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)

EB 8313-3 EN 11
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)

12 EB 8313-3 EN
Design and principle of operation
2.2 Signal pressure routing
ThesignalpressureoftheType3725Posi-
tioner (62) is routed through the correspond-
ing port in the support element (61).
2.2.1 Version with fail-safe
action „actuator stem
extends“ (FA)
The signal pressure in the actuator version
with fail-safe action „actuator stem extends“
is transmitted directly through the support el-
ement to the bottom diaphragm chamber.
The actuator stem is moved upward oppos-
ingthespringforce(seeFig.2).
If an additional solenoid valve is used, a
modiedsupportelementisusedtoroutethe
signal pressure.
2.2.2 Version with fail-safe
action „actuator stem
retracts“ (FE)
The support element of the actuator version
with fail-safe action „actuator stem retracts“
has a borehole at the side. The signal pres-
sure is transmitted over an external pipe to
the top diaphragm chamber. The actuator
stem is moved downward opposing the
springforce(seeFig.3).
Table2: Mounting on Type3372 Actuator on HVAC volves
Version Type3725 Positioner (direct attachment)
Actuator area 120cm²
Travel 15mm 30mm
Type to Valve Nominal size DN
3214 65 to 100 FormB
–
3214 125 to 150 – On request
3260 65 to 80 FormB
–
3260 100 to 150 – On request

EB 8313-3 EN 13
Design and principle of operation
33
61
62
33 Rod
61 Support element
62 Type 3725 Positioner
Fig.2: Signal pressure routing for "actuator
stem extends" (FA)
61 62
Pst
61 Support element
62 Type 3725 Positioner
Fig.3: Signal pressure routing for "actuator
stem retracts" (FE)
2.3 Fail-safe action
When the signal pressure fails, the fail-safe
action of the actuator depends on whether
the springs are installed in the top or bottom
diaphragm chamber.
Note
It is not possible to change the oper-
ating direction of Type3372 Actua-
tor by changing the location of the
diaphragm plate.
2.3.1 Version with fail-safe
action “actuator stem
extends“ (FA)
When the signal pressure is reduced or the
air supply fails, the springs move the actuator
stem downward and close the globe valve.
The valve opens when the signal pressure is
increased enough to overcome the force ex-
erted by the springs.
2.3.2 Version with fail-safe
action “actuator stem re-
tracts“ (FE)
When the signal pressure is reduced or the
air supply fails, the springs move the actua-
tor stem upward and open the globe valve.
The valve closes when the signal pressure is
increased enough to overcome the force ex-
erted by the springs.
Note
To prevent the actuator from being
damaged, observe the restrictions for
on/off service. See section 3.2.



14 EB 8313-3 EN
Application
2.4 Technical data
Type 3372 Actuator
Diaphragm area 120 cm² 350 cm²
Bench range in bar 0.4 to
1.4 1.4 to 2.3 2.1 to 3.3
1.5 to
2.1
2.1 to
2.7
1.5 to
2.7
2.2 to
3.8
Fail-safe action Stem
retracts
Stem
retracts
Stem
extends
Stem
extends
Stem
retracts
Stem
extends
Stem
retracts
Stem
extends
Travel 15 mm 30 mm
Supply pressure Max. 6 bar · Observe the restrictions for on/off service
Ambient
temperature range –35 to 90 °C 1) –35 to 90 °C 1)
Weight, approx. 3.3 kg 15 kg
Material
Actuator housing Aluminum, powder-paint coated 1.0332
Diaphragm NBR NBR
Actuator stem 1.4305 1.4401/1.4404
Electropneumatic positioner
Type 3725 Refer to Data Sheet uT 8394 and
Mounting and Operating Instructions uEB 8394
Electric limit switch
Type 4744-2 One electric limit contact · 15 mm travel range
uT 8367 and uEB 8367 –
1) NOTICE Observe temperature limits of the mounted valve accessories.
3 Application
Note
To mount the actuator on the valve or to remove it from the valve, follow the instruc-
tions written in the mounting and operating instructions of the corresponding valve.


EB 8313-3 EN 15
Application
3.1 Throttling service
TheType3372PneumaticActuatorisde-
signed for a maximum supply pressure of
6barwhenusedforthrottlingservice.
3.2 On/off service
To prevent the actuator from being dam-
aged, the supply pressure must not exceed
the upper spring range value by more than
3baratthemaximumwhentheactuator
with fail-safe action „actuator stem retracts“
is used for on/off service.
Table3: Example
Bench range Fail-safe action Max. supply
pressure
0.2 to 1.0 bar
Actuator stem
retracts
4bar
0.4 to 2.0 bar 5bar
0.6 to 3.0 bar 6bar
Labelactuatorswithreducedsupplypressure
correspondingly:
Max. supply pressure limited to to bar
For actuators with fail-safe action „actuator
stem extends“ and with a travel stop, the
supply pressure must not exceed the upper
springrangevaluebymorethan1.5barat
the maximum.

16 EB 8313-3 EN
Mounting on the valve
4 Mounting on the valve
The valve and actuator are delivered sepa-
rately and must be assembled on site. If the
positioner is already mounted on the actua-
tor (on the support element), it must be re-
moved before the actuator can be mounted
onto the valve.
4.1 Type 3372 (120 cm²)
The actuator is normally mounted onto the
valve bonnet (34) using its crossbeam (59)
and a central nut (35).
However,theactuatorwithitstworodscan
also be mounted onto valves with the corre-
sponding valve bonnet without the cross-
beam. See section 4.1.2.
4.1.1 Mounting using a cen-
tral nut
Form B, see Table1 on page 10
Fig.4
Thistypeofmountingapplies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.Itinvolvesmountingtheactua-
tor onto the valve bonnet (34) using a central
nut (35).
NOTICE
Do not undo the hex nuts (54) that
hold the crossbeam (59) in place on
the rod-type yoke.
ÎUnscrew the central nut (35) from the
valve bonnet (34).
ÎPush the plug together with the plug stem
into the seat.
ÎPlace the actuator with the crossbeam
(59) onto the thread of the valve bonnet
(34), making sure that the central nut
(35,SW36)isplacedovertheplug
stem, and fasten it to the valve bonnet.
This causes the actuator stem to be
presseddownapproximately1to2mm
against the force of the springs.
Tightening torque of the nut = 150 Nm.
WARNING!
For actuators with fail-safe action
„actuator stem retracts“ (FE), air must
be applied to the top diaphragm
chamber until the actuator stem
touches the plug stem.
Risk of crushing! Do not touch the
yoke.
The stem connector clamps can then
be mounted between the actuator
stem and plug stem.
ÎMount the stem connector clamps, while
aligning the follower clamp for the fol-
lower pin of the positioner parallel to the
support element.

EB 8313-3 EN 17
Mounting on the valve
33
35
59
54
34
33 Rod
34 Valve bonnet
35 Central nut
54 Hexnut(for33)
59 Crossbeam
Fig.4: Mounting using central nut – Type 3372-120 cm²

18 EB 8313-3 EN
Mounting on the valve
4.1.2 Mounting using rods
See Table1 on page 10 for Form C
The Type 3372 Actuator (120 cm²) is suit-
ableformountingonType3321Valvesin
DN65to100with15mmtravel.
Therodendsarettedwithadapterbush-
ings (33.1) to provide a threaded attach-
ment. Additionally, a plate (60) ensures the
correct distance between the rods.
ÎPlace the rods (33) in the corresponding
holes on the valve bonnet (34).
ÎHoldthehexagonalpartoftherodssta-
tionary using an open-end wrench
(widthacrossats22)andfasteneach
rod with a hex nut. During which, the ac-
tuator stem is pressed down approx. 1 to
2mm.
ÎPlace the stem connector clamp with trav-
el linkage behind the actuator stem and
fasten the other clamp onto it using two
screws.
At the same time, align the follower
clamp for the follower pin of the posi-
tioner parallel to the support element
(61).
WARNING!
For actuators with fail-safe action
„actuator stem retracts“ (FE), air must
be applied to the top diaphragm
chamber until the actuator stem
touches the plug stem.
Risk of crushing! Do not touch the
yoke.
The stem connector clamps can then
be mounted.
4.2 Type 3372 (350 cm²) –
mounting using rods
See Table1 on page 10 for Form C
Fig.5
The actuator with 350 cm² diaphragm area
is designed for Types 3321 and 3323 Valves
inDN65to100with15or30mmtravel.
ÎBefore mounting, unscrew the hex nuts
(54) from the rods. The plate (60) re-
mains attached to the rods.
ÎPlace the actuators with the rod ends on-
to the valve bonnet (34). Tighten the two
hex nuts (54) alternately, while holding
the rods stationary at the hexagonal part
with a open-end wrench (width across
ats22)topreventtherodsfromturning
in the bottom diaphragm case.
WARNING!
For actuators with fail-safe action
„actuator stem retracts“ (FE), air must
be applied to the actuator until the
actuator stem touches the plug stem.
Risk of crushing! Do not touch the
yoke.
ÎMount the stem connector clamps be-
tween the actuator stem and the plug
stem, while aligning the follower clamp
for the follower pin of the positioner par-
allel to the support element.

EB 8313-3 EN 19
Mounting on the valve
33
60
54
34
33 Rod
34 Valve bonnet
54 Hexnut(for33)
60 Plate
Fig.5: Mounting on rods - Type 3372 (350 cm²)

20 EB 8313-3 EN
Mounting on the valve
4.3 Changing the type of
mounting
AType3372Actuator(120cm²)whichhas
already been mounted using a central nut
can also be mounted later to a valve bonnet
suitable for mounting using rods. This re-
quires a plate (60) and two adapter bush-
ings (33.1) with hexagonal section to adapt
it to the diameter of the rods (33).
The conversion in the other direction is also
possible. This requires a crossbeam (59) and
two nuts (54).
4.3.1 Conversion of mounting
using a central nut to
rods
See Table1 on page 10 for conversion
from Form B to Form C
Fig.6 and Fig.7
ÎUndo the two screws on the stem connec-
tor and remove it from the actuator stem
and plug stem.
ÎUndo the central nut (35) and lift the ac-
tuator off the valve bonnet (34).
ÎTo undo the two hex nuts (54), the rods
(33) must be held stationary using an
open-end wrench (SW 22). Remove the
crossbeam (59).
ÎPosition the plate (60) and screw the two
adapter bushings (33.1) onto the thread
of the rods (33). This adapts the diame-
ter of the rods to the holes in the valve
bonnet (34).
ÎPlace the rods (33) on the valve bonnet
(34) and tighten both hex nuts (54) alter-
nately.
ÎMount the stem connector between the
actuator stem and plug stem, ensuring
the travel linkage runs parallel to the
support element.
4.3.2 Conversion of mounting
using rods to a central
nut
See Table1 on page 10 for conversion
from Form C to Form B
Fig.6 and Fig.7
ÎUndo the two screws on the stem connec-
tor and remove it from the actuator stem
and plug stem.
ÎUnscrew the hex nuts (54) from the
adapter bushings (33.1) and lift the actu-
ator of the valve bonnet (34).
ÎUnscrew the adapter bushings (33.1)
with hexagonal part from the rods (33)
and remove the plate (60).
ÎPlace the crossbeam (59) on the rods
(33) with the bent sides facing away
from the actuator housing. Fasten with
hex nuts (54).
ÎPlace the actuator on the valve bonnet
(34) and fasten with central nut (35).
ÎMount the stem connector between the
actuator stem and plug stem, ensuring
the travel linkage runs parallel to the
support element.