How to Turn On Sprinkler System Valves: A Step-by-Step Guide

Identifying and operating the various valves in a sprinkler system can be confusing, especially when multiple valve types are present. A homeowner provided a photo showing seven numbered valves and needed guidance on which to open for system startup.

Valve Identification and Operation

• Valve #5 (Red Gate Valve): This is the main shutoff for the irrigation system. Turn it on first.
• Valves #1 and #7 (Blue-Handled Ball Valves): These are isolation valves. Open them fully by aligning the handles parallel to the pipe.
• Valves #2, 3, 4, and 6 (Petcocks): These are drain/test ports. Before opening the main valves, close each petcock by turning the top screw perpendicular to the valve body. This prevents constant spraying. In winter, open them to drain the system and prevent freeze damage.

Winterizing Beyond Petcocks

Simply opening petcocks may not remove all water. For complete winterization, have the system "blown out" with an air compressor connected to the mainline. This forces water out of all pipes and heads. Most irrigation companies charge $50–$75 for this service, which is highly recommended in freezing climates.