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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.
Control valves. 1  Pressure relief valves are used in several places in hydraulic machinery; on the return circuit to maintain a small amount of pressure for brakes, pilot lines, etc... On hydraulic cylinders, to prevent overloading and hydraulic line/seal rupture.