Can a self-acting control valve be used as a pressure relief valve?
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As the title suggests, can a self-acting control valve be used as a pressure relief valve?
It uses the pressure and temperature of its own medium as a source of energy to drive the valve to operate automatically; in other words, it is automatic, not manual
It doesn’t seem to be just simple pressure release
Yes, but there needs to be a manual valve after it
A pressure relief valve can prevent excessive pressure in a pressure system. The pressure relief valve opens to release excess liquid, thereby preventing the pressure from rising above the desired level. The pressure at which the pressure relief valve begins to open is the pressure relief setpoint. Self-acting control valves can be used entirely as pressure relief valves
A self-acting control valve is used to stabilize system pressure; it generally operates based on feedback from behind the valve. When the pressure of the medium in the pipeline in front of the valve is higher than that in the pipeline behind the valve, this valve is used to maintain a stable pressure in the area behind it. For example, in compressors and steam turbines, nitrogen introduced from the main pipeline is controlled in terms of pressure by means of self-acting control valves.
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The stand-alone control valve stabilizes the system pressure, using pressure measurement after the valve. But for pressure relief, it seems that taking the pressure reading in front of the valve would work as well, right?
A self-acting relief valve, or back pressure valve, can be used as a pressure relief valve.
A stand-alone control valve can use pressure sampling in front of the valve and a pressure relief method to control and stabilize the pressure within the system ahead of the valve. The nitrogen sealing devices commonly used in storage tanks typically consist of two self-acting control valves: one is used to supply nitrogen to the tank, while the other self-acting control valve, which measures pressure downstream of it, is used to regulate and stabilize the pressure ； The nitrogen from the pressure relief storage tank is used for pressure relief, with a stand-alone control valve that measures pressure before the valve being employed to regulate and stabilize the pressure.