Ridell 1" Valve Won’t Close: Exhaust Port Blockage

Plugged Exhaust Port Prevents Valve Closing

If the solenoid plunger moves freely and the flow control is adjusted, the likely cause is a blocked exhaust port under the solenoid. This tiny hole vents water from above the diaphragm when the solenoid energizes. If plugged, the diaphragm stays lifted. Use a magnifying glass and fine wire to clear it, or replace the valve if cleaning is impractical.