The non-slam check valve is a kind of automatic valve, its main function is to prevent the back flow of the medium, prevent the pump and drive motor from reversing, and discharge the container medium. The check valve can also be used to supply the auxiliary system whose pressure may rise above the system pressure. Check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
The function of the check valve is to only allow the medium to flow in one direction and prevent the flow in the opposite direction. Usually this kind of valve works automatically. Under the action of the fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the fluid pressure and the self-coincidence of the valve flap act on the valve seat, thereby cutting off the flow.
Common faults of check valves include:
①The valve disc is broken;
②The medium flows back.
1. Reasons for the disc breaking
The pressure of the medium before and after the non-slam check valve is close to balance and they are in a state of "seeing" each other. The valve disc often beats against the valve seat, and the disc made of some brittle materials (such as cast iron, brass) is broken. The preventive method is to use a check valve whose disc is a flexible material.
2. The reason for the backflow of the medium is the damage of the sealing surface or the inclusion of impurities. After repairing the sealing surface and cleaning impurities, backflow can be prevented.
ZhengFeng Valve Group is a professional valve manufacturer. For each spring in the non-slam check valve, we use a caliper to measure the geometric size, and use a spring tester to test the load force to ensure that the check valve is opened and closed in a normal state. Because of this, ZhengFeng's check valve feedback in the market is excellent.