Samson 3351 Service manual

Mounting and
Operating Instructions
EB 8039 EN
Edition February 2014
Type 3351 Pneumatic On/off Valve
Type 3351 Pneumatic On/off Valve Type 3351 Pneumatic On/off Valve
Version with manual override

2 EB 8039 EN
Denition of the signal words used in these mounting and operating instructions
WARNING!
indicates a hazardous situation which,
if not avoided, could result in death or
serious injury.
Note:
Additional information


EB 8039 EN 3
Contents
1 General safety instructions.............................................................................4
2 Process medium and scope of application.......................................................5
2.1 Transportation and storage.............................................................................5
3 Design and principle of operation ..................................................................5
4 Installation....................................................................................................8
4.1 Control pressure line ......................................................................................8
5 Operation.....................................................................................................8
5.1 Start-up.........................................................................................................8
6 Maintenance – Replacing parts ......................................................................9
6.1 Disassembly (DN 15 to 80) ............................................................................9
6.2 Assembly (DN 15 to 80)................................................................................. 10
6.3 Disassembly (DN 100).................................................................................11
6.4 Assembly (DN 100) .....................................................................................12
6.5 Function test ................................................................................................12
7 Nameplate..................................................................................................14
8 Customer service.........................................................................................15
For dimensions and weights of Type3351-1 uData Sheet T8039 EN.
Refer to the SAMSON website (www.samson.de) for more product documentation.
Contents Page

General safety instructions
4 EB 8039 EN
1 General safety instructions
−The valve must be mounted, started up or serviced by fully trained and qual-
ied personnel only; the accepted industry codes and practices are to be ob-
served. Make sure employees or third persons are not exposed to any dan-
ger.
−All safety instructions and warnings given in these mounting and operating
instructions, particularly those concerning installation, start-up and mainte-
nance, must be strictly observed.
−According to these mounting and operating instructions, trained person-
nel refers to individuals who are able to judge the work they are assigned
to and recognize possible dangers due to their specialized training, their
knowledge and experience as well as their knowledge of the applicable
standards.
−The valves comply with the requirements of the European Pressure Equipment
Directive 97/23/EC. The declaration of conformity issued for a valve bear-
ing the CE marking includes information on the applied conformity assess-
ment procedure. The declaration of conformity is available on request.
−To ensure appropriate use, only use the valve in applications where the op-
erating pressure and temperatures do not exceed the specications used for
sizing the valve at the ordering stage.
−The manufacturer does not assume any responsibility for damage caused by
external forces or any other external factors.
−Any hazards that could be caused in the valve by the process medium, op-
erating pressure or by moving parts are to be prevented by taking appropri-
ate precautions.
−Proper transport, storage, installation, operation and maintenance are as-
sumed.
Note: Non-electric actuators and control valve versions do not have their own potential ig-
nition source according to the ignition risk assessment stipulated in EN13463-1: 2009, sec-
tion 5.2, even in the rare incident of an operating fault. Therefore, they do not fall within the
scope of Directive 94/9/EC.
For connection to the equipotential bonding system, observe the requirements specied in
section 6.3 of EN60079-14: 2011 (VDE0165 Part 1).

Process medium and scope of application
EB 8039 EN 5
2 Process medium and scope of application
Type3351 On/off Valve with tight shutoff for liquids, gases and vapors according to DIN or
ANSI standards.
Valve sizes DN 15 to 100 ∙NPS ½ to 4
Pressure rating PN 10 to 40 ∙ Class150 and 300
Ambient temperature range –35 to 100 °C ∙ –30 to 212°F
Medium temperature range –50 to 250°C ∙ –58 to 482°F
2.1 Transportation and storage
The valve must be carefully handled, transported and stored. Protect the valve against ad-
verse inuences, such as dirt, moisture or frost, during storage and transportation. Do not re-
move the protective caps from the valve ports until immediately before installing the valve in-
to the pipeline.
When valves are too heavy to be lifted by hand, fasten the lifting sling at a suitable place on
the valve body support on the valve.
WARNING!
Incorrectly attached lifting slings or supports.
The valve can be damaged or fall.
Fasten slings or supports to the valve body and secure against slipping.
3 Design and principle of operation
See Fig. 1 on page 7.
Standard version for pressure rating PN 10 to 40 or Class 150 and 300, fail-close or fail-open
Type 3351 · On/off valve with self-adjusting PTFE-V ring packing in nominal size DN 15 to
100 (NPS ½ to 4) for medium temperatures from –10 to 220°C (14 to 428°F)
Type 3351 with bellows seal · On/off valve with bellows seal and PTFE-V ring packing in
nominal size DN 15 to 50 (NPS ½ to 2) for medium temperatures from –50 to 250°C (–58
to 482°F)
Type 3351 with insulating section · On/off valve with insulating section and plug stem sealed
by a PTFE-V ring packing in nominal size DN 15 to 50 (NPS ½ to 2) for medium temperatures
from –50 to 250°C (–58 to 482°F)

Design and principle of operation
6 EB 8039 EN
Principle of operation
The connected pneumatic control pressure
(5.8) opposes the force of the spring (5.5) to
open or close the valve.
Depending on the design of the valve seat (2)
and where the plug (3) is located inside the
valve, the valve has two different fail-safe ac-
tions which become effective when the pres-
sure is relieved from the diaphragm (5.4) or
the supply of control pressure fails.
Fail-close version
Upon failure of the control pressure, the valve
is closed by the spring.
Fail-open valve
Upon failure of the control pressure, the valve
is opened by the spring.
For versions with the optional handwheel (6),
a fail-close valve can be opened and a fail-
open valve can be closed in the event of sup-
ply air failure.
Direction of ow
The direction of the medium ow in the valve
depends on the process medium and the se-
lected fail-safe action.
For fail-close valves which are used to con-
trol gases and vapors, the medium must ow
against the valve plug in the closing direction
(A B), except for the DN100 version, in
which the medium must ow into the plug in
the opening direction (B A).
For control applications with liquids, the me-
dium must ow into the plug in the opening
direction (B A).
In fail-open valves, all media must ow in the
opening direction (A B).
Control pressure and maximum differential
pressure Δpmax
Table 3 on page 13 shows the correlation
between control pressure and max. differen-
tial pressure Δp based on the process medi-
um used.
Legend for Fig. 1:
1Valve body
1.1 Nuts
1.2 Gasket
2 Seat
3 Plug assembly
3.1 Plug stem
3.2 Lock nut
3.3 Washer
4 Packing
4.1 Spring
4.2 PTFE V-ring packing
4.3 Washer
5Valve bonnet
5.1 Guide bushing
5.2 Threaded bushing
5.4 Diaphragm
5.5 Spring
5.6 Spring plate
5.7 Top diaphragm case
5.8 Connection for control pressure
5.9 Nuts and bolts with washers
6 Handwheel (optional)
7Bonnet with actuator (DN100 only)
7.1 Diaphragm plate
7.2 Nut/lock nut
7.3 Nut
7.4 Flattened area

Design and principle of operation
EB 8039 EN 7
Fig. 1: Functional diagram
R
5.8
5.7 7.3
7.1
7.4
7.2
7
A B
1.1
1.2
2
3
1
6
5.7
5.4
5.6
5.5
3.2
3.1
5
5.2
4.2
4
4.3
4.1
5.1
5.9
3.3
3
5.8
A
A
DN100 version
Type 3351 Pneumatic On/off Valve
DN15 to 80 version
with handwheel
Fail-open R=47mm
Fail-close R=64mm
Fail-openFail-close
DN15 to 50
Version with bellows seal
Fail-close
Fail-open Fail-close
Detailed view:
Connection for
control pressure
G ¼ female
thread

Installation
8 EB 8039 EN
4 Installation
Install the control valve with the actuator in the
upright position.
Flush and clean the pipeline thoroughly be-
fore installing the valve.
Note:
Make sure the valve is installed free of
stress. If necessary, support the pipe-
lines near the connections. Do not at-
tach supports directly to the valve or
actuator.
4.1 Control pressure line
Connect the control pressure line to the con-
nection (5.8) on the top diaphragm case
(5.7). Connection with G¼ female thread.
5 Operation
5.1 Start-up
First start up the valve after mounting all parts.
As a general rule: open and close shut-off
valves slowly. Open the shut-off valves rst
on the upstream pressure side (upstream of
the valve). Afterwards, open all the valves on
the consumer side (downstream of the valve).
6 Maintenance – Replacing
parts
See Fig. 1 on page 7.
The on/off valve is subject to normal wear,
especially at the seat and plug. Depending
on the operating conditions, check the valve
at regular intervals to prevent possible failure
before it can occur.
We recommend removing the parts, cleaning
them, and, if necessary, replacing them with
new ones.
Before starting any work on the valve body,
disconnect and remove the control pressure
line as well as the actuator.
WARNING!
Valves are not free of cavities. In par-
ticular, residual process medium might
still be contained in the valve version
with bellows seal.
Process medium can escape uncon-
trolled on dismantling the valve.
Risk of personal injury!
Depressurize and drain the valve be-
fore removing it from the pipeline.
When used at high temperatures, al-
low the plant section to cool down to
ambient temperature.
External leakage can indicate that the dia-
phragm (5.4) and, in the special version, the
PTFE V-ring packing (4.2) are defective.
If the valve does not close tightly, tight shut-
off may be impaired by dirt stuck between the
seat (2) and plug (3) or by damaged facings.


Maintenance – Replacing parts
EB 8039 EN 9
Fig. 2: Mounting device (DN15 to 80) Fig. 3: Alignment of the spring
Washer
Mounting device
Spacer used for
disassembly
Spring
The procedures to disassemble the fail-close
and fail-open valve are not the same as the
plug is located differently in the valves.
A mounting device (see Fig. 2 and Table 1) is
needed as the spring (5.5) in the actuator is
preloaded.
To take out the seat ring, a special seat tool
(Table 1) is necessary.
Refer to Table 2 for the required tightening
torques.
6.1 Disassembly (DN 15 to 80)
1. Remove nuts and bolts on the actuator. For
versions with handwheel, turn the wheel to
remove any tension acting on the spring
plate (5.6). Lift off diaphragm case (5.7)
and remove diaphragm.
2.
Place spacer (approx. 5mm thick) on the
spring plate as shown in Fig. 2. Place
mounting device on top and fasten using
the three clamping nuts and bolts. Tighten
nuts so that the spring plate (5.6) is pre-
loaded evenly. This causes the plug (3) to
start moving away from the seat.

Maintenance – Replacing parts
10 EB 8039 EN
3. Undo threaded bushing (5.2) completely.
Spray the lock nut (3.2) stuck to the plug
stem with adhesive as well as the ends of
the plug stem with solvent. Use a hot-air
gun to soften the adhesive and undo the
lock nut (3.2). Position plug wrench (see
Table 1) or hex screwdriver (DN65/80)
and carefully turn the plug stem clockwise
until its height has changed by approx.
6 mm.
4.
Unthread the clamping bolts of the mount-
ing device as well as the plug stem grad-
ually until the plug stem is unscrewed out
of the spring plate (5.6). Remove spring
plate and spring. Unscrew lock nut (3.2).
5. Remove valve bonnet (5) from valve body
and carefully pull it up, for fail-close ver-
sion over the plug stem, and for fail-open
version together with the plug stem.
6. If you want to replace the seat and/or the
plug in fail-close version, the seat needs
to be removed. Position the seat wrench
on the seat (observe tightening torque
specied in Table 2) (over the plug stem
in fail-close version) so that its recess-
es are aligned with the seat's spigots. In-
sert the guide part of the seat wrench in-
to the body and unscrew seat with a suit-
able tool extension.
7.
Thoroughly clean all parts. Remove gas-
ket (1.2). If the packing leaks, unscrew the
threaded bushing (5.2) in the valve bon-
net and remove the individual parts, such
as V-ring packing (4.2), washer (4.3),
and spring (4.1). When replacing the
plug with a new one, the packing rings
(4.2) need to be renewed as well.
6.2 Assembly (DN 15 to 80)
1. In the fail-close version, rst place the
plug in the body. In the fail-open version,
push plug into the valve bonnet. Carefully
degrease the plug stem thread.
2.
Apply sealant (order no. 8150-0119)
to the seat and screw it in using the seat
wrench (observe tightening torque accord-
ing to Table 2).
3.
Packing: rst insert spring (4.1) and wash-
er (4.3) into the packing chamber, then
the V-ring packing parts (4.2) after ap-
plying lubricant (order no. 8150-0111)
to them. Loosely screw in threaded bush-
ing (5.2).
4.
Insert gasket (1.2) into the body. Place the
valve bonnet (5) on the body. In the fail-
close version, lift the plug stem and care-
fully guide it through the packing. Thread
the lock nut (3.2) onto the plug stem until
it reaches the thread end. Place on wash-
er (3.3).
5.
Insert spring (5.5) into the valve bonnet
and align it according to Fig. 3. Screw
spring plate (5.6) on the plug stem by
hand until it rests on the spring. Align the
cam of the spring plate cams so that it
is positioned above the recess of the dia-
phragm case.
6.
Screw on mounting device. Evenly tight-
en clamping bolts until the spring is pre-
loaded approx. 6mm by the spring plate.
7. Apply adhesive (order no. 8121-9014) to
the plug stem thread. Place on the plug
wrench or hex screwdriver and turn the
plug stem counterclockwise as far as it

Maintenance – Replacing parts
EB 8039 EN 11
will go on the plug. In the fail-close ver-
sion, continue to load the mounting de-
vice gradually until its three stop bushings
touch the diaphragm case. In the fail-open
version, continue to load the mounting de-
vice gradually until the stop bushings are
approx. 2mm away from the diaphragm
case. Turn plug in this position counter-
clockwise as far as it will go, then tighten
lock nut (3.2). Remove mounting device.
8.
Insert diaphragm (5.4), place diaphragm
case on top and fasten down evenly.
Tighten threaded bushing (5.2) as far as
it will go.
6.3 Disassembly (DN 100)
1. Remove nuts and bolts on the actuator. For
versions with handwheel, turn the hand-
wheel in order to remove any tension act-
ing on the diaphragm plate (7.1). Lift off
diaphragm case (5.7).
2. Undo nut (7.3) and unscrew it while hold-
ing the plug stem stationary at the milled
part with an open-end wrench (width
across ats 14).
3.
Remove diaphragm plate and springs.
Unscrew nut (7.2) together with lock nut.
4.
Carefully lift the valve bonnet (7). In the
fail-close version, lift it over the plug stem,
and in the fail-open version, lift it togeth-
er with the plug stem.
5.
If you want to replace the seat and/or
the plug in the fail-close version, the seat
needs to be removed. Position the seat
wrench on the seat (Table 1) over the
plug stem in the fail-close version so that
its recesses are aligned with the cams of
the seat. Insert the guide part of the seat
wrench into the body and unscrew seat
with a suitable tool extension.
6.
Thoroughly clean all parts. Remove gas-
ket (1.2). If the packing leaks, unscrew the
threaded bushing (5.2) in the valve bon-
net and remove the individual parts, such
as V-ring packing (4.2), washer (4.3),
and spring (4.1). When replacing the
plug with a new one, the packing rings
(4.2) need to be renewed as well. Thor-
oughly clean all parts as well as the pack-
ing chamber.

Maintenance – Replacing parts
12 EB 8039 EN
6.4 Assembly (DN 100)
1. In the fail-close version, rst place the plug
in the body. In the fail-open version, push
plug into the valve bonnet.
2. Apply sealant (order no. 8150-0119)
to the seat and screw it in using the seat
wrench (observe tightening torque accord-
ing to Table 2).
3.
Packing: rst insert spring (4.1) and wash-
er (4.3) into the packing chamber, then
the V-ring packing parts (4.2) after ap-
plying lubricant (order no. 8150-0111)
to them. Loosely screw in threaded bush-
ing (5.2).
4.
Insert gasket (1.2) into the body. Place the
valve bonnet (5) on the body. In the fail-
close version, lift the plug stem and care-
fully guide it through the packing. Fasten
valve bonnet by tightening the nuts (1.1)
evenly. Screw lock nut (3.2) onto the plug
stem until it reaches the end of the thread.
Place washer (3.3) on top.
5. Screw nut and lock nut onto the plug stem
according to the dimension R (Fig. 1 on
page 7) and tighten. On doing so,
make sure the plug rests on the seat.
6.
Insert springs into the valve bonnet and
align the end of the springs towards the
middle.
7.
Place diaphragm plate on the end of the
plug stem (3.1), while pulling the plug
stem as far as it will possibly go out of the
valve. Screw nut (7.3) on tight, while hold-
ing the plug stem stationary at the milled
part with an open wrench (width across
ats 14).
8.
Align the holes in the diaphragm, place
diaphragm case on top and fasten tight
by tightening the nuts and bolts (5.9)
evenly.
6.5 Function test
After reassembling the valve, we recommend
performing a function test to check whether
the valve functions properly.
To proceed, connect a suitable source of com-
pressed air to the control pressure connection
on the diaphragm case.
Fail-close version:
The valve must be closed when 0 bar air pres-
sure is applied. It must start to open when at
least 3bar is applied and be completely open
at 6bar.
Fail-open version:
The valve must still be open when 0.5 bar air
pressure is applied and completely closed at
4.5bar.
Control pressure and maximum differential
pressure Δpmax
Table 3 shows the correlation between control
pressure and max. differential pressure Δp
based on the process medium used.
The max. differential pressure depends on the
control pressure and can be adapted to the
operating conditions by SAMSON before de-
livery.

Maintenance – Replacing parts
EB 8039 EN 13
Table 1: Special tools
Special tool
Valve size DN 15 to 25
NPS ½ to 1
DN 32 to 50
NPS 1½ to 2
DN 65 and DN 80
NPS 2½ to 3
DN 100
NPS 4
Tool Order no.
Mounting device 1281-0036 1281-0037 1281-0038 –
Seat wrench 1280-0040 1280-0041 1280-0042 1281-0043
Plug wrench 1281-0049 1281-0049 – –
Table 2: Tightening torques
Component Tightening torques
Nuts (1.1) M10/20 Nm M12/35 Nm M16/90 Nm M20/170 Nm
Threaded bushing (5.2) M20 x 1.5/20 Nm M20 x 1.5/80 Nm M26 x 1.5/110 Nm M26 x 1.5/110 Nm
Nuts (5.9) M6/13 Nm M8/18 Nm M8/18 Nm M8/18 Nm
Plug stem (3.1) 150Nm 400Nm 850Nm 1050Nm
Table 3: Control pressure and maximum differential pressure Δpmax
Valve size DN 15 20 25 32 40 50 65 80 100
NPS ½ ¾ 1 –1½ 2 2½ 3 4
Flow coefcient KVS 6.3 10 14 25 31 40 72 90 170
CV7.5 12 16 –36 47 84 105 200
Max. control pressure1) 6 bar/88 psi
Standard version
Fail-close
Min. control pressure to open the
valve at Δpmax
4 bar/58 psi
Max. perm.
differential
pressure Δpmax
Vapors, gases A B 20bar/290psi 16 bar/235 psi 10 bar/145 psi 10bar/
145 psi
Liquids B A 16 bar/235 psi 10 bar/145 psi 5bar/73psi
Fail-open
Min. control pressure to close the
valve at Δpmax
4.5bar/65psi 4bar/
58psi
Max. permissible differential pressure
Δpmax for steam, gases or liquids 20bar/290psi 16bar/235psi 10bar/145psi
Special version for fail-close version for higher differential pressure Δp
Min. control pressure to open the
valve at Δpmax
5.5bar/80psi –
Max. permissible differential pressure
Δpmax for steam, gases or liquids 2) 30bar/435psi 20bar/290psi 7bar/102psi –
1) The pressure must not exceed the nominal pressure of the valve body.
2) For direction of ow B A

Nameplate
14 EB 8039 EN
7 Nameplate
The nameplate includes all details required to
identify the on/off valve.
3351-
3 -
1Type 3351 - Modication index
2 Serial number
3Flow coefcient (KVS/CV)
4
Seal
PT Soft seal with PTFE/glass
PTI Soft seal with PTFE/stainless steel
STV Pure Stellite
ST Stellite faced
ME Metal seal
PK Soft seal with PEEK
NI Metal seal with nickel or Inconel
5Marking (e.g. marking)
6Year of manufacture
Fig. 4: Nameplate
1
2
3 4
Made in France
5
6

Customer service
EB 8039 EN 15
8 Customer service
If malfunctions or defects occur, contact the SAMSON After-sales Service Department for sup-
port.
The addresses of SAMSON AG, its subsidiaries, representatives and service facilities world-
wide can be found on the SAMSON website, in all SAMSON product catalogs or on the back
of these Mounting and Operating Instructions.
Please send your inquiries to: ser[email protected]
To assist diagnosis, specify the following details (see section 7 and valve labeling):
−Type, model number, nominal size of valve
−Order number
−Serial number
−Fail-safe position (fail-close or fail-open)
−Control pressure
−Medium
−Pressure and temperature of the process medium
−KVS/CV coefcient
−Installation drawing showing the exact location of the valve and all the additionally in-
stalled components (shut-off valves, pressure gauge, etc.)
−For return inquiries: Phone number or e-mail address
Note:
For dimensions and weights of the valves uData Sheet T8039 EN.


SAMSON AG · MESS- UND REGELTECHNIK
Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: [phone] · Fax: [phone]
Internet: http://www.samson.de EB 8039 EN
2014-03-12