What is a thermal expansion relief valve?
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Also to know is, what is an expansion relief valve?
The Expansion Control Valve (ECV) is designed to relieve the increase in pressure caused by the water expansion during the normal heating cycle. This will relieve cold water, not hot water, during the heating cycle saving energy and increasing the life of the Pressure Temperature Relief valve (PTR).
Subsequently, question is, what is an expansion valve on a water heater? A thermal expansion control valve is essentially a pressure relief valve installed at a water heater to prevent forming excessive pressures in the closed loop of water supply piping and water pressure tank when water is heated at the water heater.
Keeping this in view, how does an expansion relief valve work?
As the water heater heats the water, it expands, which builds up pressure in what is now essentially a closed system. When the pressure builds up enough, the T&P relief valve on the water heater just does it's job and relieves the excess pressure by leaking a little water.
What causes a water heater relief valve to open?
Causes and fixes Pressure: If there is no allowance within the system to absorb the increase in pressure such as an expansion tank or a thermal expansion valve and all the taps are closed, the relieve valve will open and discharge water until the pressure drops to below the setting of the relief valve.