Wafer check valve is a kind of check valve. Check valve refers to the valve that automatically opens and closes the valve disc depending on the flow of the medium itself to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve and back pressure valve. The check valve belongs to an automatic valve, which is mainly used to prevent medium backflow, reverse rotation of pump and driving motor, and discharge of container medium. The check valve can also be used on the pipeline to supply the auxiliary system in which the pressure may rise above the system pressure.
The wafer check valve has the advantages of light weight, small volume and easy installation between flanges. The inside of the valve is composed of two semicircular springs and plate surface, which are fixed on the valve body with pins. The spring deformation closes the valve plate, and the fluid pressure opens it. The spring deformation is very fast, which can protect the pipeline from water hammer damage.
Precautions for installation of wafer check valve:
1. When placing the pipeline, pay attention to make the passing direction of the wafer check valve consistent with the fluid flow direction;
2. It shall be installed in the vertically placed pipeline. For the horizontally placed pipeline, the wafer check valve shall be vertically placed;
3. Use an expansion pipe between the wafer check valve and the butterfly valve. Never connect it directly with other valves;
4. Avoid adding pipe joints and obstructions within the operating radius of the valve plate;
5. Do not install a reducer in front of or behind the wafer check valve;
6. When installing the wafer check valve near the elbow, pay attention to leave enough space;
7. When the wafer check valve is installed at the outlet of the water pump, at least six times the valve diameter shall flow out to ensure that the butterfly plate is affected by fluid.
