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Backflow preventor

Discussion in 'Irrigation' started by wattsup, Nov 12, 2002.

  1. wattsup

    wattsup LawnSite Member
    Messages: 123

    After I blow out a system is it necessary to put the preventor in a place where it will not freeze? I have always done that, but it is getting harder to remember where I put those darn things. I was told by another company they just leave them on, but I do not know if this is safe. Thank you.
  2. DanaMac

    DanaMac LawnSite Fanatic
    Messages: 13,221

    If it is blown out and there is no water left inside, then nothing can be damaged due to freezing. The reason it gets damaged is that water expands when it freezes. As it expands it can crack the housing, ball valves, bonnet and poppets, check valves, etc. If it has unions on either side, that makes it very easy to take off. But it's not necessary if there is no water inside.
  3. wattsup

    wattsup LawnSite Member
    Messages: 123

    Well, if you do not do it in CO I am not doing it in TN anymore. Thank you.
  4. gusbuster

    gusbuster LawnSite Bronze Member
    Messages: 1,931

    At my dad's apartments just out of Carson City, we shut off all water suplies and then blow out all back flow devices. The only time that we've had problems was due to improper draining.

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