Self-acting control valve
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Question: Do self-acting pressure control valves have a check function? If fluid backflow is to be prevented, is it necessary to install a check valve after the self-acting control valve? I hope fellow sea lovers can help clarify this. Thank you :)
In principle, it has a check function, but in practice it is different from a check valve; its application range is limited, it requires low cleanliness standards, it is mostly used with auxiliary fluids, and the maximum pressure difference generally does not exceed 1 MPa, etc
So, to prevent backflow, is a check valve usually installed after the self-acting valve?
Generally, check valves are not needed where self-acting valves are used. Tell me about the situation, such as the medium and the facilities at the front and back
The pressure of the combustible gas is low – should nitrogen be added to the system? A check valve must definitely be installed; even with a check valve in place, it cannot guarantee that there will be no backflow when the nitrogen pressure is low.