Design 3024S
5
b. Tighten the valve bonnet lock nut.
c. Adjust the travel: rotate the connector halves (key 53
and50)sothatthedistancebetweenthem(withtheplug
ontheseatandthetravelindicatorkey51betweenthe
connectors)isequaltothevalvetravel.
d. Exhaust the actuator slowly and adjust the stem con-
nectorhalf(key50)sotheconnectingboltswilllineup.
e. Completely exhaust the actuator and tighten all bolts
(key 55/56) and nuts (key 56/57).
f. Applyapproximately0.5barabovetheheighestbench
setpressuretothetopofthediaphragmandcheckthe
valvestemtravel.
g. Tightenthevalvestemhexnut(key54/52)againstthe
stem connector (key 50).
For aType3024SAir-To-Open&Air-To-Close
actuators:
5. Cycle the actuator several times to check for proper
operation.
6. Adjustthe travelindicatorscale(key 26)upordown to
correspondwiththetravelindicator.
TravelAdjustments
Althoughmakingtraveladjustmentsshouldnotbeneces-
sary if previous section on Actuator Mounting has been
followed, use the following procedure when the actuator
travelisdifferentfromthatstampedontheactuatorname-
plate(figure2).
Whenadjustingthetravelofapush-down-to-closevalveair-
to-open actuator combination, slightly pressurise the ac-
tuator.Thismovesthevalveplugofftheseat,reducingthe
chanceof damagingthevalveplugor seat during adjust-
ment.
1. Back off the stem hex nut (key 54/52) from the valve
stem connector, and slightly loosen both/all 4 cap
screws (key 55/56) from the connectors.
2. Screw the connector (key 50) clockwise (to lengthen
travel)orcounter-clockwise(toshortentravel).
3. Tighten the stem connector cap screw (key 55/56).
4. Cycletheactuatortocheckforthespecifiedtravel.Ifthe
travel is not equal to the specified travel, adjust and
checkituntilitiscorrect.Tightenthestemhexnut(key
54/52) against the stem connector.
Maintenance
Actuator parts are subject to normal wear and must be
inspected and replaced as necessary. The frequency of
inspectionandreplacementdependsupontheseverityof
the service conditions. Due to the care Fisher takes in
meeting all manufacturing requirements (heat treating,
dimensionaltolerances,etc.),useonlyreplacementparts
manufacturedorfurnishedbyFisher.
Thissectiondescribeshowtheactuatorcanbecompletely
disassembledandassembled.Wheninspectionorrepairs
are required, disassemble only those parts necessary to
accomplish the job; then start the assembly at the appro-
priatestep.
Key numbers refer to figure 6 for a Size 1.21/1.31 Air-To-
Close actuator, to figure 7 for a 1.21/1.31 Air-To-Open
actuator,figure9 for aSize1.41Air-To-Closeactuator,to
figure10for a 1.41Air-To-Openactuator.
Disassembly
Avoid personal injury or damage to prop-
erty from sudden release of pressure, un-
controlledprocessfluid,orprecompressed
springforce.Beforestartingdisassembly:
· Isolate the valve from the process,
· Releaseprocesspressure,
· Ventallinternalpressure from the actua-
tor,
· Release all spring preloading force,
·Use lock-out procedures to be sure that
the above measures stay in effect while
you work on the equipment.
1. For complete disassembly, the positioner and all ac-
cessories (if attached) must be removed from the
actuator.Followtheappropriateremovalproceduresin
theinstructionmanualssuppliedwiththepositionerand
accessories.
2. Bypassthecontrolvalve.Reducetheloadingpres-
suretoatmospheric,andforabottom-loadedType
3024SAir-To-Open actuator,removethetubingor
pipingfromtheconnectioninthelowerdiaphragm
casing (key 1).
Foratop-loadedType3024SAir-To-Closeactuator,
removethepiping or tubing fromtheconnectioninthe
upperdiaphragmcasing(key16).
3. Slightlyloosenalldiaphragmcasingcapscrews(key19
and21).Removetheplastichose(key22).Unscrewthe
shortandlong diaphragmcasingcapscrewsand nuts
(key19,20and21)alternately,untilonlythelongcasing
cap screws (key 21) remain engaged. Then allow the
remainingspringcompressiontobeslowlyandevenly
releasedbyalternatelyunscrewingthelongcasingcap
screws.
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