A kind of pneumatic control pressure relief valve and pressure relief method

Abstract

The invention discloses a pneumatically controlled pressure relief valve and a pressure relief method. The pressure relief valve comprises a valve body, a valve element, a valve seat and a cylinder block, wherein the left end of the valve body is fixedly connected with the cylinder block; the right end of the valve body is connected with the one-way valve; a piston is mounted in the cylinder block and is fixedly connected with the left end of a push rod; the right end of the push rod is inserted in a middle through hole of a main screw seat; the right end of the main screw seat is fixed on the valve body; a middle through hole is formed in the valve seat; the valve element is arranged in the middle through hole of the valve eat; the right end of the push rod can move rightwards and penetrates through the middle through hole of the main screw seat to drive the valve element to move; a compressed air inlet and a valve internal gas outlet are formed in the cylinder block; the compressed air inlet communicates with the left end of the piston; and the valve internal gas outlet communicates with the right end of the piston and a cavity between the main screw seat and the left end of the valve body. The pressure relief valve can guarantee that after pressure withstanding test of a pressure vessel, residual deformation rate of measurement volume meets requirements of slow pressure relief.

Description

technical field [0001] The invention relates to an air-controlled pressure relief valve and a pressure relief method, which are suitable for use when the residual deformation rate of the measured volume after a pressure-resistant test of a pressure vessel needs to be slowly relieved, and are especially suitable for pressure relief during a hydraulic test of a high-pressure vessel. field of hydraulic technology. Background technique [0002] With the widespread use of compressed gas, the use of pressure vessels is also increasing. For the sake of safety, the country has clear standards and specifications for the testing and testing methods of pressure vessels. In recent years, the use of compressed natural gas for vehicles has been increasing day by day, and corresponding standards have been formulated for the hydraulic test methods of compressed natural gas cylinders for vehicles. Among them, it is clearly stipulated that there is a process of boosting pressure-holding pre...

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