Thermal State Experiments And Transient Numerical Simulation Method Development Of Spring-loaded Pressure Relief Valve

The pressure relief valve (PRV) is a significant safety accessory to pressure loaded installations. It is designed to open and relieve excess pressure, and to reclose and prevent the further leaks of fluid after normal conditions have been restored. And it is widely used in nuclear power, chemical and other process industries. But it was known that the experiments on steam PRV under high pressure and high temperature are very costly. To this end, in this paper, to investigate the dynamic performance of spring-loaded pressure relief valve (PRV) under high temperature and high pressure steam (HTHPS) conditions, the detailed study is summarized as follows:(1) To get the accurate dates about the dynamic performance under HTHPS conditions, experiments according to ASME PTC 25 were carried out. And so the value of many important parameters was got from the experiments.(2) A new transient numerical simulation method considering the effects of disc components mass and the choke flow also was carried out. Base on the experimental results, the validity of accuracy of the simulation was confirmed by comparing the results of simulation and experiments for the first time. Results comparison shows that the simulation results accurate enough to be a substitute for the experimental results to some extent.(3) Base on this new transient numerical simulation method, the differences in PRV dynamic performances caused by different fluid medium, different degree of superheat, different position of adjusting ring and different spring stiffness were discussed. The simulation results not only matched the practical experience, but also that offered us the quantitative analysis for the effects of different factors. In addition to these, the transient numerical simulation method is more effective, economical and safety compared for the experimental method.