Plumbing Forum - Professional & DIY Plumbing Forum > General Plumbing Discussion > Water Heaters and Softeners > Why would T&P valve leak when T and P are really low?


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Old 10-18-2017, 01:47 AM   #11
voletl
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Check and see if your expansion tank is still good


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Old 10-18-2017, 11:49 AM   #12
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were is the temperature at on the tank u could be heating the tank up to high


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Old 10-18-2017, 04:33 PM   #13
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I had the temperature turned down pretty low, so much in fact that my kids were complaining that the tub doesn't get hot enough. I turned it back up a bit, but it is nowhere near a dangerous temperature, so I don't think I'm superheating the water to a point that would trip the valve.

The expansion tank is relatively new, within the past 3 years, so I don't think that is the issue. I will get the pressure gauge with the lazy arm tomorrow and check to see if my PRV is going bad.
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Old 10-18-2017, 10:58 PM   #14
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Quote:
Originally Posted by masterjer View Post
Thanks Frodo, I just ordered the gauge with the high pressure arm. The one I got locally doesn't record the highest pressure. At least that will allow me to diagnose the PRV. Why would you suggest installing behind washer? Would that read differently than a hose bib? Unfortunately, my PRV is behind a bathroom vanity cabinet and inside a wall. That will be fun if I need to replace it.
some hose bibs are before the prv,
since i have no idea as to your piping configuration i said to install behind washer where i KNOW that piping is after the prv
IF you KNOW the piping to hose bibs is after the prv, then by all means
feel free to install outside
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Old 10-19-2017, 06:24 PM   #15
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I've resigned myself to the fact that I believe I need to replace the PRV. Even after adjusting it multiple times, the pressure at my hose bib is over 100psi. When I turn on a sink, it drops to below 10psi. After I turn off the sink, it slowly climbs back up to over 100psi.
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Old 10-20-2017, 01:46 AM   #16
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me thinks you are correct
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Old 10-23-2017, 10:08 PM   #17
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Default Thanks for the help, problem solved.

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me thinks you are correct
I spent a few hours over the weekend moving the bathroom vanity and opening up the wall to get good access to my PRV and water shut off valve. The shut off valve was a joke. It is a ball valve with no handle and no stops, so I have no idea the orientation of the ball.

I cut a section of the existing copper to make room for a new shutoff valve and the new PRV. I opted for the double union PRV to make replacement much easier in the future. I had to raise the sink water supply valve a few inches. While I used too much solder (more is better than too little I figure) I was very happy that I got no leaks and the pressure is now rock solid.

I had 110psi at my hose bib and turning on a faucet dropped it to 10psi, now I am solid at 50psi and it drops to 46psi when I turn on a faucet. Must better.

Thank you all for your comments and suggestions.


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