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The automatic pressure relief valve is composed of needle valve, pressure gauge, main valve, pilot valve and connecting pipe and other components. It is a kind of hydraulic control valve. The main valve is divided into upper and lower parts by a diaphragm. The lower chamber of the diaphragm is the water flow channel, and the upper chamber is the control room, which controls the opening and closing of the main valve disc. The pilot valve itself is a pressure relief valve. It also has a control room and a water flow channel. The opening and closing of the valve disc is controlled by the control room. The needle valve, that is, the throttle valve, controls the flow of water in the connecting pipe.