safety valve

Definitions of safety valve
1

n a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level

Synonyms:
escape, escape cock, escape valve, relief valve
Type of:
regulator
any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
valve
control consisting of a mechanical device for controlling the flow of a fluid

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