Valve Bleed Screw Test Reveals Diaphragm Failure: Replace to Restore Automatic Operation

Valve Works Only When Bleed Screw Is Loose

If opening the bleed screw makes the zone work, but tightening it shuts the zone off, the internal diaphragm is torn or deformed.

Replace the diaphragm (guide at irrigationtutorials.com).

Irrigation: Richdel Valve Thumping and Air in Lines: Diaphragm or Solenoid Port Issue; Hunter Pro-C: Station 1 Runs With All Other Zones; Rain Bird 600: Manual Mode Zone 2 Opens Zone 1 Instead; Sprinklers Weak Until Bleed Valve Opened – Bad Diaphragm; Valves 2 & 4 Low Pressure: Replace Diaphragms, Verify Orientation; How Underground Sprinkler Valve Boxes Stay Securely in Place; Control Valve Won't Shut Off – Replace Valve After Diaphragm Fails; Major Leak at Valve Box: Expose and Repair; New Timer Installed: One Zone Has Lower Pressure Than Manual Operation; Zone Works Manually But Not Electrically: Valve Opening Issue

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