If your valves are antisiphon valves, they are by code and proper practice, required to be 12" ABOVE the highest head on the zone. In your case, you will always have drain back of all the water in the zone pipes at the end of each cycle. But at some point, the water would stop dripping. If your valve leak continuously, then they are leaking, and replaceing or repairing the valve adapter is the fix.





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