What is a check valve?

A check valve is a valve that can automatically prevent the backflow of liquid. The valve disc of the check valve opens under the action of fluid pressure, and fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the valve disc automatically closes the valve under the pressure difference of the fluid before and after the pipeline valve, its own gravity, or the action of the spring, to prevent liquid from flowing back in the pipeline.The main check valve product names of China Check Valve Network include:Chute Rolling-ball Check Valve，Flange Swing Rubber Disc Check Valve，Oversized Silent Check Valve，Flange Ball Check Valve，Wafer Double Disc Butterfly Check Valve，Flange Lift Copper Check Valve，No-load Running Check Valve，Flange Jacket Insluation Check Valve

Main structural characteristics of check valves: Check valves are mainly composed of valve body, valve disc, valve stem, spring and other parts. The valve disc needs to have sufficient strength and stiffness, and the sealing surface of the valve disc can be welded with metal material or embedded with non-metal material according to user requirements; Valve disc limit device, to prevent the valve disc from opening too high and becoming stuck and unable to close; Large caliber check valves are designed with lifting rings on the valve cover for easy lifting during transportation and installation.

The valve disc of the swing check valve rotates around the axis of rotation. Its fluid resistance is generally lower than that of lift check valves, making it suitable for larger diameter applications.

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