Samson 3351 Service manual

Translation of original instructions
EB 8039 EN
Type 3351 Pneumatic On/off Valve Type 3351 Pneumatic On/off Valve
Version with handwheel
Edition September 2023
Type 3351 Pneumatic On/off Valve

Denition of signal words
Hazardous situations which, if not avoided,
will result in death or serious injury
Hazardous situations which, if not avoided,
could result in death or serious injury
Property damage message or malfunction
Additional information
Recommended action
DANGER
!
WARNING
!
NOTICE
!
Note
Tip
EB 8039 EN
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. The images shown in
these instructions are for illustration purposes only. The actual product may vary.
ÎFor the safe and proper use of these instructions, read them carefully and keep them for
later reference.
ÎIf you have any questions about these instructions, contact SAMSON‘s After-sales Service
([e-mail]).
Documents relating to the device, such as the mounting and operating
instructions, are available on our website at www.samsongroup.com >
Service & Support > Downloads > Documentation.

Contents
EB 8039 EN
1 Safety instructions and measures ................................................................1-1
1.1 Notes on possible severe personal injury ......................................................1-4
1.2 Notes on possible personal injury ................................................................1-4
1.3 Notes on possible property damage.............................................................1-6
1.4 Warnings on the device...............................................................................1-7
2 Markings on the device ..............................................................................2-1
2.1 Valve nameplate .........................................................................................2-1
3 Design and principle of operation ...............................................................3-1
3.1 Versions .....................................................................................................3-3
3.2 Additionalttings........................................................................................3-3
3.3 Accessories ................................................................................................3-3
3.4 Technical data ............................................................................................3-4
4 Shipment and on-site transport ...................................................................4-1
4.1 Accepting the delivered goods .....................................................................4-1
4.2 Removing the packaging from the valve........................................................4-1
4.3 Transporting and lifting the valve..................................................................4-1
4.3.1 Transporting the valve .................................................................................4-2
4.3.2 Lifting the valve...........................................................................................4-3
4.4 Storing the valve.........................................................................................4-4
5 Installation.................................................................................................5-1
5.1 Installation conditions..................................................................................5-1
5.2 Preparation for installation...........................................................................5-2
5.3 Mounting the device....................................................................................5-3
5.3.1 Mounting the actuator onto the valve............................................................5-4
5.3.2 Installing the valve into the pipeline ..............................................................5-4
5.4 Testing the installed valve.............................................................................5-5
5.4.1 Leakage .....................................................................................................5-6
5.4.2 Fail-safe action ...........................................................................................5-6
5.4.3 Pressure test................................................................................................5-6
6 Start-up .....................................................................................................6-1
6.1 Start-up/putting the valve back into operation...............................................6-1
6.2 Function testing...........................................................................................6-2
7 Operation..................................................................................................7-1
7.1 Normal operation .......................................................................................7-1
7.2 Manual operation .......................................................................................7-1

Contents
EB 8039 EN
8 Malfunctions ..............................................................................................8-1
8.1 Troubleshooting ..........................................................................................8-1
8.2 Emergency action .......................................................................................8-2
9 Servicing....................................................................................................9-1
9.1 Periodic testing ...........................................................................................9-3
9.2 Preparing the valve for service work.............................................................9-4
9.3 Installing the valve after service work............................................................9-4
9.4 Service work...............................................................................................9-4
9.4.1 Disassembly(DN15to80/NPS½to3).......................................................9-6
9.4.2 Assembly(DN15to80/NPS½to3)...........................................................9-7
9.4.3 Disassembly(DN100/NPS4).....................................................................9-8
9.4.4 Assembly(DN100/NPS4) .........................................................................9-8
9.5 Ordering spare parts and operating supplies ................................................9-9
10 Decommissioning .....................................................................................10-1
11 Removal ..................................................................................................11-1
11.1 Removing the valve from the pipeline..........................................................11-1
11.2 Relieving the spring compression in the actuator..........................................11-2
12 Repairs ....................................................................................................12-1
12.1 Returning devices to SAMSON ..................................................................12-1
13 Disposal...................................................................................................13-1
14 Certicates...............................................................................................14-1
15 Annex......................................................................................................15-1
15.1 Tightening torques, lubricants and tools ......................................................15-1
15.2 Spare parts ..............................................................................................15-2
15.3 After-sales service.....................................................................................15-3
15.4 Information on the UK sales region.............................................................15-3

EB 8039 EN 1-1
Safety instructions and measures
1 Safety instructions and measures
Intended use
TheType3351PneumaticControlValveconsistsofanon/offvalveandapneumaticactua-
tor. The valve is designed as a shut-off valve with tight shut-off for liquids, gases and vapors.
Thevalveandactuatoraredesignedtooperateunderexactlydenedconditions(e.g.oper-
ating pressure, process medium, temperature). Therefore, operators must ensure that the con-
trolvalveisonlyusedinoperatingconditionsthatmeetthespecicationsusedforsizingthe
valve at the ordering stage. In case operators intend to use the control valve in applications
orconditionsotherthanthosespecied,contactSAMSON.
SAMSON does not assume any liability for damage resulting from the failure to use the de-
vice for its intended purpose or for damage caused by external forces or any other external
factors.
ÎRefer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denedduringsizingandbythetechnicaldata
− Useoutsidethelimitsdenedbythevalveaccessoriesconnectedtothe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
Qualicationsofoperatingpersonnel
The control valve must be mounted, started up, serviced and repaired by fully trained and
qualiedpersonnelonly;theacceptedindustrycodesandpracticesmustbeobserved.Ac-
cording 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.
Personal protective equipment
Werecommendcheckingthehazardsposedbytheprocessmediumbeingused(e.g.
uGESTIS(CLP)hazardoussubstancesdatabase).Dependingontheprocessmediumand/
or the activity, the protective equipment required includes:

1-2 EB 8039 EN
Safety instructions and measures
− Protective clothing, gloves, eye protection and respiratory protection in applications with
hot, cold and/or corrosive media
− Wear hearing protection when working near the valve
− Hard hat
− Safety harness, e.g. when working at height
− Safety footwear, if applicable ESD (electrostatic discharge) footwear
ÎCheckwiththeplantoperatorfordetailsonfurtherprotectiveequipment.
Revisionsandothermodications
Revisions,conversionsorothermodicationsoftheproductarenotauthorizedbySAMSON.
Theyareperformedattheuser'sownriskandmayleadtosafetyhazards,forexample.Fur-
thermore, the product may no longer meet the requirements for its intended use.
Safety features
Upon supply air or control signal failure, the valve moves to a certain fail-safe position (see
'Design and principle of operation' section).
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operat-
ing pressure, the signal pressure or by moving parts by taking appropriate precautions. Plant
operatorsandoperatingpersonnelmustobserveallhazardstatements,warningsandcau-
tion notes in these mounting and operating instructions.
Hazardsresultingfromthespecialworkingconditionsattheinstallationsiteofthevalvemust
beidentiedinariskassessmentandpreventedthroughthecorrespondingsafetyinstruc-
tions drawn up by the operator.
Responsibilities of the operator
Operators are responsible for proper use and compliance with the safety regulations. Opera-
tors are obliged to provide these mounting and operating instructions as well as the refer-
enced documents to the operating personnel and to instruct them in proper operation. Fur-
thermore, operators must ensure that operating personnel or third parties are not exposed to
any danger.
Operatorsareadditionallyresponsibleforensuringthatthelimitsfortheproductdenedin
the technical data are observed. This also applies to the start-up and shutdown procedures.
Start-up and shutdown procedures fall within the scope of the operator's duties and, as such,
are not part of these mounting and operating instructions. SAMSON is unable to make any

EB 8039 EN 1-3
Safety instructions and measures
statements about these procedures since the operative details (e.g. differential pressures and
temperatures) vary in each individual case and are only known to the operator.
Responsibilities of operating personnel
Operating personnel must read and understand these mounting and operating instructions as
wellasthereferenceddocumentsandobservethespeciedhazardstatements,warnings
and caution notes. Furthermore, operating personnel must be familiar with the applicable
health, safety and accident prevention regulations and comply with them.
Referenced standards, directives and regulations
The control valves comply with the requirements of the European Pressure Equipment Direc-
tive2014/68/EU,MachineryDirective2006/42/EC,Directive2016No.1105Pressure
Equipment(Safety)Regulations2016andDirective2008No.1597SupplyofMachinery
(Safety)Regulations2008.ValveswithaCEmarkingand/orUKCAmarkinghaveadecla-
ration of conformity, which includes information about the applied conformity assessment
procedure.The'Certicates'sectioncontainsthisdeclarationofconformity.
AccordingtotheignitionhazardassessmentperformedinaccordancewithClause5.2of
ISO80079-36,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.
ÎForconnectiontotheequipotentialbondingsystem,observetherequirementsspeciedin
Clause6.4ofEN60079-14(VDE0165-1).
Referenced documentation
The following documents apply in addition to these mounting and operating instructions:
− Mounting and operating instructions for mounted valve accessories (positioner, solenoid
valve etc.)
− When a substance is used in the device, which is listed as being a substance of very high
concernonthecandidatelistoftheREACHregulation:
Information on safe use of the part affected
uwww.samsongroup.com>AboutSAMSON>MaterialCompliance>REACH
If a device contains a substance listed as a substance of very high concern on the candi-
datelistoftheREACHregulation,thisisindicatedontheSAMSONdeliverynote.

1-4 EB 8039 EN
Safety instructions and measures
1.1 Notes on possible severe personal injury
DANGER
!
Risk of bursting in pressure equipment.
Valves and pipelines are pressure equipment. Impermissible pressure or improper open-
ing can lead to valve components bursting.
ÎObserve the maximum permissible pressure for valve and plant.
ÎBeforestartinganyworkonthecontrolvalve,depressurizeallplantsectionsaffect-
ed as well as the valve.
ÎDrain the process medium from all the plant sections concerned as well as the valve.
1.2 Notes on possible personal injury
WARNING
!
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.
ÎAllow components and pipelines to cool down or warm up to the ambient tempera-
ture.
ÎWear protective clothing and safety gloves.
Risk of hearing loss or deafness due to loud noise.
The noise emissions depend on the valve version, plant facilities and process medium.
ÎWear hearing protection when working near the valve.
Risk of personal injury due to exhaust air being vented.
While the valve is operating, air is vented from the actuator, e.g. during closed-loop op-
eration or when the valve opens or closes.
ÎInstall the control valve in such a way that vent openings are not located at eye level
and the actuator does not vent at eye level in the work position.
ÎUse suitable silencers and vent plugs.
ÎWear eye protection when working in close proximity to the control valve.

EB 8039 EN 1-5
Safety instructions and measures
WARNING
!
Risk of personal injury due to preloaded springs.
Thevalveisttedwithanactuatorwithpreloadedspringsthatareundertension.
ÎBefore starting any work on the control valve, relieve the compression from the pre-
loaded springs. See 'Relieving the spring compression in the actuator' in the 'Re-
moval' section.
Risk of personal injury due to residual process medium in the valve.
Whileworkingonthevalve,residualmediumcanowoutofthevalveand,depending
on its properties, cause personal injury, e.g. (chemical) burns.
ÎIf possible, drain the process medium from all the plant sections affected and the
valve.
ÎWear protective clothing, safety gloves, respiratory protection and eye protection.
Risk of personal injury due to pressurized components and process medium being
discharged.
ÎDonotloosenthescrewofthetestconnectionwhilethevalveispressurized.
Exposure to hazardous substances poses a serious risk to health.
Certainlubricantsandcleaningagentsareclassiedashazardoussubstances.These
substances have a special label and a material safety data sheet (MSDS) issued by the
manufacturer.
ÎMakesurethatanMSDSisavailableforanyhazardoussubstanceused.Ifneces-
sary, contact the manufacturer to obtain an MSDS.
ÎInformyourselfaboutthehazardoussubstancesandtheircorrecthandling.
Risk of personal injury due to incorrect operation, use or installation as a result of in-
formation on the valve being illegible.
Over time, markings, labels and nameplates on the valve may become covered with dirt
orbecomeillegibleinsomeotherway.Asaresult,hazardsmaygounnoticedandthe
necessary instructions not followed. There is a risk of personal injury.
ÎKeep all relevant markings and inscriptions on the device in a constantly legible
state.
ÎImmediately renew damaged, missing or incorrect nameplates or labels.

1-6 EB 8039 EN
Safety instructions and measures
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.
ÎFlush the pipelines before start-up.
Risk of valve damage due to unsuitable medium properties.
Thevalveisdesignedforaprocessmediumwithdenedproperties.
ÎOnlyusetheprocessmediumspeciedforsizingtheequipment.
Risk of leakage and valve damage due to excessively high or low tightening torques.
Observethespeciedtorqueswhentighteningcontrolvalvecomponents.Excessive
tightening torques lead to parts wearing out more quickly. Parts that are too loose may
cause leakage.
ÎObservethespeciedtighteningtorques(seethe'Tighteningtorques,lubricantsand
tools' section in the annex).
Risk of valve damage due to the use of unsuitable tools.
Certaintoolsarerequiredtoworkonthevalve.
ÎOnly use tools approved by SAMSON (see the 'Tightening torques, lubricants and
tools' section in the annex).
Risk of valve damage due to the use of unsuitable lubricants.
The lubricants to be used depend on the valve material. Unsuitable lubricants may cor-
rode and damage surfaces.
ÎOnly use lubricants approved by SAMSON (see the 'Tightening torques, lubricants
and tools' section in the annex).
Risk of the process medium being contaminated through the use of unsuitable lubri-
cants and/or contaminated tools and components.
ÎIf necessary, keep the valve and the tools used free from solvents and grease.
ÎMake sure that only suitable lubricants are used.

EB 8039 EN 1-7
Safety instructions and measures
1.4 Warnings on the device
Warning symbols Meaning of the warning Location on the device
Warning to indicate that the springs in the actua-
tor are preloaded.
Actuators with preloaded springs are under ten-
sion. Incorrect opening of the actuator can lead to
personal injury due to the sudden and uncon-
trolled projection of parts.
Before starting any work on the actuator, relieve
the compression from the preloaded springs. See
'Relieving the spring compression in the actuator'
in the 'Removal' section.

1-8 EB 8039 EN
Safety instructions and measures

EB 8039 EN 2-1
Markings on the device
2 Markings on the device
The nameplate shown was up to date at the
time of publication of this document. The
nameplate on the device may differ from the
one shown.
2.1 Valve nameplate
6 7
12
14 16
1…5
9
SAMSON
20
Fig.2-1: Inscriptions on the valve nameplate
Item Inscription meaning
1…5 PED requirements
6 Type designation
7Devicemodicationindex
9 Month and year of manufacture
12 Production number
14 Flowcoefcient:
DIN: KVS · ANSI: CV
16 Plug seal:
PT: PTFE/glass soft seal
PTI: PTFE/stainless steel soft seal
STV:CompletelyofStellite®
ST: Base material with Stellite®facing
ME: Metal base material
PK: PEEK soft seal
NI: Metal seal with nickel or Inconel®
20 Countryoforigin
Thenameplateisafxedtothefrontofthe
valvebody(seeFig.2-2).
Nameplate
Fig.2-2: Valve nameplate

2-2 EB 8039 EN

EB 8039 EN 3-1
Design and principle of operation
3 Design and principle of oper-
ation
Fail-safe action
IntheType3351Valve,theconnectedpneu-
matic 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.
Directionofow(seeTable3-1)
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
intheow-to-closedirection(AB).
ExceptfortheDN100version: the medium
mustowintheow-to-opendirection
(BA).
For control applications with liquids, the me-
diummustowintheow-to-opendirection
(BA).
Infail-openvalves,allmediamustowin
theow-to-opendirection(AB).
Table3-1: Direction of ow
Fail-safe ac-
tion
Process
medium Valve size
Flow direction
AB BA
Fail-close Vapor/gas DN15to80
NPS½to3 FTC1) –
Fail-close Vapor/gas DN100
NPS4 –FTO1)
Fail-close Liquid
DN15to
100
NPS½to4
–FTO1)
Fail-open Vapor/
gas/liquid
DN15to
100
NPS½to4
FTO1) –
1) FTO(ow-to-open)
FTC(ow-to-close)
Control pressure and max. differential
pressureΔp
Table 3-5 shows the correlation between
control pressure and max. differential pres-
sureΔpbasedontheprocessmediumused.

3-2 EB 8039 EN
Design and principle of operation
DN100version
DN15to80version
with handwheel
Spring
opens R=47mm
Spring
Closing R=64mm
Detailed view:
connection for
control pressure
withG¼female
thread
Z
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
2
1
5.8
AB
Z
R
5.8
5.7 7.3
7.1
7.4
7.2
7
Fail-openFail-close
Fail-closeFail-open
1 Valve body
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
6 Handwheel (optional)
7 Bonnet with actuator
(DN100only)
7.1 Diaphragm plate
7.2 Nut/lock nut
7.3 Nut
7.4 Flattened area
Fig.3-1: Functional diagram of Type3351 Pneumatic On/off Valve

EB 8039 EN 3-3
Design and principle of operation
3.1 Versions
Standard versionforpressureratingPN16
to40orClass125and300,fail-closeor
fail-open
Type3351 · On/off valve with self-adjusting
PTFEV-ringpackinginvalvesizeDN15to
100(NPS½to4)formediumtemperatures
from–10to+220°C(14to428°F)
Further versions:
− Additionalmanualoverride·DN15to
80(NPS½to3)
−Higher ambient temperatures
−Version without PTFE for the tobacco in-
dustry
−Adjustable packings
−Packings with special materials
3.2 Additionalttings
Strainers
We recommend installing a SAMSON
strainer upstream of the valve. It prevents sol-
id particles in the process medium from
damaging the valve.
Bypass and shut-off valves
We recommend installing a shut-off valve
both upstream of the strainer and down-
stream of the valve and installing a bypass
line. The bypass ensures that the plant does
not need to be shut down for service and re-
pair work on the valve.
Test connection
Particularly for liquids and vapors, we rec-
ommend installing a suitable leakage indica-
tor (e.g. a contact pressure gauge, an outlet
to an open vessel or an inspection glass) at
the test connection.
Safety guard
For operating conditions that require in-
creased safety (e.g. in cases where the valve
is freely accessible to untrained staff), a safe-
ty guard must be installed to rule out a crush
hazardarisingfrommovingparts(actuator
and plug stem). Plant operators are responsi-
ble for deciding whether a guard is to be
used. The decision is based on the risk posed
by the plant and its operating conditions.
3.3 Accessories
SAMSON provides mounting kits with addi-
tional parts to mount valve accessories (e.g.
Type3768LimitSwitch,Type3730Position-
er). Specify the item number listed in Table
3-6 to order the suitable mounting kit from
SAMSON.

3-4 EB 8039 EN
Design and principle of operation
3.4 Technical data
The nameplates on the valve and actuator
provide information on the control valve ver-
sion. See the 'Markings on the device' sec-
tion.
More information is available in Data Sheet
uT8039.
Noise emissions
SAMSON is unable to make general state-
ments about noise emissions. The noise emis-
sions depend on the valve version, plant fa-
cilities and process medium.
Note
Table3-2: Technical data
Version DIN ANSI
Body
material
Castiron
EN-GJL-250
Spheroidal
graphite iron
EN-GJS-400-
18-LT
Caststeel
1.0619
Caststainless
steel 1.4408
Castiron
A126B
Caststeel
A216WCC
Caststainless
steel A351
CF8M
Pressure
rating PN16 PN16,25 PN16,25,40 Class125 Class150and 300
Class150and
300
Valvesize DN15to100 NPS½to4
Connecting
anges
Form B according to
EN1092-2
All forms according to
EN1092-1
FF according
to
ASMEB16.1
All forms
according to
ASMEB16.5
All forms
according to
ASMEB16.5
Temperature ranges in °C (°F) · Permissible operating pressures according to pressure-temperature diagrams (see
Information Sheet uT8000-2)
Medium
temperature
–10to+220°C(14to428°F) –10to+220°C(14to428°F)
Ambient
temperature
NBRactuatordiaphragm:–35to+100°C(–31to+212°F)
EPDMactuatordiaphragm:–40to+150°C(–40to+302°F)
FKMactuatordiaphragm:–25to+200°C(–13to+392°F)
Leakage
class IEC60534-4:VI ANSI/FCI70-2:ClassVI
Conformity

EB 8039 EN 3-5
Design and principle of operation
Table3-3: Materials
Valve DIN ANSI
Body Castiron
EN-GJL-250
Spheroidal
graphite iron
EN-GJS-400-
18-LT
Caststeel
1.0619
Caststainless
steel
1.4408
Castiron
A126B
Caststeel
A216WCC
Caststainless
steel A351
CF8M
Seat 1.4006 1.4404/
1.4401
A182 F6a
Cl.2
A182 F6a
Cl.2 316Ti/316L
Plug 1.4404 · Seal made of reinforced PTFE or PEEK
Body gasket Graphiteonmetalcore
Actuator
diaphragm NBR, EPDM or FKM with fabric reinforcement
Valve
bonnet
Castiron
EN-GJL-250
Caststeel
1.0619
Caststeel
1.0619
Bonnetange
1.4404
welded to
bonnet
1.0619
Castiron
A216B
Caststeel
A216WCC
Bonnetange
316L welded
to bonnet
A216WCC
Guide
bushing 1.4104 1.4404 1.4104 1.4104 316L
Packing V-ring packing: PTFE with carbon · Spring: 1.4310
Threaded
bushing 1.4404+Carbon 316L+Carbon
Table3-4: Process medium and scope of application
Valve size DN15to100 NPS½to4
Pressure rating PN 16, 25 and 40 Class125,150and300
Ambient temperature range –35to+100°C –30to+212°F
Medium temperature range –10to+220°C 14to+428°F

3-6 EB 8039 EN
Design and principle of operation
Table3-5: Control pressure and max. differential pressure Δpmax
The max. differential pressure depends on the control pressure and can be adapted to the
operating conditions by SAMSON before delivery.
Valve size DN 15 20 25 32 40 50 65 80 100
NPS ½¾ 1 – 1½ 22½ 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. supply
pressure
DN15to80 8bar/116psi
DN100 6bar/88psi
Standard version (PTFE or PEEK plug seal)
Fail-close
Min. control pressure to
openthevalveatΔpmax
PTFE 4bar/58psi
PEEK 5.5bar/80psi
Max. perm.
differential
pressure
Δpmax
Vapors,gasesAB 20bar/290psi 16bar/235psi 10bar/145psi –
Vapors,gasesBA –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
PTFE/
PEEK 4.5bar/65psi
Max. perm.
differential
pressure
Δpmax
Vapors, gases,
liquids 20bar/290psi 16bar/235psi 10bar/145psi
Specialversionforfail-closeversionwithreinforcedspringsforhigherdifferentialpressureΔp(PTFEplugseal
only)1)
Min. control pressure to open the
valveatΔpmax
5.5bar/80psi –
Max. perm.
differential
pressure
Δpmax
Vapors, gases,
liquids 2) 30bar/435psi 20bar/290psi 7bar/102psi –
1) ThestandardversionwithPEEKisalreadyttedwithreinforcedsprings.Therefore,aspecialversionwithPEEKplug
seal for higher differential pressures is not available.
2) SeeFig.3-1directionofowBA