Pressure Relief Valve (Prv) 1 : A device mounted on a hot water heater or boiler which is designed to release any high steam pressure in the tank to prevent tank explosions
Complete Design, Inc. (Construction Design Specialists), Dictionary of Construction Terminology, Washington, USA 2015. http://completedesign.cc/client-resources/dictiona ry-of-construction-terminology, (Const - Amer) {836}