Discussion and analysis on the high leakage rate of the propylene isolation valve

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Dear colleagues: Over the years, through continuous analysis of propylene towers, propylene spheres, and other type of valves, it has been found that propylene isolation valves have a relatively high leakage rate, and this is manifested in the following aspects: 1. After operating for a certain period of time, these valves begin to experience internal leakage. 2. After replacing with a new valve, there is no leakage in the initial stage; however, as the operating period lengthens, leakage begins to occur. 3. Try not to operate the valve, as the risk of leakage is relatively high after operation. 4. Carbon steel and stainless steel materials have no impact on the leakage rate. 5. Globe valves are slightly better than gate valves, but they can also experience internal leakage. 6. Individuals suspect a connection with the acrylic medium, but there is no theoretical support for this. I hope the experienced sailors out there can give me some advice. Thank you