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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. Safety relief valves (SRV) are designed and used to protect a pressurised system against excessive operating pressure and must open at a maximum of +3% of a predetermined set pressure and close within â10% of the set pressure to meet ISO standard requirements (for single phase flow conditions).