Thanks for the reply and input. I do have "wiggle" room on the shut off - as I can go to 65-70 psi - but I am very hesitant to do this. I understand about using the larger diameter pipe. Are you suggesting the entire zone be "repiped" to greater than the 1inch I currently have? Or just the supply portion to the anti-siphon control valves? Thanks again.
I have 3 zones running off 2-HP pump with bladder. 2 zones (7 heads each - all 1 inch line, Nelson gear driven) are at same elevation as pump (with anti-siphon control valves 1 foot above) and operate correctly; that is, pump runs continously at ~50 psi for duration of cycle. Zone 3 (7 heads - Nelson, 1 inch line also) is at elevation 12 foot higher than pump/bladder. Anti siphon control valve is also 1 foot above this. Problem is when this zone is running, pressure at bladder increse dramatical...
