Spirax Sarco 5953 Series User manual

3.562.5275.200
© Copyright 2018
EXPER
TISE SOLUTIONS SUST
AINABILITY
CTLS Issue 3 - 2019
5953 and 5954 Series Self-Operated Valves
Installation and Maintenance Instructions
1. General Safety information
2. General Product information
3. Installation
4. Maintenance
5. Spare parts
6. Faultnding

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Safeoperationoftheunitcanonlybeguaranteedifitisproperlyinstalled,commissionedand
maintainedbyaqualiedperson(seeSection1.11)incompliancewiththeoperatinginstructions.
Generalinstallationandsafetyinstructionsforpipelineandplantconstruction,aswellasthe
properuseoftoolsandsafetyequipmentmustalsobecompliedwith.
1.1 Intended use
ReferringtotheInstallationandMaintenanceInstructions,name-plateandTechnicalInformation
Sheet,checkthattheproductissuitablefortheintendedUse/application.Theproductslistedbelow
complywiththerequirementsoftheEuropeanPressureEquipmentDirective2014/68/EU(PED)
andcarrythemark whensorequired.TheproductsfallwithinthefollowingPressureEquipment
Directivecategories:
Unit Connection Group 1
Gases
Group 2
Gases
Group 1
Liquids
Group 1
Liquids
Actuator
mod. 595/596
Direct - SEP - SEP
Water pot IT - SEP SEP SEP
I) TheproductshavebeenspecicallydesignedforuseonsteamwhichisinGroup2oftheabove
mentionedPressureEquipmentDirective.Theproduct'suseonotheruidsmaybepossible
but,ifthisiscontemplated,SpiraxSarcoshouldbecontactedtoconrmthesuitabilityofthe
productfortheapplicationbeingconsidered.
II) Checkmaterialsuitability,pressureandtemperatureandtheirmaximumandminimumvalues.
Ifthemaximumoperatinglimitsoftheproductarelowerthanthoseofthesysteminwhichitis
beingtted,orifmalfunctionoftheproductcouldresultinadangerousoverpressureorover
temperatureoccurrence,ensureasafetydeviceisincludedinthesystemtopreventsuchover-
limit situations.
III)Determinethecorrectinstallationsituationanddirectionofuidow.
IV)Spirax Sarcoproducts arenot intendedto withstandexternal stressesthat maybeinduced
byanysystemtowhichtheyaretted.Itistheresponsibilityoftheinstallertoconsiderthese
stressesandtakeadequateprecautionstominimizethem.
V) Removeprotectioncoversfromallconnectionsandprotectivelmfromallname-plates,where
appropriate,beforeinstallationonsteamorotherhightemperatureapplications.
1.2 Access
Ensuresafeaccessandifnecessaryasafeworkingplatform(suitablyguarded)beforeattempting
toworkontheproduct.Arrangesuitableliftinggearifrequired.
1.3 Lighting
Ensureadequatelighting,particularlywheredetailedorintricateworkisrequired.
1.4 Hazardous substances in the pipeline
Considerwhatis inthe pipelineorwhat mayhave beeninthe pipelineat someprevious time.
Consider:ammablematerials,substanceshazardoustohealth,extremesoftemperature.
1.5 Hazardous environment around the product
Consider:explosionrisk areas,lack ofoxygen(e.g. tanks,pits), dangerous gases,extremes of
temperature,hotsurfaces,rehazard(e.g.duringwelding),excessivenoise,movingmachinery.
1.6 The system
Considerthee󰀨ectonthecompletesystemoftheworkproposed.Willanyproposedaction(e.g.
closingisolationvalves,electricalisolation)putanyotherpartofthesystemoranypersonnelatrisk?
Dangersmightincludeisolationofventsorprotectivedevicesortherenderingine󰀨ectiveofcontrols
oralarms.Ensureisolationvalvesareturnedonando󰀨inagradualwaytoavoidsystemshocks.
1. General Safety information

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1.7 Pressure systems
Ensurethatanypressureisisolatedandsafelyventedtoatmosphericpressure.Considerdouble
isolation(doubleblockandbleed)andthelockingorlabellingofclosedvalves.Donotassumethat
thesystemhasdepressurisedevenwhenthepressuregaugeindicateszero.
1.8 Temperature
Allowtimefortemperaturetonormaliseafterisolationtoavoidthedangerofburnsandconsider
whetherprotectiveclothing(includingsafetyglasses)isrequired.
1.9 Tools and consumables
Beforestartingworkensurethatyouhavesuitabletoolsand/orconsumablesavailable.Useonly
genuineSpiraxSarcoreplacementparts.
1.10 Protective clothing
Considerwhetheryouand/orothersinthevicinityrequireanyprotectiveclothingtoprotectagainst
thehazardsof,forexample,chemicals,high/lowtemperature,radiation,noise,fallingobjects,and
dangerstoeyesandface.
1.11 Permits to work
All work must be carried out or be supervised by a suitably competent person. Installation and
operatingpersonnelshouldbetrainedinthecorrectuseoftheproductaccordingtotheInstallation
andMaintenanceInstructions.Whereaformal'permittowork'systemisinforceitmustbecomplied
with.Wherethereisnosuchsystem,itisrecommendedthataresponsiblepersonshouldknowwhat
workisgoingonand,wherenecessary,arrangetohaveanassistantwhoseprimaryresponsibility
issafety.Post‘warningnotices’ifnecessary.
1.12 Handling
Manualhandlingoflargeand/orheavyproductsmaypresentariskofinjury.Lifting,pushing,pulling,
carryingorsupportingaloadbybodilyforcecancauseinjuryparticularlytotheback.Youareadvised
toassesstheriskstakingintoaccountthetask,theindividual,theloadandtheworkingenvironment
andusetheappropriatehandlingmethoddependingonthecircumstancesoftheworkbeingdone.
1.13 Residual hazards
Innormalusetheexternalsurfaceoftheproductmaybeveryhot.Ifusedatthemaximumpermitted
operatingconditionsthesurfacetemperatureofsomeproductsmayreachtemperaturesof250°C
(482°F).Manyproductsarenotself-draining.Takeduecarewhendismantlingorremovingtheproduct
fromaninstallation(referto'Maintenanceinstructions').Self-actingvalvesmayoperateunexpectedly
duringnormalservice.Theriskofpersonalinjuryshouldbeassessedforeachinstallation.Where
appropriate,suitableguardingshouldbetted.
1.14 Freezing
Provisionmustbe madetoprotectproducts whicharenotself-drainingagainstfrostdamagein
environmentswheretheymaybeexposedtotemperaturesbelowfreezingpoint.
1.15 Safetyinformation–Productspecic
ThesevalvescontainaPTFEcomponent.WithinitsworkingtemperaturerangePTFEisacompletely
inertmaterial,butwhenheatedtoitssinteringtemperatureitgivesrisetogaseousdecomposition
productsorfumeswhichcanproduceunpleasante󰀨ectsifinhaled.Theinhalationofthesefumes
iseasilypreventedbyapplyinglocalexhaustventilationtoatmosphereasneartotheirsourceas
possible.Smoking shouldbeprohibited inworkshopswherePTFEis handledbecausetobacco
contaminatedwithPTFEwillduringburninggiverisetopolymerfumes.Itisthereforeimportanttoavoid
contaminationofclothing,especiallythepockets,withPTFEandtomaintainareasonablestandardor
personalcleanlinessbywashinghandsandremovinganyPTFEparticleslodgedunderthengernails.
1.16 Disposal
UnlessotherwisestatedintheInstallationandMaintenanceInstructions,thisproductisrecyclable
andnoecologicalhazardisanticipatedwithitsdisposalprovidingduecareistaken.

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Caution
Iftheproductisnotusedinthemannerspeciedbytheseinstructions,theprotection
provided may be impaired.
1.17 Returning products
CustomersandstockistsareremindedthatunderECHealth,SafetyandEnvironmentLaw,when
returningproductstoSpiraxSarcotheymustprovideinformationonanyhazardsandtheprecautions
tobetakenduetocontaminationresiduesormechanicaldamagewhichmaypresentahealth,safety
orenvironmentalrisk.ThisinformationmustbeprovidedinwritingincludingHealthandSafetydata
sheetsrelatingtoanysubstancesidentiedashazardousorpotentiallyhazardous.
1.18 Working safely with cast iron products on steam
Castironproductsarecommonlyfoundonsteamandcondensatesystems.
Ifinstalledcorrectlyusinggoodsteamengineeringpractices,itisperfectlysafe.
However,becauseofitsmechanicalproperties,itislessforgivingcomparedtoothermaterialssuch
asSGironorcarbonsteel.Thefollowingarethegoodengineeringpracticesrequiredtoprevent
waterhammerandensuresafeworkingconditionsonasteamsystem.
Safe Handling
CastIronisabrittlematerial.Iftheproductisdropped
duringinstallationandthereisanyriskofdamage
the product should not be used unless it is fully
inspected and pressure tested by the manufacturer.
Pleaseremovelabelbeforecommissioning.
Prevention of water hammer
Steamtrappingonsteammains:
30÷50m.intervals
Steam
Condasate
Trapset
Gradient1:100
Gradient1:100
Trapset
Condasate
Condasate
Trapset
Steam

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Steam Mains - Do's ( ) and Dont's ( ):
Donotovertighten.
Usecorrecttorquegures.
Flangeboltsshouldbegraduallytightenedacross
diameterstoensureevenloadandalignment.
Prevention of tensile stressing
Pipemisalignment:
Installing products or re-assembling after maintenance:

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Thermal expansion:
Examplesshowingtheuseofexpansionbellows.Itishighlyrecommendedthatexpertadviseis
soughtfromthebellowsmanufacturer.
Guides
Short
distance
Medium
distance
Guides
Fixing
point
Fixing
point
Axialmovement
Limit
rods
Limitrods
Guides
Small
lateral
movement
Small
lateral
movement
Large
lateral
movement
Large
lateral
movement
Axialmovement
Guides

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2. General product information
2.1 Description
Series5953e5954PressureReducingandReliefValvesisarangeofdirectactingself-powered
valveofrobustconstruction,designedtooperateunderarduousconditionsbeingidealtocontrol
thepressureinwater,steam,airandinertgascircuits.
Asoft-seatedPTFEversionisavailable("G"su󰀩x)forair/gasapplicationsthatrequiretightshut-o󰀨
(limitedto200°C).Itisrecommendedthatfortheseapplications,amaximumpressureturndown
ratioof10:1isobserved.
Thevalveiscontrolledbythedownstreampressurewhichactsdirectlyonthediaphragm,opposing
theforcetowhichthespringiscalibrated.Understableconditionsdiaphragmforceandspringforce
areinastateofbalance,butanincreaseordecreaseindemandraisesorlowersthedownstream
pressurewhichinturnactsagainstthespringtocloseoropenthevalvetoadjusttheowrateand
maintainaconstantdownstreampressure.
Series5953and5954Valvesareperiodicmaintenancefree.
Note: Whenoperatingapressurereductiononliquids,itispossiblethatcavitationoccurs.Insuch
situations,itisessentialtousecontrolvalveswhicharespecicallydesignedtoavoiddamagesthat
cavitationmaycausebothtothevalveinternalpartsandtothecomponentsmountedimmediately
downstream.
Fig. 1 - 5953 Reducing Valve Fig.2-5954OverowValve

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2.2 Valve Body - Technical data
ValveBodyTechnicaldetailswithvaluesexpressedinbaraccordingtoANSIstandards,forvalves
inASTMA216Gr.WCBcarbonsteelandinASTMA351Gr.CF8Mstainlesssteel.
2.3 595-596 Actuators - Technical data
Available types 595 Reverse-acting CastSteel DiaphragmDimensions 150/250
596 Direct-acting SG Iron DiaphragmDimensions 150/250
Body design conditions
595-150 595-250
PMA - Maximumdesignpressure 15 bar 4,5bar
TMA -Temperaturamassimaammissibile 110°C *
Minimumdesigntemperature 0°C 0°C
Note: Watersealpotisusedfortemperatures>110°C.
Watersealpotisfilleduptomaximumlevelasshowninthepicture.
Foruseonsteam,itissuggestedtousewaterasthefillingliquid.Forotherworkingfluidsissuggested
tousewaterorglycerine,consistentwiththenatureoftheprocessfluid.
Caution: Thefillfluidshouldhaveadensitygreaterthantheprocessfluid.
Fig. 3 - IT Water seal pot
DN
Waterlling
connection
DN
Actuatorpressure
signal
DNConnection
to the pipeline
DN
MaxLevel
Fillingliquid
2.4 Water seal pot - Technical data

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Technical data
Connections
Version IT
Connection to the pipeline Buttweld 3/8”BW
Connection to the actuator Screwed 1/8”gas
Materials pot housing Carbonsteel
Pressure / temperature limits
IT
Bodydesigncondition PN16
PMA - Maximumallowablepressure @250°C15bar
TMA - Maximumallowabletemperature @15bar250°C
Minimumallowabletemperature 0°C
PMO - Maximumoperatingpressureforsaturatedsteamservice 15 bar
TMO - Maximumoperatingtemperature* 250°C
Minimumoperatingtemperature 0°C
Designedforamaximumcoldhydraulictestpressureof 24 bar
Pressure bar
Temperature°C
IT
0
50
100
150
200
250
0 5 10 15
Steam
saturation
curve
TheITWatersealpotcanbeusedintheentireareaofthechart
Pressure - temperature limits

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Nota: Before actioning any installation observe the 'Safety information' in Section 1.
3.1 General information
Thevalveshouldbeinstalledverticallyinahorizontalpipeline.
Foroperatingtemperaturesbelow110°Cthevalvemaybeinstalledwiththeactuatoreithervertically
upwardsorverticallydownwards(seeFig.4).
Foroperatingonsteamortemperaturesabove110°Cthevalvemustbeinstalledverticallydownwards
withthespring/actuatorbelowthepipeworkwithawatersealpotttedonthedownstreamcontrol
signallinetotheactuator,atypicalinstallationisshowninFig.5.
Fullattentionmustbegiventocorrectlyinstallthevalveasindicatedbytheowdirectionarrowon
thevalvebody.
* minimum of 1 m or 15 times the pipe diameter
**
Fig.4-Typicalinstallationfordownstreamtemperaturesbelow110°C,inwhichthevalvecan
also be installed with the actuator upwards.
**
*minimum of 1 m or 15 times the pipe diameter
ITWatersealpot
Fig. 5 - Typical installation for downstream temperatures higher than 110°C
3. Installation

3.562.5275.200 11
3.2 Pressure control pipe
Thevalveactuatorsignalconnectionmustbepipeddirectlytothedownstreamside.
Toprovideagoodcontrolsignalthedownstreamsensingpointshouldbepositionedaminimumof
1metreor15pipediametersawayfromthevalveorchangeinpipeworkdirectiononeitherside.
Itisrecommendedthattheactuatorsignalpipeshouldbe8mmdiametercopperorstainlesssteel
of1mminimumlength.
3.3 Preventing dirt
Beforeinstallingthevalvethesystempipeworkshouldbeushedouttoremoveanyresidualdirtor
scalethatmaybepresent.Thevalveshouldbeprotectedbyapipelinestrainerofthesamesizeas
theupstreampipework.Forsteamandairapplicationsthestrainershouldbeinstalledonitsside
topreventtheaccumulationofwater.
3.4 Removal of condensate
Forsteaminstallationsaseparatorshouldbeinstalledontheupstreamsideofthevalvettedwith
a suitable steam trap.
3.5 Pressure gauges
Toassistincommissioningthevalveandmonitoringoperatingconditionsitisessentialtotpressure
gaugesonbothupstreamanddownstreamsidesofthevalve.
3.6 Safety valve
Itisrecommendedthatasuitablesafetyvalveisinstalledonthedownstreamsideofthevalveto
protectdownstreamequipmentfromexcessivepressure.
Thevalveshouldbesettoliftatapressurebelowthesafeworkingpressureofthedownstream
equipmentandsizedtopassthefullcapacity,shoulditfailinthefullyopenposition.Thesafetyvalve
outletpipeworkshoulddischargetoaprotectandsafeplace.
3.7 Isolating valves
Itisrecommendedthatmanuallyoperatedisolatingvalvesareinstalledupstreamanddownstream
ofthepressurereducingvalvestationtoprovidemeansofisolationforcleaningandmaintenance.
3.8 Water seal pot
Iftted,thewatersealpotmustbechargedwithwaterpriortothevalvebeingputintoservice.Remove
thewatersealpotllingplugandfullychargethevesselwithsoftwater.Replacethellingplug.
Tocommissionthevalve,slowlyopentheupstreammanualisolatingvalvetoavoidwaterhammer.
Thepressurereducingvalveisnowreadyforoperation.
3.9 Setting the desired downstream pressure
Thevalveissupplied'non-calibrated'withthespringadjusteratitslowestadjustmentposition.The
requireddownstreampressuremaybesetagainsteitheradeadendconditionorowingcondition,
dependingontherequirementsoftheapplication,takingintoaccountthee󰀨ectofproportionalo󰀨set.
Thedesireddownstreampressureisobtainedbyrotatingthespringadjusterwhilstmonitoringthe
downstreampressuregauge.
Adjustmentcanbemadeusinga32mmstandardopenendedspanner.
Compressingthecontrolspringdownstreamsetpressureisincreased,whilerelaxingthespring
tensionreducesthedownstreamsetpressure.

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4. Maintenance
Nota:Beforeactioninganymaintenanceprogramobservethe'Safetyinformation',Section1.
Productspecic-SafetyInformation
Thisproductshouldnotbedismantledwithoutrstreleasingthecompressiononthecontrolspring.
4.1 General information
The valve is maintenance free, but it is recommended that the valve is dismantled every 12 to
18monthsforroutineinspectionofthecomponentparts.Itemsshowingsignsofwearshouldbe
replaced.DetailsofavailablesparesaregiveninSection5.Priortoroutineinspectionorttingspare
components,rstlyensurethereducingvalveisisolatedandthattheupstreamanddownstream
pressuresarereducedtozero,rotatingspringadjuster(9)toreducespring(s)compressiontozero.
Thedownstreampressuresignalpipeshouldbedisconnectedfromtheactuator.
Note: This product contains PTFE/steel composite brushes. The precautions laid down in
Section1.15shouldbetaken.
Numbers in brackets refer to the parts number as shown on the valve section drawings in the
terminal part.
4.2 Routine maintenance
After an initial period in operation it is recommended that the tightness of the nuts(29)whichx
thebonnet(32)andthebottomange(38)tothevalvebodyandwhichcouldhavelooseneddue
tothetemperaturevariations,mechanicalvibrationsorstress,bechecked.
Thisimportantoperationwillavoidleakageofuidthroughthebodygaskets,whichwouldbedi󰀩cult
to eliminate later.
Questaoperazioneèmoltoimportanteondeevitareperditedelleguarnizionidelcorpo,perditeche,
accentuandosi,di󰀩cilmentepotrebberoessereeliminateconuntardivoserraggiodeidadi.
Thestu󰀩ng-boxmustbecheckedfrequently.Duringthersthoursofoperating,toeliminate
possible leakage, screw-in the stu󰀩ng box nut (23) slightly (¼ revolution only for teon/
graphiteorgraphitestu󰀩ngbox),uidpressureitselfwillassuretightnessofthepacking.
Donottightenthestu󰀩ngboxnutexcessivelyasthiscanthencausevalvelocking.Toreduce
stemfriction,itissuggestedthatthestem(22)belubricatedwithaspecialsiliconeoilatleast
oncepermonthorwhenitbecomesdry.
4.2.1 Trouble shooting (failures and possible causes)
Forsuccessfulperformanceofthevalve,thestem(22)ofthevalvemustmovefreelyaccordingtothe
airpressurechangesonthediaphragm.Ifthisactionisnotobtained,checkthefollowing:
Stu󰀩ngbox
Checkthatthestu󰀩ngboxpacking(27)isnotover-tightenedsoastopreventfreemovementof
thevalvestem(avoidhighfriction).
Diaphragm
Incaseofdiaphragmdamage,thevalvewillnolongerperformacompletestroke.Ifthediaphragm
isnolongerexibleorisdamaged,replaceitimmediately(seeparagraph4).
Plug guides
Checktheguidesoftheplug.Ifnecessary,cleanorgrindthem.
Leakageofuidthroughthevalveintheclosedposition.
Incaseofinsu󰀩cienttightness:itwillbenecessarytobearinmindthelimitsofmaximumleakage
ofuidallowedwiththevalveintheclosedpositionforthedi󰀨erenttypesofvalveconstructionwith
metaltometalseatingorwithgasketsoftseating.
Such limits are indicated in the valve technical specication of the di󰀨erent executions. Check
thatbetweenplugandseatnoforeignmaterialexistsandthatthecontactareaisnotexcessively
damaged,ifnecessarycarefullygrindthembyusingnegrindingcompoundmixedwithmachineoil.
Forextensivedamage,replacementofseatandplugbecomesnecessary(fordisassemblingthe
valve,seeparagraph5).

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4.3 How to renew the actuator diaphragm and the sealing washer (Fig. 6)
- Beforereplacingspareparts,separatetheactuatorfromthevalve
- Rotatethespringadjuster(9)tofullydischargethespring(12).
- Removeboltsandnuts(15,16),thecover(20)andthediaphragm(19)fromtheactuator.
- Fitthenewdiaphragm(19).
- Replacethecover(20)oftheactuator.
- Replace boltsandnuts(15,16).
- Fixtheactuatorassemblytothevalvebytighteningtheactuatormountingring
- Reconnectthelineofthepulseinlet.
- Beforeoperatingthevalve,watersealpotshouldbelledwithwater(wheninstalled).
- Re-commissionthevalve.
Fig. 6 - Actuator Mod. 595

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4.3.1 How to renew or change the control spring(s) (Fig. 6)
- Rotatethespringadjuster(9)tofullydischargethecompressionofthespring(12).
- Disconnectthedownstreampressuresignalpiping.
- Undotheactuatormountingnutsandseparatetheactuatorfromthevalve.
- Removeboltsandnuts(c),thecover(d)andthediaphragm(e)fromtheactuator.
- Undothelockingscrew(g)andremovethediaphragmplate(f).
- Replacethespringandreassembleinreverseordertheplate,andthelockingscrew.
- Reassemblethediaphragm,cover,screwsandnuts.
- Adjustthestrokeofthevalveandreconnecttheinletpulsepiping.
- Re-commissionthevalve.

3.562.5275.200 15
Parts List
Note:Whenplacinganorderforsparepartspleaseclearlyspecifythefullproductdescriptionas
foundonthelabelofthevalvebody,asthiswillensurethatthecorrectsparepartsaresupplied.
Part. N. Description
1Upperdiaphragmcasing
2Diaphragmplate
3Diaphragmcasingboltsandnuts
*4 Diaphragm
5Diaphragmrod
6Lowerdiaphragmcasing
7Springadjustingringnut
9Springadjustingscrew
10 ActuatorCounterspring
11 Hexagonsocketcapscrew(except592type)
12 Yoke
14 Travelindicatorplate
15 Fixingortravelstopbolts
19 Stemhexagonlocknut
20 Traveldischexagonlocknut(forIndustrialvalvesonly
21 Travelindicatordisc(forindustrialvalvesseriesonly)
22 Stem
23 Stu󰀩ngboxnut
24 YokeNutlock
*27 Stu󰀩ngboxpackingassembly
29 Body nuts
30 Lantern(exceptseries25andcastironvalves)
31 Plugxingpin(wheretted)
32 Bonnet
33 ValvePlug
*34 Bodygaskets
35 Valvebody
36 Seatring/s
37 Guidebushing(wheretted)
38 Blindbottomange
39 Body studs
42 Lowerpluglocknuts
61 Self-adjustingspring
70 Washers
*Recommendedspareparts
5. Spare parts

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¼"NPTairconnection
Fig. 7 - Model 592 diaphragm pneumatic actuator reverse acting
Fig. 8 - Model 595 diaphragm pneumatic actuator size 250 for self-regulating valves
NPTairconnection½"NPT(pressurecontrolpipe)

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Fig. 9 - Model 3 double seated valve body direct acting
Fig. 10 - Model 4 double seated valve body reverse acting

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Fig.11-Stu󰀩ngboxassemblywithteon/graphiterings
Fig.12-Stu󰀩ngboxassemblywithgraphiterings

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6.Faultnding
Before investigating any fault ensure that both upstream and downstream isolating valves
are shut.
Symptom Possible cause Remedy
Downstream pressure
increases above it’s 'set'
pressure.
1. Blockageofthepressure
signalpipeorcoupling.
1. Disconnectthepressure
signalpipefromtheactuator
couplingandblowthrough
thepipeandcouplingto
clear obstruction.
2. Leakageacrossactuator
diaphragmoractuator
diaphragmclampgasket.
2. Removetheactuator
housingandinspectthe
diaphragmanddiaphragm
clampwasher,replacingas
necessary.
3. Damageorerosionto
valvehead/seat.
3. Removethebonnet/spring
/actuatorassemblyand
inspectthevalveheadand
seatfordamageorwearand
replace as necessary.
Underfullloadcondition,
downstream (Mod. 5953)
pressure drop is lower
of the required pressure
control.
Underfullloadcondition,
upstream (Mod. 5954)
pressure drop is higher
of the required pressure
control.
Thevalveisachieving
maximumlift,butis
undersizedfortheduty
required.
Checkmaximuminstalledload
conditionrequiredandvalvesize
selected and installed.
Valve is correctly sized but
is not supplying full load.
Thevalveisnotachievingfull
liftpositionatmaximumload.
Checkfullliftsettingas
described in Section 4.3.
Onlowowconditions,
downstream pressure is
hunting.
1. Oversensitivepressure
controlsignal.
1. Remove8mmpressure
signalpipeandactuator/
watersealpotcouplingsand
replacewith6mmsignal
pipeandcouplings.
2. Highpressureturndown
ratios.
2. Considertwovalvesin
seriestoreduceturndown
ratios.
3. Downstreampressure
tappingistoocloseto
valve.
3. Ensurethedownstream
pressuresignaltappingis
notlocatedwithinaturbulent
areaandisatleast1m(40")
fromanyvalveortting.
Unable to adjust
downstream set pressure
Theactuatorisnotbeing
subjectedtodownstream
pressure.
Removethesignalpipefrom
theactuatorandcheckfor
sludgebuild-upandblockage

3.562.5275.200 CTLS Issue 3 - 2019.02
Spirax-Sarco S.r.l. - Via per Cinisello, 18 - 20834 Nova Milanese (MB) - Tel.: [phone] - Fax: [phone]
SERVICE
Fortechnicalsupport,pleasecontactourlocalSalesEngineerorourHeadO󰀩cedirectly:
Spirax Sarco S.r.l.-TechnicalAssistance
ViaperCinisello,18-20834NovaMilanese(MB)-Italy
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E-mail:[email protected]
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