Samson 3251 Mounting And Operating Instructions
Type 3251 Valve
In combination with an actuator,
e.g. a SAMSON Type3271 or Type3277 Pneumatic Actuator
ANSI version
Translation of original instructions
Type3251 Valve with Type3271 Actuator
Mounting and
Operating Instructions
EB 8052 EN
Edition July 2016
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.
Î For the safe and proper use of these instructions, read them carefully and keep them for
later reference.
Î If you have any questions about these instructions, contact SAMSON‘s After-sales Service
Department (aftersalesservice@samson.de).
The mounting and operating instructions for the devices are included in
the scope of delivery. The latest documentation is available on our website
(www.samson.de) > Product documentation. You can enter the document
number or type number in the [Find:] eld to look for a document.
Denition of signal words
!
DANGER
Hazardous situations which, if not avoided,
will result in death or serious injury
!
WARNING
Hazardous situations which, if not avoided,
could result in death or serious injury
2 EB 8052 EN
!
NOTICE
Property damage message or malfunction
Note
Additional information
Tip
Recommended action
Contents
1 Safety instructions and measures ...................................................................5
1.1 Notes on possible severe personal injury .........................................................8
1.2 Notes on possible personal injury ...................................................................8
1.3 Notes on possible property damage ................................................................9
2 Markings on the control valve ......................................................................12
2.1 Valve nameplate ..........................................................................................12
2.2 Actuator nameplate ......................................................................................13
2.3 Material number ..........................................................................................13
3 Design and principle of operation ................................................................14
3.1 Fail-safe positions ........................................................................................14
3.2 Versions ......................................................................................................16
3.3 Technical data .............................................................................................16
4 Measures for preparation ............................................................................24
4.1 Unpacking ..................................................................................................24
4.2 Transporting and lifting ................................................................................24
4.2.1 Transporting ................................................................................................25
4.2.2 Lifting ..........................................................................................................25
4.3 Storage .......................................................................................................28
4.4 Preparation for installation ............................................................................29
5 Mounting and start-up .................................................................................30
5.1 Mounting the actuator onto the valve .............................................................30
5.2 Installing the valve into the pipeline ...............................................................31
5.2.1 Checking the installation conditions ...............................................................31
5.2.2 Additional ttings .........................................................................................32
5.2.3 Installing the control valve .............................................................................33
5.3 Quick check ................................................................................................34
6 Operation ...................................................................................................36
6.1 Working in manual mode .............................................................................36
7 Servicing.....................................................................................................38
7.1 Replacing the gasket ....................................................................................39
7.1.1 Standard version..........................................................................................39
7.1.2 Version with insulating section or bellows seal ................................................41
EB 8052 EN 3
Contents
7.2 Replacing the packing ..................................................................................41
7.2.1 Standard version..........................................................................................41
7.2.2 Version with insulating section .......................................................................43
7.3 Replacing the seat and plug ..........................................................................45
7.3.1 Standard version..........................................................................................47
7.3.2 Version with insulating section .......................................................................48
7.4 Preparation for return shipment .....................................................................49
7.5 Ordering spare parts and operating supplies .................................................49
8 Malfunctions ...............................................................................................50
8.1 Troubleshooting ...........................................................................................50
8.2 Emergency action ........................................................................................51
9 Decommissioning and disassembly ..............................................................52
9.1 Decommissioning .........................................................................................52
9.2 Removing the valve from the pipeline .............................................................52
9.3 Removing the actuator from the valve ............................................................53
9.4 Disposal ......................................................................................................53
10 Annex.........................................................................................................54
10.1 After-sales service ........................................................................................54
10.2 Certicates ..................................................................................................54
10.3 Spare parts .................................................................................................56
4 EB 8052 EN
Safety instructions and measures
1 Safety instructions and measures
Intended use
The SAMSON Type3251 Globe Valve in combination with an actuator (e.g. Type3271 or
Type3277 Pneumatic Actuator) is designed to regulate the ow rate, pressure or temperature
of liquids, gases or vapors. The valve with its actuator is designed to operate under exactly
dened conditions (e.g. operating pressure, process medium, temperature). Therefore, operators must ensure that the control valve is only used in applications that meet the specications
used for sizing the valve at the ordering stage. In case operators intend to use the control
valve in other applications or conditions than specied, contact SAMSON.
SAMSON does not assume any liability for damage resulting from the failure to use the
valve for its intended purpose or for damage caused by external forces or any other external
factors.
Î Refer to the technical data and nameplate for limits and elds of application as well as
possible uses.
Reasonably foreseeable misuse
The control valve is not suitable for the following applications:
− Use outside the limits dened during sizing and in the technical data
− Use outside the limits dened by the valve accessories mounted on the control valve
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
Qualications of operating personnel
The control valve must be mounted, started up, serviced, and repaired by fully trained and
qualied personnel only; the accepted industry codes and practices are to be observed.
According 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 applicable standards.
EB 8052 EN 5
Safety instructions and measures
Personal protective equipment
We recommend wearing the following protective equipment depending on the process medium:
− Protective clothing, gloves, and eyewear in applications with hot, cold, and/or corrosive
media
− Wear hearing protection when working near the valve.
Î Check with the plant operator for details on further protective equipment.
Revisions and other modications
Revisions, conversions or other modications to 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 devices
Upon supply air or control signal failure, the valve moves to its fail-safe position (see
section3.1). The fail-safe action of the actuator is the same as its direction of action and is
specied on the nameplate of SAMSON actuators (see actuator documentation).
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 control valve by the process medium, the operating pressure, the signal pressure or by moving parts by taking appropriate precautions. They
must observe all hazard statements, warning and caution notes in these mounting and operating instructions, especially for installation, start-up, and service work.
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.
Responsibilities of operating personnel
Operating personnel must read and understand these mounting and operating instructions as
well as the referenced documents and observe the hazard statements, warning and caution
notes specied in them. Furthermore, the operating personnel must be familiar with the applicable health, safety and accident prevention regulations and comply with them.
6 EB 8052 EN
Safety instructions and measures
Referenced standards and regulations
The control valves comply with the requirements of the European Pressure Equipment Directive 2014/68/EU. Valves with a CE marking have a declaration of conformity, which includes information about the applied conformity assessment procedure. This declaration of
conformity is included in the Appendix of these instructions (see section10.2).
According to the ignition risk assessment performed in accordance with EN13463-1:2009,
section 5.2, the non-electrical control valves do not have their own potential ignition source
even in the rare incident of an operating fault. As a result, they do not fall within the scope of
Directive 2014/34/EU.
Î For connection to the equipotential bonding system, observe the requirements specied in
section 6.4 of EN60079-14 (VDE0165 Part 1).
Referenced documentation
The following documents apply in addition to these mounting and operating instructions:
− Mounting and operating instructions for mounted actuator, e.g. uEB8310-X for
SAMSON Type3271 and Type3277 Actuators
− Mounting and operating instructions for mounted valve accessories (positioner, solenoid
valve etc.)
− uWA0029 for tools and tightening torques
EB 8052 EN 7
Safety instructions and measures
1.1 Notes on possible severe personal injury
!
DANGER
Risk of bursting in pressure equipment.
Control valves and pipelines are pressure equipment. Improper opening can lead to
valve components bursting.
Î Before starting any work on the control valve, depressurize all plant sections
concerned as well as the valve.
Î Drain the process medium from all the plant sections concerned as well as the
valve.
Î Wear personal protective equipment.
1.2 Notes on possible personal injury
!
WARNING
Crush hazard arising from moving parts.
The control valve contains moving parts (actuator and plug stems), which can injure
hands or ngers if inserted into the valve.
Î Do not insert hands or ngers into the yoke while the valve is in operation.
Î While working on the control valve, disconnect and lock the pneumatic air supply as
well as the control signal.
Risk of personal injury when the actuator vents.
While the valve is operating, the actuator may vent during closed-loop control or when
the valve opens or closes.
Î Install the control valve in such a way that the actuator does not vent at eye level.
Î Use suitable silencers and vent plugs.
Î Wear eye protection when working in close proximity to the control valve.
8 EB 8052 EN
Safety instructions and measures
!
WARNING
Risk of personal injury due to preloaded springs.
Valves in combination with pneumatic actuators with preloaded springs are under tension. These control valves with SAMSON pneumatic actuators can be identied by the
long bolts protruding from the bottom of the actuator.
Î Before starting any work on the actuator, relieve the compression from the preload-
ed springs (see associated actuator documentation).
Risk of personal injury due to residual process medium in the valve.
While working on the valve, residual process medium can escape and, depending on
its properties, may lead to personal injury, e.g. (chemical) burns.
Î If possible, drain the process medium from all the plant sections concerned and the
valve.
Î Wear protective clothing, safety gloves, and eyewear.
Risk of burn injuries due to hot or cold components and pipelines.
Depending on the process medium, valve components, and pipelines may get very hot
or cold and cause burn injuries.
Î Allow components and pipelines to cool down or heat up.
Î Wear protective clothing and safety gloves.
1.3 Notes on possible property damage
!
NOTICE
Risk of valve damage due to contamination (e.g. solid particles) in the pipeline.
The plant operator is responsible for cleaning the pipelines in the plant.
Î Flush the pipelines before start-up.
Î Observe the maximum permissible pressure for valve and plant.
Risk of valve damage due to unsuitable medium properties.
The valve is designed for a process medium with dened properties.
Î Only use the process medium specied for sizing the valve.
EB 8052 EN 9
Safety instructions and measures
!
NOTICE
Risk of leakage and valve damage due to excessively high or low tightening torques.
Observe the specied torques on tightening control valve components. Excessively tightened torques lead to parts wearing out quicker. Parts that are too loose may cause leakage.
Î Observe the specied tightening torques (uWA0029).
Risk of valve damage due to the use of unsuitable tools.
Certain tools are required to work on the valve.
Î Only use tools approved by SAMSON (uWA0029).
Risk of valve damage due to the use of unsuitable lubricants.
The lubricants to be used depend on the valve material. Unsuitable lubricants may corrode and damage the valve surface.
Î Only use lubricants approved by SAMSON (see parts list).
10 EB 8052 EN
EB 8052 EN 11
Markings on the control valve
2 Markings on the control valve
2.1 Valve nameplate
SAMSON
1…5
6 8
10 11
12 13
16
15
14
17
18
19
20
9
Fig.1: Valve nameplate
1…5 PED (Pressure Equipment Directive), "Art. 4, Abs. 3"
ID of the notied body, uid group, and category
6 Type designation
8 Material
9 Year of manufacture
10 Valve size:
DIN: DN · ANSI: NPS· JIS: DN…A/B
11 Pressure rating:
DIN: PN · ANSI: CL · JIS: K
12 Order no. with modication index
For after-sales service orders: AA prex
13 Position in order
For after-sales service orders: conguration ID
14 Flow coefcient:
· ANSI: CV · JIS: C
DIN: K
VS
V
15 Characteristic:
%: equal percentage · Lin: linear · NO/NC: quick opening
16 Seat-plug seal:
ME: metal (see section3.3)
HA: carbide metal
ST: Stellite
®
facing
KE: ceramic
PT: soft seal with PTFE
PK: soft seal with PEEK
17 Seat code (trim material) · On request
18 Pressure balancing:
DIN: D · ANSI: B · JIS: B
19 Flow divider:
1: ST1 · 3: ST3
AC trim:
AC-1 to AC-3
20 Country of origin
12 EB 8052 EN
The nameplate (80) is afxed to the yoke of
80
the valve (see Fig.2).
Fig.2: Location of the nameplate
2.2 Actuator nameplate
See associated actuator documentation.
Markings on the control valve
2.3 Material number
The seat and plug of the valves have an article number written on them. Specifying this
article number, you can contact us to nd out
which material is used. Additionally, a seat
code is used to identify the trim material.
This seat code is specied on the nameplate
(17 on nameplate). For more details on the
nameplate, see section2.1.
EB 8052 EN 13
Design and principle of operation
3 Design and principle of oper-
ation
The single-seated Type3251 Globe Valve is
preferably combined with a SAMSON
Type3271 or Type3277 Pneumatic Actuator
(see Fig.3). It can also be combined with
other actuators.
The seat (4) and plug with plug stem (5) are
installed in the body (1). The plug stem is
connected to the actuator stem (A7) by the
stem connector clamps (A26) and is sealed
by a spring-loaded V-ring packing (15). The
springs in the pneumatic actuator (A) are located either above or below the diaphragm
(A4) depending on the selected fail-safe action (see section3.1). A change in the signal
pressure acting on the diaphragm causes the
plug to move. The actuator size is determined by the diaphragm area.
The medium ows through the valve in the
direction indicated by the arrow. A rise in
signal pressure causes the force acting on
the diaphragm in the actuator to increase.
The springs are compressed. Depending on
the selected direction of action, the actuator
stem retracts or extends. As a result, the plug
position in the seat changes and determines
the ow rate through the valve.
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 valve. The
valve opens when the signal pressure is increased enough to overcome the force exerted by the springs.
Actuator stem retracts (FE)
When the signal pressure is reduced or the
air supply fails, the springs move the actuator stem upwards and open the valve. The
valve closes when the signal pressure is increased enough to overcome the force exerted by the springs.
Tip
The actuator's direction of action can be reversed, if required. Refer to the mounting
and operating instructions of the pneumatic
actuator:
uEB8310‑X for Type3271 and Type3277
3.1 Fail-safe positions
The fail-safe position depends on the mounted actuator.
Depending on how the compression springs
are arranged in the pneumatic actuator, the
valve has two different fail-safe positions:
14 EB 8052 EN
A16
A8
A7
15
Design and principle of operation
A
A10
A4
S
84
A26
9
10
S
14
17
3
1
8
92
2
5
4
1 Body
2 Bonnet
3 Yoke
4 Seat
5 Plug (with plug stem)
8 Threaded bushing
(packing nut)
9 Stem connector nut
10 Lock nut
14 Nut
15 Packing
17 Body gasket
84 Travel indicator scale
92 Castellated nut
A Actuator
A4 Diaphragm
A7 Actuator stem
A8 Ring nut
A10 Spring
A16 Vent plug
A26 Stem connector clamps
S Signal pressure
connection
Fig.3: Type3251 Valve with Type3271 Pneumatic Actuator (left) and Type3277 Pneumatic
Actuator (right)
EB 8052 EN 15
Design and principle of operation
3.2 Versions
The modular design allows an insulating section or metal bellows to be tted to the standard valve version.
Actuators
In these instructions, the preferable combination with a Type3271 or Type3277 Pneumatic Actuator is described. The pneumatic
actuator (with or without handwheel) can be
replaced by another pneumatic actuator in a
different size, but with the same travel.
Î Observe the maximum permissible actu-
ator force.
Note
If the travel range of the actuator is larger
than the travel range of the valve, the spring
assembly in the actuator must be preloaded
so that the travel ranges match. See associated actuator documentation.
The basic pneumatic actuator can be replaced by a pneumatic actuator with additional handwheel or by an electric actuator.
Compliance
The Type3251 Valve bears both the CE and
EAC marks of conformity.
Temperature range
Depending on the version, the control valve
is designed for a temperature range from
–10 to +220°C (14 to 428°F). The use of
an insulating section or bellows seal extends
the temperature range from –196 to
+550°C (–325 to +1022°F).
Leakage class
Depending on the version, the following
leakage class applies:
Seal (16 on
nameplate)
Pressure balancing (18 on nameplate)
Leakage class
(according to
ANSI/FCI70-2)
ME, ST ME, ST PT, PK
– D/B –
Min. IV Min. IV VI
3.3 Technical data
The nameplates on the valve and actuator
provide information on the control valve version. See section2.1 and the associated actuator documentation.
Note
More information is available in Data Sheet
uT8052.
16 EB 8052 EN
Noise emission
SAMSON is unable to make general
statements about noise emission as it
depends on the valve version, plant facilities,
and process medium. On request, SAMSON
can perform calculations according to
IEC60534, Part8-3 and Part8-4 or
VDMA24422 (edition 89).
!
WARNING
Risk of hearing loss or deafness due to loud
noise.
Wear hearing protection when working near
the valve.
Design and principle of operation
EB 8052 EN 17
Design and principle of operation
Dimensions and weights
Table1 to Table3 provide a summary of the dimensions and weights of the standard version
of Type3251 Valve. The lengths and heights in the dimensional drawings are shown on
p.19.
Table1: Dimensions of Type3251 Valve, up to NPS6
Valve
Length L
(anges RF
and
welding
ends)
Height H4
H8 for
actuator
NPS ½ 1 1½ 2 3 4 6
DN 15 25 40 50 80 100 150
Class 150
Class 300
Class 600
Class 900
Class
1500
Class
2500
Class 150
to 600
Class 900
Class
1500 to
2500
350cm²
355cm²
700cm²
750cm²
in 7.25 7.25 8.75 10.00 11.75 13.88 17.75
mm 184 184 222 254 298 352 451
in 7.50 7.75 9.25 10.50 12.50 14.50 18.62
mm 190 197 235 267 318 368 473
in 8.00 8.25 9.88 11.25 13.25 15.50 20.00
mm 203 210 251 286 337 394 508
in 8.50 10.00 12.00 14.50 15.00 18.00 24.00
mm 216 254 305 368 381 457 610
in 8.50 10.00 12.00 14.50 18.50 21.50 27.75
mm 216 254 305 368 470 546 705
in 10.38 12.12 15.12 17.75 22.75 26.50 36.00
mm 264 308 384 451 578 673 914
in 5.98 5.98 6.46 8.54 8.74 9.53 12.36
mm 152 152 164 217 222 242 314
in 7.32 7.32 7.68 9.88 8.74 9.53 12.36
mm 186 186 195 251 222 242 314
in 7.32 7.32 7.68 9.88 11.34 13.7 18.35
mm 186 186 195 251 288 348 466
in 9.45 9.45 9.45 9.45 9.45 9.45
mm 240 240 240 240 240 240
in 9.45 9.45 9.45 9.45 9.45 9.45 16.46
mm 240 240 240 240 240 240 418
in 9.45 9.45 9.45 9.45 9.45 9.45 16.46
mm 240 240 240 240 240 240 418
in 9.45 9.45 9.45 9.45 9.45 9.45 16.46
mm 240 240 240 240 240 240 418
–
18 EB 8052 EN
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