PRV vibration

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by kami25, Jan 14, 2020.

  1. kami25

    kami25 New Member

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    Utah
    I had a PRV that was leaking. Replaced it and things seemed fine for a few days. After that I started getting humming, vibrations in the pipes whenever a a faucet or water source was opened. It went away or seemed to if two or more faucets were opened at same time. No noise when water was off. No hammering. Drained the pipes of air. Was fine for a few days then sounds came back. Turned the pressure up to sixty PSI. Was fine for a few days and the noises came back but not as loud. I put in another new PRV and the story repeated itself. Any suggestions on what to do next?
     
  2. James Henry

    James Henry In the Trades

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    Someone posted a similar situation a while back. Turned out to be a loose washer in his hose bib. Check your fixtures.
     
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  4. kami25

    kami25 New Member

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    Not the fixtures. The pipes are so loud it will wake you in the middle of the night if someone uses the water. The city came out and replaced the meter and could hear it from outside the house. The meter made it a little quieter but it is still too annoying to just ignore. Copper pipes, house built in the early 80's. Never had this issue before. Made a call to the plumber and he said it sounds like a bad PRV. Can't believe I could get two bad ones.
     
  5. hj

    hj Moderator & Master Plumber Staff Member

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    I assume you did not install them backwards, because that can cause the sounds you are hearing.
     
  6. kami25

    kami25 New Member

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  7. kami25

    kami25 New Member

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    Arrow going with the flow of water.
     
  8. James Henry

    James Henry In the Trades

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    Just out of curiosity. Remove the aerator from the faucet and try again.
     
  9. kami25

    kami25 New Member

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  10. kami25

    kami25 New Member

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    Any Faucet, they all cause the noise.
     
  11. James Henry

    James Henry In the Trades

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    Yes. Trying to see if restriction causes vibration.
     
  12. kami25

    kami25 New Member

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    So you are thinking that turning off the main caused some debris to come loose and go to all the outlet? That sounds interesting, but do you think that would cause such loud pipe noise? I will check when I get off work . Thanks
     
  13. James Henry

    James Henry In the Trades

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    I'm just guessing at this point. Can't diagnose it without actually being there.
    Check your hose bibs for loose internal parts or maybe a pipe just came loose in the wall.
     
  14. kami25

    kami25 New Member

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    Took an aerator off and ran the water. Loud humming vibrating. Last night through this morning no sound, or at least not noticeable, but now back as loud as ever. Just when I think it is fixed it starts up again. Plumber suggested that it could be the city’s back flow preventer. Any thought on this? Thanks
     
  15. mliu

    mliu Active Member

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    Post a photo of your PRV installation, showing the piping before and after the PRV.
     
  16. kami25

    kami25 New Member

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    Original was put in by a licensed plumber about 12 years ago. It is located against the foundation wall. D1E2915F-51A3-4350-ACAB-63B509C7D218.jpeg D1E2915F-51A3-4350-ACAB-63B509C7D218.jpeg
     
  17. mliu

    mliu Active Member

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    What was the make and model of the old one? What are the make(s) and model(s) of the two new replacements?
     
  18. kami25

    kami25 New Member

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    The old one was Watts. New one is Watts LF N45B MI.
     
  19. mliu

    mliu Active Member

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    I take it you no longer have the old one since you didn't give the model. That's unfortunate because you could have put it back in service for diagnostic purposes.

    The easiest way to determine if the new PRV is causing the problem is to remove it from your system and see if that eliminates the vibrations.

    Btw, do you have an expansion tank on the inlet to your water heater?
     
  20. kami25

    kami25 New Member

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    No, on the tank. Maybe it is just a coincidence that the noise started after messing with the prv. Almost 25 years in this house and never a problem with the plumbing noise. Any suggestions on where to go from here?
     
  21. mliu

    mliu Active Member

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    Location:
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    First thing is, you MUST have an expansion tank. Most PRV's (and many new service meters, act as one-way check valves. Without an expansion tank, the pressure will get very high from the water expanding in your water heater. The high pressure is enough to cause substantial plumbing damage (and is likely the reason your original PRV started leaking). If the PTR valve on your heater fails, the pressure can cause the tank to explode which could destroy your house and kill the occupants.

    As far as diagnosing your vibration perv problem, the best way is by process of elimination. Since you first noticed the vibration after putting in the new PRV, then you should take it out and see if the vibration stops. You can plumb a pipe with a valve to bypass around the PRV or you can remove the PRV and install a temporary pipe in its place.

    Btw, what is the water pressure coming from the street?
     
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