16 EB 8384-0 EN
Attachment to the control valve – Mounting parts and accessories
4.1.2 Type 3277 Actuator
Refer to Table4 on page32 for the re-
quired mounting parts and accessories listed
with their order numbers.
Refer to travel table on page13.
Actuators with 175 to 750 cm² effective ar-
eas
Mountthepositionerontheyokeasshown
inFig.4.Thesignalpressureisroutedtothe
actuatorovertheconnectionblock(12),for
actuatorswithfail-safeaction"Actuatorstem
extends"internallythroughaholeinthe
valveyokeandfor"Actuatorstemretracts"
throughanexternalpipe.
1. Placefollowerclamp(3)ontheactuator
stem,alignandscrewtightsothatthe
mountingscrewislocatedinthegroove
oftheactuatorstem.
2. Mountcoverplate(10)withnarrowside
ofthecut-outopening(Fig.4,ontheleft)
pointingtowardsthesignalpressurecon-
nection.Makesurethatthebondedgas-
ket(14)pointstowardstheactuator
yoke.
3. For actuators with 355, 700 or
750cm²,removethefollowerpin(2)on
leverM(1)onthebackofthepositioner
frompinposition35,repositionitinthe
holeforpinposition50andscrewtight.
For actuators 175, 240 and 350cm²
with15mmtravel,keepthefollowerpin
(2)inpinposition35.
4. Insertformedseal(15)intothegrooveof
thepositionerhousing.
5. Placepositioneronthecoverplatein
suchamannerthatthefollowerpin(2)
restsonthetopofthefollowerclamp(3).
Adjustthelever(1)correspondinglyand
openthepositionercovertoholdthepo-
sitionershaftinpositionatthecap.The
lever(1)mustrestonthefollowerclamp
withspringforce.
Mountthepositioneronthecoverplate
(10)usingthetwoxingscrews.
6. Makesurethatthetipofthegasket(16)
projectingfromthesideoftheconnec-
tionblockispositionedtomatchtheac-
tuatorsymbolfortheactuator'sfail-safe
action"Actuatorstemextends"or"Actu-
atorstemretracts".Ifthisisnotthecase,
unscrewthethreefasteningscrewsand
liftoffthecover.Turnthegasket(16)by
180°andre-insert.
Theoldconnectionblockversion(Fig.4,
bottom)requirestheswitchplate(13)to
beturnedtoaligntheactuatorsymbol
withthearrowmarking.
7. Placetheconnectionblock(12)withthe
associatedsealsagainstthepositioner
andtheactuatoryokeandfastenusing
thescrew(12.1).Foractuatorswithfail-
safeaction"Actuatorstemretracts",ad-
ditionallyremovethestopper(12.2)and
mounttheexternalsignalpressureline.
8. Mountcover(11)ontheotherside.
Makesurethattheventplugislocatedat
thebottomwhenthecontrolvalveisin-
stalledtoallowanycondensedwater
thatcollectstodrainoff.