negative pressure relief valve

A relief valve in an aircraft pressurization system that prevents the pressure in the cabin from becoming lower than the ambient outside pressure.
The cabin-air pressure safety valve combines functions of over-pressure relief valve, vacuum relief valve, and dump valve. Over-pressure relief valve prevents cabin pressure from exceeding specified values; vacuum relief ensures that ambient air pressure is less than cabin pressure by allowing ambient air to enter cabin whenever ambient air exceeds cabin pressure; while dump valve permits depressurization of cabin by cockpit operated switch.

Aviation dictionary. 2014.

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