High-pressure-maintaining overflow valve

Abstract

The invention relates to the technical field of high-pressure cleaning machines, in particular to a high-pressure-maintaining overflow valve which comprises a pump cover with an overflow channel, the overflow valve is arranged in the overflow channel, and the overflow valve comprises an overflow valve element, an overflow spring, an overflow valve seat, a steel ball, a push rod and a pressure maintaining valve. The pressure maintaining valve comprises a pressure maintaining valve seat, a pressure maintaining valve cover, a pressure maintaining valve element, a pressure maintaining spring and a pressure maintaining sealing ring, the other end of the push rod is fixed to one end of the pressure maintaining valve seat, the pressure maintaining valve cover is fixed to the other end of the pressure maintaining valve seat, the pressure maintaining sealing ring is arranged between the pressure maintaining valve cover and the pressure maintaining valve seat, and a pressure maintaining cavity is formed between the pressure maintaining valve cover and the pressure maintaining valve seat; a connecting hole is further formed in the pressure maintaining valve seat, the pressure maintaining valve element is arranged in the pressure maintaining cavity, a groove is formed in the front end of the pressure maintaining valve element, the pressure maintaining valve element is matched with the pressure maintaining sealing ring, the motion stroke of the high pressure maintaining overflow valve is small and definite, the service life of parts is long, and the ejector rod is easily ejected open in the gun closing and recoil state.

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