Realization of pressure steady control for an automatic hydraulic pressure testing system based on proportional pressure reducing valve

An automatic hydraulic pressure testing system is used to conduct explosion tests on vessel subjects. Such a testing system is able to output continuous hydraulic pressure from 0.5MPa to 250MPa. However, there is a periodic pressure ripple, approximately 3MPa in value, in the output when the system outputs pressure from 25MPa to 250MPa. Regarding this problem, this paper analyzes probable causes and proposes a simple solution based on proportional pressure reducing valve (PPRV). Control models are built in Simulink, and stability of pressure control is analyzed. Hardware and software are updated for the testing system. Tests show that pressure control error of the improved system is 1% of full range of output pressure. This method of pressure steady control is simple and easy to achieve, and it shows good steady control results. Overall, it is a good reference to similar situations in engineering practice.