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Typical Backflow set-up

Discussion in 'Irrigation' started by JackHarding, Nov 21, 2017.

  1. JackHarding

    JackHarding LawnSite Member
    Male, from Meriden, CT
    Messages: 52

    Curious to see how other people install backflow devices. Typically in CT I see 825Y or 765 (city water) and well properties vary wildly. The two photos below are from my installs; first being city water and the second being well (submersible pump).
    Riverhead well set up.jpg Riverhead city set up.jpg
     
  2. magna111

    magna111 LawnSite Member
    from NJ
    Messages: 165

    Do you remove your backflows for the winter? Looks like you have unions on both sides of the backflow. We install similarly, but different brands. We usually do a boiler drain on both sides of the backflow, usually start the blowout on the discharge side while opening the boiler drain on the pressure side to drain, then when I get to the last zone I'll switch to the other boiler drain to clear the backflow.
     
  3. Srlance31

    Srlance31 LawnSite Senior Member
    Messages: 556

    Like the boiler drains and the unions. It does look pretty well down overall. Can't see the inside (obviously) but usually have a low point drain inside home to drain the backflow out and prevent water from going past the shut off valves and outside. And have a blow out port after the backflow.
     
    benhargreaves likes this.
  4. JackHarding

    JackHarding LawnSite Member
    Male, from Meriden, CT
    Messages: 52

    yes, I remove the backflows. The unions in the pictures have small rubber gaskets that create the water tight joint. When I winterize I remove the unit, hook up a tail piece (1/2 of the union assembly) with the piece left on the riser, then winterize. The backflows go inside the home with the rubber gaskets, otherwise they tend to get lost. I'll post 2 photos in a moment.
     
  5. magna111

    magna111 LawnSite Member
    from NJ
    Messages: 165

    We remove maybe a couple dozen exterior irrigation meters but not backflows. Seems like it'd be a pain in the butt come spring, I know locating and reinstalling those meters sure is.
     
    Love the Green Biz likes this.
  6. AI Inc

    AI Inc LawnSite Fanatic
    Messages: 27,007

    I do mine just like yours, but without unions.
     
    Mdirrigation likes this.
  7. AI Inc

    AI Inc LawnSite Fanatic
    Messages: 27,007

    " sorry Magna , I remembered you were coming today but forgot to leave the BF out for you"
     
  8. magna111

    magna111 LawnSite Member
    from NJ
    Messages: 165

    I can think of at least a few instances where the meter was missing come spring.
     
  9. JackHarding

    JackHarding LawnSite Member
    Male, from Meriden, CT
    Messages: 52

    It definitely adds to the overall time spent at a home, but with the gaskets its not bad to re-install. They unions don't need to be super tight to work. Anyway here's an example of how it works. Generally I use pvc caps for the union ends, one size larger than the pipe. 20171027_100122.jpg 20171027_101238.jpg
     
  10. Srlance31

    Srlance31 LawnSite Senior Member
    Messages: 556

    To me the unions make repairs so much easier.
     

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