Flowserve IOM Control Valves: EN

4.1 Trouble shooting

EN

Defect No. Possiblecauses Remedy

Spindledoesnotmove 1.1

• noaux.energysupply(pneumatic

• pneumaticactuators:checksupplylineforleaks

airorelectricalpower)toactuator

checkpressure(usually6bar)

and accessories (solenoid

valve, lter-reducing station,

• electrical actuators: check power supply

positioner,limitswitchandspecial

(connections,circuitbreakers,voltage)

accessories)

1.2

• thettedaccessoriesdonotwork

• seemaintenanceandoperatinginstructionsof

accessoriesmanufacturer

1.3

• the pneumatic actuator is

• contact customer services department or

defective

contractpartner

1.4

• theelectricalactuatorisdefective

• seemaintenanceandoperatinginstructionsof

actuatormanufacturer

1.5

• excessivetighteningofthestung

• loosen stung box packing nuts until valve

boxpacking

operatesproperly

Caution: make sure there are no leaks!

1.6

• valvetrimworn,stuck

• contact customer services department or

contractpartner

Joltingspindlemovement

2.1

• theelectricalactuatorisdefective

• cleanspindlewithsuitablecleaningagent

2.2

• damagedspindle

• contact customer services department or

contractpartner

2.3

• actuatornotpowerfulenough

• compare actuator specs on the rating plate

with operation specications of the facility

- if incompatible, contact customer services

departmentorcontractpartner

Spindle travel

3.1

• airsupplypressuretoolow

• provideairatthepressurestatedontherating

lessthanfullstroke

plate

(0to100%stroke)

3.2

• pneumatic actuators: bad hand

• movehandwheeltolimitposition

orowrateistoolow

wheel position (hand wheel

emergencyoperation)

3.3

• electrical actuators: limit switch

• readjustlimitswitchtoactuatormanufacturer‘s

misadjusted

specication

3.4

• badly adjusted or defective

• readjustpositionertopositionermanufacturer‘s

positioner

specications

3.5

• foreign particles in valve seat,

• contact customer services department or

damagedtrim

contractpartner

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