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What does A Check valve do ?

What does A Check valve do ?


A check valve restricts the flow of a liquid or gas in a piping system to one direction.

A swing check valve or tilting disc check valve is check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the center-line between the two ports or at an angle. Although swing check valves can come in various sizes, large check valves are often swing check valves.

 

A lift-check valve is a check valve in which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side.

 

A stop-check valve is a check valve with override control to stop flow regardless of flow direction or pressure. In addition to closing in response to back flow or insufficient forward pressure (normal check-valve behavior), it can also be deliberately shut by an external mechanism, thereby preventing any flow regardless of forward pressure

 

A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a spherical ball. In some ball check valves, the ball is spring-loaded to help keep it shut.

 

 

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