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Old 11-01-2011, 06:36 AM   #1
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pressure relief valve leaking on boiler


My pressure relief valve is leaking. Is there any way to tell if its bad? Someone told me it may be my feed water valve or expantion tank thats causing it to leak. I would like to test these and possibly repair myself instead of $$100's of dollars tom call someone.
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Old 11-01-2011, 06:45 AM   #2
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pressure relief valve leaking on boiler


I moved this to the heating section for you----

Most times the dribble is caused by a bad expansion tank----There are some good boiler folks here,so I'll leave this for one of them---Mike----
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Old 11-01-2011, 07:14 AM   #3
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pressure relief valve leaking on boiler


ok, any help guys?
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Old 11-01-2011, 07:17 AM   #4
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pressure relief valve leaking on boiler


my expantion tank is mounted upside down w/ the air valve on the bottom, I took off the cap and pressed it quickly and air came out, not water, should i assume that it is ok then?
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Old 11-01-2011, 07:24 AM   #5
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pressure relief valve leaking on boiler


Not necessarily--Put a pressure gauge on

Some of the best HVAC guys have day jobs (fixing boilers,oddly enough) so have a bit of patience,(or call up a boiler place)----Mike----
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Old 11-01-2011, 07:26 AM   #6
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pressure relief valve leaking on boiler


what is the pressure reading on the guage of the boiler,the relief might be doing what it should do.if the guage is around 20PSI with the system heating the relief might just need to be cycled open to flush out....if your at 30PSI or higher...the EX tank might need draining..lets hear back here... tell us the guage pressure and temp reading on that guage if it has it or the boiler water temp if its somewhere else on that boiler
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Old 11-01-2011, 08:00 AM   #7
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pressure relief valve leaking on boiler


Thanks for your prompt response, I know it was Holloween last night but I think some of us left there claws on! I wasn't being impatiant if thats what it seemed, just trying to give imformation and get answers. The boiler shuts off @ 215-220 deg. and builds almost 40 psi and the drip turns into a dribble and some times will pop off the relief.
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Old 11-01-2011, 10:56 AM   #8
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pressure relief valve leaking on boiler


boiler with hot water baseboard your settings are to high everything is reacting to that setting you get steam at 212F drop it down to 160F-170F should be the norm to make 70F setting on a stat......cold boiler the psi should be the feed RED water reg 12PSI.then heating the water as it circulates starts rising ,the stat satisfies shuts the boiler off tops PSI 20 lbs on that guage ,but not anywhere near 30PSI-35PSI relief blow off.if it were a steam bioler the pressure at 212F would be the controlling point with a one pipe steam system..just so you know.....if you can drain the expansion every month it will give that heated water someplace to expand keeping that pressure down in the 20psi range when its comfortable....get back if you have questions
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Old 11-01-2011, 02:36 PM   #9
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pressure relief valve leaking on boiler


Water temp is very high, and shouldn't have to be that high, unless you don't have enough baseboard in your home.

Next, you shouldn't have checked the air pressure while the tank was connected to the system.

What pressure is your relief valve listed to open at?
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Old 11-02-2011, 08:08 AM   #10
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pressure relief valve leaking on boiler


ok, thanks for the help
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