Stress calculation at the moment of opening of low-temperature direct load safety valve

Abstract The safety valve is an automatically opening valve commonly used in pressure equipment. When the medium pressure exceeds the design pressure, the safety valve will automatically trip to protect the pressure equipment. The working state of a safety valve is related to the physical properties of the medium it carries, especially the temperature of the medium and the fluid jet at the moment of opening the safety valve. This article uses fluid structure coupling to analyse the velocity field of the safety valve nozzle and the density and medium field to provide the changes in pressure and spring force during the safety valve jumping process, providing theoretical guidance for the revision of the set pressure value for low-temperature safety valve calibration.