Installing a Control Valve for an Elevated Flower Bed

Valve Elevation vs. Sprinkler Elevation

Standard electric irrigation valves operate at any elevation relative to the sprinklers—they use water pressure, not gravity, to open and close. The 8-inch mounting height is fine for the valve itself.

Backflow Preventer Requirements

If your valve has an integral anti-siphon (ASV) or you’re using a separate backflow preventer, code requires it to be at least 12 inches above the highest sprinkler head. Since your highest head is 4 feet up, the backflow device must be at least 5 feet above grade. An 8-inch installation violates code and may have been disconnected by an inspector.

Troubleshooting Steps

1. Manually open the valve (turn the solenoid or bleed screw). If water flows, the valve works—check wiring and controller.
2. Dig up the valve box and verify the piping wasn’t cut or capped.
3. If it’s an ASV valve: Relocate it to the required height or replace with an in-line valve plus a separate backflow preventer at the proper elevation.

Replacing Leaking Valves

When you replace the other leaking valves, use the same model (or a direct replacement like Rain Bird DV/DVF or Hunter PGV). Keep the new valve at the same 8-inch height unless it’s an ASV—then follow the elevation rule.