The valve is called a t p valve or tpr valve for temperature and pressure relief.
Water heater pt valve.
Temperature and pressure relief valves is suitable for installing at the pressurized solar water heater gas heater electric water heater water heater of fuel heat pump water heater sensitive function heater etc.
If the water heater thermostat fails to turn off at its temperature setting and continues to heat the water indefinitely the tpr valve will open and let the overheated water out.
The t and p valve which is located on the.
The valve will be opened at the set temperature and pressure to protect the water tank.
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.
So when there s a lot of pressure being built inside our electric water heater pressure relief valve it will eventually start leaking water outwards.
If the temperature s or pressure in your tank exceeds a certain level often times 210 degrees and 150 psi the relief valve opens up and allows some water to drain out of the tank.
2 drain the water from the tank until the water level is below the valve s location.
Asme ansi and csa aga approved relief valves protect the water heater from excess pressures and temperatures by discharging water.
On the side or top of your water heater tank is a valve connected to a metal or plastic discharge tube pointing downward.
Every water heater whether gas or electric needs a temperature and pressure relief valve because without one it could begin to leak or even explode.
The last line of defense for pressurized equipment temperature and pressure t p relief valves protect equipment from excess pressure and ultimately catastrophic failure.
Close the shutoff valve on the cold water inlet line that fills the water heater.
Here s how to replace a water heater temperature pressure relief valve.
If it just drips a small amount but at a constant rate try opening then snapping shut the lever on the p t valve a couple of times.
This extra amount of pressure causes the water to expand although it s a closed system that we have in electric water heaters.
When water is heated up inside of a water heater thermal expansion causes the pressure inside of the tank to build up.
1 shut off the cold water to the water heater and gas or electricity that heats the water heater.
If all goes well a tpr valve never gets used except during testing.
The temperature and pressure relief valve t p is an important safety feature that prevents pressure from building up that could damage the water heater and even your home.
If that pressure gets too high your water heater runs the risk of exploding.
The p t valve is located on the exterior of the water heater behind the access door.
If water is profusely emanating from the p t valve it may need replacing.
Technically speaking when a water heater warms the water inside the tank it builds up quite a good amount of pressure.
