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Thread: Boiler pressure relieve valve leaking

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    DIY Junior Member Arepa's Avatar
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    Question Boiler pressure relieve valve leaking

    Hey guys,

    I have this boiler with a coil for domestic hot water. Once the pressure relieve valve started to leak I replaced it right away since it was at least 15 years old. That did not resolve the problem, so I checked the expansion tank, model 110, and there was no air at all in there. I pumped 12 PSI of air as it comes from factory, the tank holds the pressure fine, but the valve still leaks. For kicks, I pressurized the tank to 30 psi and the valve still leaks!!! That is with the boiler off, so that is just from the water pressure of a well which has very little pressure... The expansion tank is about 15 years old. I think there is a 3rd thing I could look into on this situation but I cannot remember... Any suggestions would be greatly appreciated.

    Steven

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    What is the pressure on the boiler? Your pressure reducing valve that feeds the boiler can also be bad.

    John

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    DIY Junior Member Arepa's Avatar
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    Quote Originally Posted by johnjh2o1 View Post
    What is the pressure on the boiler? Your pressure reducing valve that feeds the boiler can also be bad.

    John
    If I am reading that gauge correctly, it is 35 PSI... and I do not see an adjustment on the pressure reducing valve. How much pressure should the water on the boiler have?

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    DIY Junior Member Arepa's Avatar
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Size:  35.3 KB Here is a pic of the reducing valve I have... I cannot tell the brand, I know that the watts brand is very simple to adjust the pressure by losing the bolt, and turn the top section. Anyone knows if this one can be adjusted and to what value? Thanks

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    It's adjusted by loosing the screw in the top. But they don't just go out of adjustment. But they do fair and need to be replaced. According to your temperature gauge the boiler is off. If it is off the high pressure shows that the problem is in the feed valve. The pressure relief valve is doing it's job.

    John

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    Retired Defense Industry Engineer jadnashua's Avatar
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    A typical boiler operating pressure for a residential system is in the area of around 12-16psi (around one atmosphere). Some need more, but look at the relief valve, it's probably a 30psi version - a 2x safety factor is pretty common. It's pressurized to prevent the boiler water from boiling in the heat exchanger.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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