Sprinkler Anti Siphon valve is leaking from cap

Discussion in 'Lawn Care/Landscaping' started by JoeyDYI80, May 29, 2020.

  1. JoeyDYI80

    JoeyDYI80 New Member

    Jan 24, 2020
    San Diego
    Tonight after I manually turned on one of my sprinkler zones for few minutes and after it was done I noticed that water was continuously leaking from the underneath the cap of the anti siphon valve. I thought it would stop after a few minutes, but it did not. When I tried to turn on the sprinkler zone again the water would stop, but after closing it again it would leak again. So I just went ahead and shut off the valve for the whole sprinkler system until I was able to troubleshoot.

    So in my situation do I need to replace the whole anti siphon valve unit or can I just fix the cap part. I am attaching a pic with the part circled in red to indicate where the leak is coming from. Any help would be appreciated.

    Anti Siphon Value.jpg
  2. fitter30

    fitter30 Well-Known Member

    Feb 2, 2020
    Retired service tech
    Peace valley missouri
    There should be a rebuild kit for it. Just google model and brand for the the parts.
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  4. wwhitney

    wwhitney Well-Known Member

    Mar 17, 2019
    Berkeley, CA
    The anti-siphon is downstream of the valve, so I believe either

    (a) the valve isn't fully closing and is letting some water past or
    (b) the zone has outlets at a higher elevation that your anti-siphon unit (which I believe it shouldn't) and you just haven't waited long enough for it to empty the zone.

    Cheers, Wayne
  5. WorthFlorida

    WorthFlorida The wife is still training me.

    Oct 28, 2009
    Orlando, Florida
    A leaky valve would not cause the anti siphon to open. wwhitney (b) is more likely the cause.
  6. Reach4

    Reach4 Well-Known Member

    Sep 25, 2013
    With a regular spigot with anti-siphon, you can clean debris out under the cap, and often need no new parts. Is it similar with a valve like Joey's?
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