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Draw the main line from the location where your plan to install your control valves, time (if automatically operated), and backflow preventer. Draw branch lines from the main line to each head. You can route a branch line to more than one head if you use a 3â4 inch (1.9 cm) pipe, but two should be the limit.
You will need to adjust the manual valve to simulate the back pressure required to operate the sprinklers. Including the pressure drop through valves and station pipes (usually 5 to 10 psi on one acre yards or less) this is typically around 40 to 50 psi total for spray sprinklers, and 60 to 70 psi total for rotors.