The check valve is a valve that automatically opens and close valve discs depending on the flow of the medium itself, and it is also used to prevent the backflow of the medium. It is also called the check valve, counterflow valve and back pressure valve. Check valve is a kind of automatic valve, and its main function is to prevent the reverse flow of the medium, prevent the reversal of the pump and drive motor, and the discharge of the container medium.
Test pressure method of check valve
The test condition of the check valve is that the lifting valve is located at the horizontal vertical position, and the axis of the swing check valve and the valve lobe axis are approximately parallel to the horizontal line.
During the strength test, the test medium is introduced from the inlet to the specified value, the other end is closed, and the valve and the valve cover are not qualified for leakage.
The sealing test introduces the test medium from the outlet, and checks the sealing surface at the inlet. There is no leakage at the filler and gasket at the entrance.