expansion tank issues

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by James W, Oct 24, 2009.

  1. James W

    James W New Member

    Joined:
    Oct 24, 2009
    Location:
    Richmond BC
    Just had an expansion tank added and now have a whistling noise at the pressure valve when flushing a couple of toilets and seems to be lower pressure in the system. why would an expansion tank have affected flow?
     
  2. Gary Swart

    Gary Swart In the Trades

    Joined:
    Sep 1, 2004
    Location:
    Yakima WA
    Did you use a gauge and air pump to balance the pressure in the expansion tank to match the PRV pressure setting? I'm not sure what an imbalance would do, but they are supposed to be balanced.
     
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  4. Doherty Plumbing

    Doherty Plumbing Journeyman & Gas Fitter

    Joined:
    Jun 22, 2009
    Occupation:
    Red Seal Journeyman Plumber & Licensed Gas Fitter
    Location:
    Penticton, BC
    I have never ran into this problem per say but generally that whistling noise comes from the PRV when it's gummed up a bit or not acting properly. The velocity of the water makes it whistle at high speeds. You can also get the same sound from y-strainers etc.

    I hope this helps.
     
  5. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    Prv

    IT doesn't. Whatever happened is coincidental to the tank's installation. If you had to turn the water supply off, the valve could have failed when it was repressurized.
     
  6. James W

    James W New Member

    Joined:
    Oct 24, 2009
    Location:
    Richmond BC
    blocked connection

    if one of the connections had been oversoldered when installing the tank could tis have caused a drop in pressure? very high whistling noise when flushing toilets after installation complete
     
  7. nhmaster

    nhmaster Master Plumber

    Joined:
    Jul 30, 2008
    Occupation:
    Tech. Instructor
    Location:
    S. Maine
    Change the PRV. Whistling, humming, vibrating all happen when the disc in the valve has worn over the years.
     
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