water-pressure-relief-valve
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water pressure relief valve
Standards
a pressure actuated valve that automatically discharges fluid at a specified set pressure. It is fitted to heaters to prevent the pressure in the water carrying parts from exceeding the maximum working pressure during normal use and from exceeding a pre-determined margin over the maximum working pressure when temperature controls fail to limit pressure
Source - AS 4552-2005: Gas fired water heaters for hot water supply and/or central heating