Answer :
Instead of utilizing a fusible plug to safeguard a receiver, pressure relief valves have the advantage of automatically resetting. In the case of an overpressure occurrence, a pressurized vessel or system is protected by a pressure relief valve.
Any circumstance that could raise the pressure in a vessel or system over the designated design pressure or maximum permissible working pressure is referred to as an overpressure event (MAWP).
A pressure Relief Valve's main function is to safeguard people and property by releasing fluid from an overpressurized vessel. There are numerous electrical, pneumatic, and hydraulic systems in use today that regulate the pressure, temperature, and flow of fluid systems.
Each of these systems needs some kind of power source to function, such as electricity or compressed air. A pressure Relief valve must always be able to work, especially during a power outage when system controls are inoperable. Therefore, the process fluid is the only source of power for the pressure Relief Valve.
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