relief valve

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

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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Example sentences
The home was built with special features which include an emergency pressure
  relief valve.
The hydraulic cylinder was equipped with a pressure relief valve in the ram.
If there were no expansion tank, the hot water would be released through the
  pressure relief valve.
On small systems, a safety relief valve is normally installed and the pipe
  stress safety factors increased.
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