Flowserve V901 VariCool Desuperheater - Manual (Page 7)

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4 Trouble shooting
Defect No. Possible cause 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 service
departement 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 service
departement or contract partner
Jolting spindle movement
2.1
2.2
2.3
• dirty spindle
•
damaged spindle
• actuator not powerful enough
•
clean spindle with suitable cleaning
agent
• contact customer service department
or a contract partner
• compare actuator specs on the
rating plate with operation
specifications of the facility - if
incompatible, contact customer
service department or
contract
partner
Spindle travel less than full
stroke
( 0 to 100% stroke )
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
• take hand wheel to limit position
• readjust limit switch to actuator manu
facturer`s specifications
• readjust positioner to positioner
manu facturer`s specifications
• contact customer services
department or
contract partner