(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 3 of 3

Thread: Bad pressure regulator?

  1. #1

    Default Bad pressure regulator?

    Hello all,

    My relief valve on my water heater tripped open earlier today and now leaks intermittantly. I took my pressure guage and checked the pressure at my front (upstream of the PR) and back (downstream of the PR) and got 140PSI and 105PSI, respectively.

    The PR is rate for 25-75 PSI so I ASSume the PR is bad, or going bad, but it still seems to be reducing the pressure. So my questions are:

    1. Should I call my county to report the 140PSI incoming pressure?
    2. Should I call a plumber to replace the PR?

    The water is already turned off to the house.

    Thanks!

    PS: Last year I posted many questions about a major bathroom remodel where I changed the entire layout. Thanks to all of your patience and good advice I am happy to say that the county signed off on the CO last week! Thanks!

  2. #2
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Location
    Yakima WA
    Posts
    7,246

    Default

    More likely you need a thermal expansion tank. Heated water expands and has to go somewhere. If you have no PRV, the expansion is absorbed by the water main. A PRV has a check valve that prevents that. The resulting pressure reaches the limits of your T/P and it opens as it is supposed to do.

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,655

    Default

    You need to check the upstream pressure while a faucet is running, and shortly afterwards. If the pressure stays constant you need to adjust the pressure regulator, if it is low with the faucet running and then starts to increase afterwards, repair or replace the regulator.

Similar Threads

  1. Changing water pressure on house pressure regulator.
    By kskier in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 2
    Last Post: 04-30-2010, 09:20 AM
  2. How to choose a pressure regulator?
    By redsoxfan in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 6
    Last Post: 12-20-2008, 03:31 PM
  3. Water Pressure Regulator
    By steveg91 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 6
    Last Post: 02-01-2007, 07:47 AM
  4. Where to install a pressure regulator
    By Guest in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 12
    Last Post: 01-25-2006, 04:14 AM
  5. Where to install pressure regulator?
    By Vitaliy in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 1
    Last Post: 09-01-2005, 08:13 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •