The process manual valve has internal leakage
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Process manual valves develop internal leakage after being used for a while. Why?
Internal leakage is a common problem with process valves, caused by quality issues with the valves or inappropriate valve selection.
We have seen this happen quite frequently in recent years – it involves gate valves, as well as new types of valves. In particular, those manufacturers that were once well-known for producing high-quality valves; among those ranked among the top manufacturers, there have been cases in just one or two years where three valves in a row suffered from severe internal leakage (used in deaeration pipelines). Their sense of integrity is completely gone. ——I met their service provider, who lives locally; it was just frustrating… it harms the company’s image.
Valve leakage is normal; it’s more unusual for a valve not to leak
Internal leakage in valves is a common problem among all valves, and it can only be prevented through regular maintenance.
Impurities in the pipeline can also very likely cause the sealing surface to be damaged, resulting in poor sealing and internal leakage of the valve； There are many times when it has nothing to do with the quality of the valve~
Excluding human-induced factors such as high prices and low quality, the selection of products, the quality of the products themselves, any changes in the manufacturing processes used, and whether installation follows proper standards. . . . . . . . Wait, all of these can cause internal leakage.
Some valves may be counterfeited, or some large, well-known valve manufacturers, once their business grows and their production capacity becomes insufficient, have to turn to smaller factories to manufacture the valves, after which they attach their own labels to them: L
It’s not normal for valves not to leak; in our factory, eight or nine out of ten valves leak. I remember someone saying that it’s better to rely on blind flanges than on valves.
I remember some expert saying that it’s better to rely on blind flanges than on valves. Who was it that said this?
If it’s not a real seal damage. Internal leakage can be resolved simply by tightening and adjusting the valve. If it is a genuine seal damage, the best solution is of course to stop the machine, replace the seal or the valve. If it cannot be stopped/failed to stop, repair must be carried out online while under pressure; there is a certain success rate for such repairs, and even professional teams cannot guarantee a 100% successful repair. In companies with advanced technology, once online repair is successful, the valves can be opened and closed freely, and their functional performance returns to its original state.