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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.
Sprinkler systems have valve controls for an area, or zone. Sprinkler valves have an electrical solenoid on top that receives a signal from the controller as to the time and duration of an irrigation schedule. Systems require annual maintenance before the first use to flush any debris or sand in the water pipes.. Mark each valve with a white paint marker to indicate a zone number that it operates. For future use, make a diagram of your sprinkler system on paper, showing the location of each valve box, each valve and the area it irrigates.