Under low pressure, frequent knocking sounds occur inside the valve body of parallel gate valves
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There is a pneumatic parallel gate valve (spring-type) on site; it passed a hydrostatic test when tested offline with no leaks. When the system is in operation on site, the pressure is less than 2 bar, and knocking sounds frequently occur inside the valve body, at a high frequency. This phenomenon disappears for a while but reappears later. Dear sea friends, let’s discuss together what the reasons for this phenomenon are
““Pneumatic parallel gate valve (spring-type)” – do you mean that the valve in question is actually a “butterfly check valve”? If it is a check valve, it should be the sound produced by the opening and closing of the valve disc when the flow rate fluctuates the most. It is in normal condition. During shutdown for maintenance, such valves need to be taken offline for inspection. Just a guess, for reference.
Is it a liquid medium? There may be turbulence inside, and the gate plate protrudes too much from the channel, causing flutter