Every zone on the plot plan must have its own valve. The valve controls the on-off flow of water to a sprinkler zone. Indicate one control valve for each zone and then group the valves together in an assembly called a valve manifold.
Determine where you want the valve manifold for each area. You may want a manifold in the front yard and one in the back yard, or you may want more locations. Manifold placement is entirely up to you. We recommend placing the manifold in an accessible spot for easy maintenance. Place the manifold close to the area the valves will serve, but where you will not be sprayed when activating the system manually.

Lateral Line

The two most common types of pipe used in sprinkler systems are polyvinyl chloride (PVC) and polyethylene (Poly) Check with your local Hunter dealer to find out which type of pipe is used in your area.

1. Draw a line connecting all of the sprinkler heads in each separate zone. Follow the example in the illustration on this page and draw the most direct route with the fewest turns or changes of direction as possible.

2. Draw a line from the sprinkler line to the zone valve. This should be the most direct line possible.

3. Begin sizing the pipe. Start at the head farthest from the zone valve. The pipe connecting the last head to the second to last head should be 3/4" (See Pipe Sizing Chart.)

4. Add the GPM requirements of those two heads together to size the next pipe.

5. Add the GPM requirements of the next head to the previous total.

6. Continue to do this until you get to the zone valve. Be sure not to size a pipe smaller than the chart indicates.

7. Repeat Steps 1 through 6 for each zone.

Main Line

1. Determine the location for the system point of connection (P.O.C.). It should be near the water meter.

2. Draw a line connecting all the manifolds together, and then draw a line connecting this line to the P.O.C.

3. The main line should be one pipe size larger than the largest lateral line.

Courtesy of Hunter Industries Inc.