Relief Valve 03 : (1) A pressure control device on a pump. (2) Any valve designed to forestall an unsafe condition by relieving excessive pressure, temperature, or vacuum
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}