DTP CHOKE VALVEDiscrete Tortuous Path

Solution FOR SEVERE CHOKE APPLICATIONS

VALVE AND CONTROL SYSTEM

DTP CHOKE ADVANTAGES:• Improvedplantperformance

• Reducedleakagecosts

• Higherreliability

• Lowernoise

• Longerintervalsbetweenmaintenance

• Reducemaintenance&downtime,

meaningnointerruptiontoproduction

• Reducedsystemcosts

• Lowerinstallationcosts

• 24hoursupport&worldwidelocations

DTP DISCRETE TORTUOUS PATH CHOKE VALVES are designed to provide the highest level of quality

and reliability for flow control applications under

severe conditions, preventing the Cavitation and other

risksrelatedtothehighfluidvelocityaltogether.

ABV Energy has the capability to deliver complete

valves for the major and most demandingOil &Gas

andPetrochemicalprojectsthroughouttheworld.

Valves for severe service conditions are generally

subjectedtoveryhighdifferentialpressuresand/orvery

lowtemperatures,therebyextremecaremustbetaken

in order to avoid costly premature failures. Problems

associatedwiththeseconditionsareflowerosionofthe

valvebodyandtrim,vibrationandhighnoise.

Forthesereasons,ourmission is toprovideengineered

products that safely operate and deliver long

term performance, having a low maintenance cost

with a long life of the main internal components.

3Dmodelingandcomputationalfluiddynamicssimulations

have been analyzed and studied by ABV Energy to

assure valve performances throughout its entire life.

Solution FOR SEVERE CHOKE APPLICATIONS

MAIN APPLICATIONSInOil&GasandPetrochemicalproduction,transmission

andprocessing, includingLNGservice,with focuson

theircommonproblems.

OIL & GAS WELLHEAD CONTROL

• Continuouslyoperatedoverthelifeofthefield

• Wellheadfluidspressuredroprangefrom

700Bar(10,000psig)atstartupto1Bar(15psig)

yearslater

• HighsandContent

• Highnoiselevel

• HighVibration

• Presenceofmulti-phasefluids

WATER INJECTION

• HighPressureDrop

• Highcavitationpotential,especiallyatthestart-up

• Highrangeability,oftenrequired

GAS INJECTION

• HighPressureDrop

• HighVibration

• Highrangeability,oftenrequired

SEPARATOR LEVEL CONTROL

• Sandyservice

• Highcavitationpotential

• Dissolvedgassesmayflash

• Corrosiveenvironment

DTPChokeValvearesuitable for several types of

fluids and aggressive environmentslike:

• CorrosiveandSour(H2S),(materialinaccordance

withNACEMR01-75)

• AbrasiveandOxygenService,

• Slurriesandsolidsuspensioningasesandair,

• Vapour(includingsteam),whethercleanordirty,

• Multi-phaseFluids.

INTERNATIONAL STANDARDSValvesaresized,designed,manufacturedandtestedinaccordancewith:API 6A HighPressure,UpStreamValvesASME VIII Division 1&2 RulesofConstructionASME II MaterialsSpecificationsASME B16.05 FlangeStandardsASME B16.10 FacetoFacedimensionsLongPattern(customizedonrequest)ASME B16.25 ButtweldingEndsASME B16.34 Designrulesforflanges,threaded,andweldedendISA 75.05 CvTerminologyISA 75.01 FlowequationforsizingcontrolValvesISA 75.11 InherentFlowCharacteristicsVDMA 24422 NoisePredictionLevelANSI/FCI 70-2 ControlValveSeatLeakageISA 75.02 ControlValveCapacityTestProceduresIEC 60534 ControlValvesSTD

DESIGN PHILOSOPHY

ThedesignprincipleofDTP®istocontroltheflowvelocitybycontrollingthepressurelossesacrossthevalve.A

singlehighpressuredrop,acrossthevalve,producesanunsteadysystemwithoutanypossibilitytocontrolthe

outputflowvelocity,whereasdividingitinseveralstages,areductionofthevelocityispossible,therebyreducing

theriskofprematurefailuresrelatedoncavitationanderosion.

DTP®Valvesaretraditionalrobustanglevalves(globetypeavailableonrequest)withamultistagecageand

itscorrespondingplug,specificallydesignedtoprovideahighenergydissipation.

Trend of pressure through a 6 Turn Path Trend of velocity through a 6 Turn Path

Flow

WHERE:V= requiredvelocitySG= specificgravityVH=pV

2/2velocityheadN= numberofturn

2×SG×VHN

V=

Flow

MultiStageCageconsistsofaclampedstackofdiskshavingamultiple

setoftortuouspathsinparalleltoeachother,usedtoincreasetheflow

resistancethroughthetrim.Thisdecreasestheoverallvelocitythroughthe

valve,therebyreducingthepressurerecovery.

Typically,discretetortuouspathusesaseriesofright90°angleturnsto

createfrictionallossesandtoslowdownvelocity.

Eachturnreducesthevelocitybyonevelocityhead,therebythevelocity

insidethetrimcanbecalculatedasfollowing:

INHERENT FLOW CHARACTERISTIC• LINEAR: Allthedisksinthestackhavethesamenumberofpassagesandturns,andthesameflowarea;theflowisdirectlyproportionaltothevalvestrokeatacertaindifferentialpressure.

• MODIFIED EQUAL-PERCENTAGE : Disks can be different. The number of the passages, the turns and flowarea are varied according to precise calculation in order to satisfy the following rule. A change in

flowper unit of valve stroke is directlyproportional to the flowoccurring just before the change ismade.

Thereductionofthevelocityisthepredominantfactortoavoidtheriskoferosion.

Erosionratewillvaryasa third tofifthpowerfunctionof thevelocity.Discrete

TortuousPathdesignprotectsthetrimfromprematureerosion,increasingthetrim

lifemanytimes.

ABVEnergyprovidestrimswithtwodifferentDiscreteTortuousPathtypologies:

• ETCHED OR LASER DISCRETE TORTUOUS PATH foranhorizontaldirectionflow.

• THROUGH DISCRETE TORTUOUS PATHforaverticalandhorizontalflowdirectionwith

disksmadefromathroughspaceplate.

Forcompressiblefluids inadditiontothevelocitycontrol throughtherighthand

turn,thetortuouspathwayscanbeenlarged,allowingtheexpansionoftheflow.

VELOCITY REQUIREMENTSInletfluidsvelocityandinternaltrimvelocityhavetobelimitedtominimizethevalvebodyerosionandtoavoid

thepotentialriskofinstabilityandvibrationofthesystem.

IncaseofLiquidService,theDPTmultistageconfigurationassuresanoutputflowvelocityequaltotheinletflow

velocity.

IncaseofGasService,theflowvelocitythroughtheDTPmultistagecagemustbelimiteddependingonthe

requestedacceptableSoundpressurelevel(SPL).

• SPL<85dBA Velocitythroughthetrimmustbelessthan0.3xMach

• 85dBA<SPL<95dBA Velocitythroughthetrimmustbelessthan0.5xMach

Sound Pressure Level (SPL) is estimated in accordance with VDMA 24422, thanks to our dedicated sizing

program.FormoreinformationabouttheSPLandourprogram,pleaseasktoourSalesDepartment.

Etched tortuous path

Through tortuous path

NoteOn request, wide availability of materials depending on the customer specifications.

ITEM COMPONENT

1 Body

2 Bonnet

3 DTP Multi Stage Cage

4 Seat Ring

5 Plug

6 Stem

7 Gasket

8 Seal

9 Bolting

1

2

6

9

7

8

5

3

4

SIZE 1”-12”

PRESSURE CLASS ASME150-4500 API3000-15000

TEMPERATURE RANGE -60°Cto200°C

QUALITY TEST LEVEL PSL1;PLS2;PSL3 andPSL3Gonrequest

STANDARD LEAKAGE CLASS FCI-70,2ClassIV,V othersonrequest

VALVE CHARACTERISTIC LinearModified Equal-Percentage

ACTUATOR PneumaticSpringreturn/ DoubleActing

HydraulicSpringreturn/ DoubleActing Electric

PneumaticStepper

MAIN DESIGN FEATURES• Standardforgedbodyconstructioninaccordance

withAPI6A,ASMEB16.34.

• BoltedBonnetwithmetaltometalforenhanced

safetyandeasymaintenance.

• Bodygallerysizedforoptimizingtheflowcapacity

insidethebody.

• Stackofthedisksisclampedwithoutanyinternal

threadsandcanbeinstalledwithoutanyspecial

tools.

• Plugandtrimareinterchangeableinstandard

valvedesign.

• Plugandtrimmaterialwithexcellenterosion

resistanceproperty.

• Trimwithlargeflowinletports,toeasilyallowto

thesolidanddirtyparticlestoflowthrough.

• Balancedpressureplugtominimizetheactuator

thrust.

• Blowoutproofstemdesign.

• LipSealsforalldynamicandstaticsealstoenhance

reliabilityofvalve.

• Globetypebodyavailableonrequest

NoteFor valve size over than 12”, please ask directly to our Sale DepartmentFor Special applications the Cv value will change in order to satisfy the operating requirements.

VALVE SIZE

TRIM SIZE

CVSTANDARD

1”

2”

3”

4”

6”

8”

10”

12”

1/2”

1”

1”1.1/2”

1”1.1/2”2.1/21.1/2”2.1/2”

3”2.1/2”

3”4”3”4”5”

5”6”

5

18

18 40

18 40

10540

105150105150 265150265415

415600

Solution FOR SEVERE CHOKE APPLICATIONS

VALVE AND CONTROL SYSTEM

ABV ENERGY S.p.A.Via di Coselli, 13/15 - 55060 Coselli, Capannori - Lucca - Italy

Tel. +39.0583.403587 - Fax +39.0583.949920 - www.abvenergy.com - info@abvvalves.com - sales@abvvalves.com

Apply advanced design technologyto improve performance.