What Is the Function of a Hydraulic Check Valve?

by Kevin Boone

Check valves are a form of directional valves--they direct the flow of hydraulic fluid through a hydraulic line or hose. Check valves are used where misdirected fluid flow can damage or destroy equipment or cause a safety issue.

How They Work

Hydraulic check valves mechanisms usually consist of a spring, ball and seal; the mechanism activates when the fluid pressure pushes the spring open. When fluid flow is reversed, the force pushes the ball against the seal, preventing the flow of the fluid.

Direction Control

Hydraulic check valves permit fluid to flow one way. They prevent the reverse flow of hydraulic fluid. An arrow on the valve indicates the fluid flow.

Pressure Control

Hydraulic check valves can also control the fluid pressure within a hydraulic line. The pressure is regulated by the spring tension in the mechanism.

About the Author

Kevin Boone is a current student at Chattanooga College and graduated from Pellissippi State in 2000 with an associate degree in electrical engineering. He has written safety-related procedures and documents for organizing power system components and holds his A+ Certification for Computers.