1, principle: check valve refers to the valve that automatically opens and closes the disc depending on the flow of the medium itself to prevent the medium from flowing backwards, also known as check valve, check valve, reverse flow valve and back pressure valve. Check valve is an automatic valve, its main function is to prevent the medium from flowing backwards, prevent the pump and driving motor from reversing, and release the medium in the container. Check valves can also be used in pipes supplying water to auxiliary systems, in which the pressure may rise above the system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lifting check valves (moving along the axis).
The function of check valve is to only allow the medium to flow in one direction and prevent it from flowing in the opposite direction. Usually, this valve works automatically. Under the action of unidirectional fluid pressure, the disc opens. When the fluid flows in the opposite direction, the fluid pressure and the self-overlapping disc of the disc act on the valve seat, thus cutting off the flow.
2. Function: It is mainly used in pipelines where the medium flows in one direction, allowing the medium to flow in only one direction to prevent accidents.