Samson 3372 Service manual

Mounting and
Operating Instructions
EB 8313-3 EN
Edition July 2013
Type 3372 Electropneumatic Actuator
Versions with 120 and 350 cm²
and Type 3725 Positioner
Globe valve with Type 3372 Electropneumatic Actuator
Versions with 120 cm² and 350 cm² effective diaphragm areas

Denition of signal words
DANGER!
Hazardous situations which, if not
avoided, will result in death or seri-
ous injury
WARNING!
Hazardous situations which, if not
avoided, could result in death or seri-
ous injury
NOTICE
Property damage message or mal-
function
Note:
Additional information
Tip:
Recommended action

2 EB 8313-3 EN

Contents
EB 8313-3 EN 3
1 General safety instructions.............................................................................7
2 Design and principle of operation ..................................................................8
2.1 Versions ........................................................................................................8
2.1.1 Type 3372 (120 cm²) .....................................................................................8
2.1.2 Type 3372 (350 cm²) .....................................................................................8
2.2 Signal pressure routing.................................................................................12
2.2.1 Version with fail-safe action „actuator stem extends“ (FA)................................12
2.2.2 Version with fail-safe action „actuator stem retracts“ (FE).................................12
2.3 Fail-safe action ............................................................................................13
2.3.1 Version with fail-safe action “actuator stem extends“ (FA) ................................13
2.3.2 Version with fail-safe action “actuator stem retracts“ (FE).................................13
2.4 Technical data .............................................................................................14
3 Application .................................................................................................14
3.1 Throttling service..........................................................................................15
3.2 On/off service.............................................................................................15
4 Mounting on the valve.................................................................................16
4.1 Type 3372 (120 cm²) ...................................................................................16
4.1.1 Mounting using a central nut.........................................................................16
4.1.2 Mounting using rods ....................................................................................18
4.2 Type 3372 (350 cm²) – mounting using rods..................................................18
4.3 Changing the type of mounting.....................................................................20
4.3.1 Conversion of mounting using a central nut to rods.........................................20
4.3.2 Conversion of mounting using rods to a central nut.........................................20
4.4 AttachingtheType3725Positioner ...............................................................22
4.4.1 Actuator with fail-safe action „actuator stem extends“ (FA) ..............................22
4.4.2 Actuator with fail-safe action „actuator stem retracts“ (FE) ...............................22
4.5 AttachingtheType4744-2LimitSwitch .........................................................24
5 Operation...................................................................................................25
5.1 Type 3372 (120 cm²) with travel stop ............................................................25
5.1.1 Limitingtheminimumtravel ..........................................................................25
5.1.2 Limitingthemaximumtravel..........................................................................26
5.2 Type 3372 (120 cm²) with manual override ...................................................26
5.2.1 Actuator with fail-safe action „actuator stem extends“ (FA) ..............................26
5.2.2 Actuator with fail-safe action „actuator stem retracts“ (FE) ...............................26

4 EB 8313-3 EN
Contents
6 Maintenance of Type 3372 (120 cm²)...........................................................28
6.1 Removing the actuator..................................................................................28
6.1.1 Releasing the spring preloading ....................................................................28
6.2 Removing the diaphragm plate assembly .......................................................28
6.3 Dismantling the diaphragm plate assembly ....................................................30
6.3.1 Version with fail-safe action „actuator stem extends“ (FA)................................30
6.3.2 Version with fail-safe action „actuator stem retracts“ (FE).................................30
6.4 Assembly based on the direction of action .....................................................30
6.4.1 Version with fail-safe action „actuator stem extends“ (FA)................................30
6.4.2 Version with fail-safe action „actuator stem retracts“ (FE).................................30
6.5 Replacing seals and plain bearings ...............................................................30
6.5.1 Radial shaft seal, wiper ring and plain bearings.............................................31
6.5.2 Version with travel stop.................................................................................31
6.5.3 Version with manual override........................................................................32
6.6 Mounting the actuator ..................................................................................33
6.6.1 Version with fail-safe action „actuator stem extends“ (FA)................................33
6.6.2 Version with fail-safe action „actuator stem retracts“ (FE).................................33
6.6.3 Assembling the diaphragm cases ..................................................................33
6.7 Mounting on the valve..................................................................................34
7 Maintenance of Type 3372 (350 cm²)...........................................................36
7.1 Removing the actuator..................................................................................36
7.1.1 Reducing the spring preloading.....................................................................36
7.2 Removing the diaphragm plate assembly .......................................................36
7.3 Dismantling the diaphragm plate assembly ....................................................38
7.3.1 Version with fail-safe action „actuator stem extends“ (FA)................................38
7.3.2 Version with fail-safe action „actuator stem retracts“ (FE).................................38
7.4 Assembly based on the direction of action .....................................................38
7.4.1 Version with fail-safe action „actuator stem extends“ (FA)................................38
7.4.2 Version with fail-safe action „actuator stem retracts“ (FE).................................38
7.5 Replacing seals and plain bearing.................................................................39
7.5.1 Radial shaft seal, wiper ring and plain bearing..............................................39
7.6 Mounting on the valve..................................................................................39
7.7 Connections.................................................................................................39
8 Reversing the direction of action (fail-safe action)..........................................39

EB 8313-3 EN 5
Contents
9 Nameplate..................................................................................................40
10 Dimensions and weights..............................................................................40
11 Customer inquiries ......................................................................................41

EB 8313-3 EN 7
General safety instructions
1 General safety instructions
−The actuator is to be mounted, started up or operated only by trained and experienced
personnel familiar with the product. According to these mounting and operating instruc-
tions, trained personnel refers to individuals who are able to judge the work they are as-
signed to and recognize possible dangers due to their specialized training, their knowl-
edge and experience as well as their knowledge of the applicable standards.
−Explosion-protected versions of this actuator are to be operated only by personnel who
has undergone special training or instructions or who is authorized to work on explosion-
protected devices in hazardous areas.
−Any hazards that could be caused in the valve by the process medium, the signal pres-
sure or by moving parts are to be prevented by means of the appropriate measures.
−If inadmissible motions or forces are produced in the pneumatic actuator as a result of
the supply pressure level, it must be restricted using a suitable supply pressure reducing
station.
−Proper shipping and storage are assumed.
Note:
The actuator with a CE marking fullls the requirements of the Directive 94/9/EC and
the Directive 2004/108/EC.
The Declaration of Conformity is available on request.


8 EB 8313-3 EN
Design and principle of operation
2 Design and principle of oper-
ation
TheType3372ElectropneumaticActuatoris
mainly used for attachment to Series V2001
Valves:
−Type 3321 Globe Valve
−Type 3323 Three-way Valve
−Type3531GlobeValveforHeatTransfer
Oil
−Type3535Three-wayValveforHeat
Transfer Oil
The actuator mainly consists of two dia-
phragm cases (1 and 2) with a diaphragm
(4) and internal springs (10). The actuator is
connected to the valve bonnet by a rod-type
yoke.TheType3725ElectropneumaticPosi-
tioner is attached to the rod (33) with the
largest diameter using a support element
(61). This positioner converts the control sig-
nal received from a control system (4 to
20mAreferencevariable)intoaproportion-
al pressure signal.
The signal pressure (pst, S port) creates a
force at the diaphragm surface which is op-
posed by the compression springs (10) in the
actuator. The number of springs and their
compression determine the bench range (sig-
nal pressure range). The travel is always pro-
portional to the signal pressure.
The stem connector connects the actuator
stem (7) to the plug stem of the mounted
valve.
2.1 Versions
2.1.1 Type 3372 (120 cm²)
−Actuator with die-cast aluminum housing
−Standard use for attachment to
Type3321andType3323Valvesin
DN15to50aswellasType3531and
Type3535ValvesinDN15to80(corre-
spondstoFormBinTable1).
Optionally,theactuatorcanbettedwitha
mechanically adjustable travel stop or a
manual override.
2.1.2 Type 3372 (350 cm²)
−Actuator with sheet steel housing (see
Fig.1)
−Standard use for attachment to
Type3321ValvesinDN65to100as
wellasType3323ValvesinDN65to
100for15or30mmtravel(corresponds
toFormCinTable1).
Thisactuatorversioncannotbettedwitha
manual override or travel stop.

EB 8313-3 EN 9
Design and principle of operation
1
15
27
25
20
21
4
5
10
40
42
41
7
33
60
54
2
61
1/2 Diaphragm case
4 Diaphragm
5 Diaphragm plate
7 Actuator stem
10 Compression spring
15 Collar nut
20 Hexagonbolt
21 Hexagonnut
25 Washer
27 Compressor
33 Rod
40 Radial shaft seal
41 Wiper ring
42 Plain bearing
54 Hexagonnut(for33)
60 Plate
61 Support element
Fig.1: Type 3372 Actuator (350 cm²)

10 EB 8313-3 EN
Design and principle of operation
Table1: Attachment of Type 3372 Actuator to Series V2001 Valves
120 cm²
350 cm²
Stem extends Stem retracts
Stem
extends
Stem
retracts
Stem
extends
Stem
retracts
2.1 to 3.3 1.4 to 2.3 0.4 to 1.4 1.4 to 2.3
2.1 to 2.7 1.5 to 2.1 2.2 to 3.8 1.5 to 2.7
Type DN KVS Travel 15 mm
15 mm 30 mm KVS DN Type
3321 15 to 50 0.25 to 35
15 mm
BBBB
– – – – 0.25 to 35 15 to 50 3321
3321 65 to 100 40 to 100 C* – C* –
C C – – 40 to 100 65 to 100 3321
3323 15 to 50 4 to 32 – B – B
– – – – 4 to 32 15 to 50 3323
3323 65 to 80 60 to 80 – – – –
C C – – 60 to 80 65 to 80 3323
3321 100 160 30 mm ––––
– – C C 160 100 3321
3323 100 160 – – – –
– – C C 160 100 3323
3531 15 to 80 1.6 to 80 15 mm BBBB
– – – – 1.6 to 80 15 to 80 3531
3535 15 to 80 4 to 80 B B B B
– – – – 4 to 80 15 to 80 3535
* SeeFig.7
Form B attachment (mounting using a central nut)
Form C attachment (mounting using rods)