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How to Manage Pests

The UC Guide to Healthy Lawns

Control valves

What they do

The control valves regulate the flow of water through your entire irrigation system, from the main water source all the way to the sprinkler heads. They may or may not be connected to an automatic timer. If connected, they are opened and closed by the timer. Otherwise they can be turned off and on manually. Generally, only part of the lawn is watered at a time so that there is not a decrease in water pressure. To keep the water pressure rate constant, several valves may be used, with only a few sprinkler heads connected to each one. Most homes have several valves designated for the front lawn and several others designated for the back.

What to look for

Each valve should have an antisiphon device to prevent water from backing up into your house water supply. Separate valves should be used to regulate water flow to areas of your yard with different water requirements.

Photo of control valves

Statewide IPM Program, Agriculture and Natural Resources, University of California
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Agriculture and Natural Resources, University of California

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