Flowserve Valtek Spring Cylinder Rotary Actuators - Manual (Page 8)

Failure Probable Cause Corrective Action
Actuator
operates,shaft
does notrotate 1. Broken actuator stem
2. Broken pivot pin
3. Sheared connection at splined lever arm 1. Replace actuator stem
2. Replace pivot pin
3. Replace splined lever arm or valve shaft
Jerky shaft
rotation 1. Cylinder wall not lubricated
2. Worn piston O-ring or load bearing ring,
allowing piston to gall on cylinder wall
3. Worn (or damaged) valve thrust
bearings,
4. Shaft bearings or packing followers
1. Lubricate cylinder with silicone lubricant
2. Replace O-ring or load bearing ring; if
galling has occurred, replace all damaged
parts
3. Disassemble and inspect parts; replace
any worn or damaged parts
High air
consumption or
leakage 1. Leaks in the air supply or instrument
signal system
2. Malfunctioning positioner
3. Leaks through O-rings or adjusting screw
gasket
4. Worn O-rings in sliding stem seal
assembly
1. Tighten connections and replace any
leaking lines
2. Refer to positioner’s maintenance
instructions
3. Replace O-rings or gasket
4. Replace assembly
Troubleshooting Rotary Actuators
VLEEIM031-13 © 2012 Flowserve Corporation. Flowserve Corporation, Valtek Control Products.
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product is designed to perform its intended function safely during its useful life. However, the purchaser or user of Flowserve products should be
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upgrading its product design, the specifications, dimensions and information contained herein are subject to change without notice. Should any
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