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a device that, when actuated by a gas or vapor pressure above a predetermined level, opens and allows the gas or vapor to escape until its pressure is reduced to a pressure equal to or below that of the predetermined level.
Compare relief valve.
a harmless outlet for emotion, tension, etc.
safety valve
a valve in a pressure vessel that allows fluid to escape when a predetermined level of pressure has been reached
a harmless outlet for emotion, energy, tension, etc


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