relief valve
A valve that opens when actuated by blank" >static blank" >target="_blank" >glossary/pressure/" class="glossaryLink" data-cmtooltip="b6e3cde174291783998e58cb8c4763f8" blank" >target="_blank" >pressure above a predetermined level in order to reduce the blank" >target="_blank" >glossary/pressure/" class="glossaryLink" data-cmtooltip="b6e3cde174291783998e58cb8c4763f8" blank" >target="_blank" >pressure to it. (Ching, 1995)
