Water pressure Problem

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Jsiceloffj, Mar 19, 2011.

  1. Jsiceloffj

    Jsiceloffj New Member

    Messages:
    2
    Location:
    North Carolina
    I have a 3/4 in incoming line from a municipal supply with a pressure regulator set at 60 PSI. During the day, the pressure varies from 60 PSI to 100 PSI. This is measured on a gauge after the regulator. It returns to 60 PSI after a time, only to return to 100 PSI later. The regulator has a range of 25 to 75 PSI. I do not have an expansion tank. Is that a solution?
    Obviously this is causing many problems with my plumbing. Any ideas?
    Last edited: Mar 19, 2011
  2. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,280
    Location:
    Land of Cheese
    If you have a regulator, you must also have an expansion tank. If you have a working expansion tank, then your regulator is not working.
  3. SacCity

    SacCity In the Trades

    Messages:
    189
    Location:
    Sacramento, CA
    Sounds like you need to replace the regulator, this is more common with hard water than soft.
    As a band aid you may try cycling the regulator, adjust it all the way down and then all the way up several times to try and break free any gunk in the valve before setting the pressure

    Michael
    Last edited by a moderator: Apr 6, 2011
  4. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,185
    Location:
    NW Ontario, Canada
    In the absense of the required expansion tank, I would not draw that conclusion.
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,319
    Location:
    New England
    Hot water usage without an expansion tank will do that. Do a quick experiment. When the pressure is high, open a cold faucet. Verify the pressure drops to your regulator setting (60psi). Then, don't use any water, hot or cold for awhile. My guess is that the pressure will stay fairly constant. If it doesn't, the regulator is probably bad. Then, run a bunch of hot water, then don't use any...watch the pressure gauge...if it rises as the water is heated, you've verified expansion as the problem, and that's exactly what an expansion tank is designed to take care of. The more hot water you use, the more cold has to be heated, the more expansion, and the higher the pressure will go.
  6. Jsiceloffj

    Jsiceloffj New Member

    Messages:
    2
    Location:
    North Carolina
    Thanks alot. Joe
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