Samson 3372 Service manual

Translation of original instructions
EB 8313-3 EN
Type3372 with 120cm² actuator area Type3372 with 350cm² actuator area
Edition September 2019
Type3372 Electropneumatic Actuator
Actuator area: 120 and 350cm²
With Type3725 Positioner

Note on these mounting and operating instructions
These mounting and operating instructions assist you in mounting and operating the device
safely. The instructions are binding for handling SAMSON devices. The images shown in
these instructions are for illustration purposes only. The actual product may vary.
ÎFor the safe and proper use of these instructions, read them carefully and keep them for
later reference.
ÎIf you have any questions about these instructions, contact SAMSON‘s After-sales Service
Department ([e-mail]).
The mounting and operating instructions for the devices are included
in the scope of delivery. The latest documentation is available on our
website at www.samsongroup.com > Service & Support > Downloads >
Documentation.
Definition of signal words
Hazardous situations which, if not avoided,
will result in death or serious injury
Hazardous situations which, if not avoided,
could result in death or serious injury
Property damage message or malfunction
Additional information
Recommended action
DANGER
!
WARNING
!
NOTICE
!
Note
Tip
EB 8313-3 EN

Contents
EB 8313-3 EN
1 Safety instructions and measures ................................................................1-1
1.1 Notes on possible severe personal injury ......................................................1-4
1.2 Notes on possible personal injury ................................................................1-5
1.3 Notes on possible property damage .............................................................1-6
2 Markings on the device ..............................................................................2-1
2.1 Actuator nameplate .....................................................................................2-1
2.2 Label indicating actuator with preloaded springs ...........................................2-2
3 Design and principle of operation ...............................................................3-1
3.1 Direction of action .......................................................................................3-1
3.2 Signal pressure routing ................................................................................3-4
3.3 Fail-safe action ...........................................................................................3-4
3.3.1 Version with direction of action "stem extends" ..............................................3-4
3.3.2 Version with direction of action "stem retracts" ..............................................3-5
3.4 Mounting types ...........................................................................................3-5
3.5 Versions .....................................................................................................3-6
3.6 Accessories ................................................................................................3-6
3.7 Technical data ............................................................................................3-7
4 Shipment and on-site transport ...................................................................4-1
4.1 Accepting the delivered goods .....................................................................4-1
4.2 Removing the packaging from the actuator ...................................................4-1
4.3 Transporting and lifting the actuator .............................................................4-1
4.3.1 Transporting the actuator .............................................................................4-1
4.3.2 Lifting the actuator ......................................................................................4-2
4.4 Storing the actuator .....................................................................................4-2
5 Mounting and assembly .............................................................................5-1
5.1 Preparation for mounting .............................................................................5-1
5.2 Mounting the device ....................................................................................5-1
5.2.1 Mounting the actuator onto the valve ............................................................5-2
5.3 Connections................................................................................................5-6
6 Start-up .....................................................................................................6-1
6.1 Preloading the springs .................................................................................6-2
6.1.1 Tensioning the springs .................................................................................6-2
6.1.2 Increasing the actuator thrust .......................................................................6-3
6.1.3 Adapting the travel range ............................................................................6-3
6.2 Adjusting the travel stop ..............................................................................6-3
6.2.1 Bottom travel stop (minimum travel) ..............................................................6-5
6.2.2 Top travel stop (maximum travel) ..................................................................6-5

Contents
EB 8313-3 EN
6.3 Version with handwheel ...............................................................................6-5
6.3.1 Operating the handwheel of version with "stem extends" direction of action ....6-5
6.3.2 Operating the handwheel of version with "stem retracts" direction of action .....6-6
7 Operation..................................................................................................7-1
7.1 Throttling service .........................................................................................7-1
7.2 On/off service ............................................................................................7-1
7.3 Manual mode (versions with handwheel only) ...............................................7-2
7.4 Additional notes concerning operation .........................................................7-2
8 Malfunctions ..............................................................................................8-1
8.1 Troubleshooting ..........................................................................................8-1
8.2 Emergency action .......................................................................................8-2
9 Service and conversion work ......................................................................9-1
9.1 Periodic testing ...........................................................................................9-2
9.2 Preparing the valve for service work .............................................................9-3
9.3 Mount the valve after service work ...............................................................9-3
9.4 Service work...............................................................................................9-6
9.4.1 Replacing the diaphragm ............................................................................9-6
9.4.2 Replacing the actuator stem seals .................................................................9-8
9.5 Conversion work .......................................................................................9-12
9.5.1 Reversing the direction of action (fail-safe action) ........................................9-12
9.6 Ordering spare parts and operating supplies ..............................................9-12
10 Decommissioning .....................................................................................10-1
11 Removal ..................................................................................................11-1
11.1 Removing the actuator from the valve .........................................................11-2
11.2 Relieving the spring compression in the actuator ..........................................11-3
12 Repairs ....................................................................................................12-1
12.1 Returning devices to SAMSON ..................................................................12-1
13 Disposal...................................................................................................13-1
14 Certicates...............................................................................................14-1
15 Annex......................................................................................................15-1
15.1 Tightening torques, lubricants and tools ......................................................15-1
15.2 Spare parts ..............................................................................................15-1
15.3 After-sales service .....................................................................................15-6

EB 8313-3 EN 1-1
Safety instructions and measures
1 Safety instructions and measures
Intended use
The SAMSON Type3372 Actuator is designed for operating a mounted globe valve. In com-
bination with the valve, the actuator is used to shut off and control the ow of liquids, gases
or vapors in the pipeline. The actuator is suitable for throttling service. In this case, the actua-
tor is combined with the Type3725 Positioner. The actuator can be used in processing and
industrial plants.
The actuator is designed to operate under exactly dened conditions (e.g. thrust, travel).
Therefore, operators must ensure that the actuator is only used in operating conditions that
meet the specications used for sizing the actuator at the ordering stage. In case operators
intend to use the actuator in other applications or conditions than specied, contact SAM-
SON.
SAMSON does not assume any liability for damage resulting from the failure to use the de-
vice for its intended purpose or for damage caused by external forces or any other external
factors.
ÎRefer to the technical data and nameplate for limits and elds of application as well as
possible uses.
Reasonably foreseeable misuse
The actuator is not suitable for the following applications:
−Use outside the limits dened during sizing and by the technical data
−Use outside the limits dened by the accessories connected to the actuator
Furthermore, the following activities do not comply with the intended use:
−Use of non-original spare parts
−Performing service and repair work not described in these instructions
Qualications of operating personnel
The actuator must be mounted, started up, serviced and repaired by fully trained and quali-
ed personnel only; the accepted industry codes and practices are to be observed. Accord-
ing to these mounting and operating instructions, trained personnel refers to individuals who
are able to judge the work they are assigned to and recognize possible hazards due to their
specialized training, their knowledge and experience as well as their knowledge of the appli-
cable standards.

1-2 EB 8313-3 EN
Safety instructions and measures
Explosion-protected versions of this device must be operated only by personnel who has un-
dergone special training or instructions or who is authorized to work on explosion-protected
devices in hazardous areas.
Personal protective equipment
We recommend wearing the following personal protective equipment when handling the
Type3372 Electropneumatic Actuator:
−Safety gloves and safety footwear (ESD footwear, if necessary) when mounting or remov-
ing the actuator
−Eye protection and hearing protection while the actuator is operating.
ÎCheck with the plant operator for details on further protective equipment.
Revisions and other modications
Revisions, conversions or other modications of the product are not authorized by SAMSON.
They are performed at the user's own risk and may lead to safety hazards, for example.
Furthermore, the product may no longer meet the requirements for its intended use.
Safety features
The Type3372 Electropneumatic Actuator does not have any special safety equipment.
Warning against residual hazards
To avoid personal injury or property damage, plant operators and operating personnel must
prevent hazards that could be caused in the actuator by the signal pressure, stored spring
energy or moving parts by taking appropriate precautions. They must observe all hazard
statements, warning and caution notes in these mounting and operating instructions.
Hazards resulting from the special working conditions at the installation site of the actuator
must be identied in a risk assessment and prevented through the corresponding safety in-
structions drawn up by the operator.
Responsibilities of the operator
The operator is responsible for proper operation and compliance with the safety regulations.
Operators are obliged to provide these mounting and operating instructions as well as the
referenced documents to the operating personnel and to instruct them in proper operation.
Furthermore, the operator must ensure that operating personnel or third persons are not
exposed to any danger.

EB 8313-3 EN 1-3
Safety instructions and measures
Responsibilities of operating personnel
Operating personnel must read and understand these mounting and operating instructions as
well as the referenced documents and observe the specied hazard statements, warnings
and caution notes. Furthermore, the operating personnel must be familiar with the applicable
health, safety and accident prevention regulations and comply with them.
Servicing explosion-protected devices
If a part of the device on which the explosion protection is based needs to be serviced, the
device must not be put back into operation until a qualied inspector has assessed it accord-
ing to explosion protection requirements, has issued an inspection certicate or given the de-
vice a mark of conformity. Inspection by a qualied inspector is not required if the manufac-
turer performs a routine test on the device before putting it back into operation. Document
the passing of the routine test by attaching a mark of conformity to the device. Replace ex-
plosion-protected components only with original, routine-tested components by the manufac-
turer.
Devices that have already been operated outside hazardous areas and are intended for fu-
ture use inside hazardous areas must comply with the safety requirements placed on serviced
devices. Before being operated inside hazardous areas, test the devices according to the
specications for servicing explosion-protected devices.
Maintenance, calibration and work on equipment
ÎOnly use intrinsically safe current/voltage calibrators and measuring instruments for in-
terconnection with intrinsically safe circuits to check or calibrate the equipment inside or
outside hazardous areas.
ÎObserve the maximum permissible values specied in the certicates for intrinsically safe
circuits.
Referenced standards and regulations
The Type3372 Electropneumatic Actuator fullls the requirements of the Directives
2014/30/EU and 2014/34/EU. The 'Certicates' section contains this declaration of con-
formity.

1-4 EB 8313-3 EN
Safety instructions and measures
Referenced documentation
The following documents apply in addition to these mounting and operating instructions:
−uEB8394 for the mounted Type3725 Positioner
−Mounting and operating instructions for the mounted valve
−Mounting and operating instructions for mounted valve accessories (e.g. uEB8367 for
Type4744 Limit Switch)
−uAB0100 for tools, tightening torques and lubricant
1.1 Notes on possible severe personal injury
DANGER
!
Risk of bursting in the actuator.
Actuators are pressurized. Improper opening can lead to actuator components burst-
ing.
ÎBefore starting any work on the actuator, depressurize all plant sections affected
and the actuator.
Risk of fatal injury due to the ignition of an explosive atmosphere.
Incorrect installation, operation or servicing of the electropneumatic actuator in poten-
tially explosive atmospheres may lead to ignition of the atmosphere and cause death.
ÎThe following regulations apply to installation in hazardous areas: EN60079-14
(VDE0165, Part1).
ÎInstallation, operation or servicing of the electropneumatic actuator must only per-
formed by personnel who has undergone special training or instructions or who is
authorized to work on explosion-protected devices in hazardous areas.

EB 8313-3 EN 1-5
Safety instructions and measures
1.2 Notes on possible personal injury
WARNING
!
Crush hazard arising from moving parts.
The actuator contains moving parts (actuator stem), which can injure hands or ngers if
inserted into the actuator.
ÎDo not touch the actuator stem or insert hands or nger into the yoke or beneath the
actuator stem while the air supply is connected to the actuator.
ÎWhile working on the actuator, disconnect and lock the pneumatic air supply as well
as the control signal.
ÎDo not impede the movement of the actuator stem by inserting objects into the yoke.
ÎBefore unblocking the actuator stem after it has become blocked (e.g. due to seizing
up after remaining in the same position for a long time), release any stored energy
in the actuator (e.g. spring compression). See 'Relieving the spring compression in
the actuator' in the 'Removal' section.
Risk of personal injury when the actuator vents.
The actuator is operated with air. As a result, air is vented during operation.
ÎInstall the control valve in such a way that vent holes are not located at eye level and
the actuator does not vent at eye level in the work position 1).
ÎUse suitable silencers and vent plugs.
ÎWear eye and hearing protection when working near the actuator.
Risk of personal injury due to preloaded springs.
Actuators with preloaded springs are under tension. These actuators can be identied
by several longer bolts with nuts protruding from the bottom diaphragm case. These
bolts allow the spring compression to be relieved evenly on disassembling the actuator.
Actuators with considerably preloaded springs are also labeled correspondingly (see
the 'Markings on the device' section).
ÎBefore starting any work on the actuator, relieve the compression from the preload-
ed springs. See 'Relieving the spring compression in the actuator' in the 'Removal'
section.
1) If not described otherwise in the valve documentation, the work position for the control valve is the
front view looking onto the operating controls (including valve accessories).

1-6 EB 8313-3 EN
Safety instructions and measures
WARNING
!
Risk of personal injury through incorrect operation, use or installation as a result of
information on the actuator being illegible.
Over time, markings, labels and nameplates on the actuator may become covered with
dirt or become illegible in some other way. As a result, hazards may go unnoticed and
the necessary instructions not followed. There is a risk of personal injury.
ÎKeep all relevant markings and inscriptions on the device in a constantly legible
state.
ÎImmediately renew damaged, missing or incorrect nameplates or labels.
1.3 Notes on possible property damage
NOTICE
Risk of actuator damage due to excessively high supply pressure.
An excessively high supply pressure can lead to impermissible movements or forces
which might damage the actuator.
ÎObserve supply pressure restrictions. See the 'Operation' section.
ÎRestrict the supply pressure by using a suitable supply pressure reducing station.
An incorrect electric signal will damage the electropneumatic actuator.
A current source must be used to provide the electrical power for the actuator.
ÎOnly use a current source and never a voltage source.
Incorrect assignment of the terminals will damage the electropneumatic actuator and
will lead to malfunction.
For the actuator to function properly, the prescribed terminal assignment must be ob-
served.
ÎConnect the electrical wiring according to the prescribed terminal assignment.

EB 8313-3 EN 1-7
Safety instructions and measures
NOTICE
Risk of actuator damage due to excessively high or low tightening torques.
Observe the specied torques on tightening actuator components. Excessively tightened
torques lead to parts wearing out quicker. Parts that are not tightened far enough may
loosen.
ÎObserve the specied tightening torques (uAB0100).
Risk of actuator damage due to the use of unsuitable tools.
Certain tools are required to work on the actuator.
ÎOnly use tools approved by SAMSON (uAB0100).
Risk of actuator damage due to the use of unsuitable lubricants.
The lubricants to be used depend on the actuator material. Unsuitable lubricants may
corrode and damage the surface.
ÎOnly use lubricants approved by SAMSON (uAB0100).

1-8 EB 8313-3 EN

EB 8313-3 EN 2-1
Markings on the device
2 Markings on the device
2.1 Actuator nameplate
The nameplate is stuck on the diaphragm
casing. The nameplate of the Type3372 with
120cm² actuator area is located on the bot-
tom diaphragm case. The nameplate of the
Type3372 with 350cm² actuator area is lo-
cated on the top diaphragm case. It includes
all details required to identify the device:
1 Actuator area
2 Model number
3 Conguration ID
4 Serial number
5 Max. supply pressure pmax in bar /psi
6 Month and year of manufacture
7 Symbol indicating fail-safe action
Actuator stem extends (FA)
Actuator stem retracts (FE)
8Operating travel in mm
9 Bench range in bar
10 Bench range in psi
11 indicating manual override
12 Data Matrix code
Nameplate
Fig.2-1: Nameplate position on the Type3372 Actuator
SAMSON AG D-60314 Frankfurt
See technical data for ambient temperature
actuator cm²
Model 3372-
Var-ID Serial no.
Air supply max.
SAMSON 3372
Made in Germany
1
3 4
5
2
6
8
7
12
9
10
11
Fig.2-2: Nameplate of Type3372 Actuator with Type3725 Positioner (direct attachment)

2-2 EB 8313-3 EN
Markings on the device
2.2 Label indicating actuator with preloaded springs
A label on the actuator indicates that the actuator springs are preloaded in the delivered
state (see Fig.2-3).
ACHTUNG !
VORGESPANNTER
ANTRIEB
ATTENTION !
PRE-LOADED
ACTUATOR
ATTENTION !
SERVO-MOTEUR
PRECONTRAINT
Fig.2-3: Adhesive label indicating preloaded actuator springs in the delivered state

EB 8313-3 EN 3-1
Design and principle of operation
3 Design and principle of oper-
ation
The Type3372 Electropneumatic Actuators
have an actuator area of either 120 or
350cm². They are mainly used for attach-
ment to SAMSON 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
Table 3-1 and Table 3-2 provide an over-
view of the possible combinations and how
the actuator is mounted on the valve.
The electropneumatic actuators mainly con-
sist of two diaphragm cases, a diaphragm
and internal springs. The actuator is connect-
ed to the valve bonnet using a rod-type
yoke. The stem connector clamps connect the
actuator stem with the plug stem of the valve.
The Type3725 Electropneumatic Positioner is
attached to the rod with the largest diameter
using a support element. This positioner con-
verts the control signal received from a con-
trol system (4 to 20mA reference variable)
into a proportional pressure signal.
The signal pressure pst creates the force F =
pst · A at the diaphragm surface A, which is
opposed by the springs in the actuator. The
bench range is determined by the number of
springs used and their compression, taking
into account the rated travel. The travel is
proportional to the signal pressure pst.
3.1 Direction of action
The direction of action is determined by how
the springs and diaphragm plate are ar-
ranged in the actuator. The direction of ac-
tion is xed at the ordering stage and cannot
be changed.
Actuator stem extends (FA)
With direction of action "actuator stem ex-
tends", the compressed air is applied to the
signal pressure connection on the bottom di-
aphragm case.
Actuator stem retracts (FE)
With direction of action "actuator stem re-
tracts", the compressed air is applied to the
signal pressure connection on the top dia-
phragm case.

3-2 EB 8313-3 EN
Design and principle of operation
A2 Bottom diaphragm case
A3 Actuator stem
A10 Spring
A11 Rod
A13 Diaphragm plate
A14 Diaphragm plate
A16 Top diaphragm case
A17 Crossbeam
A18 Diaphragm
A25 Rod nut
A26 Collar nut
A30 Stem connector clamps
A16
A10
A18
A2
A14
A3
A30
A26
A13
A17
A11
A25
Version with direction of action
"actuator stem extends"
Version with direction of action
"actuator stem retracts"
Fig.3-1: Type3372 with 120cm² actuator area and crossbeam

EB 8313-3 EN 3-3
Design and principle of operation
A1 Top diaphragm case
A2 Bottom diaphragm case
A4 Diaphragm
A5 Diaphragm plate
A7 Actuator stem
A10 Spring
A15 Collar nut
A20 Hex bolt
A21 Hex nut
A25 Washer
A27 Compressor
A33 Stem
A40 Radial shaft seal
A41 Wiper ring
A42 Dry bearing
A50 Screw for rod (A51)
A51 Rod
A54 Rod nut
A60 Plate
A61 Support element
S Signal pressure
connection (stem retracts)
A61
A10 A1
A5
S
A2
A1
A4
A33
A7
A15
A51
A60
A54
A50
A25
A20
A21
A27
A41
A42
A40
Fig.3-2: Type3372 with 350cm² actuator area

3-4 EB 8313-3 EN
Design and principle of operation
3.2 Signal pressure routing
The signal pressure of the mounted
Type3725 Positioner is routed through the
corresponding port in the support element.
Actuator stem extends (FA)
In the "actuator stem extends" version, the
signal pressure is routed directly through the
support element to the bottom diaphragm
chamber and moves the actuator stem up-
ward opposing the spring force (see
Fig.3-3).
Actuator stem retracts (FE)
The support element of the version with fail-
safe action "actuator stem retracts" has a
borehole at the side. The signal pressure is
routed to the top diaphragm chamber over
external piping and moves the actuator stem
downward opposing the spring force (see
Fig.3-4).
3.3 Fail-safe action
When the signal pressure is reduced or the
control signal fails, the fail-safe position of
the control valve (see section3.1) depends
on whether the springs are installed in the
top or bottom diaphragm chamber.
3.3.1 Version with direction of
action "stem extends"
When the signal pressure is reduced or the
control signal fails, the springs move the ac-
tuator stem downward and close the globe
valve. The valve opens when the signal pres-
sure is increased enough to overcome the
spring force.
Fig.3-3: Signal pressure routing for
"actuator stem extends" (FA)
Fig.3-4: Signal pressure routing for "actuator stem
retracts" (FE)

EB 8313-3 EN 3-5
Design and principle of operation
3.3.2 Version with direction of
action "stem retracts"
When the signal pressure is reduced or the
control signal fails, the springs move the ac-
tuator stem upward and open a mounted
globe valve. The valve closes when the signal
pressure is increased enough to overcome
the spring force.
3.4 Mounting types
There are two types of mounting depending
on the valve/actuator combination: mount-
ing using a crossbeam or rods (see Table 3-1
and Table 3-2).
When the actuator is mounted to the valve
using a crossbeam (form B, Fig.3-5), the ac-
tuator is fastened to the valve bonnet using a
central nut.
When the actuator is mounted using rods
(form C, Fig.3-6), the actuator is connected
to the valve bonnet using rods. In this case, a
crossbeam is not required for mounting the
actuator. A plate keeps the correct distance
between rods in the 350cm² version.
Both mounting types are described in the
'Mounting and assembly' section.
Fig.3-5: FormB: mounting using crossbeam
Fig.3-6: FormC: mounting using rods (in this
example: 350cm²)
Table 3-1: Mounting onto HVAC valves
Actuator area 120cm² 350cm²
Travel 15mm 30mm
Type ... Valve size DN
3214 65 to 100 Form B –
3214 125 to 250 –On request
3260 65 to 80 Form B –
3260 100 to 150 –On request

3-6 EB 8313-3 EN
Design and principle of operation
3.5 Versions
−Standard version of Type3372
(120cm²)
The housings of Type3372 Electropneu-
matic Actuators have an actuator area of
120cm² and are made of die-cast alu-
minum.
−Standard version of Type3372
(350cm²)
The housings of Type3372 Electropneu-
matic Actuators have an actuator area of
350cm² and are made of sheet steel.
−Version with travel stop (120cm²)
The Type3372 Actuators with 120cm²
actuator area can be tted with a me-
chanically adjustable travel stop. The
travel is reduced by up to 50% in both
directions of action (stem extends or re-
tracts).
The travel stop is not available for
Type3372 (350cm²).
−Version with handwheel (120cm²)
The Type3372 Actuators (120cm²) can
be tted with an additional handwheel.
The handwheel is mounted on the top di-
aphragm case and is used to adjust the
travel manually.
The handwheel is not available for
Type3372 (350cm²).
3.6 Accessories
Vent plugs
Vent plugs are screwed into the exhaust air
ports of pneumatic and electropneumatic de-
vices. They ensure that any exhaust air that
Table 3-2: Mounting onto SeriesV2001 Valves
120cm² 350cm²
Stem extends (FA) Stem retracts (FE) Stem
extends (FA)
Stem
retracts (FE)
Stem
extends (FA)
Stem
retracts (FE)
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 1) –C 1) –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