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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.
1 Power operated valve-A pressure relief valve in which the main system to relieve pressure combined with and controlled by a device requires an external power source. 2  Is the standard safety valve-a valve opening to achieve the degree of buoyancy required for mass flow increases the pressure to reject over 10%. Bellows valve-A direct-loaded safety relief valve and slide (or part) of rotating elements and sources are protected from the effects of fluid through bellows. 2  The bellows allows such an interpretation, it is as if the influences of pressure. 3  Controlled valve-A valve that consists of a main valve and a control unit.