Temperature Pressure Relief Valve How Does It Work
This old house plumbing and heating expert richard trethewey explains the extreme importance of maintaining your water heater s temperature and pressure reli.
Temperature pressure relief valve how does it work. A buildup of mineral salt rust and corrosion can cause a tpr valve to freeze up and become nonoperational. T p valves used on residential water heaters are typically designed and manufactured to relieve pressure at 150 psi and temperature at 210 degrees f. The temperature and pressure relief valve tpr valve opens to release pressure buildup in the water heater when the temperature or the pressure get dangerously high preventing a possible explosion.
One is a pressure relief valve held seated by spring pressure. The second the one that is activated by that floppy sensor is more like an auto engine thermostat activator that reacts to temperature. Whether it uses a paraffin pellet or not i don t know.
The development of the safety relief valve has an interesting history. Asme ansi and csa aga approved relief valves protect the water heater from excess pressures and temperatures by discharging water. How does the temperature relief valve work.
In the normal course of events the valve will simply continue to be closed and maintain the integrity of the system. The last line of defense for pressurized equipment temperature and pressure t p relief valves protect equipment from excess pressure and ultimately catastrophic failure. The valve is the closing element usually in a heating system but it is fitted with a thermostat.
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