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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. 2015.
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Examples from the Web for relief valve
Historical Examples
  • The oil pressure in these motors is carried at ten pounds, a relief valve being fitted to hold the pressure constant.

    Aviation Engines Victor Wilfred Pag
  • At R is the condenser relief, at U the relief valve for the water chambers.

    Steam Turbines Hubert E. Collins
  • I became aware of the soft, continuous popping sounds of the air-bubbles escaping from the relief valve of the head-piece.

  • A similar test over an equal period may then be conducted with the relief valve not water-sealed.

    Steam Turbines Hubert E. Collins
  • Nor is it less important that careful attention be given to the setting and operation of the relief valve, as will be seen later.

    Steam Turbines Hubert E. Collins

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