Difference between slam and non slam check valve

You may not be aware of a non-slam nozzle type check valve. Non slam High integrity valves - Valve engineeringpostsJun 2013Valve Selection criteria for Non Slam Check Valve. Dec 2012Tilting Disc Check vs Swing Check Valve - Valve.

A traditional swing check valve requires gravity and flow reversal to fully close. Another way to prevent water hammer is to seek out a check valve with non-slam features. The Non-slam check valve can be equipped with a counterweight and may have an optional hydraulic damper cylinder with an unidirectional oil flow metering . In applications where forward flow can very quickly turn into reverse flow, ie high system decelerations, non-slam check valves are essential.

Non-slam check valve succeeds by keeping it simple. Water hammer is a common problem in supply systems whenever the steady state condition of the flow is . Non slam check valves are used in gas or liquid duty were every attempt must be made to prevent pressure waves caused by the slamming of a disk or flapper . Duo-Chek high performance non-slam check valves are the original Mission Manufacturing Company wafer check valves introduced to the market in the late . Wafer style, inserted between mating flanges with studs. Mar 20- When it is in fully open position, the net area between the seating disk.

The hardness difference can also be achieved by weld deposit on seating surfaces. The non-slam check non return valve is a spring-loaded lift check .