A temperature relief valve is used in situations where excessive temperatures could create danger or even explosion.
How Does the Temperature Relief Valve Work?
The valve is the closing element (usually) in a heating system but it is fitted with a thermostat. In the normal course of events the valve will simply continue to be closed and maintain the integrity of the system.
If something goes wrong and the system starts to overheat, the thermostat in the valve will react and, if the temperature rise is high enough, will push the valve open and release the pressure that is always associated with excess heat.
Where Will You Have One?
You will find pressure relief valves on any hot water tanks in your house and associated with boilers.
Why You Need Pressure Relief Valves
Uncontrolled increases in the heat in any hot water system will eventually cause an explosion at the weakest part.
This explosion would be bad enough, but it could also be accompanied by streams of scalding hot water.
The temperature pressure relief valve will prevent explosions and draw your attention to the problem by releasing clouds of steam and whistling.
If a pressure relief valve operates—call for expert help and close down any boilers.