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The pressure relief valve is a type of valve used to control or limit the pressure in a system or vessel which can build up by a process upset, instrument or equipment failure, or fire.The pressure is relieved by allowing the pressurized fluid to flow from an auxiliary passage out of the system.ressure Relief Valves. Pressure Relief Valves protect against excessive pressure in pump stations, distribution systems, and transmission mains by opening when the inlet pressure exceeds a preset value and discharges high pressure water to waste pump suction or a zone of lower pressure.
A Shear Relief Valve is a type of valve consisting of one or two shear pins used to set the relief pressure. The shear pins are chosen from several standard-sized pins installed on the shear relief valve. A relief valve is a valve that controls the pressure in a system so as to avoid certain accidents like equipment failure.