Pressure release valve

The utility model discloses a pressure release valve which includes a tubular housing, an air inlet positioned in one end of the housing, a sealing cap positioned at the other end of the housing and mounted on the housing in a sealing manner, and a plurality of pressure relief air outlets positioned in the side wall of the housing; the pressure relief air outlets are symmetrically arranged relative to the center shaft of the housing; seal rings are pressed tightly through the interaction between rollers and a sealing baffle plate, and a large pressing force can be formed on the seal rings, so that a good sealing effect can be played; in addition, during a repeated opening and closing process, the structure of the pressure release valve is high in stability and disorder is prevented; a piston adopts a cylindrical structure, and a sliding plate and a sliding ring are arranged at the front end and the rear end of the piston for supporting and sliding; the structure is relatively symmetrical and steady.