Pressure Valve

Rdriver

hi folks. The pipe out of the furnace feels hot and is draining. Expansion tank was recently replaced. Should I replace the pressure valve?

Jamie Hall

Somewhere on that boiler there is a pressure gauge… what does it read?

There are a number of reasons why the pressure relief valve could be operating, none of them good. But one really needs to know what pressure the system is running at to start figuring out which possibilities to look at…

Rdriver

here’s a picture of the pressure gauge on the boiler and also the pressure gauge for the radiant floor heating pipe. When these pictures were taken in the System was not running.

Rdriver

@Jamie Hall I should’ve thanked you earlier for your response

Jamie Hall

No problem. That cold pressure is fine. Is the pressure relief valve dripping when the system is cold, or only when hot? And if it is when hot, what is the pressure when it is hot? You say the expansion tank is new, but I wonder if it was correctly precharged?

Rdriver

what’s the symptom of an incorrectly precharge expansion tank? The folks who installed the expansion tank are coming out again tomorrow to replace the pressure valve, but I’m suspicious.

Rdriver

here’s a picture of running and hot

Rdriver

here’s a sound I get when typing the expansion tank not sure if that helps

I guess I can’t attach a video, but it doesn’t sound hollow

Jamie Hall

Somethings off — the temperature in the second photo of the gauge is the same as in the first…

EBEBRATT-Ed

That gauge could be bad. When they go they usually indicate temperature ok but the pressure is wrong .

Either way I would put a pressure gauge on a drain valve so you can figure it out.

hot_rod

How hot does the boiler run? Check pressure at the highest temperature. 180 maybe?