relief valve
noun
a device that, when actuated by static pressure above a predetermined level, opens in proportion to the excess above this level and reduces the pressure to it.Compare safety valve(def 1).
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for relief valve
As the pressure lowers, the excess gas can escape through a relief-valve.
Creatures of the Abyss|Murray Leinster