How can the leakage test of control valves be conducted in a more reliable manner?
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Everyone is probably familiar with the leakage levels for control valves, but there are various leakage test standards such as European standards, American standards, and national standards. It may seem like nothing special after reading about them, yet in practice things can become ambiguous. Could everyone please summarize a more reliable method? Please give me some advice! ! !
This issue is indeed a major one. I feel the same way when seeking help.
Actually, I saw that you have already answered similar questions before. Do you have any further insights?
The most straightforward approach is to conduct re-inspections based on the allowable leakage amounts specified in the factory reports for each valve. Of course, it’s better to communicate with foreigners regarding whether imported valves need to be tested, or how to conduct such tests.
This is also a good starting point! ! ! What’s the conventional approach? So, if the pressure difference is below 0.35, testing is carried out based on that valve’s pressure difference, while if it’s above 0.35, testing is done using a value of 0.35?
Based on the actual process requirements, what needs to be done quite carefully is pressurizing the valve (in terms of direction), either with water or gas. If water is used, check for any leaks; if gas is used, carry out foaming and apply a foaming agent to check for leaks. If it is used only for process adjustment, a certain amount of leakage is acceptable as long as it does not affect the process operation.
I can understand what you mean. By \"with adjustment,\" you are referring to a leakage level of 4; a level where no leakage occurs would be around 6. However, your description is a bit vague.
If you are working on construction documents, you need to have relevant evidence; if you are responsible for on-site construction inspection, it is best to follow the actual requirements of production.
What I want to know are the specific steps involved
It can be done in accordance with Chinese standards. Besides, what’s the use of a high leakage level at the time of manufacturing if it’s not high during use? Technically, only the leakage level is required; in practice, however, it is crucial to pay attention to aspects such as the valve design, sealing structures and materials, suppliers, and user experience.