Check Valve sticking in hot water recirc

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by dougq, Mar 4, 2005.

  1. dougq

    dougq New Member

    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. Gary Swart

    Gary Swart In the Trades

    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. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    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.
Similar Threads: Check Valve
Forum Title Date
Plumbing Forum, Professional & DIY Advice Hot water at cold tap: questions about recirc pump, sprinklers, and check valves May 5, 2014
Plumbing Forum, Professional & DIY Advice Boiler system for hydronic heat - where to put check valves? May 5, 2014
Plumbing Forum, Professional & DIY Advice Sewage sump failures and check valves Mar 5, 2014
Plumbing Forum, Professional & DIY Advice flow check valve + circulator or circulator with flow check integerated? Feb 3, 2014
Plumbing Forum, Professional & DIY Advice Check valves in hot water recirc loop Feb 2, 2014

Share This Page