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relief valve

noun
1.
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).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Historical Examples
  • As the pressure lowers, the excess gas can escape through a relief-valve.

    Creatures of the Abyss Murray Leinster

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