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 Botanic Garden >> Gardening >  >> Question and Answer >> Irrigation

System-Wide Low Sprinkler Pressure: Main Valve, Master Valve, or Diaphragm Issues

All Zones Low Pressure; Supply Pressure 100 PSI, Plumber Raised to 120 PSI—No Improvement

  1. Ensure the main irrigation isolation valve (ball or gate) is fully open.
  2. Check for a master valve—if present, its diaphragm may need replacement.
  3. If only some zones are low, rebuild those individual valves (new diaphragm).

Valve rebuild guide at irrigationtutorials.com.

Irrigation
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