Experimental Research on the Dynamic Instability and Water Hammer Effect of Pressure Relief Valve

Abstract

To explore the dynamic instability characteristic of pressure relief valve, the experimental research was performed by considering the influence factors of flow rate, set pressure and inlet pipe length. Data analyses for typical chatter instability conditions are conducted. Theoretical and experimental analyses of water hammer effect during chatter instability were conducted. The results showed that the valve core hits the seat with high frequency in chatter instability. The lift, velocity and acceleration of the valve core increase with the increase of the flow rate. It is reliable to judge the water hammer pressure rise according to the closing time of valve and the transit time of reflected wave.