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

Low Pressure on One Station of Six

One of six stations has low pressure.

99% Chance: Bad Diaphragm

Test by opening the valve's bleed screw manually. If valve doesn't open or requires bleed screw nearly fully out, diaphragm is bad. Alternative test: shut off main, unscrew solenoid, turn water on—steady stream from solenoid port means valve should open. If not, diaphragm or seat issue. Line breaks or too many heads would show water elsewhere.

Irrigation: Low Pressure in Auto Mode Only: Richdel Valve Diaphragm Replacement; System-Wide Low Sprinkler Pressure: Main Valve, Master Valve, or Diaphragm Issues; Sudden Low Pressure on One Station – Break, Blockage, or Valve Issue; Low Pressure on Auto, Full Pressure Manual Bleed – Diaphragm or Solenoid Port; Low Pressure at Drippers – Pressure Regulator Likely Faulty; Low Pressure After Raising Risers – Leak or Diaphragm; Sudden Low Pressure on All Zones: Front and Back Yard; Low Pressure After City Gravity Conversion: Booster Pump Solution; One Zone Lost Pressure: Hardie Valve Diaphragm Likely Culprit; Managing High Water Pressure in Sprinkler Systems: Why You Need a Pressure Regulator

Garden Articles

Rain Bird 600: Manual Mode Zone 2 Opens Zone 1 Instead

Sprinklers Weak Until Bleed Valve Opened – Bad Diaphragm

Hodrotek 6000 Low Pressure on All Zones: Pump Performance or Valve Leakage?

Solving Low Pressure in a Watermiser Drip Valve Caused by Anti-Siphon Pinhole Leak

Low Pressure All Zones After Winter: Systematic Diagnosis

Electrically Actuated Valves for Ultra-Low Pressure Rain Barrel Systems

Zone Works Manually But Not Electrically: Valve Opening Issue

Plants

Water Master 57161: Valve Turns On Briefly Then Repeats Every Minute

Zone 3 Only Runs with Bleed Open: Troubleshoot Voltage & Diaphragm

Troubleshooting Low Water Pressure in Two Irrigation Stations

Low-Pressure Valve for Gravity-Fed Drip System (Under 5 PSI)

Major Leak at Valve Box: Expose and Repair

Low Pressure on One Sprinkler Zone: Valve Adjustment and Cleaning

Diagnosing System-Wide Pressure Loss When Irrigation Runs