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If you have antisyphon valves (that's plural, as in one for each zone) then you should employ the flow controls to adjust pressures in each zone.
I use anti-siphon valve and there is no backflow
preventer for the sprinkler system.
Where's the backflow preventer for the sprinkler system?
Water Pressue Regulator
There is a water pressure regulator to home
fixture. But the water pressure to the irrigation
system is too high. I talked with two
plumbers but they gave me different solutions.
I need your advice. Thanks for the help
https://picasaweb.google.com/chi.emailbox/PressureRegulator#5862400968264984738
1. relocate the current water pressure regulator before the house shut off
valve
2. Install another regulator after the irrigation shut off valve.