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The water pressure is high coming into the house. It is in the range of 80-85PSI and I don't complain about the high water pressure. I am sure that the double check valve and piping have cut this back a bit. Maybe the pressure at the heads is close to their max? I haven't checked this yet and will try to attach a gauge to the last head connection on the zone to see what the pressure really is.
I did turn the valve's flow control down to 50% (about 4 turns fully open then back 2 turns) and this made a difference.
Rainbird 1800-PRS heads already have internal 30 psi regulators. You must have really high pressure (or defective regulators in the heads) for the adjustment to make a difference. Usually, anything under 75 psi is normal for those heads.
Thanks!
Is there a special adaptor available for the nozzle fitting? If not, then I'll make up an adaptor for the pipe thread fitting the head screws onto.
install a pressure gauge on the last head on whatever zone your testing. adjust the flow control till the gauge reads 30psi.
adjusting valve flow control
Are there any tips for adjusting the flow control on Rainbird PGA valves?
Specifically what should I be looking for in spray patterns?
I had adjusted one or two zones down a bit because of misting. There seemed to be too much pressure at the Rainbird 1804 SAM-PRS sprinkler heads.