Troubleshooting Guide; Disposal - Flowserve Valtek VR User Instructions

14. Troubleshooting Guide

Failure
1. Broken actuator stem.
Actuator operates,
lever arm does not
2. Broken pivot pin.
rotate
3. Sheared connection at splined lever arm.
Jerky shaft
1. Cylinder wall not lubricated.
rotation
2. Worn piston O-ring or load bearing ring,
3. Worn (or damaged) valve thrust bearings, shaft
1. Leaks in the air supply or instrument signal
High air
consumption or
leakage
2. Malfunctioning positioner.
3. Leaks through O-rings or adjusting screw
4. Worn O-rings in sliding stem seal

15. Disposal

Up to 95 % of the Valtek VR rotary actuator is metal. The
remaining materials are synthetic, rubber, paint and lubricants.
Potential hazards and their sources are under
the operator's influence. The operator must
observe national and international environmental conditions for
rotary actuator removal from the pipeline and cleaning.
Permissible limit values must be maintained to ensure suitable
protective measures; service personnel must be properly
instructed in performing the disassembly and reassembly
procedure.
VLAIM031-14 (EN/AQ) May 2023
Probable Cause
allowing piston to gall on cylinder wall.
bearings or packing followers.
system.
gasket.
assembly.
Table 2: Troubleshooting recommendations.
Valtek VR Spring Cylinder Rotary Actuators
Corrective Action
1. Replace actuator stem.
2. Replace pivot pin.
3. Replace splined lever arm or valve shaft.
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.
1. Tighten connections and replace any leaking
lines.
2. Refer to positioner's maintenance
instructions.
3. Replace O-rings or gasket.
4. Replace assembly.
The valve should be professionally disassembled and
reassembled. Metal parts should be scrapped, with the
remaining materials disposed of according the national
conditions.
Peripheral units (accessories) should be recycled according the
relevant manufacturer's User Instructions.
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