Safety valve

The utility model relates to a safety valve, which is designed for improving the existing safety valve incapable of regulating pressure. The safety valve is composed of a hollow valve body, a valve cap which is communicated internally and is provided with an air inlet and an air outlet and a sealing mechanism which is provided with a spring and a sealing head, wherein, the sealing mechanism is composed of a shim, a sealing head, a valve core, a spring, a spring base, a pressure regulating base and a sealing. The spring is sheathed on the valve core, one end is connected with the pressure regulating base, and the other end is connected with the spring base. The spring base is limited by a convex ring on the valve core, and the pressure regulating base is connected with the valve body through screw threads. One end of the valve core is connected with the sealing head, the other end is connected with the sealing, and one side of the sealing head is connected with the sealing shim and then is connected with the air inlet. The utility model has the advantages of regulating safety presser of the safety valve through a pressure regulating screw nut and pulling the valve core through rotating the screw nut type sealing in order to discharge air and relief pressure. In addition, the sealed process can be realized through a rubber shim plane, and the sealing surface is easy in processing and reliable in sealing.