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