Flowserve Spring Diaphragm Rotary Actuators - Manual (Page 11)

11
Spring Diaphragm Rotary Actuators FCD VLAIM050-01 – 05/12
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Troubleshooting Rotary Actuators
Failure Probable Cause Corrective Action
Actuator operates, shaft
does not rotate
1. Broken actuator stem 1. Replace actuator stem
2. Broken clevis (364) or missing snap rings (250) that allowed
pin to move
2. Replace clevis if broken, and make sure the snap
rings are snugly placed into the snap ring groove
3. Torn or broken diaphragm 3. Replace diaphragm
High air consumption
or leakage
1. Leaks in the air supply or instrument signal system 1. Tighten connections and replace any leaking lines
2. Malfunctioning positioner 2. Refer to positioner’s maintenance instructions
3. Broken diaphragm or 0-ring seal 3. Replace diaphragm or 0-ring seal