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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.
The oil pressure relief valve is located at the pulley end of the engine, near the oil pump (on the right in the above schematic). When the oil is cold and thick, the resulting increased oil pressure forces the valve down against spring tension. This allows oil from the oil pump to go directly to the engine bearings.