A swing check valve is a type of check valve designed to allow the flow of fluid in one direction while preventing backflow in the opposite direction. It is called a "swing" check valve because of the swinging motion of the disc or flap within the valve body.

Valves provide several functions. Like, the valve can control the material staring in or stopping out. It also can regulating flow and pressure within the piping system. The direction of the flow also can be controlled under the pipe system. The rate of the throttling flow also can be managed. Improving safety through relieving pressure or vacuum in a piping system.