Pressure Relief & Safety Valves for Water Heaters (Page 3)

The pressure relief valve is a type of valve used to control or limit the build up of potentially damaging pressure within a closed system. The purpose of a Pressure Relief Valve is to open at a predetermined set pressure to prevent the internal components of the appliance  from exceeding their pressure limits. Once normal conditions are restored the valve will close preventing the appliance from losing too much fluid. Pressure Relief Valves can also be known as safety valves or PRVs.