Silent check valve refers to the valve that automatically opens and closes the valve flap relying on the flow of the medium itself to prevent the backflow of the medium, also known as check valve, check valve, silent check valve counterflow valve, and back pressure valve. The check valve is an automatic valve whose main function is to prevent the backflow of the medium, prevent the reversal of the pump and the drive motor, and the discharge of the container medium. The check valve can also be used to feed the auxiliary system where the pressure may rise above the system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).

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