Flowserve Valtek FlowTop V746 User Instructions page 11

Defect
Jerky stem movement
Stem travel less than full stroke
(0 to 100 %)
Excessive valve seat leakage
Leaking packing box system
Leaking bonnet gasket
Leaking body
No limit switch signal
Unstable positioner
Valtek FlowTop
No. Possible Causes
2.2 • Actuator not powerful enough
3.1 • Air supply pressure too low
3.2 • Pneumatic actuators:
Improper handwheel position
3.3 • Improperly adjusted or defective
positioner
3.4 • Foreign particles in valve seat or
damaged trim
4.1 • Damaged sealing surfaces on
valve seat or plug
4.2 • Foreign particles in seat area
4.3 • Plug does not close fully
5.1 • Compression force on packing box
too low
5.2 • Worn packing
5.3 • Dirty stem
5.4 • Damaged stem
6.1 • Gasket compression is too low
6.2 • Gasket defective
6.3 • Corrosion
7.1 • Corrosion or high velocity related
damage
8.1 • Power supply to limit switch
interrupted
8.2 • Limit switch out of adjustment
9.1 • Defective positioner
Table 8: Trouble-shooting
General Service Valve FCD VLENIM8610A4 11/18
Remedy
• Compare actuator specifications on the serial
plate with operation specifications of the facility. If
incompatible, contact customer service department
or contract partner
• Provide air at the pressure stated on the serial plate
(European production only).
• Move handwheel to limit position , otherwise
contact factory for information.
• Readjust positioner to positioner manufacturer's
specification
• Contact customer service department or contract
partner
• Contact customer service department or contract
partner
• Contact customer service department or contract
partner
• Refer to No. 3.1 to 3.5
• Slightly retighten packing box
NOTICE
Make sure stem can still move.
• Slightly retighten packing box
NOTICE
Make sure stem can still move.
If the packing does not stop leaking, contact
customer service department or contract partner
• Clean stem with suitable cleaning agent
• Contact customer service department or contract
partner
• Properly retighten bonnet bolting nuts crosswise
• Contact customer service department or contract
partner
• Contact customer service department or contract
partner
• Contact customer service department or contract
partner
• Check power supply
(connections, circuit breakers, voltage)
• Readjust limit switch operating distance; see limit
switch data sheet
• See user instruction of the positioner manufacturer
11
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