Brief introduction:The check valve is also known as counter current valve, PVC Safety Valve, PVC Back Pressure Valve, PVC Check Valve. This kind of valve is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, which belongs to a kind of automatic valve.
Check valve is to point to the valve relying on the flow of medium itself and automatically open, close valve valve, used to prevent medium back flow, also known as check valve, one-way valve, counter-current valve, and back pressure valve. Plastic Check Valve is an automatic valve, its main function is to prevent the back flow of the medium, prevent the pump and drive motor reversal, and the discharge of the vessel medium. Check valves can also be used to supply lines in which pressure may rise to exceed the auxiliary system pressure. Ball Check Valve can be mainly divided into rotary start type check valve (rotating according to the center of gravity) and lifting type check valve (moving along the axis).
Operational principle:This type of valve functions to allow the medium to flow in one direction and prevent flow in the opposite direction. Usually the valve works automatically and opens the valve disc under a directional flowing fluid pressure; During the fluid flow in the opposite direction, the fluid pressure and the valve disc stop on the valve seat to cut off the flow.
The stainless steel pair of clip type check valve belongs to this type of valve, it includes rotary start type check valve and lift type check valve. The Swing Check Valve has a single hinge mechanism, and a door-like flap that is free of leaning against the surface of the tilted valve seat. To ensure that the flap reaches the proper position on the seat face each time, the flap is designed at the hinge mechanism so that the flap has sufficient room for rotation and makes true and full contact with the seat. The flap can be either made all out of metal, or inlaid with leather, rubber, or with a synthetic covering, depending on the performance requirements. When the PVC Swing Check Valve is fully open, the fluid pressure is almost unimpeded, so the pressure drop passing through the valve is relatively small. The valve seat of the lift check is located on the seat sealing face on the body. This valve is the rest of the valve, like the stop valve, the fluid pressure raises the valve flap from the valve seat sealing surface, the medium reflux causes the valve flap to fall back to the valve seat, and cut off the flow. Depending on the conditions of use, the flap can be an all-metal structure or in the form of a rubber pad or rubber ring inlaid on the valve holder. Like the stop valve, the fluid flow through the lift check valve is narrow, so the pressure drop through the lift check valve is larger than the lift check valve, and the flow of the lift check valve is rarely limited.