re lief valve

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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
relief valve

noun
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 [syn: safety valve
WordNet® 3.0, © 2006 by Princeton University.
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