Experimental analysis of the effect of sealing surface pitting defects on valve sealing performance

Abstract

A significant element impacting sealing performance is the existence of defects on the valve plate's sealing surface. On plates without defects, we run a static sealing test. On the five wedge gate valve plates with pit defects created on the sealing surface, we performed static sealing tests, sealing tests with switching, and thermal fatigue sealing tests. According to experimental findings, isolated pit defects, dense defects, and dispersed defects do not cause valve plate leakage to exceed JB/T8858 standards. There is no substantial correlation between media pressure, switching rates, and leakage rates. Wedge gate valve leakage rate dramatically increased during thermal fatigue conditions, and sealing performance and the number of valve switches under high pressure conditions are positively associated, with the higher the switching rate, the higher the leakage rate.