Check Valves

Check valves are mechanical valves that permit gases or liquids to flow in only one direction, preventing flow from reversing down the line. They are classified as one-way directional valves. Fluid flow in the desired direction opens the valve, while backflow forces the check valve to close.

Most check valves contain a flat disc that is slightly larger in diameter than that of the port. Flow indicators on the side of the body indicate the direction of the flow for correct installation.

See also Spring Check Valves, Swing Check Valves, and Lift Check Valves.

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