Valves Won't Shut Off Regularly: Adjust Flow Control First

Intermittent Valve Sticking Open on Well System: Flow Control Fix

Valves work sometimes, but sometimes run past timer shutoff. Well system. Too much pressure? Backflow valve help?

Not Pressure—Flow Control

High pressure doesn't prevent closing. The issue is flow control set too open, slowing or preventing diaphragm closure.

Adjustment Procedure

1. Close flow control fully (clockwise).
2. Open fully (counterclockwise), counting turns.
3. Close back down to halfway.

Do this on all valves. Backflow preventer won't fix this.