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safety valve

A safety valve is a valve mechanism for the automatic release of a substance from a boiler , pressure vessel , or other system when the pressure or temperature exceeds preset limits. It is part of a bigger set named pressure safety valves (PSV) or pressure relief valves (PRV). The other parts of the set are named relief valves , safety relief valves, pilot-operated safety relief valves, low pressure safety valves, vacuum pressure safety valves.