CB/T3819-2013 Plate check valve 

    Marine Check Valve refers to the valve whose opening and closing parts are circular discs, which block the backflow of the medium by its own weight and medium pressure. It is an automatic valve, also known as Stop Valve, check valve, return valve or isolation valve. The movement mode of the disc is divided into lift type and swing type. The structure of the lift check valve is similar to that of the globe valve, except that the valve stem that drives the disc is missing. The medium flows in from the inlet side (lower side) and out from the outlet side (upper side). When the inlet pressure is greater than the sum of disc weight and its flow resistance, Marine Valve opens. Conversely, when the medium flows backwards, the valve is closed. Swing check valves have an inclined disc that can rotate around an axis. Its working principle is similar to that of lift check valve. The check valve is often used as the bottom valve of the pumping device to prevent the backflow of wate…