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Old 11-15-2015, 11:16 AM   #1
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Water Pressure in house is high?


We recently bought this house. It is 15 years old.
It has city water.

I recently installed an RODI system. The system came with an incoming pressure gauge. It was reading 85psi when all water was off. It dropped down to 60psi when the water was running.

I thought maybe it was a cheap gauge, so I bought another one for the hose spigot.
Same thing. The pressure quickly recovers to 60psi but creeps over a few minutes to 85psi.

I tried to adjust the regulator, but alls that does is change the initial point.
I dropped it down to 40psi, but over time it will go back to 85psi.
Then I get low flow in the house.

Is this normal?
Is the regulator leaking internally?
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Old 11-15-2015, 12:40 PM   #2
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Replace or rebuild the pressure regulator. It is not normal for pressure to increase when water is not in use. Do you have a thermal expansion tank on your water heater Not having one may also cause this to happen.
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Old 11-15-2015, 01:10 PM   #3
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We do not have an expansion tank and have electric hot water.

Can I rebuild the regulator without cutting it from the plumbing?
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Old 11-15-2015, 01:11 PM   #4
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I have access but would rather not cut the copper pipes
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Old 11-15-2015, 02:59 PM   #5
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If it's bad, it's better to replace it imo. However, they can be rebuilt without cutting it out. Whether you replace it or rebuild it, the main water will have to be turned off. This may or may not be your problem.

As mentioned, not having an expansion tank on your water heater could also cause your problems.

Please post a picture of your water heater set-up. Thanks.

Last edited by jmon; 11-15-2015 at 03:05 PM.
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Old 11-15-2015, 07:59 PM   #6
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Same happened to me a couple years ago. I bought an identical new regulator and when the old one proved to be to difficult to remove (threaded connections) I just removed the cap and guts from the old and replaced with the same from the new. 5 minutes and done. If you can find the exact same unit, or just the replacement diaphragm, that is the way to go.
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Old 11-15-2015, 08:36 PM   #7
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I would install the expansion tank first. A Pressure reducing valve has a port that allows water pressure from hot water expansion to go back to the city main. It may be blocked. This will cause what you are experiencing. Install it on your cold water at any convenient area.

You should have one anyways with a PR valve on your main.

Last edited by Ghostmaker; 11-15-2015 at 08:39 PM.
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Old 11-16-2015, 06:35 AM   #8
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Definitely, if you don't have an exp tank install one. But if the regulator is bad the pressure will still eventually equalize at city line pressure. In my case the regulator slowly leaked by so it just took a awhile to compress the air bladder in the exp tank. When I shut off your last faucet or whatever I could watch it creep up as this process played out. So how fast this happens probably depends on how your regulator is failing... wide open, or like in my case, a sloooow bleed by.
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Old 01-08-2016, 09:37 AM   #9
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What did the problem turn out to be?

I had the exact same problem. Mine turned out to be a bad pressure reducing valve and a bad expansion tank.
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Old 01-08-2016, 12:28 PM   #10
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I ordered the guts to swap on the reducing valve.
Have not done it yet. Maybe this weekend.
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Old 01-21-2016, 06:14 PM   #11
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I worked on this today.
Took abot 15min.
Pulled the old guts and put new ones in.

There was sort of coarse debris on the screen. And the plunger on the valve was sticky. Water currently set at 62psi. Held 62psi for an hour. Also opened up supplu valve for full flow. Have better water volume in shower now
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Old 10-27-2016, 06:48 AM   #12
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Re: Water Pressure in house is high?


Now I have something very odd the past two weeks. At 7am every morning I get a high pitched howl/squeal. Hard to determine if it is the regulator or somewhere else in the pipes. If I turn the water off, then back on it goes away until 7am the next day. Any cle on this one?
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Old 10-27-2016, 08:08 AM   #13
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Re: Water Pressure in house is high?


Quote:
Originally Posted by theedudenator View Post
Now I have something very odd the past two weeks. At 7am every morning I get a high pitched howl/squeal. Hard to determine if it is the regulator or somewhere else in the pipes. If I turn the water off, then back on it goes away until 7am the next day. Any cle on this one?
Have you done anything with the toilets (fill valves, flappers, etc.)?

Are you doing anything special when you hear the noise, like flushing toilet, showering, running the water, dw, wm? Just guesses, try to narrow it down.
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Old 11-01-2016, 04:09 PM   #14
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Re: Water Pressure in house is high?


We are sleeping. All this past week at 7am same thing.
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Old 11-01-2016, 04:11 PM   #15
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Re: Water Pressure in house is high?


Last night I hooked my pressure gauge. 62psi.
7:01am when the pipes made noise it was 42psi.
Shut off the main then turned back on it was 62psi again.
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