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Consisting of 2 discs attached to the valve body by a pin and operated by the action of springs, which immediately start closing the valve, when the fluid stops, dual plate check valves are used to prevent back flow and also work as a prevention for water hammer.
Dual Plate Check Valves are made from a wide range materials including cast iron, special stainless steels, ect. They can be soft seat or metal seat construction and also have the ability to adjust the spring torque according to the application, which makes it a product suitable for general and special purposes.

Features of Dual Plate Check Valve:

1. Patented retainer-less design – High integrity sealing, facilitates quick disassembly at site;
2. Two independent seats – Consistent sealing even in uneven flow;
3. Raised profile of the soft seat enhances sealing;
4. Integrally moulded liner;
5. Stopper pin prevents the discs from coming into contact with each other and thus prevents disc damage. The stopper pin also prevents spring failure by ensuring that the discs don’t travel beyond the full-open position;
6. For sizes 6” and above, lifting eyebolt option is provided;
7. Drain connections provided on demand

Material of Dual Plate Check Valve:

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How does a Wafer Swing Check Valve work?

The valve’s wafer-like profile makes it a great choice for systems requiring short takeout lengths. Wafer check valves work much in the same way as swing check valves. Like swing check valves, wafer check valves are comprised of a disc and a seating arrangement. When material flows in one direction, the flow lifts the disc from the seating arrangement. This allows the material to flow through the valve. If and when flow reverses direction through the valve, the flow of material pushes the disc back into the seating arrangement, thus closing the valve off from the flow of material.
Wafer check valves are designed to be slim and unlikely to clog. This design makes them ideal for use with materials containing solid particles or debris. This type of valve can be mounted either vertically or horizontally, as long as the back pressure required to seat the check valve is sufficient. Mechanisms are available to help provide assist valves in case back pressure is insufficient.

Applications of Wafer Swing Check Valve

• Steam
• Hot & Cold Water
• Power & Heat Engineering
• Pressurized Air
• Industrial Technologies
• Fluids without Acidity or Alkalinity Properties

Advantages of Wafer Swing Check Valve

• Minimizes piping support with the compact wafer-style body. This range of wafer check valves is two to three times lighter than traditional full-bodied check valves.
• To meet special applications and service conditions, These valves can be offered with many different options, such as silicone-free cleaning, oxygen-cleaning, vertical service, left-hand operation, levers, weights, and cushions.
• For media containing fibrous matter or caustics, These offer an external spring that eliminates the spring from the flow path. This will prohibit the possibility of fiber wrapping around the spring or a chemical attack on the spring.
• Maintenance is minimal with the field-replaceable O-ring seat, available in all styles and sizes.

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What is a Wafer Dual Plate Check Valve?

The dual plate check valve is an all-purpose non-return valve that is much stronger, lighter in weight, and smaller in size compared to a conventional swing check valve or lift check valve.

The dual plate check valve employs two spring-loaded plates hinged on a central hinge pin. When the flow decreases, the plates close by torsion spring action without requiring reverse flow.

The structure of ZECO wafer dual plate check valve is that the disc is along the pin at the center position of the body to swing, short structure dimensions, and small volume. Light in weight, good process performance, quickly open and close. Small water-hammer pressure, shorter travel, small closed-impact pressure, In the horizontal or vertical pipe can be used, even easy installation. The internal design of ZECO wafer dual plate check valve minimizes the water hammer problem, it can also significantly improve the flow efficiency which is important for large size piping system. For larger O.D. piping systems, 36” and above, the dual-plate design is recommended and preferred. The wafer dual plate check valve design should also be considered for smaller O.D. piping systems where swing check valves have demonstrated flow-related problems. ZECO dual plate check valve has a short face-to-face dimension and the weight is only about 25% that of a comparable size swing check valve.

Design Standard of Dual Plate Wafer Check Valve

Features of Wafer Dual Plate Check Valve

• ZECO wafer dual plate check valve bodies are a one-piece and short cylinder design with no holes through the body wall, there is no need for external pins or plugs, and no leakage toward the outside. For critical service applications, such as hazardous or poisonous medium, this is a superior choice to minimize unwanted leakage to the atmosphere;
• Two high torsion springs of ZECO wafer dual plate check valve ensure valve closure as quickly as possible, and reduces water hammer, so as to extend valve life and improve system performance;
• A body slot of ZECO wafer dual plate check valve with carefully calculated clearance is designed to fit the hinge pin and allows the hinge pin to move in the only direction of flow. The design eliminates the possibility of friction caused by the heel of the dual plate;
• The integral cast bumper on the back of the dual plate is an effective design to prevent frequent hitting and reduces the pressing from the dual plate against the stop pin when the valve is fully opened, This extends the service life of the valve and minimizes maintenance cost.
• Low-Pressure Drop (High Cv)
  • Dual plate wafer check valves have a larger open area than other designs, thus reducing pressure drop compared to swing, lift, or other check valves.
• Light Weight
  • Reduces weight by 80–90% compared to conventional flanged check valves.
• Lower Cost
  • Lightweight, compact profiles and the elimination of flanges allow dual plate check valves to be manufactured more economically than other designs, especially as pipe diameters increase.
• Alleviates Water Hammer
  • Our spring-activated discs are designed to close our valves quickly. This assures high performance, eliminating chatter and creating dynamic responsiveness in a non-slam design.
• Simple Installation
  • Easier to install, remove and replace in both new and existing piping systems.

Applications of Dual Plate Wafer Check Valve

Dual plate check valves are applicable for air, gas, liquids, and vapors. Our facilities are kept neat, clean, and organized, with attention to detail that makes a difference in the quality of ANSI dual plate valve manufacturing.

Material of Wafer Dual Plate Check Valve

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What is NRV Wafer Type?

ZECO wafer type NRV has a shorter face-to-face dimension and dual plate design, the end connection options include wafer type, lug type and double-flange type, and are available in size from 2″ to 60″ and in pressure ratings from ASME class 150 through 2500. A wide range of body and trim materials are optional on customer’s request. Compared to conventional swing check valves, ZECO’s wafer type NRV have the advantage of zero leakage toward outside (no bolted or threaded connections), cost savings, they can be installed in any line orientation, superior seal performance, offer minimal line shock, lower pressure loss and zero seat wear.

NRV Wafer Types

SINGLE DISC CHECK VALVE

Light weight, versatile design – 80% to 90% less than conventional full-body swing check valves Single Disc opening, Single integrated arm/ disc assembly, Spring-loaded disc calculated to increase the responsiveness of the disc, Elastomer o-ring seat secured in body with dove-tail groove, Integrated body seat, Non-blow out shaft design. Optimizes space utilization, Lowers installation costs, Reduces pipe supports, Requires less number of man-hours, Unobstructed flow Stable disc at lower flow velocities, No shearing of disc from arm, Non-rotating disc for longer life.

NON SLAM CHECK VALVE

Disc Check Valve is advanced designs which gives full flow and occupy very less space than other type of Non Return Valve. DCVs are simple to fit between two pipe flanges. Spring loaded disc to prevent reverse flow in pipe lines. Stronger, lighter and smaller than conventional swing check valves, hence less expensive to install and maintain. Compact Design of valves flexibly accommodates various types of flange selection. The valves can be fitted in any direction in pipelines. Zero leakage for soft seated valves.

DUAL PLATE CHECK VALVE

The dual Plate Check Valve is an all purpose non return valve that is much stronger, lighter in weight and smaller in size compared to a conventional swing check valve or life check valve. Dual Plate Check Valve has cylindrical body which makes the valve look like any other pipe fitting. A cylindrical body has much more uniform distribution of stress compared to a conventional swing check valve. A cylindrical body of the pressure containing part of the Dual Plate Check Valve can be designed to withstand extreme much to the weight (thickness) of valve. Thus for severe/ rugged loading conditions, these valves have a distinct edge over the conventional valves both in terms of safety and economics besides general versatility. The Dual Plate Check Valve employs two spring-loaded plates hinged on a central hinge pin. When the flow decreases, the plates close by torsion spring action without requiring reverse flow. This design offers the twin advantages of No Water Hammer and Non Slam simultaneously. All features put together make the Dual Plate Check Valve one of the most efficient design. Dual Plat Check Valves are available in wafer design, flanged wafer design and extended design with flanged ends having face to face dimensions as that of a swing check valve.

How does a Wafer Type NRV work?

A wafer-type non-return valve operates based on pressure differential. This is a difference in pressure between the inlet and outlet ports of the wafer-type NRV. The valve disc opens when the inlet pressure is more than the outlet pressure. This pressure provides the force needed to flap the valve discs. When the discs are flapped they leave space for the fluid to flow through the valve. The discs remain open provided there is high suction pressure than the outlet side. When the suction pressure reduces or fluid attempts to reverse flow, the spring gains energy to revert the valve plates to their seating position thus helping in preventing reverse fluid flow.

Features of Wafer Type NRV

• The dual plate design of ZECO wafer type NRV incorporates an internal retention fitting. The fitting does not encroach the gasket sealing surface, to ensure the effective seal between valve and pipeline;
• The dual plate wafer design of ZECO wafer type NRV makes this check valve lighter, which is only 10~25% of the weight of conventional swing check valve, to saves money in initial valve cost and provides lower installation cost;
• The spring feature of ZECO wafer type NRV aids in keeping the valve closed and the lighter weight in eliminating pipeline bending loads make the valve flexible installed in any position, to allow you to design your piping layout in the most efficient and least expensive method;
• When the valve opens, the heel of the dual plate is lifted in the direction of the flow, to avoid that the heel drag across the seating surface and cause wear. When closing the valve, both the two high torsion springs and the back pressure will force disc toe and heel back in turn to the flat seat to complete the seal.
• Wafer-type non-return valves operate on their own without the use of a handwheel or valve actuator.
• These valves do not allow reverse fluid flow. The fluid flows in the forward direction and any attempt to reverse is restricted as the valve closes immediately.
• These valves have high efficiency relative to other valves because their pressure drop is minimal.
• Wafer-type non-return valves are designed to maintain working fluid pressure.
• Wafer-type NRV is versatile as they are used in various applications from household to industrial applications.
• These valves are easy to install, repair, and clean.
• They are free from fluid leakage.
• Wafer-type non-return valves alleviate water hammer and related effects.
• They are light in weight relative to other non-return valves.
• These valves are can be installed in either horizontal or vertical positions since they do not depend only on gravity to prevent reverse fluid flow.
• Wafer type NRV are fasting acting relative to other valves such as globe valves.

Applications of Wafer Type NRV

• Steam
• Hot & cold water
• Power & heat engineering
• Pressurized Air
• Industrial technologies
• Fluids without acidity or alkalinity properties

Specification of NRV Wafer Type

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