Flowserve IOM Control Valves - Manual (Page 23)

EN
4.1 Trouble shooting
Defect No. Possible causes Remedy
Spindle does not move 1.1
1.2
1.3
1.4
1.5
1.6
• no aux. energy supply (pneumatic
air or electrical power) to actuator
and accessories (solenoid
valve, filter-reducing station,
positioner, limit switch and special
accessories)
• the fitted accessories do not work
• the pneumatic actuator is
defective
• the electrical actuator is defective
• excessive tightening of the stuffing
box packing
• valve trim worn, stuck
• pneumatic actuators: check supply line for leaks
check pressure (usually 6 bar)
• electrical actuators: check power supply
(connections, circuit breakers, voltage)
• see maintenance and operating instructions of
accessories manufacturer
• contact customer services department or
contract partner
• see maintenance and operating instructions of
actuator manufacturer
• loosen stuffing box packing nuts until valve
operates properly
Caution: make sure there are no leaks!
• contact customer services department or
contract partner
Jolting spindle movement 2.1
2.2
2.3
• the electrical actuator is defective
• damaged spindle
• actuator not powerful enough
• clean spindle with suitable cleaning agent
• contact customer services department or
contract partner
• compare actuator specs on the rating plate
with operation specifications of the facility
- if incompatible, contact customer services
department or contract partner
Spindle travel
less than full stroke
(0 to 100% stroke)
or flow rate is too low
3.1
3.2
3.3
3.4
3.5
• air supply pressure too low
• pneumatic actuators: bad hand
wheel position (hand wheel
emergency operation)
• electrical actuators: limit switch
misadjusted
• badly adjusted or defective
positioner
• foreign particles in valve seat,
damaged trim
• provide air at the pressure stated on the rating
plate
• move hand wheel to limit position
• readjust limit switch to actuator manufacturer‘s
specification
• readjust positioner to positioner manufacturer‘s
specifications
• contact customer services department or
contract partner