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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. 2015.
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Examples from the web for relief valve
  • 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.
  • Hydraulic relief valve test are to be conducted by engaging the stop ring.
  • The manual test lever on the relief valve should be lifted on a regular basis to determine the valve is functioning properly.
  • Ball valve with integral thermal expansion relief valve.
  • Design and construction of unit and accessories including soot blowers, safety relief valve.

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