For high-pressure piping systems where multiple pumps are used together, the problem of water hammer in the piping system is even more acute.

Water hammer is a pressure wave of the ever-changing flow in a pressure pipe, which is a hydraulic shock caused by a pressure rise or fall due to the change in the fluid flow rate in the pressure pipe.

Water hammer is the combined result of the incompressibility of the fluid, the inertia of the fluid motion and the elasticity of the pipe.

In order to prevent the potential danger of water hammer in the pipelines, over the years, researchers use certain new structures, new materials in the design of the check valve. While ensuring the applicable performance of the check valve, the creative endeavor has made gratifying progress in reducing the impact force of the water hammer

Check valve is a valve that relies on the flow of the medium itself to automatically opens and closes the valve plate. It is used to prevent the back-flow of the medium, so it is also known as non-return valve, uni-direction valve.

Check valve is an automatic valve, its primary function is to prevent the media back-flow, prevent the pump and drive motor from reversing, as well as the leakage of container media.

Check valve can be divided into swing check valve and lift type check valve.