When the air flow on the downstream side of the self-acting pressure regulator is 0, do the pressures before and after remain unchanged, or do they gradually reach equilibrium?
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For example, if the pressure at the front is 1 MPa and the pressure at the back is reduced to 0.2 MPa, then if gas supply to the back is stopped, can a self-acting pressure regulator maintain a pressure of 0.2 MPa there? If this is to be achieved, how should the regulator be selected? Thank you to all experts for helping with this question
It seems I’ve seen a similar post before; you might want to search for it. That post is about the gas supply to downstream users, but as the number of downstream users decreases, the pressure in the pipeline downstream of the valve increases.
Are there no users downstream? Is it considering the valve’s sealing performance?
If the gas supply is interrupted and the pipeline becomes sealed… when the pressure exceeds the set value, the valve will close. Under normal conditions, there is no leakage, not even of steam. Cavitation may occur over time, leading to leakage. If the pipeline is not sealed after the gas supply is interrupted, the valve will still open to allow gas to flow, until the pressure behind the control valve reaches the set value!