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Blowout through a doublecheck.

Discussion in 'Irrigation' started by jcom, Oct 9, 2005.

  1. jcom

    jcom LawnSite Senior Member
    Posts: 791

    I need to winterize a system with a doublecheck valve. I seem to remember that not all the water will be blown out if I go through the valve so my question is this. Will enough water remain to cause a freezing problem? Or must I take the valve apart for drainage?


  2. Green Sweep

    Green Sweep LawnSite Senior Member
    Male, from Pittsburgh, PA
    Posts: 322

    I winterize about 30 systems every year that have Watt's 007 Double Check valves outside (not on removable unions). We have always blown through them and have never had freeze damage.
  3. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,799

    jcom, we have not had any problem blowing through a doublecheck testcock.
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,675

    A Doublecheck like the Febco 805Y might need some partial disassembly - specifically the downward-pointing check valve cap. I used to set those at a 90° angle, with the testcocks pointing down, and the check valves on a level plane, so no disassembly was required.

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