SS External Spring Assist for Wafer Check Valve
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.