Thread: Is this an old tpr valve?

Hello all,

This was just above a water heater that was installed in 08. Is this an old tpr valve?

If not what is it?

Thank you

mk

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Originally Posted by Mike Krueger

Hello all,

This was just above a water heater that was installed in 08. Is this an old tpr valve?

If not what is it?

Thank you

mk

It is not a TPR valve. TPR valves have a probe that goes into the tank.

It could be an expansion relief valve. Used in place of an expansion tank. If that is what it is (does not look like any I have seen) it needs to have a discharge line attached to it.

Originally Posted by Scott Patterson

It is not a TPR valve. TPR valves have a probe that goes into the tank. Good point!

It could be an expansion relief valve. Used in place of an expansion tank. If that is what it is (does not look like any I have seen) it needs to have a discharge line attached to it.

Yes it does have a discharge line so it might be expansion relief valve.

Thank you for the info Scott
mk

Originally Posted by Mike Krueger

Yes it does have a discharge line so it might be expansion relief valve.

Thank you for the info Scott
mk

It looks like an adjustable pressure relief valve to me.

Most TPR's are set to pop off at 150psi or at 210 degrees -- In instances where it is impractical to run the TPR outside or to an indirect receptor, a Plumber will install a pressure only relief valve, usually set to pop off at 125psi on the cold water line.

Usually high enough to allow the discharge to gravity drain to the ground outside.

To clarify what has been said in the posts above: TPR or T&P are "combination" 'temperature and pressure' relief valves, that valve is 'pressure' only (and thus sometimes used for as a thermal expansion relief valve, but the better solution is to install a thermal expansion tank).