The temperature of the water in a pressurised unvented or mains pressure hot water heater cannot exceed 99° C. If the thermostatic controlling the element(s) fail the PTR valve operates.

Waterpressure regulator

pressureregulator中文

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The Pressure and Temperature Relief valve (PTR) is designed to relieve the increase in pressure caused by water expansion during the normal heating cycle in a hot water tank. The valve will then relieve the increase in pressure by releasing drips of hot water to the drain line. Should the electrical temperature cut-out device that controls the water heating element ceases to operate correctly, the water will overheat. The Pressure & Temperature Relief Valves function is to release the pressure.

The 90 Series Pressure Reducing/Pressure Regulating Valve (PRV) automatically reduces a higher inlet pressure to a steady lower downstream pressure, regardless of changing flow rate and/or varying inlet pressure. Cla-Val’s PRVs are installed in water distribution systems throughout the world and are known for their superior performance, reliability and long service life.  There are many variations on the basic pressure reducing valve, including but not limited to the following.