance time and effort, ensuring that the valve remains in optimal working condition with minimal intervention. Additionally, this design prevents the accumulation of debris, as all working parts are free from pockets or cavities that could hinder cycling. This feature further reduces wear and tear, ensuring longevity and consistent functionality. An added benefit of the disc and wedge design is that while the valve is in operation, as the valve closes, the lower wedge bottoms out within the valve body, working with the upper wedge to push the discs into the seated position. This sealing mechanism guarantees a tight seal, while minimizing any friction between the seating surfaces as the discs open and close. ROTATING DISCS The defining feature of the Rotating Disc Gate Valve lies in its innovative rotating discs—a design element that ensures long-term reliability and outstanding performance. The disc design does not require the use of any hardware, which allows the discs to rotate freely about a trunnion centered on the backside of each disc. This rotating action of the discs is a key aspect of the valve’s self-maintenance capabilities. With every operation, the discs are free to rotate, effectively cleaning themselves and removing any build-up that could damage the seating surfaces over time. This self-cleaning mechanism is crucial in preventing the accumulation of debris and mineral deposits, such as tuberculation, that could lead to premature deterioration of the seating surfaces. By ensuring that the seating surfaces remain clean and free of debris, the valve maintains optimal sealing performance over extended periods, reducing maintenance requirements and prolonging service life. Beyond its self-cleaning benefits, the rotating disc action creates a new seating position with each closure, virtually eliminating any potential for uneven or excessive wear to the seating surfaces. In contrast, traditional double disc gate valve discs are fixed throughout operation, which makes it possible for wear patterns to develop over time. These wear patterns can compromise the valve’s sealing capability, resulting in leaks that exceed allowable limits. In contrast, the Rotating Disc Gate Valve’s design ensures that the seating surfaces experience even wear, as the discs continuously change their contact points with each operation. This not only extends the lifespan of the valve but also enhances its reliability and performance. Customers can have confidence in the valve’s ability to provide a consistent and secure seal, even after prolonged use in demanding environments. TRACKS AND SCRAPERS Sediment build-up is a common issue within the waterworks industry that has plagued valves in piping systems for decades. This problem arises when particles and debris present in the water supply accumulate inside the valve, leading to a range of complications. Without regular cycling, sediment build-up can become so severe that it causes significant damage to valve internals and can even render the valve completely inoperable. The consequences of this build-up can include reduced system efficiency and increased maintenance costs, which can be both costly and disruptive. MPI’s solution to combat sediment build-up in Rotating Disc Gate Valves is the track and scraper system. This system is comprised of two scrapers attached to the valve wedge that move along a track as the valve opens and closes, effectively scraping away tough build-up with each cycle. An added benefit of utilizing the track and scraper system is that it also acts as an additional support for the disc and wedge assembly. In doing so, the weight is more evenly distributed within the valve and prevents the assembly from exerting excessive stress on the valve stem. The track and scraper system is a standard feature provided on valve sizes 14” and larger when the valve is intended to be installed in a horizontal orientation. FLUSHING PORTS With Rotating Disc Gate Valves installed in a vertical stem orientation, flushing ports are MPI’s solution for debris and sediment build-up within the bottom of the valve cavity. These ports allow for the valve to be flushed with water to ensure smooth operation and reduce the risk of debris being compacted in the bottom cavity. Flushing ports are a standard feature on valve sizes 14” and larger when the valve is intended to be installed in a vertical orientation. Vertical installations are a preferred installation orientation for gate valves whenever possible, as a vertical installation allows gravity to assist with valve closure, resulting in lower operating torque requirements. BYPASS VALVE A bypass valve is an externally mounted isolation valve used to allow fluid flow around a gate valve in the closed position. In the case of a Rotating Disc Gate Valve, MPI utilizes a smaller diameter Rotating Disc as its bypass valve. The intended purpose of a bypass is to equalize pressure on both sides of the closed valve to reduce the required operating torque and wear on the seating surfaces as the valve opens. Bypass valves are an optional accessory on valve sizes as small as 16” and recommended on valve sizes 42” and larger. CONCLUSION The Rotating Disc Gate Valve presents a significant improvement over traditional metal-seated gate valves, particularly in demanding applications where durability, efficiency, and long-term reliability are critical. Unlike conventional gate valves that may struggle with sealing integrity and wear over time, the Rotating Disc Gate Valve enhances performance by minimizing friction during operation, reducing maintenance needs, and extending service life. One of the most suitable applications for this robust valve is within wastewater treatment plants, specifically at the intake system, the essential first step in the treatment process. The intake system serves as the gateway for raw wastewater, collecting and channeling large volumes of influent water into the plant for processing. This raw wastewater often contains heavy debris, sediment, sludge, and other solid contaminants, making it crucial to have a highly resilient shutoff valve capable of managing unpredictable flow conditions while preventing blockages or mechanical failures. With its rugged construction and proven performance, the Rotating Disc Gate Valve is an invaluable component for wastewater treatment facilities seeking long-term operational efficiency and reliability in their flow control systems. For additional information, please contact your local McWane Plant & Industrial representative. Download the white paper PDF here.
MPI Opens New Fabricated Pipe Facility in Calera, Alabama04/10/2025MPI
McWane Plant and Industrial (MPI) is proud to announce the launch of its new state-of-the-art fabricated pipe manufacturing facility in Calera, Alabama. The new location represents the company’s sixth fabrication shop in the United States, and will serve the Southeast region with custom-cut pipe lengths and a wide range of additional products, including: 3” - 54” fabricated ductile iron pipe 3” - 48” grooved ductile iron pipe 3” - 30” swivel anchor pipe couplings 3” - 48” ductile iron wall pipes and sleeves Flange fillers, beveled fillers Valve extensions, steel vent assemblies, steel fabrication Cement, P401, ceramic epoxy, tar, and zinc coatings available The new Calera facility further strengthens MPI’s extensive network of fabrication shops, which are strategically located throughout the country to offer fast delivery to customers from coast to coast. The company’s existing fabrication facilities are located in Wethersfield, CT, Madison Heights, VA, Coshocton, OH, Exeter, CA, and Houston, TX. In addition to its complete fabricated pipe offering, MPI offers a wide range of valves, gates and fittings to meet the needs of water treatment and wastewater treatment plant projects. The company’s comprehensive valve lineup includes butterfly valves, check valves, plug valves, gate valves, mud valves and more. MPI’s products include some of the best-known brand names in the industry, including McWane Ductile, Clear Water Manufacturing, Tyler Union, Kennedy Valve, M&H Valve, Clow Valve, Tri-Seal Valve and Waterman. For questions or more information on the new Calera fabricated pipe manufacturing facility – or to learn more about any MPI’s pipe, valves, gates or fittings – contact your local MPI representative, email us at sales@mcwanepi.com, or complete and submit our contact form.
Introducing MPI’s AWWA C508 Swing Check Valves04/04/2025MPI
McWane Plant and Industrial (MPI), a leading manufacturer of high-quality industrial flow control solutions, has announced the launch of its AWWA C508 Swing Check Valve. This latest addition to MPI’s extensive valve lineup was designed to deliver exceptional performance and worry-free operation for water and wastewater applications, including pump isolation. Engineered for strength and durability, the standard AWWA C508 Swing Check Valve offering features an ASTM A536 ductile iron body plus 316 SS external hardware and a stainless-steel hinge pin as standard (316 SS for sizes 3”-12”, 630 SS for sizes 14”-36”) for enhanced strength and corrosion resistance. The MPI AWWA Swing Check Valve is also configurable with lever & weight or lever & spring in single or dual arrangements for accelerated valve closure. Additional features include: ANSI B16.1 class 125 flange connections AWWA C508 Type B body laying length Full-flow waterway Self-aligning disc (BUNA or bronze facing) NSF-61-approved fusion bonded epoxy coating. Although swing check valves require minimal maintenance, a full-port cover opening allows for inspection or replacement of internal components with the valve remaining in line. With a large manufacturing base, including many factories throughout the United States, MPI AWWA C508 Swing Check Valves can be made in the USA to meet AIS or BABA project funding requirements, when specified. Like all MPI valves, this AWWA C508 Swing Check Valve has been rigorously tested to meet industry performance requirements, is constructed of high-grade materials and is engineered to provide years of trouble-free performance. For complete specifications, drawings and product literature, visit the AWWA Swing Check Valve page.. For questions or more information on MPI’s AWWA Swing Check Valves – or on any or our wide range of valves, pipes, gates or fittings – contact your local MPI representative, email us at sales@mcwanepi.com, or complete and submit our contact form.
McWane Waterworks Group sponsors ASF scholarship04/03/2025MPI
The McWane Waterworks Group was pleased to sponsor a $17,000 Astronaut Scholarship Foundation (ASF) scholarship at Ohio State University. The Astronaut Scholarship Foundation (ASF) was founded in 1984 by the six surviving Mercury 7 astronauts (Scott Carpenter, Gordon Cooper, John Glenn, Walter Schirra, Alan Shepard and Deke Slayton). The Astronaut Scholarship is known nationwide for being among the largest merit-based monetary scholarships awarded to undergraduate STEM juniors and seniors. “We’re proud to sponsor this ASF scholarship that is awarded annually to some of the brightest STEM students in the country,” said McWane Ductile Vice President of Sales & Marketing Mike Dodge. Engineers play a crucial role in the development of our products, and we are pleased to have the opportunity to support students pursuing a degree in engineering. Visit https://www.astronautscholarship.org/about/about-us/ to learn more about ASF.
Announcing the 2024 Environmental Health & Safety awards03/24/2025MPI
We are proud to announce that M&H Valve earned the highly coveted McWane Environmental, Health & Safety (EHS) Excellence Award for the third consecutive year. M&H has been honored to receive this award for a record six times since the program began 22 years ago. M&H demonstrates leadership in living the principles of The McWane Way with ongoing participation in environmental improvements projects including three successful Keep It Clean projects, shared ownership of safety, implementation of the McWane EHS management system and a plant wide commitment to EHS excellence. We established the annual EHS Excellence award – also known as the Screaming Eagle Award – to recognize the facility with the overall best EHS performance across the company. Since its inception, 11 facilities have earned this distinction. We would also like to acknowledge other EHS award winners who have contributed to our efforts in becoming safer and more environmentally conscious: Outstanding Environmental Performance - Foundry McWane Ductile – New Jersey (MDJ) MDJ made significant efforts to implement The McWane Way principles with Community Advisory Panel (CAP) participation and engagement, ongoing environmental improvement projects including second place in the Keep It Clean Challenge with their MiniVac project and improved incident investigations with root cause analysis and corrective actions to reduce repeat incidents. Outstanding Environmental Performance - Fabrication Manchester Tank – Quincy (MTQ) MTQ was recognized for its team effort in driving environmental compliance, improving audit results and a proactive resolution to a water discharge issue. Outstanding Environmental Progress - Fabrication MPI – Exeter MPI Exeter was recognized for its stormwater management improvement project, significant housekeeping and audit performance results, and management and team commitment to The McWane Way. Outstanding Safety Performance - Foundry McWane Ductile – Utah Recognized for their continuous improvement with health and safety audits, maintaining OSHA VPP site status, reducing injuries (lowest total recordable incident rate (TRIR) within McWane foundries), fostering a culture of ownership with personal safety interactions and reporting over 1,200 near misses in 2024. Outstanding Safety Performance - Fabrication MPI – Exeter Acknowledged for continuous improvement with health and safety audits and injury rate reduction, fostering a culture of safety ownership, timely closure of action items and completion of safety training, and continuous implementation of projects to reduce operational risk. Top Quartile Club McWane India – Coimbatore MPI – Houston MPI – Madison Heights Tyler Union – Oxford McWane Ductile – Utah M&H Valve MPI – Exeter Tyler Union – Anniston McWane Ductile – New Jersey Top Quartile Club members must have a TRIR at or below the first quartile rates for their industry as provided by the Bureau of Labor and Statistics. Congratulations to this year’s winners! Building a strong culture requires timely, consistent effort and an unwavering commitment from all levels of the organization. As we continue to learn, adapt and grow together, our culture will evolve and enhance our EHS performance. We are confident the principle of excellence embodied in The McWane Way will continue to guide our company for generations to come.
White Paper: Understanding Swing Check Valves03/03/2025MPI
Download the white paper PDF – complete with drawings and photos – here. Swing check valves are probably the most misunderstood valve in the municipal water works industry. What causes a check valve to slam? How can we prevent it? How does the design of a swing check valve make it susceptible to slam? Why are there so many closure devices available? To answer those questions, we need to understand the problems of water hammer and valve slamming, the general design of a swing check valve, and the pros and cons of each type of closure device available on the market. POTENTIAL PROBLEMS Water and wastewater treatment plants are demanding applications for all types of valves, and swing check valves are no exception. Two critical issues that can be prevented by the proper selection of swing check valves – the related problems of water hammer and valves slamming shut – are described below. Water Hammer Ask Google A.I. and it will tell you “Water hammer occurs when there is a sudden increase or decrease in the rate of flow and pressure of a fluid in a piping system with the most frequent cause being an abruptly closed valve stopping the flow of liquid.” The simplest example of this is when a valve at one end of a system is shut abruptly and the check valve on the other end slams shut due to the reverse flow. This bounces a shock wave back and forth between those valves, traveling at the speed of sound, until it dissipates over time. This shock wave can be so powerful that it bursts fittings or valves in the system. Slamming The design of a swing check valve, with up to 90 degrees of disc swing as it closes, makes it susceptible to slamming much more than other designs of check valves that require less movement to close. Most swing check valve slamming can be prevented with the proper application of a closure device. Check valve closure devices can be added to a standard check valve to provide either a fast closure or a controlled, slow closure. Fast and immediate closure is typically needed with pumps that will be damaged by any backflow. However, in systems that can tolerate backflow, slow-acting closure devices are the easiest way to ensure the check valve will not slam. THE BASICS OF SWING CHECK VALVE DESIGN While all swing check valves feature a swinging disc that opens and closes to control flow and prevent backflow, there are several different design features to consider when choosing these valves for municipal water and wastewater applications. Full Waterway vs. Through Waterway Most swing check valves on the market are of the “Full Waterway” design, also referred to as “Full Port”. This means the waterway of the valve (or “Port”) maintains at least the same area as the pipe it is sized for. A “Through Waterway” design maintains a straight, line of sight, full pipe diameter through the valve. A through waterway swing check valve design typically requires more angle of swing from open to close, increasing the likelihood of slamming. Self-Aligning Disk Swing check valves typically are designed with a disc mounting arm that does not hold the disc rigidly but allows the disc to float and self-align to the body seat ring. This design relies on the disc being held against the upper part of the valve body when the check valve is in the open position, to prevent the disc from fluttering in the flow of media. This adds complexity to the application of a swing check valve when it comes to both flow requirements and turbulence.* *Most manufacturers require flow to be in the range of 5 to 15 FPS. With flow less than 5 feet per second, the disc will not be held against the body and can shake in the flow causing premature wear to the disc and mounting components. Flow above 15 FPS is beyond the upper flow limit of standard check valves and requires a high-flow design like a slanted check valve. *This same shaking of the disc can be caused by turbulent flow if the check valve is placed immediately downstream of an elbow, reducer, pump, or other component that disrupts the flow. Most manufacturers require a swing check to have a minimum straight pipe length of 5 to 10 pipe diameters upstream of the valve to create a more laminar flow past the disc. Seat Materials Body seat ring and disc seat materials are offered in elastomers, bronze, and stainless-steel to accommodate a wide range of media, temperature, chemicals, and abrasives that may flow through a swing check valve. Per AWWA standards, elastomers form a drip-tight seal while metal seats are allowed a certain amount of leakage. Removable Internals Common swing check valve designs allow a main cover to be removed and all internals to be replaced without removing the valve body from the pipeline. SWING CHECK VALVE CLOSURE METHODS There are several check valve closure methods to consider, from a simple lever and spring all the way to a complex hydraulic speed control. Most closure devices connect to the pivot shaft of the valve and control the swing rate of the disc. Let’s review each method starting with a plain check valve. Plain Swing Check Valve (without closure device) A swing check valve can be used without any closure device if the application does not require controlling the closing time and slamming is not a concern. The lack of closure device allows the least amount of headloss as the disc is free to swing with no resistance against the flow other than its own weight. However, without a closure device there is no way to control slamming. PROS: - Low headloss CONS: - Slow closure rate - Slams with reverse flow Lever and Weight Adding a lever with weight to a swing check valve speeds up the closing time due to the weight pushing the disc against the flow. In applications where the flow stops gradually, this can prevent the disc from slamming by closing the valve at the exact moment the flow stops. However, if the flow stops abruptly, using only a lever and weight closure device will likely result in slamming since there is no control over the closing rate. A lever and weight will cause slightly higher headloss than a plain check valve, but the additional force will also assist a pump in building pressure on start-up. Caution should be used when adding large amounts of weight to the swing arm, as excessive weight can damage the pivot shaft if slamming occurs. PROS: - Faster closure rate - Prevents backflow CONS: - Slams on abrupt reverse flow - Risk of shaft damage Lever and Spring A lever and spring closure device is very similar to a lever and weight device. It speeds up the closing time even faster than the lever and weight due to the spring(s) pushing the disc against the flow. In applications where the flow stops gradually, this can also prevent the disc from slamming. Typically, the spring tension can be increased by a threaded tensioner or more springs being added to the device. With more tension, the disc closes earlier in the process of losing line pressure. However, more tension increases headloss. Like the lever and weight, slamming in an abrupt loss of flow is a concern. PROS: - Faster closure rate - Prevents backflow CONS: - Slams on abrupt reverse flow - Higher headloss Air Cushioned Lever and Weight An air cushioning accessory can be added to a lever and weight closure device. The air cushion consists of an air cylinder and a flow control restricting the release of air as the cylinder is compressed by the swing arm during valve closure. This allows all the advantages of having the lever and weight system with the addition of partial control over the closing rate and protection against a large amount of weight damaging the pivot shaft*. However, due to the compressibility of air, this system will not prevent slamming if there is still significant reverse flow when the disc nears the closed position. *The air cushion accessory was originally designed to prevent large weights from damaging the pivot shaft when a swing check valve slammed shut. After introducing this system, it was discovered that the air cushion’s flow control could be set slow enough (in some cases) to delay the closing of the valve until the shock wave returned through the valve - eliminating the potential water hammer. PROS: - Partial control over closure rate - Shaft damage protection CONS: - Allows backflow - Still slams in certain situations Oil Cushioned Lever and Weight Adding an oil cushioning accessory to a lever and weight closure device is one of only a few options effective at preventing slamming. The oil cushion consists of an oil cylinder and flow control(s) that restrict the flow of oil through the cylinder as it’s compressed by the swing arm during valve closure. This provides complete control over the closing rate, protection against a large amount of weight damaging the pivot shaft, and protection against slamming. The oil cushion is much more effective than an air cushion at preventing slamming because the oil is not compressible. This allows the flow control to maintain the desired closing rate all the way to disc closure. PROS: - Full control over closure rate - Shaft damage protection CONS: - Allows backflow Bottom Mounted Buffer Much like an oil cushioning accessory, a bottom mounted buffer is also very effective at preventing slamming. This system consists of a plunger protruding into the final portion of the disc path. The plunger is attached to an oil cylinder with flow control(s), just like the side mounted oil cushioning device. The buffer’s flow controls restrict the flow of oil through the cylinder as it’s compressed by the disc just prior to closure. This provides good slam control and shaft damage prevention but does not give complete control over the closing rate, as the disc only contacts the plunger at the very end of its travel. A bottom mounted buffer is a good choice when headloss is a concern because it can be used without any other closure device, allowing the disc to open unrestricted. The risk of debris or corrosion collecting on the plunger needs to be considered since the plunger is extended into the bottom of the valve body and, in some designs, directly into the flow path. PROS: - Full slam prevention - Low headloss CONS: - Only minimal control over closure rate - Allows backflow - Additional components exposed to media Pumpcheck In situations involving a pump where there can be zero chance of slamming and there can be zero back-flow, a “Pumpcheck” or motorized pump control swing check valve is utilized. A Pumpcheck uses both a standard swing check valve with a cylinder closure control and an electric motor operator (EMO). In normal operation, the EMO receives its signals from either the same controller as the pump or from pressure switch(es) in the line. On pump shutdown, the EMO closes the valve slightly ahead of when the pump stops. On start-up, the EMO opens the check valve slightly after the pump starts. In both pump shut-down and start-up there is zero chance of slamming or back-flow because there is still pressure in the line ahead of the check valve when it is closed. In the case of power failure, the swing check is allowed to operate normally with a standard closure device, preventing slamming. However, with just the cylinder closure control, some back-flow will occur. PROS: - Full slam prevention - Prevents backflow - Precise control over closure rate CONS: - Requires automation - Expensive - Large footprint ADDITIONAL FACTORS More than just the basics of closure devices need to be considered when designing a system with swing check valves in water and wastewater treatment plants. Some of the many factors involved when selecting the proper check valve and closure device are head pressure, length of line, back-flow tolerance, and manifold designs. Also, proper placement of swing check valves in relation to other components can be easily overlooked while designing a system, resulting in a dramatic reduction in the lifespan of the valve’s internal components. The technical sales support team at McWane Plant and Industrial (MPI) is ready to assist you in the selection of the proper closure device for any scenario. Download the white paper PDF – complete with drawings and photos – here.
Introducing MPI’s New High-Performance Butterfly Valve12/02/2024MPI
McWane Plant and Industrial (MPI), a leading manufacturer of high-quality industrial flow control solutions, has announced the launch of its new High-Performance Butterfly Valve. This latest addition to MPI’s extensive valve lineup was designed to deliver exceptional performance, superior sealing capabilities and long life in extreme operating environments. Suitable for a diverse range of high-temperature and high-pressure industrial applications, including chemical processing, oil and gas, and many others, this new Class 150 butterfly valve offers full-rated, bi-directional, dead-end service, and is available in sizes from 2” to 36”. Engineered for strength and durability, this new High-Performance Butterfly Valve features a single-piece WCB or CF8M body with integral disc position stop, plus a double-offset disc for reduced seat and disc wear, extended seat life and lower maintenance costs. Additional features include: Single-piece, blowout-proof retention stem, per API 609 Free-floating, pressure-assisted, solid seat Multi-layered, V-type PTFE packing Self-lubricating 316 SS-backed RTFE bearings Bonnet with ISO 5211 mounting pad The MPI High-Performance Butterfly Valve is also designed for faster and easier installation. The recessed gland and integral ISO 5211 mounting pad enable the actuator to be mounted directly to the valve body. Plus, the valve’s extended neck offers 2” clearance from bonnet to flange, allowing for piping insulation on all valve sizes. Like all MPI valves, this High-Performance Butterfly Valve has been rigorously tested to meet industry performance requirements, is constructed of high-grade materials and is engineered to provide years of trouble-free performance. For complete specifications, drawings and product literature, click here. For questions or more information on the new MPI High-Performance Butterfly Valve – or on any of our wide range of valves, pipes, gates or fittings – contact your local MPI representative, email us at sales@mcwanepi.com, or complete and submit this form.
Announcing the Waterman S-6000 Series Heavy-Duty Sluice/Slide Gates from MPI10/08/2024MPI
McWane Plant and Industrial (MPI), a leading manufacturer of high-quality industrial flow control solutions, introduces the latest slide gate from the Waterman brand. The new S-6000 Waterman Heavy-Duty Sluice/Slide Gates are designed and constructed for long life in critical applications such as dams and rivers, tidal environments, wastewater treatment plants, and any critical operation where the ultimate in reliable, long-lasting performance is essential. The AWWA-C560-21 compliant S-6000 gates are made from cast ductile iron – which is stronger and lighter weight than typical gray iron – feature a proven design from Waterman, one of the industry’s oldest and most reliable manufacturers of cast iron sluice gates, with thousands of gates in operation worldwide. These cast ductile iron gates offer a thick, rigid frame and cover, and are engineered to handle high heads and environments with floating debris. The cover and frame designs are fully tested to meet or exceed AWWA design specifications using finite element analysis. Stress and deflection are calculated to withstand both seating and unseating heads and other external loading. FEA Analysis confirms that the gate will perform with maximum reliability and minimum leakage. Other quality features include: Both the frame and cover feature low leakage and machine matched seating surfaces for a reliable, corrosion resistant closure Bottom seating surfaces are available as metallic in a “standard” bottom or media resistant elastomer for a “flush” bottom installation A “full width dovetail” seat is permanently fixed to the frame and cover, without fasteners or pins, eliminating the possibility of leakage between the seat and the casting Fully adjustable wedge system offers simple adjustment and easy maintenance, guaranteeing performance and consistency in service. The Waterman S-6000 cast gates also offer maximum design flexibility, with a large selection of sizes and mounting options, including wall mounting, circular pipe flange mounting, the extended flangeback design, and more – to meet the needs of even the most unusual applications or retrofits. For complete specifications, drawings and product literature, click here. For questions or more information on the new Waterman S-6000 Heavy-Duty Sluice/Slide Gates – or on any of our wide range of valves, pipes, gates or fittings – contact your local MPI representative, email us at sales@mcwanepi.com, or complete and submit this form.
MPI Madison Heights sponsors golf tournament for Amherst County Public Schools05/13/2024MPI
MPI Madison Heights recently sponsored the Amherst County Public Schools Education Foundation golf tournament. The annual event is a fundraiser for the non-profit organization, which focuses on expanding resources to enhance education for the students and teachers of Amherst County, Virginia. The funds raised help provide items not traditionally funded within the annual school budget.
MPI Exeter supports Visalia Emergency Aid in Race Against Hunger12/04/2023MPI
MPI Exeter team members and their families bundled up to support the Visalia Emergency Aid Council in Visalia, California, for the “Race Against Hunger.” The 19th annual race is the largest 5K run in the Central Valley and supports food access in Tulare County. All funds raised go directly to the food pantry programs that connect households with the necessary food resources.
Alabama Dynamics completes Electrical Motor Control training with Alabama Technology Network08/23/2023MPI
Aabama Dynamics Maintenance Technician Austin Broadhead and EHS Group Director Carlos Robinson participated in a three-day Electrical Motor Control training held at MPI Calera, led by James Hammonds from the Alabama Technology Network (ATN). Austin and Carlos gained valuable knowledge to benefit them and the company. ATN is a member of the Alabama Community College System, serving all 67 counties to support the industry by providing customized workplace training, innovative technical assistance and engineering services. ATN is currently offering free training through federal funding through the end of September.
Waterman wins Ergo Cup at National Applied Ergonomics Conference04/04/2023MPI
Congratulations to Waterman for earning the National Ergo Cup Award at the 2023 National Applied Ergonomics Conference! The team, who placed first in the McWane Ergo Cup Competition, won the national award for their Rotary Weld Fixture. The innovation reduced the physical risk of back and shoulder pain by 95% and reduced setup time, weld time and staffing requirements. The project was recognized in the Ergo Cup “Team-driven Workplace Solutions-Other” category, which includes projects solving non-standard issues such as awkward posture or hand-intensive work. Manufacturing Engineer Jasmin Cisneros, Special Projects Manager Dan Eggleston, Senior Designer Loudvig Berberian, Project Manager David Francis and Lead Machine Operator of Pipe Fab Operation Jacob Gonzales worked together as a team to investigate the welding procedure and identify awkward postures and repetitive motion that could be eliminated with an ergonomic solution. They presented their project at the conference against international competitors, including Cintas, GE Aviation, Honda of Canada, John Deere, Lockheed Martin and Toyota. The Rotary Weld Fixture was selected by a prestigious judges panel of ergo practitioners representing organizations including UConn Health, 3M, Ohio State University, Amazon, Cargill, Lockheed Martin and Liberty Mutual Insurance. Waterman was one of two teams to represent McWane in the competition. Clow Valve demonstrated their Pattern Picker, a motorized tool to pick up patterns from the rack and move them safely to the pattern table without manual lifting. The annual Applied Ergonomic Conference is hosted by the Applied Ergonomics Society, a worldwide organization dedicated solely to the support of the profession and individuals involved with improving workplace performance, quality, sustainability and employee availability.
Waterman takes top honors at 2022 McWane Ergo Cup Competition11/07/2022MPI
Congratulations to the winners of the 2022 McWane Ergo Cup! This year’s field of projects was excellent, which made it difficult for our group of outside judges pick a winner. First, congratulations to Waterman, from the valve and hydrant group for winning 1st place. Their Rotary Weld Fixture was well received, and the employee testimonial was fantastic. Clow Valve Foundry’s Pattern Picker came in a close second. Rounding out the awards were Kennedy Valve’s Hoist Changeout device for the project with the best overall risk reduction and Amerex’s PEX Collar Rework project for most innovative. Be sure to read about Waterman’s SS-250 Frame and Slide Weldment Project and why this ergo solution stood out among its peers in the upcoming issue of McWane magazine. Thank you to all the entrants for their time and effort to continually working to improve McWane employees’ working conditions. Thank you again to the judges who provided such positive feedback on both the individual projects as well as the overall ergonomic program that McWane companies have built. And one final congratulations to the winners.

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