How does a check valve work?

Check valves are used to prevent the reversal of flow in a line. When open and under pressure, the checking mechanism will move freely in the media, offering very little resistance and minimal pressure drop. 

Common types are swing check valves and ball check valves.

A swing check valve utilizes a swinging disc, which requires only minimal back pressure to close the valve. This valve can also be modified, with a lever and weight or spring, to assist in seating faster to eliminate shock.

 

A ball check valve employs a free moving ball, which unseats to permit flow in one direction, but seals against a seat to prevent backflow.

Article Title:
How does a check valve work?
Article Summary:
Explanation of how a check valve works.
Article Date:
6/4/2008
Article ID:
441
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