The check valve is used in the pipeline system, and its main function is to prevent the medium from flowing backward, preventing the pump and its driving motor from reversing, and releasing the medium in the container. Check valves can also be used to supply pipelines for auxiliary systems whose pressure may rise above the pressure of the main system. According to different materials, check valves can be applied to pipelines of various media. The check valve is installed on the pipeline and becomes one of the fluid parts of the complete pipeline. The opening and closing process of the valve disc is affected by the transient flow state of the system where it is located; in turn, the closing characteristic of the valve disc have an effect on fluid flow again