Mounting and Operating Instructions

EB 8315 EN Edition October 2014

Type 3379 Pneumatic Actuator

Definition of signal words

DANGER!Hazardous situations which, if not avoided, will result in death or serious injury

WARNING!Hazardous situations which, if not avoided, could result in death or seri-ous injury

NOTICEProperty damage message or mal-function

Note:Additional information

Tip:Recommended action

2 EB 8315 EN

Contents

EB 8315 EN 3

1 General safety instructions .............................................................................52 Design and principle of operation ..................................................................62.1 Versions ........................................................................................................62.2 Operating direction ........................................................................................62.3 Fail-safe action ..............................................................................................62.4 Technical data ...............................................................................................83 Installation ..................................................................................................103.1 Pneumatic connections..................................................................................103.2 Replacing the actuator ..................................................................................103.3 Aligning the actuator ....................................................................................103.4 Removing and exchanging the actuator bonnet ..............................................123.4.1 Removing the cover ......................................................................................133.4.2 RemovingtheType 4740LimitSwitch ............................................................133.4.3 RemovingtheType 3724Positioner ...............................................................134 Dimensions in mm .......................................................................................14

EB 8315 EN 5

General safety instructions

1 General safety instructionsForyourownsafety,followtheseinstructionsconcerningthemounting,startupandopera-tion of the actuator: − Theactuatoristobemounted,starteduporoperatedonlybytrainedandexperiencedpersonnelfamiliarwiththeproduct.

− Accordingtothesemountingandoperatinginstructions,trainedpersonnelreferstoindi-vidualswhoareabletojudgetheworktheyareassignedtoandrecognizepossibledan-gersduetotheirspecializedtraining,theirknowledgeandexperienceaswellastheirknowledgeoftheapplicablestandards.

− Anyhazardsthatcouldbecausedbythesignalpressureormovingpartsoftheactuatoraretobepreventedbytakingappropriateprecautions.

Toavoiddamagetoanyequipment,thefollowingalsoapplies: − Proper shipping and storage are assumed.

6 EB 8315 EN

Design and principle of operation

2 Design and principle of oper-ation

TheType3379PneumaticActuator(withspring-returnmechanism)isusedinconjunc-tionwithavalvesuitableforthefoodandpharmaceutical industries.

Principle of operation (Fig. 1)The signal pressure pst creates a force on the pistonsurface(5)whichiscounteractedbythespring(s)(4).Thebenchrangeisdeter-mined by the number of springs used and theircompression,takingintoaccounttherated travel.The actuators are designed for a maximum travelof15 mm.Aspringcompressionisonlypossiblewithsmallertravels.The travel H is proportional to the signal pressure pst. The operating direction of the actuatorstemdependsonhowthespringsare installed in the actuator.The supply air is connected for both operat-ing directions to the top connecting plate.Theconnectionbetweentheactuatorstemand the valve's plug stem differs depending on the valve used. Refer to the mounting and operating instructions of the corresponding valve for more details.

2.1 Versions − Type 3379-00:Type3379ActuatorcombinedwithType 3724Electropneu-maticPositioner(uEB 8395 EN)

− Type 3379-01:Type3379Actuatorforon/off service

− Type 3379-02:Type3379ActuatorcombinedwithType 4740ElectricLimitSwitch

2.2 Operating directionThe operating direction is determined by howthespringsarearrangedintheactuatoranditsinternaldesign(seeFig.1): − Actuator stem retracts − Actuator stem extends

Note:It is not possible to reverse the operat-ing direction.

2.3 Fail-safe actionDepending on the operating direction of the actuator,theactuatorhasdifferentfail-safeactions effective upon air supply failure.Actuator stem extends (fail-close):Whentheairsupplyfails,thespringforcemovesthestemdownwardscausingthevalve to close.

Actuator stem retracts (fail-open):Whentheairsupplyfails,thespringforcemovesthestemupwardscausingthevalvetoopen.

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Design and principle of operation

3

10

9

8

5

2

7

4

6

3

1 1

1 Pressure connection to control the actuator2 Piston seal3 Vent plug4 Spring(s)5 Piston6 Base7 Actuatorstem8 Cover9 Positionindicator(valveOPEN/CLOSED)10 Dome

Actuator stem retracts (fail-open)

Actuator stem extends (fail-close)

Fig. 1: Sectional drawings of Type 3379

8 EB 8315 EN

Design and principle of operation

2.4 Technical data

Table 1: General data

Piston diameter mm 63 90

in 2.48 3.54

Effective area cm² 31 63

in² 4.8 9.8

Rated travel mm 15 15

in 0.59 0.59

Permissible ambient temperature

°C 0 to +60 0 to +60

°F +32 to +140 +32 to +140

Max. supply pressure bar 8 8

psi 116 116

Hysteresis bar 0.4 0.3/0.5/0.6 1)

psi 6 4.3/7.2/8.7

1) Dependingonadjustedspringrange

Table 2: Fail-close version

Piston diameter mm 63 90

in 2.48 3.54

Effective area cm² 31 63

in² 4.8 9.8

No.ofsprings 1 1 2

Control pressure bar 4 4.5 6

psi 58 65 87

Nominalrange bar 2.3to3.7 2.5to4.0 3.3to5.6

psi 34to54 36to58 48 to 81

Travel mm 15 15 15

in 0.59 0.59 0.59

Thrust N 720 930 1590 2030 2090 2670

lbf 162 209 357 456 470 600

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Design and principle of operation

Table 3: Fail-open version

Piston diameter mm 63 90

in 2.48 3.54

Effective area cm² 31 63

in² 4.8 9.8

No.ofsprings 1 1 1

Control pressure bar 6 6 4

psi 87 87 58

Nominalrange bar 2.3to3.7 1.0to1.9 1.0to1.9

psi 34to54 15to28 15to28

Travel mm 15 15 15

in 0.59 0.59 0.59

Thrust N 720 930 2580 2830 1320 1570

lbf 162 209 580 636 297 353

Table 4: Materials

Component Material

Housing and cover Stainlesssteel1.4404(316L)/1.4409(CF3M)

Piston rod 1.4404(316L)

Piston Polyamide,glassfiberreinforced

Dome(visualindicator) Polycarbonate

Bearing Polymer

Springs Springsteel,powdercoated

Seals NBR

Table 5: WeightPiston diameter mm 63 mm 90 mm

in 2.48 3.54

Weight(approx.) kg 2.5 3.5

lb 5.5 7.7

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Installation

3 InstallationAllversionsoftheType 3379PneumaticPis-ton Actuator are delivered ready-mounted onthevalve.Tostartuptheactuator,per-formthepneumaticconnectionsand,inver-sionswithpositionerorlimitswitch,alsoconnecttheelectricwiring.Further information:Connection of the Type 3724 PositionerSeeuEB8395ENConnection of the Type 4740 Limit SwitchSeeuEB8357EN

3.1 Pneumatic connectionsThecustomaryfittingsformetalandcopperpipes or plastic hoses can be used to connect the supply air.Theexhaustairportisdeliveredfittedwithasilencer.Inversionswithapositioner,thisportisfittedwithastainlesssteelcheckvalve.

3.2 Replacing the actuatorTheproceduretoremoveandmountanewactuator is described in the mounting and operating instructions of the corresponding valve.

3.3 Aligning the actuatorDependingonthemountingposition,itmaybe necessary to align the position of the pneumaticconnections.Proceedasfollows(Fig.2):For fail-open version:1. Extendtheactuatorstem.2. Pusharodwith2.5 mmdiameterora

similarobject,e.g.ascrewdriverorSAMSONtool 1) through the holes on the actuator base to secure the actuator stem.

3. Insertsuitableobject,e.g.threadedrodorSAMSONtool2) into the exhaust air connection of the actuator and turn the actuator bonnet clockwise until the pneu-matic connections are in the required po-sition.

For fail-close version:1. Pusharodwith2.5 mmdiameterora

similarobject,e.g.ascrewdriverorSAMSONtool 1) through the holes on the actuator base to secure the actuator stem.

2. Insertsuitableobject,e.g.threadedrodorSAMSONtool2) into the supply con-nection of the actuator and turn the actu-ator bonnet clockwise until the pneumat-ic connections are in the required posi-tion.

1) Orderno.1281-00692) Orderno.1281-0067forØ 63 mmactuator,orderno.1281-0068forØ 90 mmactuator

EB 8315 EN 11

Installation

Securetheactuatorstemwithrodwith2.5 mmdiameterorSAMSONtool (orderno.1281-0069)

ThreadedrodorSAMSONtool, orderno.1281-0067(forØ 63 mm)orderno.1281-0068(forØ 90 mm)

Turnclockwise

Fig. 2: Aligning the actuator

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Installation

3.4 Removing and exchanging the actuator bonnet

WARNING!Risk of injury due to compressed springs!Do not dismantle the actuator!

Fig.3showsthedifferentcombinations(ac-tuatorwithlimitswitchandactuatorwithpo-sitioner).TheType 4740LimitSwitchismounted on the cover of the actuator. The Type 3724Positionerismountedwithoutac-tuator cover directly to the basic module of the actuator.

Type4740LimitSwitchType3724Positioner

Fig. 3: Type 3379 Actuator combined with Type 4740 Limit Switch and Type 3724 Positioner

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Installation

Iftheactuatoristobereplacedorupgraded,removethebonnet(cover,positionerorlimitswitch)oftheactuator.MakesurethattheO-ringandmoldedsealarereinsertedcorrectlyafterreassembly(Fig.4).

O-ring

Molded seal

Specialscrew

Fig. 4: Installation

3.4.1 Removing the cover1. Unscrewdome(visualindicator).2. Unthreadbothhexagonsocketscrews.3. Remove the cover.

3.4.2 Removing the Type 4740 Limit Switch

1. Removethelimitswitchasdescribedinthe Mounting and Operating Instructions uEB8357EN.

2. The cover remains on the basis module.

3.4.3 Removing the Type 3724 Positioner

1. Remove the positioner as described in the Mounting and Operating Instructions u EB8395EN.

2. Ifnecessary,unscrewthespecialscrew(belongingtothepositioner).

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Dimensions in mm

4 Dimensions in mm

Ø69 (2.72)

30 (1

.18)

35 (1

.38)

53.5 (2.11)

193

(7.6

)

Ø94 (3.7)

35 (1

.38)

193

(7.6

)

67 (2.64)

30 (1

.18)

Ø45 (1.77) Ø45 (1.77)

Ø 90 mm actuator sizeØ 63 mm actuator size

Fig. 5: Dimensional diagram of Type 3379-01 Actuator

Specificationsinparentheses: Dimensions in inches

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Dimensions in mm

300

(11.

8)

142

(5.6

)

Ø45 (1.77)

30 (1

.18)

Ø69/94 (2.72/3.7)

Fig. 6: Dimensional diagram of Type 3379-02 Actuator

Specificationsinparentheses: Dimensions in inches

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Dimensions in mm

285

(11.

22)

135 (5.31)

Ø108 (4.25)

Ø69/94 (2.72/ 3.7)

130

(5.1

2)

Fig. 7: Dimensional diagram of Type 3379-00 Actuator

Specificationsinparentheses: Dimensions in inches

SAMSON AG · MESS- UND REGELTECHNIKWeismüllerstraße 3 · 60314 Frankfurt am Main, GermanyPhone: +49 69 4009-0 · Fax: +49 69 4009-1507samson@samson.de · www.samson.de EB 8315 EN 20

14-10-24·English