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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.
They are used for the limitation (DB) or limitation and solenoid. actuated unloading (DBW) of the control pressure. The pressure relief valves (DB) consist mainly of the main valve (1) with main spool assembly (3) and pilot operated valve (2) with. pressure adjustment element. Pressure relief valve type DB. The pressure present in port A acts on the main spool (3). At the. same time pressure is applied via the control lines (6) and (7), which. are fitted with orifices (4) and (5), on the spring loaded side of the. main spool (3) and at the ball (8) in the pilot control valve (2).