Daily Almanac for
Nov 28, 2009
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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. Cf. safety valve (def. 1).

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

relief pitcherrelier
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