Samson 3351 Service-Handbuch
Mounting and
Operating Instructions
EB 8039 EN
Edition May 2016
Type 3351 Pneumatic On/off Valve Type 3351 Pneumatic On/off Valve
Version with handwheel
Type 3351 Pneumatic On/off Valve
Denition 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 8039 EN
Contents
EB 8039 EN 3
1 General safety instructions.............................................................................4
2 Process medium and scope of application.......................................................5
3 Transportation and storage............................................................................5
4 Design and principle of operation ..................................................................6
5 Installation....................................................................................................8
5.1 Mounting position..........................................................................................8
5.2 Control pressure line ......................................................................................8
5.3 Accessories ...................................................................................................8
6 Start-up ........................................................................................................9
7 Maintenance ...............................................................................................10
7.1 Disassembly(DN15to80)...........................................................................10
7.2 Assembly (DN
15to80) ................................................................................ 12
7.3 Disassembly(DN100).................................................................................12
7.4 Assembly (DN
100)....................................................................................... 13
7.5 Function testing............................................................................................13
8 Nameplate..................................................................................................17
9 After-sales service .......................................................................................17
4 EB 8039 EN
General safety instructions
1 General safety instructions
−The device must be mounted, started up, or serviced by fully trained and
qualiedpersonnelonly;theacceptedindustrycodesandpracticesareto
be observed. Make sure employees or third persons are not exposed to any
danger.
−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 personnel
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 devices comply with the requirements of the European Pressure
Equipment Directive 97/23/EC. The declaration of conformity issued for a
regulator bearing the CE marking includes information on the applied
conformity assessment procedure.
The declaration of conformity is available on request.
−To ensure appropriate use, only use the device in applications where the
operatingpressureandtemperaturesdonotexceedthespecicationsused
for sizing the device 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 appro-
priate precautions.
−Proper transport, storage, installation, operation, and maintenance are as-
sumed.
EB 8039 EN 5
Process medium and scope of application
Note:
According to the ignition risk assessment performed in accordance with EN13463-1:
2009, section 5.2, the non-electrical actuators and valves do not have their own po-
tential 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. For connection to the equipo-
tential bonding system, observe the requirements specied in section 6.4 of
EN60079-14 (VDE0165 Part 1).
2 Process medium and scope of application
Type3351On/offValvewithtightshutoffforliquids,gasesandvaporsaccordingtoDINor
ANSIstandards.
Valve size DN15 to 100 NPS½ to 4
Pressure rating PN10to40 Class150and300
Ambient temperature range –35to+100°C –30to+212°F
Medium temperature range –50to+250°C –58to+482°F
TheType3351ValvebearsboththeCEandEACmarksofconformity:
·
3 Transportation and storage
ÎThe device must be carefully handled, transported, and stored.
ÎDuringstorageandtransportation,protectthedeviceagainstadverseinuences,suchas
dirt, moisture, or temperatures outside the ambient temperature range.
ÎDo not remove the protective caps from the valve ports until immediately before installing
the valve into the pipeline.
ÎWhen valves are too heavy to be lifted by hand, fasten the lifting sling to 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. Fas-
ten slings or supports to the valve body and secure against slipping.
6 EB 8039 EN
Design and principle of operation
4 Design and principle of oper-
ation
SeeFig.1.
Standard versionforpressureratingPN10
to40orClass150and300,fail-closeor
fail-open
Type 3351 · On/off valve with self-adjusting
PTFEV-ringpackinginnominalsizeDN15
to100(NPS½to4)formediumtempera-
turesfrom–10to+220°C(14to428°F)
Type3351 with bellows seal · On/off valve
with bellows seal and V-ring packing · Valve
sizeDN15to50(NPS½to2)·Medium
temperaturesfrom–50to250°C(–58to
482°F)
Type3351 with insulating section · On/off
valve with insulating section and plug stem
sealed by a PTFE V-ring packing · Valve size
DN15to50(NPS½to2)·Mediumtem-
peraturesfrom–50to+250°C(–58to
+482°F)
Principle of operation
The connected pneumatic control pressure
(5.8)opposestheforceofthespring(5.5)to
open or close the valve.
Depending on the design of the valve seat
(2)andwheretheplug(3)islocatedinside
the valve, the valve has two different fail-safe
actions which become effective when the
pressure is relieved from the diaphragm
(5.4)orthesupplyofcontrolpressurefails.
−Fail-close valve: upon failure of the con-
trol pressure, the valve is closed by the
spring.
−Fail-open valve: upon failure of the con-
trol pressure, the valve is opened by the
spring.
Forversionswiththeoptionalhandwheel(6),
a fail-close valve can be opened and a fail-
open valve can be closed in the event of con-
trol pressure failure.
1 Valve body
1.1 Nuts
1.2 Gasket
2 Seat
3 Plug
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
5 Valve 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
6Handwheel(optional)
7 Bonnet with actuator
(DN100only)
7.1 Diaphragm plate
7.2 Nut/lock nut
7.3 Nut
7.4 Flattened area
EB 8039 EN 7
Design and principle of operation
DN100version
DN15to80version
with handwheel
Fail-open R=47mm
Fail-close R=64mm
DN15to50
Version with bellows seal
Detailedview:
connection for
control pressure
withG¼female
thread
A
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
B
1.1
1.2
2
3
1
R
5.8
5.7 7.3
7.1
7.4
7.2
7
Fail-openFail-close
Fail-close
Fail-closeFail-open
Fig.1: Functional diagram of Type3351 Pneumatic On/off Valve
8 EB 8039 EN
Installation
Direction of ow
Thedirectionofthemediumowinthevalve
depends on the process medium and the se-
lected fail-safe action.
For fail-close valves which are used to con-
trolgasesandvapors,themediummustow
against the valve plug in the closing direc-
tion (A B).
ExceptfortheDN100version:themedium
mustowintotheplugintheopeningdirec-
tion (B A).
For control applications with liquids, the me-
diummustowintotheplugintheopening
direction(BA).
Infail-openvalves,allmediamustowin
the opening direction (A B).
Control pressure and max. differential pres-
sure Δp
Table4showsthecorrelationbetweencon-
trol pressure and max. differential pressure
Δpbasedontheprocessmediumused.
5 Installation
5.1 Mounting position
Installthecontrolvalvewiththeactuatorin
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
pipelines near the connections. Do
not attach supports directly to the
valve or actuator.
5.2 Control pressure line
Connect the control pressure line to the con-
nection(5.8)onthetopdiaphragmcase
(5.7).ConnectionwithG¼femalethread.
5.3 Accessories
SAMSON provides mounting kits with addi-
tional parts to attach valve accessories (e.g.
Type3768LimitSwitch,Type3730Position-
er).SpecifytheitemnumberlistedinTable1
to order the suitable mounting kit from
SAMSON.
EB 8039 EN 9
Start-up
6 Start-up
First start up the valve after mounting all
parts.
Asageneralrule:openandcloseshut-off
valves slowly.Opentheshut-offvalvesrst
on the upstream pressure side (upstream of
thevalve).Afterwards,openallthevalveson
theconsumerside(downstreamofthevalve).
Table1: Mounting accessories
Mounting
accessories for Valve size Description Item no.
(individual parts)
Item no.
(assembly)
Type3768Limit
Switch
DN15to50/
NPS½to2
Mounting accessories for
Type3768 1400-6787
1402-0101
Accessories:stemconnec-
tor and screws (according
toIEC60534-6-1)
1402-1152
DN65to
100/NPS2½
to 4
Mounting accessories for
Type3768 1400-6787
1402-0102
Accessories:stemconnec-
tor and screws (according
toIEC60534-6-1)
1402-1153
Type3730
Positioner
DN15to50/
NPS½to2
Mounting accessories for
Type3730 1400-7454
1402-1154
Accessories:stemconnec-
tor and screws (according
toIEC60534-6-1)
1402-1152
DN65to
100/NPS2½
to 4
Mounting accessories for
Type3730 1400-7454
1402-1155
Accessories:stemconnec-
tor and screws (according
toIEC60534-6-1)
1402-1153
10 EB 8039 EN
Maintenance
7 Maintenance
SeeFig.1.
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 fail-
ure 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.
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,inthespecialversion,the
PTFEV-ringpacking(4.2)aredefective.
Ifthevalvedoesnotclosetightly,tightshut-
off may be impaired by dirt stuck between
theseat(2)andplug(3)orbydamagedfac-
ings.
The procedures to disassemble the fail-close
and fail-open valve are not the same as the
plug is located differently in the valves.
Amountingdevice(seeFig.2andTable2)
isneededasthespring(5.5)intheactuator
is preloaded.
To take out the seat ring, a special seat tool
(Table2)isnecessary.
RefertoTable3fortherequiredtightening
torques.
7.1 Disassembly (DN15 to 80)
1. Remove nuts and bolts at the actuator.
For versions with handwheel, turn the
handwheel to ensure that the spring plate
(5.6)isnotundertension.Removethedi-
aphragmcase(5.7)andtakeoutthedi-
aphragm.
2. Placeshim(around5mmthick)accord-
ingtoFig.1onthespringplate.Place
on mounting device and fasten with three
clamping bolts and nuts. Turn the nuts
untilthespringplate(5.6)isevenlyload-
edslightly.Thiscausestheplug(3)tode-
tach itself from the seat.
3. Completely undo the threaded bushing
(5.2).Spraythelocknut(3.2)stuckwith
adhesive to the plug stem as well as the
ends of the plug stem with solvent. Use a
hot-air gun to soften the adhesive and
undothelocknut(3.2).Positionplug
wrench(seeTable2)orhexscrewdriver
(DN65/80)andcarefullyturntheplug
stem clockwise until its height has
changedbyapprox.6mm.
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