Samson 3351 Manuale di servizio

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

Denition 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(DN15to80)...........................................................................10

7.2 Assembly (DN



15to80) ................................................................................ 12

7.3 Disassembly(DN100).................................................................................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

qualiedpersonnelonly;theacceptedindustrycodesandpracticesareto

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

operatingpressureandtemperaturesdonotexceedthespecicationsused

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 EN13463-1:

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 specied in section 6.4 of

EN60079-14 (VDE0165 Part 1).

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 size 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

TheType3351ValvebearsboththeCEandEACmarksofconformity:

3 Transportation and storage

ÎThe device must be carefully handled, transported, and stored.

ÎDuringstorageandtransportation,protectthedeviceagainstadverseinuences,suchas

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

SeeFig.1.

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tempera-

turesfrom–10to+220°C(14to428°F)

Type3351 with bellows seal · On/off valve

with bellows seal and V-ring packing · Valve

sizeDN15to50(NPS½to2)·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 · Valve size

DN15to50(NPS½to2)·Mediumtem-

peraturesfrom–50to+250°C(–58to

+482°F)

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

actions which become effective when the

pressure is relieved from the diaphragm

(5.4)orthesupplyofcontrolpressurefails.

−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.

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 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

(DN100only)

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

DN100version

DN15to80version

with handwheel

Fail-open R=47mm

Fail-close R=64mm

DN15to50

Version with bellows seal

Detailedview:

connection for

control pressure

withG¼female

thread

5.4

5.6

5.5

3.2

3.1

5.2

4.2

4.3

4.1

5.1

5.9

3.3

5.8

1.1

1.2

5.8

5.7 7.3

7.1

7.4

7.2

Fail-openFail-close

Fail-close

Fail-closeFail-open

Fig.1: Functional diagram of Type3351 Pneumatic On/off Valve

8 EB 8039 EN

Installation

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 direc-

tion (A B).

ExceptfortheDN100version:themedium

mustowintotheplugintheopeningdirec-

tion (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 max. differential pres-

sure Δp

Table4showsthecorrelationbetweencon-

trol pressure and max. differential pressure

Δpbasedontheprocessmediumused.

5 Installation

5.1 Mounting position

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

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)onthetopdiaphragmcase

(5.7).ConnectionwithG¼femalethread.

5.3 Accessories

SAMSON provides mounting kits with addi-

tional parts to attach valve accessories (e.g.

Type3768LimitSwitch,Type3730Position-

er).SpecifytheitemnumberlistedinTable1

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.

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).

Table1: Mounting accessories

Mounting

accessories for Valve size Description Item no.

(individual parts)

Item no.

(assembly)

Type3768Limit

Switch

DN15to50/

NPS½to2

Mounting accessories for

Type3768 1400-6787

1402-0101

Accessories:stemconnec-

tor and screws (according

toIEC60534-6-1)

1402-1152

DN65to

100/NPS2½

to 4

Mounting accessories for

Type3768 1400-6787

1402-0102

Accessories:stemconnec-

tor and screws (according

toIEC60534-6-1)

1402-1153

Type3730

Positioner

DN15to50/

NPS½to2

Mounting accessories for

Type3730 1400-7454

1402-1154

Accessories:stemconnec-

tor and screws (according

toIEC60534-6-1)

1402-1152

DN65to

100/NPS2½

to 4

Mounting accessories for

Type3730 1400-7454

1402-1155

Accessories:stemconnec-

tor and screws (according

toIEC60534-6-1)

1402-1153

10 EB 8039 EN

Maintenance

7 Maintenance

SeeFig.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,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fac-

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.

Amountingdevice(seeFig.2andTable2)

isneededasthespring(5.5)intheactuator

is preloaded.

To take out the seat ring, a special seat tool

(Table2)isnecessary.

RefertoTable3fortherequiredtightening

torques.

7.1 Disassembly (DN15 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)isnotundertension.Removethedi-

aphragmcase(5.7)andtakeoutthedi-

aphragm.

2. Placeshim(around5mmthick)accord-

ingtoFig.1onthespringplate.Place

on mounting device and fasten with three

clamping bolts and nuts. Turn the nuts

untilthespringplate(5.6)isevenlyload-

edslightly.Thiscausestheplug(3)tode-

tach itself from the seat.

3. Completely undo the threaded bushing

(5.2).Spraythelocknut(3.2)stuckwith

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

undothelocknut(3.2).Positionplug

wrench(seeTable2)orhexscrewdriver

(DN65/80)andcarefullyturntheplug

stem clockwise until its height has

changedbyapprox.6mm.

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