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Old 12-13-2013, 08:00 PM
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1idejim 1idejim is online now
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Join Date: Jul 2009
Location: State of Jefferson
Posts: 6,826
The PVB is doing it's job. You have an ongoing upstream negative pressure event occurring.

If I were onsite I would plug off all of the heads on that zone and turn the zone manually. Using a 18 " long 1" or 1-1/4" piece of pipe I'd listen to the valve and each head for water movement noise. The noise will be the loudest nearest to the compromise.

It's a pretty basic concept.

I'm wondering if you are on a well, the zone run/drawdown time is about right for a well.
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