Samson 42-20 Service manual

Translation of original instructions
EB 3007 EN
Type42-20 and Type42-25 Differential Pressure Regulators
Self-operated Regulators · Opening Actuator
Type 42-20 Differential Pressure Regulator Type 42-25 Differential Pressure Regulator
Edition October 2022

Definition 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 3007 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]).
The mounting and operating instructions for the devices are included
in the scope of delivery. The latest documentation is available on our
website at www.samsongroup.com > Service & Support > Downloads >
Documentation.

Contents
EB 3007 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 ................................................................1-5
1.3 Notes on possible property damage.............................................................1-7
2 Markings on the device ..............................................................................2-1
2.1 Nameplates................................................................................................2-1
2.2 Location of the nameplates ..........................................................................2-2
2.3 Materialidenticationnumber .....................................................................2-2
2.3.1 Type 2422 Valve.........................................................................................2-2
2.3.2 Type2420andType2425Actuators............................................................2-2
3 Design and principle of operation ...............................................................3-1
3.1 Additionalttings........................................................................................3-4
3.2 Technical data ............................................................................................3-5
4 Shipment and on-site transport ...................................................................4-1
4.1 Accepting the delivered goods .....................................................................4-1
4.2 Removing the packaging from the regulator..................................................4-1
4.3 Transporting and lifting the regulator............................................................4-2
4.3.1 Transporting the regulator............................................................................4-2
4.3.2 Lifting the regulator.....................................................................................4-3
4.4 Storing the regulator ...................................................................................4-4
5 Installation.................................................................................................5-1
5.1 Installation conditions..................................................................................5-1
5.2 Preparation for installation...........................................................................5-4
5.3 Installation..................................................................................................5-5
5.3.1 Installing the regulator.................................................................................5-6
5.4 Testing the regulator....................................................................................5-7
5.4.1 Leak test.....................................................................................................5-8
5.4.2 Pressure test................................................................................................5-8
5.4.3 Filling the plant...........................................................................................5-9
5.4.4 Cleaning the pipeline ................................................................................5-10
5.5 Insulation .................................................................................................5-10
6 Start-up .....................................................................................................6-1
6.1 Start-up and putting the regulator back into operation ...................................6-1
6.2 Starting up the plant....................................................................................6-2
7 Operation..................................................................................................7-1
7.1 Adjusting the differential pressure set point ...................................................7-1

Contents
EB 3007 EN
8 Malfunctions ..............................................................................................8-1
8.1 Troubleshooting ..........................................................................................8-1
8.2 Emergency action .......................................................................................8-3
9 Servicing....................................................................................................9-1
9.1 Preparing the valve for service work.............................................................9-5
9.2 Installing the regulator after service work ......................................................9-5
9.3 Service work...............................................................................................9-5
9.4 Replacing the actuator.................................................................................9-6
9.5 Replacing the seat and plug.........................................................................9-6
9.6 Replacing the actuator's operating diaphragm ..............................................9-6
9.6.1 Type2420Actuator ....................................................................................9-6
9.6.2 Type2425Actuator ....................................................................................9-7
9.7 Ordering spare parts and operating supplies ................................................9-8
10 Decommissioning .....................................................................................10-1
11 Removal ..................................................................................................11-1
11.1 Removing the regulator from the pipeline....................................................11-1
11.2 Removing the actuator from the valve .........................................................11-1
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.....................................................................................15-1
15.2 Lubricant..................................................................................................15-1
15.3 Tools........................................................................................................15-1
15.4 Accessories ..............................................................................................15-1
15.5 Spare parts ..............................................................................................15-2
15.6 After-sales service.....................................................................................15-6

EB 3007 EN 1-1
Safety instructions and measures
1 Safety instructions and measures
Intended use
TheSAMSONType42-20andType42-25Regulatorsaredifferentialpressureregulators.
TheyconsistofaType2422ValveandaType2420Actuator(Type42-20)oraType2425
Actuator(Type42-25).Theseregulatorcomponentsaredeliveredseparately.
The self-operated regulators are used to control the differential pressure in plants. Liquids,
gases and vapors in district heating system, extended heating systems or industrial plants
can be controlled by the regulators.
Theregulatorsaredesignedtooperateunderexactlydenedconditions(e.g.operatingpres-
sure, process medium, temperature). Therefore, operators must ensure that the regulators are
onlyusedinoperatingconditionsthatmeetthespecicationsusedforsizingthedevicesat
the ordering stage. In case operators intend to use the regulators in other applications or
conditionsthan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 regulators are 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additionalttingsmountedontheregulator
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 regulator 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.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hazardsduetotheirspe-
cializedtraining,theirknowledgeandexperienceaswellastheirknowledgeoftheapplica-
ble standards.

1-2 EB 3007 EN
Safety instructions and measures
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:
– Protectiveclothing,safetyglovesandeyeprotectioninapplicationswithhot,coldand/or
corrosive media
– Wear hearing protection when working near the valve. Follow the instructions given by
the plant operator.
– Hard hat
– Safety harness when working at height
– Safety footwear, ESD (electrostatic discharge) footwear, if necessary
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.
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regulatorbytheprocessmedium,theoperating
pressure or by moving parts by taking appropriate precautions. Plant operators and operat-
ingpersonnelmustobserveallhazardstatements,warningandcautionnotesinthese
mounting and operating instructions.
Hazardsresultingfromthespecialworkingconditionsattheinstallationsiteoftheregulator
mustbeidentiedinariskassessmentandpreventedthroughthecorrespondingsafetyin-
structions drawn up by the operator.
Wealsorecommendcheckingthehazardsposedbytheprocessmediumbeingused(e.g.
uGESTIS(CLP)hazardoussubstancesdatabase).
ÎObservesafetymeasuresforhandlingthedeviceaswellasrepreventionandexplosion
protection measures.
These mounting and operating instructions deals with the standard version of the device.
Components of the device that differ to those used for the standard version described in this
documentcanbeexchangedwithothercertainSAMSONcomponents.Theresidualhazards
of these components are described in the associated mounting and operating instructions
(see documents listed under 'Referenced documentation').

EB 3007 EN 1-3
Safety instructions and measures
Safety features
TheTypes42-20and42-25Regulatorsdonothaveanyspecialsafetyfeatures.Whenre-
lieved of pressure, the regulators are closed by the force of the set point springs.
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
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 regulators comply with the requirements of the European Pressure Equipment Directive
2014/68/EU.RegulatorswithaCEmarkinghaveanEUdeclarationofconformity,which
includes information about the applied conformity assessment procedure. This EU declaration
ofconformityisincludedinthe'Certicates'section.
AccordingtotheignitionriskassessmentperformedinaccordancewithEN13463-1:2009,
section 5.2, the non-electrical regulators 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 Di-
rective 2014/34/EU.
ÎForconnectiontotheequipotentialbondingsystem,observetherequirementsspeciedin
section6.4ofEN60079-14(VDE0165-1).

1-4 EB 3007 EN
Safety instructions and measures
1.1 Notes on possible severe personal injury
DANGER
!
Risk of bursting in pressure equipment.
Regulators and pipelines are pressure equipment. Impermissible pressure or improper
opening can lead to regulator components bursting.
ÎObserve the maximum permissible pressure for regulator and plant.
ÎIf necessary, a suitable overpressure protection must be installed on site in the plant
section.
ÎBeforestartinganyworkontheregulator,depressurizeallplantsectionsaffected
as well as the regulator.
ÎDrain the process medium from all the plant sections affected as well as the regula-
tor.
ÎWear personal protective equipment.
Referenced documentation
The following documents apply in addition to these mounting and operating instructions:
– Mounting and operating instructions for
e.g. Type2N/NI Strainer uEB1015
– Data sheets for
e.g. Accessories · Differential pressure and ow regulators uT3095
e.g. Type2N/NI Strainer uT1015
– Mountingandoperatinginstructionsaswellasdatasheetsforadditionalttings
(e.g. shut-off valves, pressure gauges etc.).

EB 3007 EN 1-5
Safety instructions and measures
1.2 Notes on possible personal injury
WARNING
!
Risk of personal injury through incorrect operation, use or installation as a result of
information on the regulator being illegible.
Over time, markings, labels and nameplates on the regulator may become covered
withdirtorbecomeillegibleinsomeotherway.Asaresult,hazardsmaygounno-
ticed 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.
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. Follow the instructions giv-
en by the plant operator.
Crush hazard arising from moving parts.
Theregulatorcontainsmovingparts(setpointsprings),whichcaninjurehandsorn-
gers if inserted into the regulator.
ÎDonotinserthandsorngersbetweenthesetpointspringswhiletheregulatoris
in operation.
ÎBeforeperforminganyworkontheregulator,depressurizetheplant.Disconnector
shut off the control line.
Risk of personal injury due to loaded springs.
The set point springs of regulators with adjusted set point are preloaded and are under
tension.
ÎBefore starting any work on the springs, relieve the compression from the preload-
ed springs.

1-6 EB 3007 EN
Safety instructions and measures
WARNING
!
Risk of personal injury due to pressurized components and process medium being
discharged.
Incorrect opening of pressure equipment or mounting parts may lead to the process
medium escaping to the atmosphere.
ÎDonotloosenthecontrollinewhilethevalveispressurized.
ÎDo not start up the regulator until all parts have been mounted.
Risk of burn injuries due to hot or cold components and pipelines.
Depending on the process medium, regulator 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.
Damage to health relating to the REACH regulation.
If a SAMSON device contains a substance which is listed as being a substance of very
high concern on the candidate list of the REACH regulation, this circumstance is indi-
cated on the SAMSON delivery note.
ÎInformation on safe use of the part affected uwww.samsongroup.com/en/
about-samson/material-compliance/reach-regulation/.
Risk of personal injury due to residual process medium in the regulator.
While working on the regulator, residual process medium can escape and, depending
on its properties, may lead to personal injury, e.g. (chemical) burns.
ÎIf possible, drain the process medium from all the plant sections affected and the
regulator.
ÎWear protective clothing, safety gloves and eye protection.

EB 3007 EN 1-7
Safety instructions and measures
1.3 Notes on possible property damage
NOTICE
!
Risk of regulator damage due to incorrectly attached slings.
ÎDo not attach load-bearing slings to the actuator housing (see information under
'Lifting the regulator' in the 'Shipment and on-site transport' section).
Risk of regulator damage due to unsuitable medium properties.
Theregulatorisdesignedforaprocessmediumwithdenedproperties.
ÎOnlyusetheprocessmediumspeciedforsizingthevalve.
Risk of regulator 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 regulator damage due to the use of unsuitable lubricants.
The lubricants to be used depend on the regulator material. Unsuitable lubricants may
corrode and damage surfaces.
ÎOnly use lubricants approved by SAMSON.
When in doubt, consult SAMSON.
Risk of leakage and regulator damage due to excessively high or low tightening
torques.
Observethespeciedtorqueswhentighteningregulatorcomponents.Excessivetight-
ening torques lead to parts wearing out more quickly. Parts that are too loose may
cause leakage.
ÎObservethespeciedtighteningtorques(see'Tighteningtorques'inAnnex).
Risk of regulator damage due to the use of unsuitable tools.
Certain tools are required to work on the regulator.
ÎOnly use tools approved by SAMSON.
When in doubt, consult SAMSON.

1-8 EB 3007 EN
Safety instructions and measures
NOTICE
!
Risk of the process medium being contaminated through the use of unsuitable lubri-
cants and/or contaminated tools and components.
ÎKeep the regulator and the tools used free from solvents and grease.
ÎMake sure that only suitable lubricants are used.
Risk of excess pressure damaging plant sections due to construction-related seat
leakage through the regulator.
ÎAlways install a safety device (e.g. safety excess pressure valve or safety relief
valve) in the plant.
Incorrect control due to the formation of ice on the regulator.
Mediumtemperaturesbelow0°Cmaycauseicetoformontheregulator,depending
on the air humidity. This may affect, in particular, the functioning of the plug or dia-
phragm stem guide.
ÎPrevent the formation of ice by taking appropriate precautions (e.g. enclosure,
trace heater etc.). The plant operator is responsible for selecting and implementing
appropriate precautions. See the 'Installation' section.
SAMSON's After-sales Service can support you concerning lubricant, tightening torques
and tools approved by SAMSON.
Note

EB 3007 EN 2-1
Markings on the device
2 Markings on the device
Severalnameplatesareafxedtothedevice.Thenameplatesareusedtoidentifythesepa-
rateregulatorcomponents(seesection2.1).
2.1 Nameplates
Nameplates of Type2422 Valve
DIN version ANSI version
2314 5
11109876
2314 5
11109876
ANSI version · DIN version
1 Valve type
2 Model number with index
3 Material number
4 Order number or date
5 KVS/CV
6 Unassigned
7Valvesize
8 Pressure rating
9 Perm. differential pressure
10 Perm. temperature
11 Body material
Nameplate of Type2420 and Type2425 Actuators
DIN/ANSI version
1Actuatorarea(DIN/ANSI)
2 Type
3 Material number and device index
4 ID number
5 Year of manufacture
6.1 Pressure rating in Pperm(DIN/ANSI)
7Valvesize(DIN/ANSI)
9Δpsetpointrange(DIN/ANSI)
10 Diaphragm material
11 CE marking
12 Certicationbodynumber
DIN/ANSIversion
6.1
2341 511
7910912
Fig.2-1: Nameplates of regulator components

2-2 EB 3007 EN
Markings on the device
2.2 Location of the nameplates
Location of the
nameplate on the
regulator
components
Fig.2-2: Nameplates of the Type2422 Valve
and the Type2420 and Type2425
Diaphragm Actuators
2.3 Material identication
number
2.3.1 Type 2422 Valve
Seethenameplate(11forDIN/ANSIver-
sion, body material) for the material used.
For more details on the nameplate, see sec-
tion2.1.
2.3.2 Type2420 and
Type2425 Actuators
Specifying the material number, you can
contactustondoutwhichmaterialisused.
Thisisspeciedonthenameplateinthe
'MNo.'eld(3forDIN/ANSI).Formorede-
tailsonthenameplate,seesection2.1.

EB 3007 EN 3-1
Design and principle of operation
3 Design and principle of
operation
ÎSeeFig.3-1andFig.3-2
The differential pressure regulators are de-
signed to maintain the differential pressure
between the high-pressure and low-pressure
linestoadenedsetpoint.
Type42-20·Thesetpointisxed.
Type42-25·Thesetpointcanbeadjusted
as required within the set point range.
The regulators basically consist of the
Type2422Valvewithseat(2)andplug(3)
andaclosingactuator(Type2425orType
2420) with an operating diaphragm (13).
Valve and actuator are delivered separately
and must be assembled on site using a cou-
pling nut (11).
Themediumowsthroughtheareareleased
between the plug (3) and seat (2) in the di-
rection indicated by the arrow. The position
of the valve plug determines the differential
pressure prevailing across the plant.
ThestandardType2422Valveispressure-
balanced. The forces acting on the valve plug
created by the upstream and downstream
pressures are balanced by a balancing
bellows (5) or balancing diaphragm 1) (5.1).
Regulators balanced by a bellows or a
diaphragm only differ in the pressure
balancing principle applied. Valves
balanced by a diaphragm have a balancing
diaphragm (5.1) instead of the balancing
bellows (5). The downstream pressure p2acts
on the bottom of the diaphragm and the
upstream pressure p1on the top of the
diaphragm. As a result, the forces created
by the upstream and downstream pressures
acting on the plug are balanced out.
The differential pressure across the plant is
transmitted over the high pressure and low
pressure lines to the operating diaphragm
(13) where it is converted into a positioning
force. This force moves the plug according to
the force of the set point springs (16).
The set point springs are mounted inside the
actuatorforaxedsetpoint(Type42-20).
The set point springs can be adjusted
externally for an adjustable set point
(Type42-25).Controllines(20)mountedon
site transfer the high pressure and low
pressure in all versions.
The actuator with two diaphragms (special
version) offers increased safety and
reliability of functions. A bore with a
mechanical diaphragm rupture indicator
(34) is located in the intermediate ring
located between the two operating
diaphragms (31 and 32). The pressure of
response of the diaphragm rupture
indicationisapproximately1.5bar/22psi.
In the event of a diaphragm rupture, the
pressure in the space between the two
operating diaphragm starts to increase. This
causes the pin in the diaphragm rupture
indicator to be pushed outwards and a red
ring appears, indicating the rupture. The
intact operating diaphragm takes on the
control task of the ruptured diaphragm.
A pressure switch (accessories) can be op-
tionally mounted to the actuator to trigger an
alarm.
1) Type2422Valve,balancedbyadiaphragm,
DN65to250only

3-2 EB 3007 EN
Design and principle of operation
Type2422 Valve, balanced by a bellows
(DN15to250)
25
+
_
P1P2
1
2
3
4
5
17
11
12
13
15
20
16
18
19
22
14
23
20
24
26
57
Type42-20 with Type2420 Actuator
+
_
16
20
15
23
13
22
14
18
19
20
11
Type42-25 with Type2425 Actuator with two
diaphragms
31
33
32
1
7
Type42-25 with Type2425 Actuator
Fig.3-1: Functional diagram for regulators, DN15 to 250 with balancing bellows

EB 3007 EN 3-3
Design and principle of operation
Type2422 Valve, balanced by a diaphragm
(DN65to250)
+
_
P1P2
2
1
3
4
5.1
Type42-20 with Type2420 Actuator
+
_
16
20
15
23
13
22
14
18
19
20
11
Type42-25 with Type2425 Actuator
with two diaphragms
31
33
32
17
Type42-25 with Type2425 Actuator
Fig.3-2: Functional diagram for regulators, DN65 to 250 with balancing diaphragm
1 Valve body
2 Seat
3 Plug
4 Plug stem
5 Balancing bellows
5.1 Balancing diaphragm
(DN65to250)
11 Coupling nut
12 Diaphragm stem
13 Operating diaphragm
14 Bottom diaphragm case
(valve on top)
15 Nuts and bolts
16 Set point springs
17 Set point adjuster
18 Nut
19 Diaphragm plate
20 Control line
22 Diaphragm stem
23 Top diaphragm case
(valve on top)
24 Outer spring plate
25 Axial needle bearing
with washer
26 Inner spring plate
31 Operating diaphragm
for high pressure
32 Operating diaphragm
for low pressure
33 Diaphragm rupture
indicator
57 Dowel pin
LegendforFig.3-1andFig.3-2

3-4 EB 3007 EN
Design and principle of operation
3.1 Additional ttings
ÎSeeFig.3-3
Pressure gauges
Install a pressure gauge (3 and 5) at suitable
points to monitor the pressures prevailing in
the plant.
Installation in the bypass of a centrifugal pump Installation in the short-circuit pipe of a house substation
42
7
61
35
–+
88
Centrifugal pump
P1
P2
P1P2
42
7
1
6
53
–
+
8
1 Shut-off valve
2 Strainer
3Pressuregauge(owpipe)
4Differential pressure
regulator
5Pressuregauge(returnow
pipe)
6 Shut-off valve
7 Needle valve (optional)
8Compensation chamber
(optional)
Fig.3-3: Installation example: Type42-20 and Type42-25. The control lines to be installed on site
are represented by a dashed line.
Bypass and shut-off valves
We recommend installing a shut-off valve (1
and 6) both upstream of the strainer and
downstream of the regulator and installing a
bypass line. The bypass ensures that the
plant does not need to be shut down for ser-
vice and repair work on the regulator.

EB 3007 EN 3-5
Design and principle of operation
3.2 Technical data
The valve and actuator nameplates provide
information on the valve and actuator ver-
sions (see the 'Markings on the device' sec-
tion).
More information is available in Data Sheet
uT3007.
Conformity
TheType42-20andType42-25Regulators
bear both the CE and EAC marks of confor-
mity.
Process medium and scope of application
The differential pressure regulators are de-
signed to maintain the differential pressure
between the high-pressure and low-pressure
linestoadenedsetpoint.
– Suitable for liquids and vapors,
max. temperature 350°C/660°F1)
– Suitable for gases,
max. temperature 80°C/175°F
– Set points from 0.05 to 10bar
– ValvesizeDN15 to 250
– Pressure ratings from PN16 to 40
Note
Strainers
We recommend installing a SAMSON
strainer (2) upstream of the valve. It prevents
solid particles in the process medium from
damaging the regulator.
ÎDo not use the strainer to permanently
ltertheprocessmedium.
ÎSelectastrainer(meshsize)suitablefor
the process medium.
Any impurities carried along by the process
medium may impair the proper functioning
of the regulator. We recommend installing a
strainer (e.g. SAMSON Type2NI) upstream
of the pressure reducing valve (uEB1015).
Insulation
Regulators can be insulated to reduce heat
energy transfer.
Refer to the instructions in the 'Installation'
section.
The Type42-20 and Type42-25 Regulators
are not safety valves. If necessary, a suitable
overpressure protection must be installed on
site in the plant section.
Note
Note
1) With compensation chamber and extension piece
(optional)

3-6 EB 3007 EN
Design and principle of operation
Table 3-1: Technical data · All pressures in bar (gauge)
Type 42-25 42-20
Valve size DN15 to 250 DN15 to 100
Pressure rating PN16,25,40
Max. permissible tem-
perature
Valve See pressure-temperature diagram in uT3000
Actuator 1) Withcompensationchamber:steamandliquidsupto220°C2)
Withoutcompensationchamber:liquidsupto150°C·Airandgasesupto
80°C
Set point ranges · Differential pressure
across the restriction
0.05to0.25bar·0.1to0.6bar·
0.2to1bar·0.5to1.5bar·1to2.5bar·
2to5bar·4.5to10bar3)
0.2bar,0.3bar,
0.4baror0.5bar
Actuator area A 80cm² 160cm² 320cm² 640cm² 160cm² 320cm²
Max. permissible operating pressure 40barfor80to320cm²·40and16barfor640cm²
Max. perm. operating pressure for
actuator with two diaphragms 40bar 25bar –
Conformity ·
Leakageclassacc.toIEC60534-4 ≤0.05%ofKVScoefcient
1) Max.350°C/660°Fwithextensionpiece
2) Steam version only with valves balanced by a bellows
3) DN125to250:4.5to10baronrequest
TermsforcontrolvalvesizingaccordingtoIEC60534,Parts2-1and2-2: FL= 0.95, XT= 0.75
The regulator is closed when relieved of
pressure. The valve opens when the differen-
tial pressure rises.
Leakage class
The metal-seated regulator has the leakage
classIaccordingtoIEC60534-4.
The soft-seated regulator has the leakage
classIVaccordingtoIEC60534-4.
Temperature range
Dependingonhowtheregulatoriscong-
ured, it can be used up to temperatures of
350°C/660°F(seeTable3-1).Themini-
mum temperature is limited by the accesso-
ries used and the actuator's diaphragm ma-
terial (uT3007).
Noise emissions
SAMSON is unable to make general state-
ments about noise emissions. The noise emis-
sions depend on the regulator version, plant
facilities, process medium and operating
conditions.
Dimensions and weights
Table 3-4 to Table 3-6 provide an overview
of the dimensions and weights. The lengths
and heights in the dimensional drawings are
shownonpages3-13and3-14.