Check valve refers to the valve that automatically opens and closes the disc depending on the flow of the medium itself to prevent medium backflow, also known as check valve, one-way valve, counterflow valve, and back pressure valve. Check valve is an automatic valve. Its main function is to prevent medium backflow, reverse pump and drive motor, and release of container medium.

Check valve

Check Valve Structural Chart

Working Principle of Check Valve

Pressure test method of check valve:

Check valve test status: lift check valve disc axis is perpendicular to the horizontal position; swing check valve channel axis and disc axis are approximately parallel to the horizontal position.

In the strength test, the test medium is introduced from the inlet end to the specified value, and the other end is closed to see that the valve body and cover are qualified without leakage.

Sealability test introduces test medium from the outlet, and inspects the sealing surface at the import end. No leakage at the filler and gasket is qualified.