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How Sprinkler Valves Work
Your controller sends 24V to a valve’s solenoid, which opens it to water that zone, then closes it when the station ends. One valve per zone. In-line solenoid valves (also called control valves) do the automatic watering; anti-siphon valves add built-in backflow protection in the same body; and ball valves give you a reliable manual shut-off to isolate the system. Group the zone valves on a manifold inside a valve box for protected, serviceable access. Sizing the box? Read our How to Choose a Sprinkler Valve Box guide.
Valve FAQ
How does a sprinkler valve work?
A controller energizes the valve’s 24V solenoid, which lifts the diaphragm and lets water through to that zone. When the station time ends, the solenoid de-energizes and the valve closes. One valve controls one zone.
What size valve box do I need?
Match the box to the number and size of valves it covers. A single valve fits a round box, while a manifold of two or more needs a rectangular jumbo box with room to service each solenoid. Our valve box guide walks the sizing.
Globe or angle valve?
Both are in-line solenoid valves. A globe valve has the inlet and outlet in a straight line; an angle valve turns the flow 90°, which saves a fitting at the base of a manifold or where the supply comes up from below.
What is an anti-siphon valve?
An anti-siphon valve combines a zone valve with a built-in atmospheric vacuum breaker, so it both controls the zone and provides basic backflow protection. It must be installed at least 6 inches above the highest head and cannot be left under continuous pressure.
Ball valve or gate valve for a shut-off?
A ball valve opens and closes a quarter turn and seals reliably, which makes it the common modern choice for a mainline isolation point. Both isolate flow; ball valves are quicker to operate and less prone to seat wear.
Can you repair a sprinkler valve, or replace it?
A sprinkler valve that will not open or close is usually a bad solenoid or a torn diaphragm, not the whole valve. Replacing the solenoid or diaphragm fixes most failures and costs far less than a new valve. Replace the whole valve only when the body is cracked or the threads are stripped. We stock replacement solenoids, diaphragms, and valve repair kits alongside complete valves.
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