Definitions for "Pressure Relief Valve"
Keywords:  heater, boiler, valve, relief, preset
a valve designed to open automatically to relieve pressure and keep it below a designated level.
Safety valve. A device mounted on a boiler, which is designed to release any high steam pressure and thus prevent boiler explosions.
A pressure relief device which is designed to open and close at a predetermined pressure
A device which limits the maximum system pressure by exhausting the compressed air to atmosphere when the required back pressure is exceeded; also known as a Back Pressure Regulator.