Check valve refers to a valve that relies on the flow of the medium itself to automatically open and close the valve disc to prevent the backflow of the medium. The check valve is an automatic valve whose main function is to prevent the backflow of the medium and prevent the pump and drive motor from reversing. and the release of container media.
Check valves may also be used on lines supplying auxiliary systems where the pressure may rise above the system pressure. The function of this type of valve is to only allow the medium to flow in one direction and prevent flow in one direction. Usually this kind of valve works automatically. Under the pressure of fluid flowing in one direction, the valve disc opens; when the fluid flows in the opposite direction, the valve disc opens.
The fluid pressure and the self-weight of the valve disc act on the valve seat to cut off the flow. Among them, check valves belong to this type of valve, which include swing check valves and lift check valves. The swing check valve has a hinge mechanism and a door-like valve disc that freely rests on the inclined seat surface.
In order to ensure that the valve disc reaches the appropriate position on the valve seat surface every time,
The valve disc is designed in the hinge mechanism so that the valve disc has enough swing space and makes the valve disc truly and comprehensively contact the valve seat. The valve flap can be made entirely of metal, or it can be inlaid with leather, rubber, or synthetic coverage on the metal, depending on the performance requirements. When the swing check valve is fully open, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The valve disc of the lift check valve is located on the sealing surface of the valve seat on the valve body.