FlowAct Diaphragm Linear Actuator FCD VLENIMFACTA4 10/16
13
flowserve.com
Defect
No.
Possible Causes
Remedy
Jerky stem movement
2.1
• Damaged stem
• Contact customer service department or contract
partner
2.2
• Actuator not powerful enough
• Compare actuator specifications on the serial
plate with operation specifications of the facility. If
incompatible, contact customer service department
or contract partner
Stem travel less than full stroke
(0 to 100 %)
3.1
• Air supply pressure too low
• Provide air at the pressure stated on the serial plate
(European production only).
3.2
• Pneumatic actuators:
Improper handwheel position
• Move handwheel to limit position , otherwise
contact factory for information.
3.3
• Improperly adjusted or defective
positioner
• Readjust positioner to positioner manufacturer‘s
specification
3.4
• Foreign particles in valve seat or
damaged trim
• Contact customer service department or contract
partner
No limit switch signal
4.1
• Power supply to limit switch
interrupted
• Check power supply
(connections, circuit breakers, voltage)
4.2
• Limit switch out of adjustment
• Readjust limit switch operating distance; see limit
switch data sheet
Unstable positioner
5.1
• Defective positioner
• See user instruction of the positioner manufacturer
Table 8: Trouble-shooting
15 Disassembly and Reassembly
The FlowAct linear actuator is allowed to be disassembled and reassembled only by qualified staff
- personnel who are familiar with disassembling, reassembling, installation and commissioning
of this product, and possess the relevant qualifications in their field of activity.
14 Operation of the handwheel
WARNING
Due to risk of crushing hazard,
do not work with the handwheel
during regular operation. Actuation is only permitted with
separated air supply !
1. The handwheel is always in the neutral position in the
delivery condition.
2. The handwheel are designed to act against the fail
safety position of the actuator. That means in the
case of an pneumatic actuator design with restoring
springs.
NOTICE
When adjusting, then the handwheel
press against the spring force - with-
out the actuator the handwheel has no function.
3. All handwheel designs are immediately ready for use,
except the lateral handwheel for the 1502 and 3002
actuator. In the event of fail safe position - spring-to-
open (retracted) - before using, the handwheel must
turned counterclockwise up to contact the drive pin the
coupling and subsequently locked.
4. Check the progress of the stroke adjustment on the
stroke indicator scale.
5. If normal operation is to be resumed, the handwheel
must be turned always to the neutral position.
