Low Pressure on One Zone: Checking Sprinkler Head Screens, Not Valve Screens

A Rain Dial Plus system shows low velocity on one front-yard zone while others work normally. The valve operates correctly. The user suspects a clogged screen but can't find information on valve screens for their Irritrol 2500 or 205 valve.

Valve Screens vs. Head Screens

Matt clarifies a common misconception: "Most sprinklers have screens inside of them." He details locations for both types:

• Spray heads: Screen is just under the nozzle. Unscrew nozzle counterclockwise, clean screen, reinstall, then readjust spray direction by turning the entire head.
• Rotor heads: Screen is at the bottom of the internal assembly. Dig around the cap, unscrew it, lift out the internals and screen, clean, reinstall, and readjust.

Why the Valve Probably Isn't the Issue

Since the valve activates and the other zones work, the main supply and valve inlet screen (if present) are likely fine. The problem is isolated to one zone's distribution. Cleaning the screens on the affected zone's heads is the logical first step—it's easy, free, and solves a surprising number of "low pressure on one zone" calls.