Swing check valves use a flapper or disk on a hinge in the body, as flow goes through the valve the disk moves away from the sear and allows the liquid or gas to pass. When back flow is experienced the disk moves back onto the seat and is sealed by the pressure of 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 off shore 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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