Mounting and Operating Instructions

EB 2640 EN Edition January 2016

Type 2371-11 Pressure Reducing ValveManual set point adjustment

Type 2371-10 Pressure Reducing ValvePneumatic set point adjustment

Series 2371 Pressure Regulators

Pressure reducing valves for the food and pharmaceutical industriesType 2371-10 · Pneumatic set point adjustmentType 2371-11 · Manual set point adjustment

Definition 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 se-rious injury

NOTICEProperty damage message or mal-function

Note:Additional information

Tip:Recommended action

2 EB 2640 EN

Contents

EB 2640 EN 3

1 General safety instructions .............................................................................42 Process medium and scope of application .......................................................52.1 Transportation and storage .............................................................................53 Design and principle of operation ..................................................................64 Installation ..................................................................................................104.1 Mounting position ........................................................................................104.2 Shut-off valve and pressure gauge .................................................................104.3 Safety valve .................................................................................................114.4 Leakage line connection ...............................................................................115 Operation ...................................................................................................115.1 Start-up .......................................................................................................115.2 Adjusting the set point ..................................................................................115.2.1 Setpoint · Type 2371-11 ..............................................................................125.2.2 Setpoint · Type 2371-10 ..............................................................................145.3 Operation ...................................................................................................145.4 Decommissioning .........................................................................................146 Cleaning and maintenance ..........................................................................156.1 Cleaning .....................................................................................................156.2 Maintenance · Replacingparts ......................................................................196.3 Replacingtheplug .......................................................................................196.4 Replacingthediaphragmunit .......................................................................216.5 Replacingthetwodiaphragms ......................................................................226.5.1 Replacingthesetpointsprings ......................................................................247 Customer service .........................................................................................248 Nameplate ..................................................................................................259 Technical data .............................................................................................2610 Dimensions .................................................................................................27

4 EB 2640 EN

General safety instructions

1 General safety instructions − The regulator is to be mounted, started up or serviced by fully trained and qualifiedpersonnelonly;theacceptedindustrycodesandpracticesaretobe observed. Make sure employees or third persons are not exposed to any danger.

− Allsafetyinstructionsandwarningsgiveninthesemountingandoperatinginstructions, particularly those concerning installation, start-up and mainte-nance, must be strictly observed.

− According to these mounting and operating instructions, trained personnel referstoindividualswhoareabletojudgetheworktheyareassignedtoand recognize possible dangers due to their specialized training, their knowledgeandexperienceaswellastheirknowledgeoftheapplicablestandards.

− Toensureappropriateuse,onlyusetheregulatorinapplicationswheretheoperatingpressureandtemperaturesdonotexceedthespecificationsusedfor sizing the regulator 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 regulator by the process medium, operating pressure or by moving parts are to be prevented by taking appro-priate 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 ignition source according to the ignition risk assessment stipu-lated in EN 13463-1: 2009, section 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 in section 6.3 of EN 60079-14: 2014-10 (VDE 0165 Part 1).

EB 2640 EN 5

Process medium and scope of application

2 Process medium and scope of applicationPressure regulators for food processing and pharmaceutical industries for liquids and gases inthetemperaturerangefrom0to160 °C(32to320 °F) · KVS 0.1to16(CV 0.12to20) NominalsizeDN 15to50(NPS ½to2).Forcontrollingtheoutputpressurep2totheadjustedsetpoint.Thevalvecloseswhenthedownstreampressurerises.

WARNING!The Type 2371-10/-11 Regulators are designed as safety valves. Exceeding the max-imum pressure (10 bar/150 psi) of the regulator may cause it to burst.If necessary, a suitable overpressure protection must be installed on site in the plant section.

Note:The Type 2371-10/-11 Regulators are shut-off devices that do not guarantee abso-lute tight shut-off (leakage class according to DIN EN 60534-4 or ANSI/FCI 70-2, see section 9 on page 26). As a result, the output pressure p2 can rise to the same level as the upstream pressure p1 in a plant which does not have its own consump-tion.

2.1 Transportation and storageThe regulators must be carefully handled, transported and stored. During storage and trans-portationbeforeinstallation:Protecttheregulatorsagainstadverseinfluences,suchasdirt,moisture or temperatures outside the operating temperature range.

6 EB 2640 EN

Design and principle of operation

3 Design and principle of oper-ation

TheType2371-10andType 2371-11Re-ducing Pressure Valves consist mainly of a single-seatedanglevalvewithoperatingdia-phragm and actuator housing.ThesetpointoftheType 2371-10isadjust-ed pneumatically by an external air supply, e.g. compressed air.ThesetpointofType 2371-11isadjustedmanually by tensioning the set point spring.Themediumflowsthroughthevalvebody(1)inthedirectionindicatedbythearrow.Thepositionoftheplug(3)determinestheflowrateacrosstheareareleasedbetweenplugandvalveseat(2).Thevalvecloseswhenthedownstreampressurep2 rises above the ad-justed set point. The resulting output pressure p2dependsontheflowrate.Any medium escaping from the test connec-tion(11)indicatesthattheoperatingdia-phragm(4)maybeleakingorthedia-phragm has ruptured. The test connection of Type 2371-10isconnectedtoaflexiblepipeelbowtodischargeanymediumescaping.

Type 2371-11 · Version with manual set point adjustment (seealsosection 5.2onpage 11)In the idle state, the valve is kept open by the setpointsprings(7).Thevalvecloseswhenthe output pressure p2 acting on the dia-phragm(4)andtheresultingforceexceedthe force of the springs.The set point is adjusted by an Allen key (8 mm),whichisinsertedthroughtheadjust-

mentopening(6.1)ontopofthehousingontothesetpointscrew(6).Theblankingplugmustfirstberemoved.Ifnecessary,thesetpointscrewcanbesecuredbythelock-ingscrew(12)intheupperplugsectiontopreventthesetpointscrewfromlooseningdue to vibrations, causing the set point to change.Thedisk(15)servesasabottomendstoptoprotect the diaphragm from overload and to prevent parts from falling apart inadvertently whiletheregulatorisbeingdismantled.Turningthesetpointscrewclockwisecausesthespringplate(7.1)tomoveupwardsandincreases the spring force and the set point. Turningthesetpointscrewcounterclockwiserelieves the spring tension and reduces the set point.

Type 2371-10 ·Version with pneumatic set point adjustment (seealsosection 5.2onpage 11)In the idle state, the valve is kept open by the set point pressure pc(compressedair)ap-plied as the control pressure.When the force created by the output pres-sure p2 acting on the diaphragm exceeds the force resulting from the set point pressure pc, theplug(3)movestowardstheseat(2),clos-ing the passage. In this case, the ratio be-tweenp1 and pc is not necessarily 1:1.As the output pressure p2 drops, the resulting force reduces again. The valve is opened againwhenthepressurefallsbelowthesetpoint pressure pc.

EB 2640 EN 7

Design and principle of operation

Thetwodiaphragms(4.1)provideacertainamountofsafetywhenoneofthedia-phragms ruptures and prevents the process medium and external pressure medium from

mixing.Thescrew(12)preventspartsfromfallingapartinadvertentlywhiletheregula-tor is being dismantled.

Fig. 1: Functional drawings of the regulators

p1

p2

pc

15

3

112

4.1

12

6.1

6

8

1

9

5

3

2

12

7.1

7

11

4

15

p1

p2

1 Valve body 6 Setpointscrew 11 Test connection or leakage line connection

2 Seat 6.1 Adjustmentopeningwithblankingplug 12 Lockingscrew3 Plug 7 Set point springs 15 Mechanicalstop(disk)4 Operating

diaphragm7.1 Spring plate p1 Input pressure

4.1 Twodiaphragms 8 Actuator housing p2 Output pressure5 Upper plug section 9 Clampfitting pC Setpointpressure(control

pressure),external

6

12

Type 2371-10 Type 2371-11

Type 2371-11 · Lockingscrewtolockthesetpointscrewinposition

8 EB 2640 EN

Design and principle of operation

Stem locking for CIP or SIPSeesection6.1onpage 15.Type 2371-10andType 2371-11canbefit-tedwithastemlockingtokeeptheplugintheopenposition.Thisallowstheregulatortobecleaned(CIPorSIP)whilethevalveisopen.The stem can be locked in place pneumati-callybyanadditionalpneumaticunitwithcompressedairconnection(forTypes 2371-10and2371-11)ormanuallyusingaspe-cialpin(forType 2371-11only).The pneumatic and manual stem locking do not effect the control function of the valve, provided the stem locking is not engaged.The pneumatic unit for the pneumatic stem locking is located on the top of the regulator. The unit can be mounted in any position

sincetheaxialfixtureoftheunitallowsittoturn360°.The pin of the manual stem locking is screwedintotheadjustmentopeninginplace of the blanking plug.

Pneumatic stem locking · Types 2371-10/-11 Manual stem locking · Type 2371-11Stem locking engaged

Fig. 2: Stem locking

ê pV ∙ G 1/8 connection

Pneumatic unit

Pin

Lock nut

EB 2640 EN 9

Design and principle of operation

Pneumatic stem lockingType 2371-10To open the valve, apply a pressure pV (= 1 bar)tothepneumaticunit.Thiscausestheplugstemtomovetogetherwiththeplugout of the valve seat. A set point pressure pC must not be applied to the regulator in this case.Toswitchthevalvebacktoitscontrolfunc-tion, remove the pressure pV(=1 bar).Type 2371-11To open the valve, apply a pressure pV (= 6 bar)tothepneumaticunit.Thiscausestheplugstemtomovetogetherwiththeplugout of the valve seat, opposing the spring force.Toswitchthevalvebacktoitscontrolfunc-tion, remove the pressure pV(=6 bar).

Manual stem lockingType 2371-11 onlyTolockthestemintoplace,screwthepinintothe opening on top of the actuator housing in place of the blanking plug. The end of the pin comes to rest on the head of the set point screw.Asthepinisscrewedintothevalve,itpushes the plug into the open position over thesetpointscrewandupperplugsection.A mechanical stop prevents it from being screwedinanyfurther,protectingthedia-phragm from overstretching or rupturing. Se-cure the position using the lock nut.When the groove of the pin is completely concealed,thestemlockingisactive,where-as a visible groove means it is disengaged.

10 EB 2640 EN

Installation

4 Installation

NOTICEPay particular attention to correct hy-giene and ensure that regulators for the food and pharmaceutical indus-tries are kept absolutely clean.Used tools must be free of sol-vents and grease. Only use a lubri-cant suitable for foodstuffs (order no. 8150-9002) for parts that must be lubricated.

Chooseaplaceofinstallationthatallowsyou to freely access the regulator even after the entire plant has been completed and al-lowsunobstructedsetpointadjustment.Before installing the regulator in the pipeline, clean the pipeline thoroughly to remove any foreignparticlesintheplantwhichcouldaf-fect the regulator's proper functioning.The plant must be designed and the pipe-linesinstalledinsuchawaythattheregula-torcanbemountedandoperatedwithoutany tension. If necessary, support the pipe-line near to the connections. Do not attach supports to the regulator itself.Selectastraightsectionofpipelinewithoutany disturbances as the site of installation for theregulator(toensurethatthecontrolfunc-tionisnotaffectedbytheflowconditions).

4.1 Mounting positionThe regulator has an angle-style valve body. The actuator hous-ingmustfaceupwards.Asare-sult, the outlet must face to the side in the installed position. − Directionofflowmustmatchthedirec-tionindicatedbythearrowonthebody(inletatthebottomandoutletattheside).

4.2 Shut-off valve and pressure gauge

Install a manually operated shut-off valve up-streamanddownstreamoftheregulator.Thisallowstheplanttobedepressurized,ifre-quired. In addition, it serves to relieve the operatingdiaphragmofpressurewhentheplant is not operated for extended periods.Apressuregaugedownstreamoftheregula-torallowsthesetpoint(tocontroltheoutputpressure p2)tobemonitored.

13

1

2

p1

p2

Fig. 3: Installation drawing (Type 2371-11)

1 Shut-off valve2 Pressure gauge3 Safety valve

p1 Input pressurep2 Output pressure

Type 2371-11

EB 2640 EN 11

Operation

4.3 Safety valveTheTypes 2371-10/-11Regulatorsareshut-off devices that do not guarantee absolute tightshut-off(leakageclass,seesection 9onpage 26).As a result, the output pressure p2 can rise to thesamelevelasthedownstreampressurep1inaplantwhichdoesnothaveitsownconsumption.

WARNING!The pressure in the entire system must not exceed the maximum permissi-ble pressure. Corresponding safety equipment (e.g. safety valve) must be installed downstream of the regula-tor. Ensure that the pressure reducing valve itself cannot exceed the spec-ified maximum pressure of 10 bar (150 psi).

The permissible temperature and pressure limitsarespecifiedontheregulator.

4.4 Leakage line connectionA leakage line can be connected to the regu-latorwhentoxicordangerousmediaareused. In the event of a defective diaphragm (e.g.diaphragmrupture),anyprocessmedi-um that escapes can be fed through a pipe to a safe location.Adapt the pipe diameter to the connection at the regulator.

5 Operation

5.1 Start-upFirststartuptheregulatoraftermountingallparts.Filltheplantslowlywiththeprocessmedium.Avoid pressure surges. Open the shut-off valvesfirstontheupstreampressureside.Afterwards,openallthevalvesonthecon-sumerside(downstreamoftheregulator).

Tip:For optimal control, the required pressure set point must be within the top end of the setting range.

5.2 Adjusting the set pointThe set point must be adjusted on starting up the plant running under normal operating conditions.Thepressuregaugelocatedonthedown-stream(output)pressuresideallowsthead-justed set point to be monitored. − ThesetpointadjustmentinType 2371-

10 is pneumatic1). − ThesetpointofType 2371-11isadjust-

ed manually by tensioning the set point spring.

___1) Externalsupplyair(e.g.compressedair,

pmax = 8 bar)required

12 EB 2640 EN

Operation

5.2.1 Set point · Type 2371-11Manualsetpointadjustment ∙SeeFig. 1onpage 7.Thesetpointisadjustedforthelowestoutputpressure in the delivered state. The locking screw(12)isnot tightened.

NOTICESet point screw screwed too tight!The regulator is blocked and the me-dium flow through it is restricted. Pressure regulation is no longer pos-sible.Only screw the set point screw up to the point where the spring tension can still be felt.

How to proceed:1. Removethestopper.UseanAllenkey

(3 mm)toundothelockingscrew(12)ifitistightened(twoturnscounterclock-wise).

2. UseanAllenkey(8 mm)toremovetheblankingplug(6.1).

3. Place the key through the opening to reachthesetpointscrew(6).

4. Turnthesetpointscrew(totensionthesetpointspring)toadjustthesetpoint:

− Turnclockwise: Increases the pressure setpoint(theoutputpressurerises).

− Turncounterclockwise:Reducesthepressuresetpoint(theoutputpressuredrops).

Monitorthedownstreampressureatapres-suregauge(seeFig. 3onpage 10).

Thevalvecloseswhentheoutputpressurep2 exceeds the adjusted set point.5. Retightenthelockingscrew(12)topre-

ventthesetpointscrew(6)frombeingturned.

− Reinsertthestopper.

EB 2640 EN 13

Operation

1.

Positionofthelockingscrew(12)withstopper

Fig. 4: Set point adjustment of Type 2371-11

3.

4.

Stopper ∙ Lockingscrew(12)concealed

6.1

6

2.

5.

14 EB 2640 EN

Operation

5.2.2 Set point · Type 2371-10Pneumaticsetpointadjustment ∙ SeeFig. 1onpage 7.

How to proceed:1. Connect the external set point pressure

lineattheG ¼connection.Max.pres-sure pc = 8 bar.

2. Adjust the set point pressure pc to obtain and keep the required pressure constant.

Monitorthedownstreampressureatapres-suregauge(seeFig. 3onpage 10).Thevalvecloseswhentheoutputpressurep2 exceeds the adjusted set point.

Fig. 5: Pneumatic set point adjustment

G ¼connectionforthesetpointpressureline at the side on the pneumatic unit

5.3 OperationAcorrectlysizedType 2371-10/-11Pres-sureReducingValveworksautomaticallywithinitscontrolrange.We recommend after every start-up to check that the regulator functions properly and to adaptittonewoperatingconditions,ifnec-essary.

5.4 DecommissioningClose the shut-off valve upstream of the valve andthenclosetheshut-offvalvedownstreamof the valve.

Note:Before performing any work on the regulator, make sure the relevant plant section has been depressurized and, depending on the process medi-um, drained as well.

EB 2640 EN 15

Cleaning and maintenance

6 Cleaning and maintenanceThe pressure reducing valves do not require any maintenance. Nevertheless, they are subjecttonaturalwear,particularlyattheseat, plug and operating diaphragm.Depending on the operating conditions, check the regulator at regular intervals to avoid possible malfunctions.

WARNING!Be aware of the risk on performing work on pressurized or hot plant sec-tions.Hot process medium can escape un-controlled on dismantling the regula-tor. Risk of scalding!Allow the regulator to cool down be-fore depressurizing and draining it and remove it from the pipeline.

Checktheseatandplugforwear.CheckthatthePTFElayerofthediaphragm(seeFig. 1,Fig. 12,andFig. 13)isnotdamaged(e.g.cracks,milkycoloringatthebends).ThisisnecessaryforcompliancewithEU1935/2004.If leakage still occurs and there is no visible signs of damage on the diaphragm, check theconnectionbetweentheplugsupportandplug stem or the clamped connection be-tweenthevalvebodyandbonnet(seesec-tion 6.2onpage 19).Tighten the connection to achieve a leak-proof joint.

6.1 CleaningTo clean inside the regulator, the plug can be keptintheopenpositionintheversionwithstemlockingtoallowthevalvetobecleaned(CIP=CleaningInPlaceorSIP=Steriliza-tionInPlace)whileitisopen(seeStemlock-ingforCIPorSIPonpage 8).Stem locking:PneumaticforType 2371-10/-11·ManualforType 2371-11The disengaged stem locking does not affect the regulator's control function.

16 EB 2640 EN

Cleaning and maintenance

Manual stem locking

Type 2371-11See Stem locking for CIP or SIP on page 8.

How to proceed:1. Removetheblankingplugandscrewthe

pin(13)ofthestemlockingwiththelocknut(14)intotheadjustmentopening.

− The end of the pin comes to rest on the headofthesetpointscrewandkeepstheplug in the open position. A mechanical stoppreventsitfrombeingscrewedinany further, protecting the diaphragm from being overloaded.

2. Usethelocknut(14)tokeepthisposi-tion.

− When the groove of the pin is completely concealed, the stem locking is active.

− A visible groove means it is disengaged. − The control function of the valve is not af-fectedwhenthestemlockingisdisen-gaged.

14

13

6

8

7

Manualstemlocking · Type 2371-11

6 Setpointscrew7 Set point springs8 ActuatorhousingofType 2371-1113 Pin14 Lock nut

Fig. 6: Manual stem locking

EB 2640 EN 17

Cleaning and maintenance

Pneumatic stem locking

Type 2371-10 and Type 2371-11

See Stem locking for CIP or SIP on page 8.

Type 2371-11The pressure pV = 6 bar applied to the pneu-matic unit opens the valve. This causes the plugstemtomovetogetherwiththeplugoutof the valve seat and opens the valve.

How to proceed:1. Connectthepressurehosewithmin.

6 mmdiametertotheG 1/8 connection.2. Apply a pressure pv=6 bartothepneu-

maticunit.Thiscausesthesetpointscrew(6)tomoveandtheplugtomoveoutofthe valve seat and opens the valve.

3. Toswitchthevalvebacktoitscontrolfunction, remove the pressure pV=6 barto return the pressure back to atmospher-ic pressure.

4. Thespring(16)pullstheactuatingunitback,allowingtheplugstemtomoveagain for the control task.

Pneumaticstemlocking · Type 2371-11

6 Setpointscrew7 Set point springs8 ActuatorhousingofType 2371-1116 Spring17 Actuatingunit/diaphragm

pV Pressure for stem locking

Fig. 7: Pneumatic stem locking

pV

1716

86

7

Stem locking engaged pV = 6 bar

Actuator housing Stem locking

G 1/8 connection

18 EB 2640 EN

Cleaning and maintenance

Type 2371-10To open the valve, apply a pressure pV=1 bartothepneumaticunit.Thiscausestheplugstemtomovetogetherwiththeplugoutof the valve seat. A set point pressure pC must not be applied to the regulator in this case.

How to proceed:1. Connectthepressurehosewithmin.

6 mmdiametertotheG 1/8 connection.2. Applyapressurepv=1bartothepneu-

matic stem locking. This causes the actu-atingunit(17)tomovetheplugstemto-getherwiththeplugoutofthevalveseatand open the valve.

3. Toswitchthevalvebacktoitscontrolfunction, remove the pressure pV(=1 bar)toreturnthepressurebacktoat-mospheric pressure.

4. Thespring(16)pullstheactuatingunitback,allowingtheplugstemtomoveagain for the control task.

Pneumaticstemlocking · Type 2371-10

8 ActuatorhousingofType 2371-1015 Upperplugsectionwithmechanicalstop16 Spring17 Actuatingunit/diaphragm

pV Pressure for stem locking

Fig. 8: Pneumatic stem locking

pV

17

1615

8

G 1/8 connection

Stem locking disengaged pV = Atmosphericpressure

Actuator housing Stem locking

EB 2640 EN 19

Cleaning and maintenance

6.2 Maintenance · Replacing parts

SeeFig. 1onpage 7.Theregulatorissubjecttonaturalwear.De-pending on the operating conditions and du-ration of operation, regularly check the regu-lator's ability to function.Incasethedownstreampressurerises,forexample,whenalltheconsumersareclosed,and the valve does not shut off tightly enough.Thismayhappenwhenthetightshut-off is impaired by either dirt or natural wearontheseatandplug.However,itisim-portant to take into account that a maximum leakageof0.05 %oftheKVS or CVcoeffi-cient in the case of metal-seated plugs and 0.01 %inthecaseofsoft-seatedplugsisstillpermissible(refertosection 9onpage 26).

6.3 Replacing the plugTypes 2371-10/-11 · Replacing the plugTheplug(3)isscrewedintotheplugsupport(3.1)andcanonlyberemovedthroughtheinletport.Usetheappropriatesocketwrenchtounscrewtheplug.

How to proceed:1. Loosentheplugusingthesocketwrench − DN15to25(NPS ½to1):width across

flats 10 DN32to50(NPS 1¼to2):width across flats 13

2. Unscrewtheplug(3)throughtheinletport p1.Removethetwowashersandtheseal.

3. Priortoinstallinganewplug:Checktheseat and seat facing, so far as it is possi-ble, for damage. In case of damage, the regulator must be replaced or repaired.

Cutawaymodel·Unscrewingorscrewingintheplugwithasocketwrench

Screwed-inplug(3),plugsupport(3.1)sealandwashers

Fig. 9: Replacing the plug of Type 2371-11

33.1

3

3.1

Input p1

Socketwrench

20 EB 2640 EN

Cleaning and maintenance

We recommend also checking the dia-phragm for cracks and damage as a preven-tivemeasure.Refertosection 6.4onpage 21.Assemblethenewplug(3)inthereverseor-der described for the disassembly. Insert the twowashersintothethreadedholewiththeconcavesidesfacingawayfromeachother(asshowninthedrawing). − Do not forget the PEEK seal!

Tightening torque − DN 15to25:5 Nm(NPS ½to1)

− DN 32to50:20 Nm(NPS 1¼to2) Insertwashersasshowninthediagram.

Type 2371-11 ∙ Insertingthewashers

Fig. 10: Soft-seated plug with plug support

PEEKseal

O-ring

V-portplugwithEPDMsoftseal

Washers

EB 2640 EN 21

Cleaning and maintenance

6.4 Replacing the diaphragm unit

Type 2371-11 · Diaphragm unitIn the event that the diaphragm is defective, werecommendreplacingtheentiredia-phragm unit, consisting of the diaphragm (4),plugstem(3.2)insideofitandplugsup-port(3.1).

Type 2371-11 ∙ Housingwithclampfitting

Type 2371-11 ∙ Diaphragm unit removed

Fig. 11: Replacing the diaphragm unit

12

8

9

3.2

5

4

15

Contact SAMSON if you intend to replace just the diaphragm or plug support.

How to proceed (see Fig. 11):1. Removetheplug(seesection 6.3on

page 19).

Note:The valve and housing are loaded by the compressed springs. The valve is opened by spring force. Relieve the set point springs of tension before re-moving the actuator housing.

2. Removethestopper.Undothelockingscrew(12).Turnthesetpointscrew(6)counterclockwisetorelievethetensionfrom the set point springs. As a result, the housing is not loaded by the spring tensionanymore(refertosection 5.2onpage 11).

3. Releaseclampfitting(9).Liftofftheactu-atorhousing(8)togetherwiththespringassembly(7)andsetpointscrew(6).

4. Removetheguideflange(5)togetherwithplugstem(3.2)insideofitaswellasthemechanicalstop(15),plugsup-port(3.1)anddiaphragm(4).

5. Unscrewthelockingscrew(12).Undobothscrewsofthemechanicalstopplate(15).Liftoffplate.

22 EB 2640 EN

Cleaning and maintenance

Note:The plug stem is guided by ball bear-ings in the guide flange. On pulling off the guide flange, the ball bear-ings embedded in food grade lubri-cant are exposed and might fall out.

6. Carefullypulltheguideflange(5)off.Take the ball bearings out of the guiding grooves and keep them at hand for the followingassembly.

7. Replacethediaphragmunitwithanewone.

8. Reassemblethepartsinthereverseor-der. Carefully place the actuator housing onto the valve body. Make sure that the threadedboreatthesideisalignedwiththelockingscrewandthatthedia-phragm rests neatly in place.

9. Positiontheclampfitting.Greasethegrooveandscrewwithfoodgradelubri-cant.Hittheclamplightlywithaplastichammerandtightentheclampscrewagainuntilthepartsfitproperly.

Type 2371-11 · Replacing the diaphragm unit together with the flange sectionThe diaphragm is replaced as a complete unittogetherwiththeguideflange(5),plugstem(3.2)insideofitaswellastheplugsupport(3.1).Itmaybenecessarytoreplacethediaphragmassemblywhentoomuchclearancearisesbetweentheguideflangeand plug stem after a long service life.

How to proceed:Seesection 6.4onpage 21.

Type 2371-11 ∙ Guideflange(5),insideplugstem(3.2),diaphragm(4)andplugsupport(3.1) ∙ Theplugmustbeunscrewedforremoval.

Fig. 12: Replacing the diaphragm unit together with the flange section

6.5 Replacing the two dia-phragms

Type 2371-10 · Two diaphragmsThetwodiaphragmsareclampedfromtheoutsidebetweenthevalvebody(1)andcov-er(1.1).Insidetheplugsupportandplugstem that are bolted together guide the dia-phragms. The internal and external spacing rings(20)arelocatedbetweenthetwodia-phragms.Toreplacethediaphragms,firstpullthecov-er(valvebonnet)offthevalvebody(bottom

5

3.2

4

3.1

EB 2640 EN 23

Cleaning and maintenance

section)togetaccesstotheplugstem(19)anddiaphragms(4.1).

How to proceed1. Undoandremovethefourscrews(16,

widthacrossflats 13).Keepinasafeplace for later.

2. UseanAllenkey(6 mm)tounthreadthestopper(15.2).Unscrewthestopscrew(15).Makesurethattheinsertedwasher(15.1)doesnotgetlost.Keepinasafeplace for later.

3. Thegrubscrewwithtrunnion(12.1)actsas a locking pin and prevents the cover (1.1)andplugstem(19)frombeingpulledoffseparately.Turnthegrubscrewtothepointwhereitisstillheldinplaceby the thread.

Note:The plug stem is guided by ball bear-ings in the cover (valve bonnet). On pulling off the cover, the ball bear-ings embedded in food grade lubri-cant are exposed and might fall out.

4. Carefully pull off the cover.5. Undothegrubscrew(12.1).Dismantle

theplugstem(19)andplugsupport(18)that are bolted together.

6. Removethediaphragms(21)alongwiththe internal and external spacing rings (20).

7. After replacing the diaphragms: Assem-ble in the reverse order. Tighten the four screws(16)withatighteningtorqueof30 Nm.

1515.1

15.2

211.1

1

4.1

12.11916

2018

Fig. 13: Replacing the two diaphragms in Type 2173-10

1 Valve body1.1 Cover4.1 Twodiaphragms12.1 Grubscrewwithtrunnion15 Mechanicalstop(screw)15.1 Retainingwasher15.2 Stopper16 Screws(4pcs./widthacrossflats

SW 13)18 Plug support19 Plug stem20 Spacing rings21 Ball bearings

24 EB 2640 EN

Customer service

6.5.1 Replacing the set point springs

Type 2371-11 · Set point springsYouneedtoreplacethesetpointsprings(7)withbothplatestoachieveadifferentsetpoint range. We recommend changing the entireactuatorhousing(8)withsetpointsprings(7)andsetpointscrew(6).

How to proceed:The regulator does not need to be removed from the pipeline.Seesection6.4onpage 21,steps2and3.

Type 2371-11 ∙ Actuatorhousingwithinternalsetpoint springs

Fig. 14: Exchanging the set point springs

7

8

6

7 Customer serviceIf malfunctions or defects occur, contact the SAMSON After-sales Service Department for support.Please e-mail inquires to:aftersalesservice@samson.deThe addresses of SAMSON AG, its subsid-iaries, representatives and service facilities worldwidecanbefoundontheSAMSONwebsite(u www.samson.de),inallSAMSON product catalogs or on the back of these Mounting and Operating Instruc-tions.To assist diagnosis and in case of an unclear mountingsituation,specifythefollowingde-tails(seesection 8onpage 25): − Typedesignationandmodificationindex − Nominal size DN − Serial number − Temperature and process medium − Is a strainer installed? − Installationdrawingshowingtheexact

location of the regulator and all the ad-ditionallyinstalledcomponents(shut-offvalves,pressuregauge,etc.)

EB 2640 EN 25

Nameplate

8 NameplateThespecificationsarelocatedontheregula-tor housing.

Fig. 15: Inscription field 1 on the housing

Comments:1 Type designation2 Modificationindex3 Nominal size DN4 Material numbers according to DIN EN5 Maximumpressureinbarat20 °C

Maximumpressureinpsiat70 °F6 Maximumoperatingtemperaturein°Cor°F7 FlowcoefficientKVS(m³/h)

or CV(USgal/min)ME = MetalsealEPDM=Softseal(EPDM)PK=SoftsealwithPEEK

8 Serial number

7

3

5

6

8

2

4

1

PEDart. 3sect. 3

MadeinFrance

Fig. 16: Inscription field 2 on the housing

Comments:9 Markofconformity(food)10 PED labeling11 MadeinFrance/yearofmanufacture12 Arrowindicatingthedirectionofflow

Note:Each regulator can be clearly iden-tified by the specifications written on the nameplate. Therefore, do not cov-er or write over the specifications on the nameplate.

1012

11

9

26 EB 2640 EN

Technical data

9 Technical data

Table 1: Technical data · All pressures (gauge)Type 2371-10/-11 DINNominal size DN 15 DN 20 DN 25 DN 32 DN 40 DN 50

Set point rangesType 2371-10

KVS 10 –1.5to6 bar

KVS 16 3.5to6 bar

Type 2371-11 0.3to1.2 bar ∙ 1to3 bar ∙ 2.5to4.5 bar ∙ 4to6 bar

Maximum pressure 10 bar

Max. perm. temperatures

Operating temperature range 0to160 °C

Sterilizing temperature 180 °Cforupto30minutes

Leakage class according to IEC 60534

Metal seal Class I(≤0.05 %ofKVScoefficient)

Soft seal Class IV(≤0.01 %ofKVScoefficient)

Peak-to-valley height and surfacefinish

External Glassbeadblasted 1) ∙ Ra≤0.6 μm,polished

Internal Ra≤0.8 μm,precision-lathed 1) ∙ Ra≤0.6 μm,polished Ra≤0.4 μm,satinfinish ∙ Ra≤0.4 μm,mirrorfinish

Compliance

Type 2371-10/-11 ANSI

Nominal size NPS ½ NPS ¾ NPS 1 NPS 1¼ NPS 1½ NPS 2

Set point rangesType 2371-10

CV 12–

22to90 psi

CV 20 52to90 psi

Type 2371-11 5to18 psi ∙ 15to45 psi ∙ 35to65 psi ∙ 60to90 psi

Maximum pressure 150 psi

Max. perm. temperatures

Operating temperature range 32to320 °F

Sterilizing temperature 356 °Fforupto30minutes

Leakage class according to ANSI/FCI 70-2

Metal seal Class I(≤0.05 %ofCVcoefficient)

Soft seal Class IV(≤0.01 %ofCVcoefficient)

Peak-to-valley height and surfacefinish

External Glassbeadblasted 1) ∙ Ra≤0.6 μm,polished

Internal Ra≤0.8 μm,precision-lathed 1) ∙ Ra≤0.6 μm,polished Ra≤0.4 μm,satinfinish ∙ Ra≤0.4 μm,mirrorfinish

Compliance

1) Standard version

EB 2640 EN 27

Dimensions

10 Dimensions

L1

H1

L2A

7 mm

H3

L1

H1

52 mm

L2A

H3

Type 2371-11 ∙ Standardversion Type 2371-11 ∙ Withmanualstemlocking

L2A

ØD H3

H

10.5 mm

H1

L1

RefertotablesstartingwithTable 2onpage 29forassociateddimensions.

Type 2371-11withclampendconnectionsinthesedrawingsTheclampfitting(connectionbetweentheactuatorhous-ingandvalve)isturned90°inthedrawing.

Type 2371-11 ∙ Withpneumaticstemlocking

Fig. 17: Dimensional drawings for Type 2371-11

28 EB 2640 EN

Dimensions

L2A

H3

41.3 mm

H1

L1

L2A

H3

H1

H

10.5 mm

L1

ØD

Type 2371-10 ∙ Standardversion Type 2371-10 ∙ Withpneumaticstemlocking

Øint Øext

L1 (L2)L1 (L2)

ØextØint

Clamp connections Flanges

ThreadedconnectionaccordingtoDIN ... ThreadedconnectionaccordingtoISO/SMS ...

Fig. 18: Dimensional drawings · Type 2371-10 and various types of end connections for Types 2371-10/-11

Øint Øext

L1 (L2)

Øint Øext

L1 (L2)

EB 2640 EN 29

Dimensions

Table 2: Dimensions of the regulatorsType 2371-11 Type 2371-10

Nominal sizeDN 15NPS ½

DN 20NPS ¾

DN 25NPS 1

DN 32NPS 1¼

DN 40NPS 1½

DN 50NPS 2

DN 32NPS 1¼

DN 40NPS 1½

DN 50NPS 2

Com-mon dimen-sions

A 85 mm 145 mm

H 80 mm

H1 245 mm 260 mm 180 mm

H3 ≥200 mm

ØD 150 mm

Weight, approx. 1)

Type2371-10/-11 8.5 kg 11 kg 15 kg

Stem lockingPneumatic unit 2.5 kg

Pin 0.1 kg1) Withweldingends

30 EB 2640 EN

Dimensions

Table 3: Threaded connections · All dimensions in mmType 2371-11 Type 2371-10

Nominal size DN 15 NPS ½

DN 20 NPS ¾

DN 25 NPS 1

DN 32 NPS 1¼

DN 40 NPS 1½

DN 50 NPS 2

DN 32 NPS 1¼

DN 40 NPS 1½

DN 50 NPS 2

DIN11864-1 GSForm A Series A

pmax 10 bar/150 psiL1 55 55 60 60 65 70 105 105 105L2 90 90 90 90 90 90 155 155 155Øint 16 20 26 32 38 50 32 38 50Øext RD34x1/8“ RD44x1/6“ RD52x1/6“ RD58x1/6“ RD65x1/6“ RD78x1/6“ RD58x1/6“ RD65x1/6“ RD78x1/6“

DIN11864-1 GSForm A Series B

pmax 10 bar/150 psiL1 55 55 60 60 65 70 105 105 105L2 90 90 90 90 90 90 155 155 155Øint 18.1 23.7 29.7 38.4 44.3 56.3 38.4 44.3 56.3Øext RD44x1/8“ RD52x1/6“ RD58x1/6“ RD65x1/6“ RD78x1/6“ RD95x1/6“ RD65x1/6“ RD78x1/6“ RD95x1/6“

DIN11864-1 GSForm A Series C

pmax 10 bar/150 psiL1 – 55 60 – 65 70 – 105 105L2 – 90 90 – 90 90 – 155 155Øint – 15.75 22.1 – 34.8 47.5 – 34.8 47.5Øext – RD34x1/8“ RD52x1/6“ – RD65x1/6“ RD78x1/6“ – RD65x1/6“ RD78x1/6“

DIN11887 A Series 1

pmax 10 bar/150 psiL1 55 55 60 60 65 70 105 105 105L2 90 90 90 90 90 90 155 155 155Øint 16 20 26 32 38 50 32 38 50Øext RD34x1/8“ RD44x1/6“ RD52x1/6“ RD58x1/6“ RD65x1/6“ RD78x1/6“ RD58x1/6“ RD65x1/6“ RD78x1/6“

ISO 2853 =IDF

pmax 10 bar/150 psiL1 – – 60 60 65 70 105 105 105L2 – – 90 90 90 90 155 155 155Øint – – 22.6 31.3 35.6 48.6 31.3 35.6 48.6Øext – – 37x1/8“ 45.9x1/8“ 50.6x1/8“ 64.1x1/8“ 45.9x1/8“ 50.6x1/8“ 64.1x1/8“

SMS 1146

pmax 10 bar/150 psiL1 – – 60 60 65 70 105 105 105L2 – – 90 90 90 90 155 155 155Øint – – 22.6 29.6 35.6 48.6 29.6 35.6 48.6Øext – – RD40x1/6“ RD48x1/6“ RD60x1/6“ RD70x1/6“ RD48x1/6“ RD60x1/6“ RD70x1/6“

EB 2640 EN 31

Dimensions

Table 4: Clamp connections · All dimensions in mmType 2371-11 Type 2371-10

Nominal size DN 15 NPS ½

DN 20 NPS ¾

DN 25 NPS 1

DN 32 NPS 1¼

DN 40 NPS 1½

DN 50 NPS 2

DN 32 NPS 1¼

DN 40 NPS 1½

DN 50 NPS 2

DIN 11864-3 NKSFormA Series A

pmax 10 bar/150 psiL1 55 55 60 60 65 70 105 105 105L2 90 90 90 90 90 90 155 155 155Øint 16 20 26 32 38 50 32 38 50Øext 34 50.5 50.5 50.5 64 77.5 50.5 64 77.5

DIN 11864-3 NKSFormA Series B

pmax 10 bar/150 psiL1 55 55 60 60 65 70 105 105 105L2 90 90 90 90 90 90 155 155 155Øint 18.1 23.7 29.7 38.4 44.3 56.3 38.4 44.3 56.3Øext 34 50.5 50.5 64 64 91 64 64 91

DIN 11864-3 NKSFormA Series C

pmax 10 bar/150 psiL1 – 55 60 – 65 70 – 105 105L2 – 90 90 – 90 90 – 155 155Øint – 15.75 22.1 – 34.8 47.5 – 34.8 47.5Øext – 34 50.5 – 64 77.5 – 64 77.5

DIN32676,Series A

pmax 10 bar/150 psiL1 55 55 60 60 65 70 105 105 105L2 90 90 90 90 90 90 155 155 155Øint 16 20 26 32 38 50 32 38 50Øext 34 34 50.5 50.5 50.5 64 50.5 50.5 64

DIN 32676 Series B

pmax 10 bar/150 psiL1 55 55 60 60 65 70 105 105 105L2 90 90 90 90 90 90 155 155 155Øint 18.1 23.7 29.7 38.4 44.3 56.3 38.4 44.3 56.3Øext 50.5 50.5 50.5 64 64 77.5 64 64 77.5

DIN32676 Series C

pmax 10 bar/150 psiL1 – 55 60 – 65 70 – 105 105L2 – 90 90 – 90 90 – 155 155Øint – 15.75 22.1 – 34.8 47.5 – 34.8 47.5Øext – 25 50.5 – 50.5 64 – 50.5 64

ISO 2852

pmax 10 bar/150 psiL1 – – 60 60 65 70 105 105 105L2 – – 90 90 90 90 155 155 155Øint – – 22.6 31.3 35.6 48.6 31.3 35.6 48.6Øext – – 50.5 50.5 50.5 64 50.5 50.5 64

BS 4825 Part 3 =ASMEBPE

pmax 10 bar/150 psiL1 – 55 1) 60 – 65 70 – 105 105L2 – 90 1) 90 – 90 90 – 155 155Øint – 15.75 1) 22.2 – 34.9 47.6 – 34.9 47.6Øext – 25 1) 50.5 – 50.5 64 – 50.5 64

1) Version according to ASME BPE only

32 EB 2640 EN

Dimensions

Table 5: Flanges · All dimensions in mmType 2371-11 Type 2371-10

Nominal size DN 15 NPS ½

DN 20 NPS ¾

DN 25 NPS 1

DN 32 NPS 1¼

DN 40 NPS 1½

DN 50 NPS 2

DN 32 NPS 1¼

DN 40 NPS 1½

DN 50 NPS 2

DIN11864-2NFFormA,Series A

pmax 10 bar/150 psiL1 90 95 100 105 115 125 105 105 105L2 90 95 100 105 115 125 155 155 155Øint 16 20 26 32 38 50 32 38 50Øext 59 64 70 76 82 94 76 82 94

DIN11864-2NFFormA,Series B

pmax 10 bar/150 psiL1 90 95 100 105 115 125 105 105 105L2 90 95 100 105 115 125 155 155 155Øint 18.1 23.7 29.7 38.4 44.3 56.3 38.4 44.3 56.3Øext 62 69 74 82 88 103 82 88 103

DIN11864-2NFFormA,Series C

pmax 10 bar/150 psiL1 – 95 100 – 115 125 – 105 105L2 – 95 100 – 115 125 – 155 155Øint – 15.75 22.1 – 34.8 47.5 – 34.8 47.5Øext – 59 66 – 79 92 – 79 92

DIN EN 1092-1 B2 or ASME B16.5 Cl 150

On request

EB 2640 EN 33

34 EB 2640 EN

EB 2640 EN 35

SAMSON AG · MESS- UND REGELTECHNIKWeismüllerstraße 3 · 60314 Frankfurt am Main, GermanyPhone: +49 69 4009-0 · Fax: +49 69 4009-1507samson@samson.de · www.samson.de EB 2640 EN 20

16-03-11·English