Non slam check valves are used in gas or liquid duty where every attempt must be made to prevent pressure waves caused by the slamming of a disk or flapper during reverse flow, this is normally achieved by having a conical in line piston which enables a smooth flow stream for the medium.
A check valve, clack valve, non-return valve orone-way valve is a mechanical device, a valve, which normally allows fluid (liquid or gas) to flow through it in only one direction.
There are various types of check valves (wafer,piston, swing, SSIV) used in a wide variety of applications. Check valves are often part of common household items (flapper) up to major gas pipeline subsea check valves (SSIV), which maintain the safety and integrity of refineries and offshore platforms. There for they are available in a wide range of sizes and costs. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. They are often part of a safety system (SSIV) or pump protection to stop reverse flow (swing check).
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