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janhuggies 01-16-2009 07:40 PM

Help-Pressure Relief Valve running water constantly
Hi all. After a 10 hour blackout here at -20 celsius, my old boiler won't get up above 8psi and the relief valve has a steady stream of water coming out of it. Suffice to say, 8psi isnt going to get water up to three floors of rads!

I have reviewed the info here and on other sites and believe it is a faulty valve. My question is what are the steps to safely replace the valve. I tried to reseat it to no avail.

So...I picked up an exact replacement today and from what I have read all that is involved is shut off boiler, cool down, shut off intake, and replace valve. Any other advice?


II Weeks 01-16-2009 09:08 PM

call a plumber

you might have to drain your boiler below that relief valve so you would want to to shut all the valves leading to the other zones. After you swap it out, refill and open the valves again youre going to have a lot of air in the system that you'll have to bleed out.

good luck

janhuggies 01-16-2009 09:50 PM


I'm going to try: Power off to the boiler. Shut off water to the boiler. Shut off zone supply. Drain the boiler till no pressure and below the relief valve level. Replace valve. Turn water back on. Turn zone supply on. Turn power on. Then spend a whack of time bleeding rads. :huh:

janhuggies 01-17-2009 05:15 PM

Success!! After a quick phone consult with my HVAC buddy, I isolated the boiler and replaced the valve. All floors now hot and full. Pressure is a little high (25psi), so now I need to figure out why. I have read about the old ceiling expansion tanks being waterlogged so that will be my first check. Can someone (instead of my buddy) remind me of the basic steps to adjust high pressure? Thanks again!

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