Backflow Prevention

Discussion in 'Irrigation / Sprinkler Forum' started by rockycmt, May 1, 2008.

  1. rockycmt

    rockycmt New Member

    Messages:
    129
    Location:
    New York
    My town requires backflow prevention as it should. I am wondering if it is a good idea to place the unit outside underground in a box or in open air. I want to avoid putting anything in the house cause the branch going outside is a short run and there is not much length to put in the device. Also, must I use copper all the way up to the unit?
  2. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,329
    Location:
    Yakima WA
    There are some that must be set not only above ground but higher than the highest sprinkler. Others can go either way so it's a matter of personal preference. I have mine in a box under the surface, mostly because there was on good place to put it above ground that would not be in the way of mowing. I also pull it out in the fall and store it indoors for an extra measure of protection against freezing. Now days, a hunk of brass like that above ground might be a theft waiting to happen.
  3. designsoutdoors

    designsoutdoors New Member

    Messages:
    2
    Outside in a box or in the open it won't really matter. It will still require the same protection from the weather if your in cold country. Besides, although better protection is provided from within the house, it sure can be a hassle for winterization. Leave it outside. Copper is a good idea but not a requirement in all jurisdictions. Sched 40 will be adequate and my choice. Again, check with your local authority.
  4. Wet_Boots

    Wet_Boots Sprinkler Guy

    Messages:
    798
    Location:
    Metro NYC
    This is a location-specific question, so please supply yours.
  5. rockycmt

    rockycmt New Member

    Messages:
    129
    Location:
    New York
    Northeast in Long Island NY
  6. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,329
    Location:
    Yakima WA
    Either design it for easy removal or make d@@n sure you have it well blown out every fall.
  7. Wet_Boots

    Wet_Boots Sprinkler Guy

    Messages:
    798
    Location:
    Metro NYC
    Other backflow preventers might be used, but the Pressure Vacuum Breaker is almost always a best bet. It works on gravity, if located properly, and gravity is something in which you can trust.
  8. slimjim43

    slimjim43 New Member

    Messages:
    10
    I noticed my irrigation valve is not Anti-Siphon Valve, instead it's a inline valve. I know to prevent backflow, you should have anti-siphon valve installed. Should I be concern and have it replace with anti-siphon valve?
  9. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,329
    Location:
    Yakima WA
    Suppose a dog was roaming in your yard and did his business on top of a sprinkler. That evening it rained and part of the doggy-do washed into the sprinkler. Without a backflow prevention device, that contamination could be siphoned into your household water and into the city water main. So, what do you think you should do? Not only should you have one, it should be certified annually to make certain it is still functioning properly. Case in point. My city requires annual inspection and certification. (Failure to do so results in the water being shut off) When I had my double check valve backflow preventer inspected this spring, the inspector found both check valve pistons had worn to the point they would no longer hold the prescribed pressure. Total tab for inspection and repair was $50.
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