Type 3271 and Type 3277 Pneumatic Actuators 3271 and Type 3277 Pneumatic Actuators Actuator areas: 175 and 750 cm² Mounting and Operating Instructions EB 8310-5 EN Edition October

Type 3271 and Type 3277Pneumatic Actuators

Actuator areas: 175 and 750 cm²

Mounting andOperating Instructions

EB 8310-5 ENEdition October 2013

Type 3271 and Type 3277 Pneumatic Actuators

Type 3271 Type 3277

Contents Page

1 Design and principle of operation. . . . . . . . . . . . . . . . . . . . 41.1 Direct attachment in combination with Type 3277 . . . . . . . . . . . . 41.2 Direction of action . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.2.1 Signal pressure routing in Type 3271 . . . . . . . . . . . . . . . . . . 61.2.2 Signal pressure routing in Type 3277 . . . . . . . . . . . . . . . . . . 61.3 Fail-safe action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.3.1 Actuator stem extends . . . . . . . . . . . . . . . . . . . . . . . . . . 61.3.2 Actuator stem retracts . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Type of application . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.1 Throttling service . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.2 On/off service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.1 Standard version . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.2 Version with adjustable mechanical travel stop . . . . . . . . . . . . . . 73.3 Version with handwheel . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84.1 Versions with mechanical travel stop. . . . . . . . . . . . . . . . . . . 84.1.1 Minimum travel limit . . . . . . . . . . . . . . . . . . . . . . . . . . 94.1.2 Maximum travel limit . . . . . . . . . . . . . . . . . . . . . . . . . . 94.2 Version with handwheel . . . . . . . . . . . . . . . . . . . . . . . . 104.2.1 Adjusting the valve travel . . . . . . . . . . . . . . . . . . . . . . . 10

5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115.1 Dissassembling the actuator . . . . . . . . . . . . . . . . . . . . . . 115.1.1 Decompressing preloaded springs . . . . . . . . . . . . . . . . . . . 115.2 Removing the diaphragm plate assembly . . . . . . . . . . . . . . . . 125.3 Dismantling the diaphragm plate assembly . . . . . . . . . . . . . . . 125.4 Assembly (depending on direction of action) . . . . . . . . . . . . . . 135.4.1 Adjusting the position of the slotted nut . . . . . . . . . . . . . . . . . 155.5 Replacing seals and bearings . . . . . . . . . . . . . . . . . . . . . 165.5.1 Type 3271 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165.5.2 Type 3277 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165.5.3 Version with travel stops . . . . . . . . . . . . . . . . . . . . . . . . 175.5.4 Version with handwheel . . . . . . . . . . . . . . . . . . . . . . . . 175.6 Assembling the actuator . . . . . . . . . . . . . . . . . . . . . . . . 18

2 EB 8310-5 EN

Contents

5.7 Reversing the direction of action (fail-safe action) . . . . . . . . . . . . 19

6 Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7 Dimensions and weights. . . . . . . . . . . . . . . . . . . . . . . . 20

8 Customer inquiries . . . . . . . . . . . . . . . . . . . . . . . . . . 21

EB 8310-5 EN 3

Contents

General safety instructions

� The actuators may only be mounted, started up and operated by trainedand experienced personnel familiar with this product.According to these mounting and operating instructions, trained personnelrefers to individuals who are able to judge the work they are assigned toand recognize possible hazards due to their specialized training, theirknowledge and experience as well as their knowledge of the relevant stan-dards.

� Any hazards which could be caused by the signal pressure and movingparts of the actuator are to be prevented by means of appropriate measu-res.

� Proper shipping and appropriate storage are assumed.

1 Design and principle ofoperation

The SAMSON Type 3271 and Type 3277Pneumatic Actuators are mounted onSAMSON Series 240, 250, 280 and 290Valves.

The actuators consist of two diaphragmcases (1 and 2), a rolling diaphragm (4)with diaphragm plate (5) and springs (10).

The signal pressure (S) creates a force at thediaphragm surface which is counteracted bythe springs (10) arranged in the actuator.The number of springs and their compres-

sion determine the bench range (signal pres-sure range) whereby the rated travel is di-rectly proportional to the signal pressure.

A maximum of 19 springs can be installed,partly fitted inside one another.

The stem connector (27) connects the actua-tor stem (7) to the plug stem of the mountedvalve.

1.1 Direct attachment incombination with Type 3277

This actuator version is fitted with an addi-tional yoke on the bottom diapragm case.

4 EB 8310-5 EN

Design and principle of operation

16

110

3336

52

S

4

4240341735

S

7

8

2741

Fig. 1 · Sectional drawing of Type 3271

Actuator stem retracts (air-to-close) Actuator stem extends (air-to-open)(air applied in this diagram)

This yoke is used for direct attachment of apositioner and/or limit switch to protect thetravel pick-off against external influences.

Refer to the mounting and operating instruc-tions of the valve accessories to be mountedfor more details on attachment and the re-quired mounting parts.

1.2 Direction of action

The direction of action is determined by howthe springs and diaphragm plate are ar-ranged in the actuator. For fail-safe action"Actuator stem retracts" (air-to-close), thesignal pressure is connected to the loadingpressure connection on the top diaphragmcase (1) or (75) for the version with mechan-ical travel stop.

EB 8310-5 EN 5


16

1

10

3336

5

22

2

S

4

42

3440

3517

7

8

27

4241

S

Fig. 2 · Sectional drawing of Type 3277

Legend for Figs. 1 and 21 Top diaphragm case2 Bottom diaphragm case4 Diaphragm5 Diaphragm plate7 Actuator stem8 Nut10 Springs16 Vent plug17 O-ring22 Bolt

27 Stem connector33 Nut34 Slotted nut35 Retainer36 Spacing tube40 Shaft sealing ring41 Wiper42 Plain bearingS Loading pressure

connection


For fail-safe action "Actuator stem extends"(air-to-open), the signal pressure is con-nected to the loading pressure connectionon the bottom diaphragm case (2).

The actuators's direction of action can bechanged. To change it, the actuator mustfirst be removed from the valve (refer to sec-tion 5.7 on how to reverse the direction ofaction).

1.2.1 Signal pressure routing inType 3271

In the Type 3271 Actuator with the fail-safeaction "Actuator stem extends"(air-to-open), (Fig. 1, right), the signal pres-sure is connected to the bottom loadingpressure connection (S) to fill the bottom dia-phragm chamber with air, causing the actu-ator stem to move upwards, opposing theforce of the actuator springs.

In the Type 3271 Actuator with the fail-safeaction "Actuator stem retracts" (air-to-close),(Fig. 1, left), the signal pressure is connectedto the top loading pressure connection (S) tofill the top diaphragm chamber with air,causing the actuator stem to movedownwards, opposing the force of the actu-ator springs.

1.2.2 Signal pressure routing inType 3277

In the Type 3277 Actuator with the fail-safeaction "Actuator stem extends"(air-to-open), (Fig. 2, right) the signal pres-sure is connected to the loading pressureconnection at the side of yoke and routedthrough an hole in the yoke to fill the bottom

diaphragm chamber with air, causing theactuator stem to move upwards opposingthe force of the actuator springs.

A positioner can be connected in this caseby using a connection block. Additional pip-ing to the actuator is not required (readpositioner documentation for more details).

In the Type 3277 Actuator with the fail-safeaction "Actuator stem retracts" (fail-to-close)(Fig. 2, left) the signal pressure is connectedto the top loading pressure connection (S) tofill the top diaphragm chamber with air,causing the actuator stem to move down-wards, opposing the force of the actuatorsprings.

1.3 Fail-safe action

When the signal pressure fails, the fail-safeaction of the actuator depends on whetherthe springs are installed in the top or bottomdiaphragm chamber.

1.3.1 Actuator stem extends

When the signal pressure is reduced or theair supply fails, the springs move the actua-tor stem downwards and close the valve.The valve opens when the signal pressure isincreased enough to overcome the force ex-erted by the springs.

1.3.2 Actuator stem retracts

When the signal pressure is reduced or theair supply fails, the springs move the actua-tor stem upwards and open the valve. Thevalve closes when the signal pressure is in-creased enough to overcome the force ex-erted by the springs.

6 EB 8310-5 EN


2 Type of application

Note: Refer to the mounting and operatinginstructions of the corresponding valve formore details on how to mount the actuatoron the valve or how to remove it.

2.1 Throttling service

The Type 3271 and Type 3277 PneumaticActuators are designed for a maximum sup-ply pressure of 6 bar.

2.2 On/off service

To prevent the actuator from being dam-aged, do not let the supply pressure exceedthe upper spring range value by more than3 bar when the actuator is used for on/offservice with the fail-safe action "Actuatorstem retracts" (air-to-close).

Example: Supply pressure in on/off service

Bench range Fail-safe action Max.supply pressure

0.2 to 1.0 barActuator stem

retracts

4 bar

0.4 to 2.0 bar 5 bar

0.6 to 3.0 bar 6 bar

Label actuators that have a reduced supplypressure with a sticker:

"Max. supply pressure limited to ... bar".

The maximum supply pressure for actuatorswith fail-safe action “Actuator stem extends”(air-to-open) and mechanical travel stopsshould not exceed the upper spring rangevalue by more than 1.5 bar.

3 Versions

3.1 Standard version

The pneumatic actuator has an effective dia-phragm area of 175 or 750 cm². The dia-phragm casing (1 and 2) or (75) for the ver-sion with mechanical limit stop (2) are madeof sheet steel with a plastic coating.

3.2 Version with adjustablemechanical travel stop

Type 3271 and Type 3277 Actuators canbe fitted with an adjustable mechanicaltravel stop to limit the minimum and maxi-mum travel.

3.3 Version with handwheel

Type 3271 and Type 3277 Actuators canbe fitted with a handwheel. The handwheelis mounted on the top diaphragm case andis used to adjust the valve travel.

EB 8310-5 EN 7

Type of application

Fig. 3 · Type 3271, 750 cm² diaphragm area withhandwheel

4 Operation

NOTICEOnly apply the signal pressure to the loa-ding pressure connection (S) on the di-aphragm chamber that does not contain thesprings.

The valid bench range or operating signalpressure range with which the actuatormoves through its travel range, is written onthe nameplate.

It is important for a troublefree operation ofthe actuator that the vent plug (16) is notblocked.

4.1 Versions with mechanicaltravel stop

Versions with a mechanical travel stop canbe used to limit the minimum travel, maxi-mum travel or both.

8 EB 8310-5 EN

Operation

78

75

S

5073

70.2

16

77

34

76

70.1

S

Fig. 4 · Type 3271 (partial view) with mechanical travel stop

16 Vent plug34 Slotted nut (top)50 Actuator stem70.1 Lock nut70.2 Lock nut73 Cap75 Top diaphragm case76 Shaft sealing ring77 Dry bearing78 Lock nutS Loading pressure connection

Actuator stem retracts (air-to-close) Actuator stem extends (air-to-open)

4.1.1 Minimum travel limit

1. Undo lock nut (78) and unthread cap(73).

2. Undo lock nut (70.1).3. Move actuator to the minimum travel po-

sition.4. Screw bottom lock nut (70.2) as far as it

will go.5. Hold bottom lock nut (70.2) in place and

use the top nut (70.1) to lock in position.6. If you do not want the actuators's mini-

mum travel to be limited, thread the nuts(70.1 and 70.2) to the bottom of thestem and lock them in place.

7. Screw on cap (73) and retighten lock nut(78).

4.1.2 Maximum travel limit

1. Undo lock nut (78) and unthread cap(73).

2. Move actuator to the maximum travelposition.

3. Screw on cap (73) as far as it will goand refasten using the lock nut (78).

EB 8310-5 EN 9

Operation

4.2 Version with handwheel

4.2.1 Adjusting the valve travel

After undoing the lock nut (66), thehandwheel (60) can be used to adjust thetravel of the valve. Turn the handwheelclockwise to extend the actuator stem.

If the actuator is to be actuated pneumati-cally again, make sure that the pointer (55)points to the groove in the coupling (51).

Relock the handwheel using the lock nut(66).

10 EB 8310-5 EN

Operation

51

55

66

60

1

Fig. 5 · Type 3271 Pneumatic Actuator with handwheel · 175 cm² and 750 cm² diaphragm areas

Type 3271 with 175 cm² diaphragm area Type 3271 with 750 cm² diaphragm area

Legend for Figs. 5 and 61 Top diaphragm case4 Diaphragm5 Diaphragm plate7 Actuator stem8 Nut10 Springs17 O-ring

20 Bolt21 Nut23 Spring adjusting nut25 Washer33 Nut35 Retainer36 Spacing tube

40 Shaft sealing ring42 Plain bearing51 Coupling55 Pointer60 Handwheel66 Lock nut

5 Maintenance

Should the actuator not work properly, youmay need to replace parts that are subject towear.

NOTICESpecial care is required when the actuatorsprings are preloaded.These actuators are labeled accordingly andcan also be recognized by three long boltsprotruding from the bottom diaphragm case.If the actuator is defective and cannot beoperated by applying air to it, the preloa-ded springs must be fully decompressed be-fore removing the actuator!

5.1 Dissassembling the actuator

NOTICEThe lifting ring on the top diaphragm case isonly intended for mounting the pneumaticactuator or removing it from the valve.Do not use the lifting ring to lift the completevalve assembly (actuator and valve).

5.1.1 Decompressing preloadedsprings

1. Undo the nuts (21) from the short bolts(20) on the actuator casing and removethem.

EB 8310-5 EN 11

Maintenance

1

20

2521

10

3336

5

23

22

4

42

403517

S

7

8

Fig. 6 · Opening the Type 3271 Actuator


Bolts used to unload thespring compression!

2. Unthread each nut (23) from the longbolts (22) by a few turns before pro-ceeding to the neighboring nut. Continuethis procedure until the springs are fullydecompressed.

5.2 Removing the diaphragmplate assembly

1. Lift off top diaphragm case (1).2. Remove springs (10) from actuator with

fail-safe action "Actuator stem extends"(air-to-open).

3. Remove diaphgram plate (5) togetherwith the diaphragm (4) and actuatorstem (7) from the bottom diaphragmcase.

4. For actuator with fail-safe action "Actua-tor stem retracts" (air-to-close), removethe now accessible springs.

5.3 Dismantling the diaphragmplate assembly

1. 750 cm² versionPlace a slotted nut wrench on the actua-tor stem (7) to hold the slotted nut sta-tionary.

� 175 cm² versionType 3271: Use a box wrench to holdthe nut on the actuator stem stationary

� Type 3277: Clamp the actuator stem in avise with jaw covers.

2. Dismantle components in the followingorder:

12 EB 8310-5 EN

Maintenance

17

35

7

54

33

3634

17

3534

7

54

33

36

Fig. 7 · Diaphragm plate assembly for air-to-close and air-to-open versions

Actuator stem retracts (air-to-close) Actuator stem extends (air-to-open)

4 Diaphragm5 Diaphragm plate7 Actuator stem17 O-ring33 Nut34 Slotted nut35 Retainer36 Spacing tube

Actuator stem extends/air-to-open

� Nut (33) (or slotted nut (34, top) when atravel stop is fitted)

� Spacing tube (36)

� O-ring (17)

� Diaphragm plate (5) together with dia-phragm (4)

� Retainer (35)

Actuator stem retracts/air-to-close

� Nut (33) (or slotted nut (34, top) when atravel stop is fitted)

� Retainer (35)

� Diaphragm plate (5) together with dia-phragm (4)

� O-ring (17)

� Spacing tube (36)

5.4 Assembly (depending ondirection of action)

Note:We recommend the following tools to as-semble the actuator:Slotted nut wrench Order no. 1280-3197O-ring sleeve Order no. 1280-3198only for 175 cm²: Order no. 1280-3206

Prior to assembly, check all parts for dam-age and renew them, if necessary.

The actuator stem (7) must be undamaged inthe area where it slides on the plain bearing(42) and shaft sealing ring (40).

The arrangement of the components is iden-tical in both Type 3271 and Type 3277Actuators. The actuator's direction of actionis determined by the sequence of assemblyon the actuator stem.

1. 750 cm² version: Place a slotted nutwrench on the actuator stem (7) to holdthe slotted nut stationary.175 cm² version: Use a box wrench tohold the nut on the actuator stem ofType 3271 stationary.Clamp the actuator stem of Type 3277in a vise with jaw covers.

2. Pull the diaphragm (4) onto the dia-phragm plate (5) free of tension.750 cm² version: Make sure that the ele-vations on the diaphragm are alignedwith the centering locations for thesprings on the diaphragm plate.

3. Assemble the components depending onthe direction of action:

EB 8310-5 EN 13

Maintenance

17

3534

7

54

33

36

Fig. 8 · Assembly (actuator stem extends/air-to-open)



� Push the retainer (35) over the slotted nut(34) as illustrated.

� Guide the diaphragm plate (5) togetherwith diaphragm (4) over the actuatorstem, ensuring that the diaphragm is fac-ing down and the spring chamber isaligned with threaded end of the actua-tor stem (facing upward).

� Mount the O-ring (17) using the O-ringsleeve.

� Push spacing tube (36) with its insidechamfer at the front, aligned with theO-ring, onto the actuator stem.

� Thread nut (33) (or slotted nut (34, top)when a travel stop is fitted) onto the actu-ator stem.


� Push spacing tube (36) onto the actuatorstem towards the slotted nut (34), makingsure that the inside chamfer is alignedwith the threaded end of the actuatorstem (facing away from the slotted nut orpointing towards the O-ring).

� Mount the O-ring (17) using the O-ringsleeve (see page 12).

� Guide the diaphragm plate (5) togetherwith diaphragm (4) over the actuatorstem, ensuring that the spring chamber isaligned with the tip of the stem connec-tor.

� Mount the retainer (35).

� Thread nut (33) (or slotted nut (34, top)when a travel stop is fitted) onto the actu-ator stem.

4. Tighten the nut (33) (or slotted nut (34,top) when a travel stop is fitted) usingthe following torque:

� 25 Nm for 175 cm² version� 75 Nm for 750 cm² version.

5. Apply lubricant to the actuator stem inthe area where the plain bearing is lo-cated:

� Version with NBR diaphragm material:lubricant (8152-0043)

� Version with EPDM or PVMQ diaphragmmaterial:lubricant (8150-4009).

14 EB 8310-5 EN

Maintenance

17

35

7

54

33

3634

Fig. 9 · Assembly (actuator stem retracts/air-to-close)


5.4.1 Adjusting the position of theslotted nut

If the slotted nut (34) has been unthreadedfrom the actuator stem (7), e.g. during dis-mantling of the diaphragm plate assembly,follow the instructions below to readjust theposition of the slotted nut:

1. Unthread the slotted nut (34) from theactuator stem (7) and clean boththreads.

2. Thinly apply thread locking agent(8121-3010) to thread area where thenut (34) will be located and mount theslotted nut (34) with its slot facing to-wards the stem connector end of the ac-tuator stem.

3. Adjust the dimension x as shown inFigs. 10 and 11.

Actuator Dimension x [mm] Diaphragmarea

Type 3271 X = 124.2 � 0.1750 cm²

Type 3277 X = 225.2 � 0.1

Type 3271 X = 95 � 0.1 175 cm²

Note: Allow for the thread locking agent toharden before continuing the actuator as-sembly.

EB 8310-5 EN 15

Maintenance

7

34

124,

2±0,

1

Fig. 10 · Adjusting the slotted nut position onType 3271

7

34

225,

2±0,

1

Fig. 11 · Adjusting the slotted nut position onType 3277

X

X

Legend for Figs. 10 and 117 Actuator stem34 Top diaphragm case

5.5 Replacing seals and bearings

Due to wear or during repair work, replacethe shaft sealing ring (40) as well as thewiper (41) and plain bearing (42), ifnecessary.

5.5.1 Type 3271

1. Remove the shaft sealing ring (40) usinga suitable punch or hook.

2. Carefully install the new shaft sealingring, making sure the sealing lip doesnot get damaged.

3. If necessary, replace the wiper (41) andplain bearing (42) using a suitablepunch or piece of pipe.

4. Apply lubricant (8152-0043) to parts(40), (41) and (42).

5. Reassemble actuator as described in sec-tion 5.6.

5.5.2 Type 3277

1. Remove the shaft sealing ring (40) usinga suitable punch or hook.

2. Carefully install the new shaft sealingring, making sure the sealing lip doesnot get damaged.

3. If necessary, replace the wiper (41) andboth plain bearings (42) using a suitablepunch or piece of pipe.

4. Apply lubricant (8152-0043) to parts(40), (41) and (42).

5. Reassemble actuator as described in sec-tion 5.6.

16 EB 8310-5 EN

Maintenance

40

42

7

41

Fig. 12 · Seals and bearings for Type 3271 and Type 3277

4042

4241

7 Actuator stem40 Shaft sealing ring

Type 3271Type 327741 Wiper

42 Plain bearing

5.5.3 Version with travel stops

The Type 3271 and Type 3277 PneumaticActuators can be optionally fitted with a me-chanical travel stop.

A shaft sealing ring and a dry bearing arelocated in the top diaphragm case (75).

1. Undo lock nut (78) and unscrew cap(73).

2. Remove both nuts (70).3. Remove top diaphragm case as de-

scribed in section 5.1.4. Remove shaft sealing ring (76) and/or

dry bearing (77) using a suitable punchor hook.

5. Install new dry bearing using a suitablepiece of pipe.

6. Mount new shaft sealing ring, makingsure the sealing lip does not get dam-aged.

5.5.4 Version with handwheel

1. Undo lock nut (66) and relieve the com-pression of the actuator springs (10, 11)by turning the handwheel (60).

2. Undo thraded pin (63) and unscrewconnection nut (57) from the coupling(51).

EB 8310-5 EN 17

Maintenance

78

73

70.2

77

7675

34

70.1

Fig. 13 · Seals and bearings for travel stop

34 Slotted nut70 Nuts73 Cap75 Top diaphragm case

76 Shaft sealing ring77 Dry bearing78 Lock nut63 Threaded pin66, 70 Lock nuts

60

66

51

59

63

57

8

10,11

Fig. 14 · Handwheel, air-to-open version

8 Nut10, 11 Springs51 Coupling57 Connection nut

59 Yoke60 Handwheel63 Threaded pin66 Lock nut

3. Knock out locking pin (62) and removering (54).

4. Unscrew top slotted round nut (8) and liftoff yoke (59).

5.6 Assembling the actuator

1. Assembly components depending on theactuator's direction of action:


� Clamp bottom diaphragm case (2) in avise.

� Guide ready-assembled actuator steminto the plain bearing (42) of the dia-phragm case (2), making sure that theshaft sealing ring (40) does not getdamaged.

� Insert springs (10) onto the diaphragmplate, centering them in the intended re-cesses.

� Carefully place the top diaphragm case(1) onto it or insert the ready-assembleddiaphragm case (75) for version withtravel stop onto the actuator stem, mak-ing sure that the shaft sealing ring (76)does not get damaged.


� Clamp top diaphragm case (1 or 75) ina vise as shown below. This ensures thatthe position of the springs (10) remainsunchanged.

� Guide ready-assembled actuator stem to-gether with diaphragm plate into the the

18 EB 8310-5 EN

Maintenance

1

10

2

78

27

4240

Fig. 15 · Assembling the actuator

1

102212520

4240

78

27

Actuator stem retracts (air-to-close) Actuator stem extends (air-to-open)1 Top diaphragm case2 Bottomdiaphragm case7 Actuator stem8 Nut10 Springs20 Bolt

21 Nut25 Washer27 Clip40 Shaft sealing ring42 Plain bearing

top diaphragm case (1) or into theready-assembled diaphragm case (75)for version with travel stop, making surethat the shaft sealing ring (76) does notget damaged.

� Insert springs (10) onto the diaphragmplate, centering them in the intended re-cesses.

� Carefully push the bottom diaphragmcase (2) together with plain bearing overthe actuator stem, making sure that theshaft sealing ring (40) does not get dam-aged.

2. Align holes of diaphragm.3. Align air connections to ensure that they

are arranged above each other on thesame side.

4. If necessary, insert required clampingbolts (22) through the holes in the dia-phragm cases and thread nuts (23) withwashers until they rest on the diaphragmcase.Hold bolt heads stationary and tightennuts in an even pattern until the dia-phragm is clamped between both dia-phragm cases.

5. Insert the short clamping bolts and at-tach nuts (21) and washers (25).

6. Tighten all nuts with 12 Nm (175 cm²)or 25 Nm (750 cm²) in a criss-crosspattern.

7. Mount the actuator onto the valve follow-ing instructions in the mounting and op-erating instructions of the valve.Tighten the fastening nut (8) with atorque of 150 Nm on mounting theactuator.

5.7 Reversing the direction ofaction (fail-safe action)

The direction of action, i.e. fail-safe action,of pneumatic actuators can be changed.Prior to proceeding, the actuator must firstremoved from the valve (read mounting andoperating instructions of the associatedvalve).

The currently valid fail-safe action "Actuatorstem extends" or "Actuator stem retracts" isspecified on the nameplate by the corre-sponding symbol.

Remove the handwheel parts of actuatorswith handwheel as described in section5.5.4.

1. Disassemble the actuator and dia-phragm plate assembly as described insections 5.1 to 5.3.

2. Assemble the diaphgram plate assemblyas described in section 5.4 dependingon the direction of action.

3. Assemble the actuator as described insection 5.6.

Note: Mark the changed fail-safe action onthe nameplate!

EB 8310-5 EN 19

Maintenance

6 Nameplate

The plastic nameplates for Type 3271 andType 3277 Pneumatic Actuators are stuckon the diaphragm case. They include all de-tails required to identify the actuator:

� Manufacturer and model type

� Configuration ID (Var-ID) as bar codeand in plain text

� Serial number

� Country of origin

� Diaphragm area in cm²

� Diaphragm material NBR, EPDM orPVMQ

� Symbol indicating fail-safe action

� Bench range in bar und psi

� Symbol indicating operating travel inmm

� Signal range with preloaded springs

� Thread for pneumatic connection in G,NPT or Rc

� Permissible supply pressure pmax in barand psi

7 Dimensions and weights

Refer to the Data SheetsT 8310-1/-4/-5/-6 EN for Type 3271 orType 3277 Actuator with 175 or 750 cm²effective diaphragm area for dimensionsand weights.

20 EB 8310-5 EN

Nameplate

350 cm² 1.5 ... 2.7 bar22 ... 39 psi

15 mm

906

SAMSON 3271

Made in Germany

Var-ID12341 2 3 4 5 6 7

Serial no.maxp bar / psi

2.0 ... 2.7 bar29 ... 39 psi

G

��NBR-

Fig. 16 · Nameplate 350 cm²

175 cm²

8 Customer inquiries

Please specify the following details on mak-ing inquiries:

� Type und model number

� Effective diaphragm area

� Bench range (spring range) in bar

� Actuator version and direction of action

� Your e-mail address

Please send your inquiries to:[email protected]

Tools

Slotted nut wrench Order no. 1280-3197

O-ring sleeve Order no. 1280-3198only for 175 cm² Order no. 1280-3206

EB 8310-5 EN 21

Customer inquiries

22 EB 8310-5 EN

EB 8310-5 EN 23

SAMSON AG · MESS- UND REGELTECHNIKWeismüllerstraße 3 · 60314 Frankfurt am Main · GermanyPhone: +49 69 4009-0 · Fax: +49 69 4009-1507Internet: http://www.samson.de EB 8310-5 EN 20

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Type 3271 and Type 3277 Pneumatic Actuators 3271 and Type 3277 Pneumatic Actuators Actuator areas: 175 and 750 cm² Mounting and Operating Instructions EB 8310-5 EN Edition October

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