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The zone in the back yard wont quit flooding the yard. I have replaced the zone valve, yet the heads still leak while the system is on. What should i look at next?

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  • andy_wachter Jul 14, 2009

    thats a possibility, how do i get a pressure drop without a leak?

  • andy_wachter Jul 14, 2009

    thats a possibility, how do i get a pressure drop without a leak?

  • andy_wachter Jul 16, 2009

    Yes it does, I think you are right i just dont know how to fix it. i looked at a pressure vaulve but i dont know if that will be the best salution.

  • andy_wachter Jul 16, 2009

    Yes it does, I think you are right i just dont know how to fix it. i looked at a pressure vaulve but i dont know if that will be the best salution.

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Could the zone be siphoning? The valve needs to have a pressure drop across the valve when the system is on.

Posted on Jul 14, 2009

  • Fred Jul 16, 2009

    Does the piping downstream of the zone valve run downhill?

  • Fred Jul 16, 2009

    I suggest that you install a vacuum breaker just downstream of the zone valve. That will prevent the downhill section from pulling suction on the zone valve after it closes. What do you think?

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