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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 relief valve is merely a piston in a cylinder; one end. of the piston normally closes a passageway between. pump discharge and pump intake. The other end of the. piston is subject to water pressure, with this pressure. regulated (modulated) automatically by a pilot valve. Thus, one end (the smaller in area) is subject to pump. discharge pressure, and the other to a pressure which. is modulated by the pilot valve.