Boiler pressure relief valve slow leak

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  #1  
Old 03-21-15, 06:31 AM
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Unhappy Boiler pressure relief valve slow leak

Hi,

I hope that someone could give me advice, I shut off my gas boiler and am trying to replace my 30 psi pressure relief valve with watts part 354 but is it appears that the new one is slightly different than my old one. The new one has a nut below it and the old valve has the nut on the iron pipe. Do I remove the old nut off the old pipe or take the nut off the new PRV? The reason that I am replacing it is because the PRV leaks slowly maybe by the drip. In the picture, the old one is on the right. Thanks for your help.

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Last edited by NJT; 03-21-15 at 10:41 AM.
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Old 03-21-15, 08:20 AM
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Moved post..

Install the new one on the left intact... Do not seperate nut...
 
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Old 03-21-15, 09:20 AM
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Vinny, if you haven't already, please read this:

http://www.doityourself.com/forum/bo...sion-tank.html

It's very possible that the valve is weeping as a SYMPTOM, rather than the CAUSE.

Please take a picture of where you removed the valve from.
 
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Old 03-21-15, 05:07 PM
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more pics

Hi all, thanks for the replies.

I agree to keep the new valve intact, thanks. So the next part is what to do about the pipe. Here are 2 more pics. Thanks for your help. I did read that post and I will check the expansion tank soon.
 
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Old 03-21-15, 05:28 PM
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What does the pressure gauge on the boiler indicate?
 
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Old 03-21-15, 05:48 PM
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Remove the brass piece and install the new valve.... Whats your issues???
 
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Old 03-22-15, 11:51 AM
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The system usually maintains a pressure of 12-15 psi. The PRV leaks even at 0 PSI. The problem that I am having is that the nut will not come off the iron pipe. I think this PRV was probably installed in 1985. I am using a 14" pipe wrench and there is very little room to put a pipe on the wrench handle for leverage. Thanks for your help.
 
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Old 03-22-15, 12:09 PM
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Use two hammers a large one as the anvil and a smaller one to strike the nut opposite the anvil ,then move anvil around 90 degrees and repeat works every time to disassemble BI pipe .
 
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Old 03-22-15, 12:09 PM
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Then do what you need to do to fix it..remove brass piece from new PRV.

Or remove pipe to boiler and replace with new.

Or get bigger wrenches..

Probably need other work too on the boiler. I see that air vent looks shot and should be replaced....
 
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Old 03-22-15, 01:26 PM
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It took 2 of us to loosen the nut from the pipe. One to hold the iron pipe steady with an adjustable pliers and both of us putting pressure on the nut with the 14 in pipe wrench. Unbelievable when it came loose.

I have a quick question regarding that rusted air vent, it bent a bit as we were trying to break free the nut. Does that air vent just screw off by hand? It did not seem to loosen. We already have another air vent in the system, so this one is always closed.
 

Last edited by vinny121; 03-22-15 at 03:45 PM.
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Old 03-22-15, 01:34 PM
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Does that air vent just screw off by hand?
Yes... CCW to loosen...

Leave it then until the warmer days that are soon to arrive...
 
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