Wafer Check Valve

What is a Wafer Check Valve?

Wafer check valves are in-line piping valves used to control fluid flow direction and reduce or fully prevent possible back flow within plumbing systems. Wafer check valves are also known as clack valves, reflux valves, non return valves and one way valves. This valve type has been engineered to automatically eliminate the fluid flow reflux that can occur whenever a process system is shutdown. These valves feature a hinged, flap-like disk (the wafer) that is used to allow and restrict liquid flow. This disk only opens in one direction and closes shut under back pressure to seal the valve against opposing fluid flow. Wafer check valves require a minimum amount of system fluid pressure to operate. The check opens whenever upstream pressure is greater than downstream pressure and closes whenever downstream pressure exceeds upstream. Thermoplastic wafer check valves are acceptable for non compressible liquid applications only and should never be used for pneumatic, gas or compressible liquid type scenarios.

Advantages of Wafer Check Valve

ZECO wafer check valve is simple in design because the wafer connection is named and consists of body, disc, spring and shaft pin components. Due to the short closing stroke of the wafer check valve and the quick closing by the spring, the impact on the water hammer can be significantly reduced. The wafer check valve can also be divided into wafer type lifting check valve, wafer type dual plate check valve and wafer type single plate check valve.

  • High strength
    • Capitalizing on the stress analysis, they relieve users of any concerns about the strength of resin-made wafer checks.
  • High corrosion resistance
    • All components contacting fluid are made of resins. In addition, springs are coated.
  • Lightweight and compact
    • Their weights are about one third to one fifth those of metal valves. With small interfaces, they facilitate piping work.
  • Cost reduction
    • No gaskets are needed when piping. With integrated stoppers, they help reduce costs.

Wafer Check Valve & Flange Check Valve, Which is better?

Wafer check valves use a swinging disc to allow or block flow. Their design allows them to be fitted in extremely tight spaces – where the flanged check valve can not be used. The wafer check valves have molded bodies around the area where the disc opens up. This is the most important difference between the above two types of valve.

While at first glance this may just seem like a space issue, the presence of a valve body as opposed to the bare bones wafer check actually makes a big difference in the functionality of the valve. Because flanged check valves are flanged in place, there isn’t much room for the disc to open in the pipe line. That means flow is often restricted within the check valve.

Wafer check valves on the contrary have a molded body that creates room for the disc to swing open fully, thus allowing full flow. As you can imagine, this is very important if your application requires full flow. For this reason, we usually offer wafer check valves for applications where flow is not an issue, and swing check valves when a full port valve is required.

Wafer Check Valve for Sale

Specifications of Wafer Check Valves

Size Range 1″ to 60″ (25mm to 1500mm)
Temperature Range Cryogenic to High Temperature (Pending Model Selected)
Maximum Allowable Operating Pressure API 594 (150, 300, 600, 900, 1500, 2500)
ASME (125, 150, 300)
PN (10, 16, 25, 40)
Shutoff Rating Zero Leakage
Body Materials ASTM A 126 CLB, ASTM A 395, ASTM A 216 WCB, ASTM A 351 CF8M, Titanium
Seat Materials BUNA-N, EPDM, A240 – 304 (Inserted or Integral), PFTE, Viton
Disc Material SS316 as standard (or Higher Grade)
Body Style Wafer, Flanged, RTJ
Design Standard API 594, ASME B16.34
Face to Face ANSI, API 594
Testing Standard API 598, ASME B16.34

When ZECO helps users to choose the wafer check valve for pipelines, it will give the corresponding scheme. The wafer check valve is usually installed in the pipeline that may produce a water hammer. Because of its structural characteristics, the wafer check valve can effectively eliminate the water hammer generated by the counterflow of medium. Another feature of the wafer check valve is that it does not need flange connection, saving installation space. It only needs to be installed in the middle of two pipe flanges, and then fixed with bolts.

ZECO Valve is specialized in the wafer check valve manufacturers and carries on the design and production strictly in accordance with API 594 standard, the size range of products made from 1/2 “to 88”, nominal pressure from 150 lb to 2500 lb. Main valve material includes carbon steel, low-temperature steel, dual-phase steel, titanium alloy, aluminum bronze, Inconel, Monel alloy and other metal materials, products widely used in oil and gas, in the field of global energy, chemical and other industries.

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