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Thread: Check Valve sticking in hot water recirc

  1. #1

    Default Check Valve sticking in hot water recirc

    Hi: I have a hot water recirc line with insulation feeding back to the cold input on the h/w tank. Just before the cold connection I have installed a brass flap style check valve in a horizontal position.
    The recirc, without pump (convection) works well.
    I have had problems with the check valve sticking.
    When this happens I get cold showers when the cold short circuits.
    Last time, about 6 months ago, I took the valve all apart, the pivot pin, flapper and made sure they were all clean and smooth. Heck of a job to get the pin out!
    It has started to stick again as noticed by cold showers.

    My water is very pure, rain water that is ozonated, passed through a carbon filter and finally through a whole house R.O.

    I know I cant lubricate it, any help appreciated.

    Doug Q.

  2. #2
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Yakima WA


    First, is the valve set level? If it is, then I replace the valve. They're so cheap, you can afford to mess with them.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    From what I read, RO systems create really agressive water and you may have trouble with many metal components. Water is sometimes referred to as the universal solvent - and by removing all the impurities with RO, it really can attack things. That may be why you have trouble with the check valve. My unprofessional opinion.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014


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