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How the check valve works
May 28, 2018

Check valves can also be used on pipelines where the pressure may rise above the system pressure to provide supplemental systems. Check valve can be divided into swing check valve (rotation by gravity center) and lift check valve (move along axis).

The function of this type of check valve is to allow only medium to flow in one direction and to prevent reverse flow. Normally, this type of valve operates automatically. The valve flap is opened by the fluid pressure flowing in one direction. When the fluid flows in the opposite direction, the fluid pressure and the self-closing flap of the valve flap act on the valve seat to shut off the flow.

The check valve belongs to this type of valve, which includes a swing check valve and a lift check valve. The swing check valve has a hinge mechanism, and a flap like a door leans against the inclined seat surface. In order to ensure that the valve flap can reach the proper position of the valve seat face each time, the flap is designed in the hinge mechanism so that the valve flap has sufficient swirling space and the valve flap is in true and full contact with the valve seat. The flaps can be made entirely of metal. They can also be inlaid with leather, rubber, or synthetic coverings, depending on the performance requirements. Swing check valves In the fully open condition, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The valve of the lift check valve seats on the valve seat sealing surface on the valve body. In addition to the valve flap can be freely raised and lowered, the rest as the stop valve, the fluid pressure to lift the valve flap from the valve seat sealing surface, the media back to cause the valve flap fall back to the valve seat, and cut off the flow. Depending on the conditions of use, the valve flap may be of a fully metal construction, or it may be in the form of a rubber gasket or rubber ring embedded in the valve holder. Like the shutoff valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than the swing check valve, and the flow of the swing check valve is limited Very little