Wafer Check Valve (3″ – 12″)
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Check Valves

Wafer Check Valve (3″ – 12″)

Wafer check valves have a solid thermoplastic body with a very thin “wafer” profile that makes them an ideal check valve for applications that require valves with short takeout lengths. Similar in operation to a swing check valve, the wafer check has a solid thermoplastic disc and seat arrangement that performs the check action. In one direction, fluid lifts the disc off of the seat and allows fluid to pass freely. In the opposite direction fluid drives the disc into the seat, creating a seal and preventing fluid from back flowing upstream. Because of its slim profile, wafer style checks are unlikely to clog, which makes them ideal for service lines with large debris or solids. Wafer check valves are used in applications where it is essential to ensure fluid flow passes in only one direction. Wafer check valves can be mounted in vertical or horizontal directions, with the only restriction being a minimum back-pressure required to properly seat the check valve. Spring assists and lever and weight mechanisms are available options to assist in closing the valve quicker to reduce water hammer concerns.

Resources:

Data Sheet

Ideal Applications Include:

Tank inlets/outlets, preventing backflow into a pump, one-way mixing, water hammer mitigation, pressure balancing, process intakes.

In the following industries: chemical processing, bleach plants, aquariums, mining, water treatment, landfills, swimming pools, power plants

Specifications:

Sizes:

3” – 12”

Models:

Wafer style ANSI

Bodies:

PVC

Seals:

EPDM or FKM

  • All 3″ – 8″ wafer check valves operate at a maximum pressure of 150psi, 10″ and 12″ valves at 90psi and up to 120° F
  • PVC body with EPDM or FKM seals
  • Slim profile permits easy installation
  • Wafer style fits between two-mating flanges
  • Face-to-face meets ASME/ANSI B16.10
  • No spacer required
  • No pipe interference with disc
  • No bolt pattern: permits installation using ANSI/JIS/DIN mating flanges
  • Vertical or horizontal installation
  • No external shaft
  • Excellent chemical resistance
  • Stainless steel external spring assist (ECTFE coated in 316 stainless steel) for 4″ – 12″ wafer check valves

    • Wafer check valves have the option to install a spring assist mechanism in the valve. This spring can be made from either 316 stainless steel or 316 stainless steel with a coating of PTFE for additional chemical resistance. When fluid pressure starts to drop, the spring pushes the ball back into the seat before the fluid stops and reverses direction. This will reduce the speed of the fluid flowing back towards the check valve, minimizing the shock caused by water hammer. The spring assist assembly does not accommodate sealing. Hence, the minimum backpressure requirements still apply for wafer check valves with spring assist assemblies.