Introduction to check valves
Release time:
2025-04-28
Check valves, also known as one-way valves or check valves, its role is to prevent
Check valves, also known as one-way valves or check valves, its role is to prevent the backflow of media in the pipeline. Including swing check valve and lift check valve. Swing check valve has a hinge mechanism, there is a door like valve flap free against the inclined surface of the valve seat. In order to ensure that the valve flap reaches the proper position on the seat surface every time, the valve flap is designed in a hinged mechanism so that the valve flap has enough room to rotate and so that the valve flap has true, full contact with the seat. The valve flap can be made entirely of metal, or leather, rubber, or synthetic coverings can be inlaid into the metal, depending on the performance requirements. Swing-open check valves are virtually unimpeded by fluid pressure in the fully open condition, so the pressure drop through the valve is relatively small. The flap of a lift check valve is seated on the seat sealing surface on the valve body. The rest of the valve is like a globe valve except that the flapper can be raised and lowered freely. Fluid pressure causes the flapper to lift from the seat sealing surface, and the return flow of the medium causes the flapper to fall back to the seat and cuts off the flow. Depending on the conditions of use, the valve flap can be an all-metal structure, or in the form of a rubber gasket or rubber ring inlaid in the valve frame. Like globe valves, the passage of fluid through a lift check valve is narrow, so the pressure drop through a lift check valve is somewhat greater than that of a swing check valve, and the flow rate of a swing check valve is subject to few restrictions.
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