供水管网中阀门问题的研讨（discussion on valve problem in water supply network） 21页

'供水管网中阀门问题的研讨（Discussiononvalveprobleminwatersupplynetwork）DiscussiononvalveprobleminwatersupplynetworkIntroduction:Aimingatthevalveprobleminwatersupplynetwork,throughtheinvestigationandfieldinvestigation,somespecificproblemsarediscussed,andrelevantsuggestionsareputforward.Thevalveisakindof"theidea,forthemoment"ofthecontrolequipment,usuallyrequiredtoplacethevalveopentoreducelossofwaterpipe.Oncerequired,thevalveshouldbeabletoshutdownquicklyandflowreliably.Valveintactrate,relatedtotheselectionofthevalve,valvemanufacturing,pipelinedesign,valveassembly,valveopeningandclosingoperationsandvalvemanagement,ofcourse,themainreasonisthequalityofthevalve.Keywords:ValveNetworkvalve1.ThefunctionofthevalveinthewatersupplynetworkintheThewatersupplynetworkwilltransferthewaterfromthewaterworkstothousandsofhouseholds,sothewatersupplynetworkisdistributedineverycornerofthecity,andthepipelengthofthewatersupplynetworkislessthanhundredsofkilometers,morethanthousandsofkilometers.Theimportanceofsafeoperationofwatersupplynetworkisdecidedbytheirreplaceablenatureofwaterandthenecessityofpeople"sexistence.However,duetovarioussubjectiveandobjectivereasons,thepipelineoftenhassomefaults,the pipelinenetworkisalwaysupdated,thewaterusersoftenhavetoincreaseordecrease,sothelocalpipesectionofthephenomenonofwatersupplyisdifficulttoavoid.Inordertoreducethescopeofthewatersupply,itisverynecessarytoinstallthecontrolvalveproperlyinthepipenetwork.Therefore,inacity"swatersupplynetwork,thenumberofvalvestensofthousands,andirregularlydistributedinthecitystreetsbelow.Thevalveisakindof"theidea,forthemoment"ofthecontrolequipment,usuallyrequiredtoplacethevalveopentoreducelossofwaterpipe.Oncerequired,thevalveshouldbeabletoshutdownquicklyandflowreliably.Valveintactrate,relatedtotheselectionofthevalve,valvemanufacturing,pipelinedesign,valveassembly,valveopeningandclosingoperationsandvalvemanagement,ofcourse,themainreasonisthequalityofthevalve.Ontheproblemof2.Throughtheinvestigationoftheuseofpipenetworkvalvesin20watercompanies,throughtheinvestigationoftenvalvemanufacturers,itisunderstoodthatthevalveplaysabigroleinthewatersupplynetwork,alargenumber,widedistribution,andmanyproblems.Valveoperationinwatersupplynetworkisnotfrequent,long-termstandby,oncesummoned,itisdifficulttowork.Therefore,inthevalveselection,valvemanufacturing,valveinspection,valveassembly,valvemanagement,therearemanythingsworthdiscussing. 2.1valvetypeselection(1)gatevalveandbutterflyvalveInthewatersupplypipenetworktoreducepipelineoverburdendepth,largediameterpipesgenerallymatchingbutterfly,overburdendepth,andseekmatchingvalve,causingthelinetobeoverindiameteraccordingtospecificcircumstances.Fromtheuseofthepasttenyears,thevalvefailureishigherthanthegatevalve,soundertheconditionspermit,expandthescopeofthegatevalveisworthyofattention.(2)gatevalveInrecentyears,manydomesticvalvemanufacturer,development,imitationsoftsealinggatevalve,thisvalvehasthefollowingcharacteristicsthanthetraditionalwedgeorparalleldoublegate:thegateplateThevalveandbonnetofA.softsealinggatevalvearecastbyprecisioncasting,formingonce,basicallywithoutmechanicalprocessing,withoutusingsealedcopperring,savingnon-ferrousmetals.B.softsealinggatevalvebottomnopit,noaccumulationofslag,valveopeningandclosingfailurerateislow.C.softsealingrubberliningvalveplatehasuniformsizeandstronginterchangeability.Therefore,thesoftsealinggatevalvewillbethewatersupply industryiswillingtoadoptaform.Softsealinggatevalvediameterupto1500mmofdomesticmanufacturing,butmostmanufacturersinthe80-300mmdiameter,therearestillmanyproblemsinthedomesticmanufacturingprocess,thecasefromthestudy,theShanghaibodyofavalvemanufacturingcompanywascommissionedbythedomesticfoundryresinsandmoldingcasting,isimportedfromaforeigncompanysealsoftvalveplate.Thecompanybelievesthatthekeycomponentofthesoftsealinggatevalveistherubberlinedvalveplate,andtherubberliningvalveplatetechnologyrequirementsarehigher,notallforeignmanufacturerscanachieve,oftenfromthereliablequalityofthefactorypurchaseassembly.Thecoppernutblockofthedomesticsoftsealinggatevalveisinsertedabovetherubberliningvalveplate,similartothestructureofthegatevalve,becauseofthefrictionofthenutblock,therubberliningofthevalveplateiseasytobepeeledoff.Thesoftsealinggatevalveofaforeigncompanyisembeddedintheliningrubbergatetoformawhole,whichovercomestheaboveshortcomings,buttheconcentricityofthevalvecoverandthevalvebodyishigher.Openandclosesoftsealinggatevalve,mustnotbeclosedtodeath,aslongasthesealingeffectcanbeachieved,otherwiseitisnoteasytoopenorrubberliningstripping.AvalvemanufacturingcompanyinShandong,inthevalvepressuretest,theuseoftorqueplatehandtocontrolthedegreeofclosure,asawatercompanyvalveoperatorshouldalsobeeffectiveinthismethodofopeningandclosing.(3)butterflyvalve Someproblemsinbutterflyvalveselection:A.midlinebutterflyvalveMidlinebutterflyvalveinourcountrysmallcaliberbutterflyvalveinalargeamountofuse,theeffectisalsobetter.Therearetwodifferencesinthemanufacturingmethod:onekindofvalvebodylininglayerhassupportframe(representedbyTangguproducts);onekindofvalvebodylininglayerhasnosupportframe(representedbyZhengzhouproducts).Theformerhaslessrubberlining,andthelatterhaslargerflowarea.Itissuspectedthatthelattervalvehasashorterservicelife,butthisisnotthecase.ComparisonofB.verticalandhorizontalbutterflyvalvesInthemiddleandlargebutterflyvalve,thevalveshaftisthedifferencebetweenverticalandhorizontal,verticalbutterflyvalvecasingisusuallydeep,debrisinthewatereasilyspiralshaft,hoist;horizontalbutterflyvalvegearboxinthelateralplaneposition,thevalvewellsontheroadaccountforthewide,theimpactofthearrangementofotherpipelines.Therefore,themedium-sizedmediumdiameterbutterflyvalveisvertical,andthelargediameterbutterflyvalveishorizontalunderthelicenseofplaneposition.Bothverticalandhorizontalvalveopeningandclosingindicatorsshouldbetakensoastobeobservedfromtheground.C.eccentricbutterflyvalve Theclosingandsealingofthecentralbutterflyvalve,inessence,akindofrubberliningextrusionseal,especiallyinthevicinityofthevalveshaftissqueezedlarger,sothattheservicelifeofthevalveisaffected,thevalveopeningandclosingtorqueistoolarge.Toalleviatethisdrawback,designaone-dimensional,two-dimensionalandthree-dimensionaleccentricbutterflyvalve,whichdevelopedthree-dimensionaleccentricbutterflyvalve,thesealingstatetheoryisakindofsealingcontactstate,manymanufacturerstodevelopinthisarea,includingafactoryinTianjinareusingcomputercontrolledmachine,closetotherequirementsofthisproductintermsoftechnology.Eccentricbutterflyvalveonthebearingwaterpressureisdirectional,especiallythree-dimensionalbutterflyvalvereversepressurebearingcapacityisweak.Sincethepipenetworkisannular,therequirementofthevalvetwotobesubjectedtopressureisthesame,sotherequirementshouldbeemphasizedwhenordering.D.softsealandmetalsealMostofthebutterflyvalvesusedinthewatersupplyindustryaresoftsealedbutterflyvalves,whichhavethefollowingproblemsinuse:Rubberqualityispoor,easyaging,long-termcompressiondeformation,extrusioncracking;Thevalveinthemanufacturingprocess,itisdifficulttoensurethebutterflyplateinthevalvebodyconcentricity, oftentosolvetheproblemofsealingbyexcessiveextrusion,therebyaffectingtheservicelifeofthevalve;Verticalbutterflyvalveshaftandsleevemachiningaccuracyandthrustmodemisalignment,leadingtobutterflyplateshakingandsagging,formingaleakage;4.Butterflyvalvedamagedintheinstallationprocess,affectingthetightness.Somemanufacturershavemadethefollowingimprovementsfortheaboveproblems:Rubberringfixedpointoutsideproduction,strengthenthequalitycontrol,usuallyusedinwatersupplyindustryvalve,choosethreeyuanethylenepropylenerubberandacrylonitrilerubberandnaturalrubberisnotmuch,nomixingreclaimedrubber;InafactoryinHubeitosealthebutterflyplateontheblockboardintoshortpiecesdovetailassemblyconnectedtobalancethebutterflylifetoregulatethelevelofeachpartoftheextrusionplate,butthisadjustmentisverydifficulttomasterskills;3.DBbutterflyvalvesandflangebutterflyvalvesintroducedbyindividualfactoriesinTianjinandShanghai.Theirsealingapronsareinlaidindovetailgrooves,andtheyhaveacertainmarginofmotion.Theycanadjusttheextrusionconditionofapronswhenthebutterflyvalvecloses; Fourth,acompanyinHenanlauncheda"fluorineplastic"sealingringinsteadofrubbersealingring,improvethewearresistanceandagingresistanceofthesealingring;5.Manymanufacturershaveintroducedmetalsealingbutterflyvalveinsteadofapronsealbutterflyvalve.Becauseofthesmallelasticityoftheseal,themetalsealbutterflyvalveusuallyadoptstheeccentricstructure,especiallythethree-dimensionaleccentricstructureisideal.Metalsealbutterflyvalveusedinhigh-pressuresteampipeline,thepriceismoreexpensive,itisnoteasytodamageintheoperationofthesealingsurface,butitsmanufacturingaccuracyrequirements,oncetheleakageisdifficulttorepair.(4)ballvalveandplugvalveThemaindisadvantageisthebutterflyvalveplateoccupyacertaincrosssection,increasetheheadloss;valvealthoughthereisnoproblem,butthelarge-diameterverticalpipevalveofthehighimpactofoverburdendepth,largediameterhorizontalgatelength,horizontalareaoccupiedincreasedpipelineandotherpipelinearrangements;ballandplugvalvesaremaintainedthecrosssectionofthevalve,butalsoovercomeitsshortcomings.Ballvalvehastheadvantagesofsimplestructure,smallflowresistance,reliablesealing,flexiblemovement,convenientmaintenanceandoperation,etc..Plugalsohassimilaradvantagesovertheonlywaterparkareaisnotbeingshaped.Ballvalveandplugvalveareheavierthanbutterflyvalve, castingandprocessingisdifficult,thepriceismoreexpensive,generallyapplicabletosmallandmediumcaliberpipeline.Overthepasttenyearsduetoimprovementsincastingtechnology,usingEPCmethodorthemethodofresinsandcasting,machiningcanbeavoidedorreduced,therebyreducingthecostofballvalveusedforthefeasibilityoflarge-diameterpipeisworthexploring.InafactoryinHubeiaftertheAmericanproducts,developedafan-shapedeccentricplugvalves,fan-shapedvalveplatelinedwithrubber,sealing,openingandclosingtorqueissmall,largeflowarea,andtheDepartmentofthevalvethroughthemechanicaltestingcenterfortheopeningandclosingofthevalveinspectionandflowresistancedurabilitytesting,whichfilledtheblankofsuchvalvetype.Atpresent,thereisagrooveatthebottomofthefaneccentriccockvalve,easytoaccumulateslag,easytocauseopenandclosefault,shouldbeimproved.2.2valvematerial(1)valvesinthewatersupplynetwork,inthepast,thevalvebody,valvecover,transmissiongearboxmaterialismostlygraycastiron,partofductileiron.Inviewofthepipeandpipefittingsarewidelyusedductileiron,valvematerialshouldbelikethis.Toimprovethequalityofcastings,andreducetheweightofthevalve,especiallythevalveplateshouldfirstuseductileiron(QT405-10).Itshouldbepointedoutthatduetothedifferentthicknessofeachpartofthevalvebody,thedifficultyofcasting spheroidizationislarger,sothecorrespondingmeasuresshouldbetakentoensurethequalityofthecasting.Atpresent,therearestillsomeproblemsinthecastingofthevalvebody,suchasthephysicalandchemicalindicatorsofductileiron,inadditiontoindividualmanufacturers,mostofthecontrolisnotstrict,andwithsandcasting,alargenumberofmechanicalprocessingmolding.Recommendedthatmanufacturersestablishastrictqualitycontrolsystem,foralargenumberofsmallcalibervalveusinglostfoammethodmodeling,largediametervalvesusingresinsandmolding,castingandrequireproperandeffectivemeasurestoeliminatestress,measurestopromotetheblastingsand.Thedefectsofcastingsarenotallowedtobeeliminatedbymeansofweldingandrepair,otherwise,measuresshouldbetakentoeliminatetheinternalstresscausedbyweldingandrepair,andmakemorestrictinspection,andexplainthesituationtotheusers.Duringtheinvestigation,manyvalvemanufacturershavelearnedtheuseoftheassociationofcastingsolution,tocomplementeachother"sway,thepurchaseoftheassociationofcomponentsisalsoamodeofoperation,thekeyistocontrolthequalityofforeignpartsmustbestrictly.Ofcourse,forthepurchaseoflow-qualitycomponents,slightlydecorative,weartheirownbrands,thesalepriceofthepracticeshouldbestopped.(2)2CR13stainlesssteelisrecommendedforvalvestem.(3)thestemnutshallbemadeofcastaluminumbrassorcastaluminumbronze,andthehardnessandstrengthofthenutaregreaterthanthestem. 2.3valveopeningandclosingtorqueInordertoimplementtheopeningandclosingoftheartificialorlightvalveunderthepressureofworkoftheopeningandclosingtorqueislessthanorequalto240Nm,thatapersoncanoperate.Hopethatthevalvemanufacturerfirstoptimizethevalvestructuredesign,improvetheconcentricityofcomponentscombination,movingpartscontactsurfacefinish,Reducingopeningandclosingresistance.Itisnotidealtoreducetheopeningandclosingmomentonlybychangingthespeedratioofthegearboxandincreasingtheopeningandclosingrevolutions.Forthispurpose,therenewalofmachiningmeanscannotbeignored,suchasavalvefactoryinTianjin,inordertoimprovethequalityofmechanicalprocessing,alargenumberofcomputerprogram-controlledmachinetoolsandmachiningcenters,iscommendable.Sealingpackingfor2.4valvestemValveleakageoftenoccursinthesealingpackingofthestem,especiallylargediametervalvebecauseofthemaintenanceofthefillingwithoutwater,thecostisexpensive.Therefore,toimprovethedurabilityofsealingpackingisnecessary,ontheonehand,theappropriateuseofmaterials,noteasytoaging,twowearasmallpackingrequirements,coupledwiththenetworkinthelimitednumberofvalvesopenandclose,shouldnotseektoreplacedecadesofgood.Duringtheinvestigation, acompanyinShanghaiforvarioustypesofvalvesofthevalveshaftpackingfillerDN100-2600mmadoptsthreesmallrubberringandagumshield,aslongasthevalvebodyandthevalvecoverassemblyconcentricityguaranteedapronscontactsurfacefinish,accordingtothecompanytoensurethatthetenyearsofopeningandclosingthevalveshaftdoesnotdrip,sealthantheherringbonerubberring,flexiblegraphitepackingsosimple,andtheopeningandclosingtorquereductionadvantages,isworthyofreference.Variabletransmissionboxof2.5valveLargediametervalvebecauseoftherelationshipbetweentheopeningandclosingtorque,equippedwithavariabletransmissionbox.Forsuchcomponents,wehopetopayattentiontothefollowingpointsinmanufacturing:(1)theopeningandclosinglimitdeviceisinstalledontheboxbody,andtheadjustingnutofthedeviceshouldbeinthebox.(2)theboxstructureassmallaspossibleandfirm,iftheopeningandclosingoperationistooexcessive,nottotheboxrupture.(3)thetransmissionstructuredesignisreasonable,whenopeningandclosingcanonlydrivethevalveshaftrotation,donotmakeitmoveupanddown;thetransmissionpartsbitenormally,doesnotproducetheseparationslipwhentheloadisopenedandclosed. (4)thegearboxiseasytobesoakedinwaterintheareawithhighergroundwaterlevel,sotheboxshouldbesealed.Somevalvemanufacturerstothevalveshaftpackingattheshellandvariabletransmissionboxasawhole,oncethefillerleakage,itiseasytostringintothebox,whichisworthimproving.2.6valveoperatingmechanismThepipeinthewatersupplynetworkisusuallyburied,thevalveiswellprotected,thevalveisnotapplicable,andthevalveisopenandclosefromthegroundoperation,sothevalveopeningandclosingendshouldbesetsquaremortisecap,andthehandwheelisnotappropriate.Inthedirectionofopeningandclosing,therotaryvalveshouldbeturnedclockwise,andtheordershouldbespecified.Theopeningandclosingdegreeofthevalveshouldbemarkedwithaplate,whichshouldbeobservedfromtheground.Thescaleofthedialshouldbecastonthecasting,andthefluorescentpowdercanbebrushedsoastobeeye-catching.Aluminumandothermaterialsshouldnotbeused.Thescaleofthepointerandtheopeningandclosinglimitshouldbeadjustedbeforeinstallationandlocked.Recently,somemanufacturershavedesignedthecorrespondingopeningandclosingsignsforsmallandmediumcalibergatevalves,whichiscommendable.ThePerformanceandtestof2.7valveWhenevaluatingtheperformanceandperformanceofvalves, attentionshouldbepaidtothefollowingpoints:(1)valveopeningandclosingundertheworkingwaterpressureisflexibleandlight.Undertheworkingwaterpressure,torqueisusedtomovethehandtodetecttheopeningtorque.(2)thevalveclosestightly,at1.1timestheworkingpressure,noleakageorleakagetomeetthestandardrequirements(metalsealedbutterflyvalve),valveturnsonbothsidesoftherequiredpressureweremeasured,andrepeatedlyopenandclosetoachievethesameeffect.Requirementsofvariouscaliber,differenttypesofvalves,shouldbeinthemanufacturersandtestingunitsqualifiedforlifedetectionwithloadopeningandclosing.Thistestalsoincludestheevaluationofthesealingeffectofthevalveshaft.(3)valveflowcapacityisstronger.Especiallythebutterflyvalve,butterflyplateover-currentresistanceissmall,thefloweffectiveareaisbig.Thisrequiresavarietyofcaliber,differenttypesofvalvesshouldalsobedetectedinthequalificationunit,flowresistancecoefficientdetermination.(4)thecapacityofwaterpressureinsidethevalvebodyshouldbethesameasthatofthepipe.Thatis,thevalvecanwithstandthetestpressureofthepipelineundertheopeningconditionofthevalve.(5)intheinspectedfactory,IndividualvalvefactoryforDN=600mmthelifeofthevalve, flowresistanceandtorquetest,manyvalvefactorydoesnothavesuchmeans.Innerliningandexternalcorrosionprotectionof2.8valveValveisaproduct,theappearancequality,ontheonehandistheimageoftheproduct,ontheotherhand,installedinthevalvewell,sometimesimmersedinwater,sometimeslocatedinwetspace,topreventcorrosionisimportant.Valveistotransportdrinkingwaterequipment,valveliningmaterialmustbenon-toxic,tocorrosion,wearresistance,tosmooth,sothattheflowresistanceissmall.Especiallythebutterflyvalvebutterflyplate,plate,boltsandbutterflyplatesofdifferentmaterials,itispronetocorrosion,rustandcorrosiongeneratedextendingsealingsurface,affectingthesealingeffectofthevalve,soliningtoimprovecoverage.Theidealmethodisthatthevalvebody,thevalvecover,thegearboxofthevariablespeedtransmissionboxareshotandcleanedaftertheinsideandoutside,andthentheelectrostaticsprayingnon-toxicepoxyresincanachievetheaboveeffect.InTianjin,Shanghairelatedcompaniesonthesmallcalibervalvewillhavethisline.Mostmanufacturersarecoatedwithantirustpaintinsideandoutsidethevalvebody,somepaintcontainingleadandotherharmfulsubstances,doesnotmeetthehealthrequirements.2.9valveinstructionsValvesareequipment,andthefollowingtechnicaldatashouldbemarkedontheinstructionswhentheequipmentisoutofthe factory:Valvespecifications;model;workpressure;manufacturingstandards;bodymaterial;stemmaterial;sealingmaterial;packingmaterial;valveopeningandclosingdirection;speed;workingpressureundertheconditionofopeningandclosingtorque;manufacturingplantname:Date:weight;connectionflangediameter,holenumber,holecenterdistance,andhopeasshowninthefigureindicatethecontroloflength,widthandheightofthemark;flowresistancecoefficient;effectiveopeningandclosingtimesandinstallationandmaintenancemattersneedingattention.2.10valveprocurementThereareaboutmorethan2000valvemanufacturersinthecountry,morethan100inHenanProvince,andonlyafewpeopleinsomefactories.Therefore,thequalityandpriceofvalvemanufacturingareverylarge.Tothisend,stronglyurgethepartiesconcernedtorectifythevalvemanufacturingindustry,establishaqualitylicensesystem,banfakeproducts.BuyValvessuggestedthefollowingpoints:"(1)purchasemanufacturersmustnotsingle,goodsthanthree.(2)manufacturerschoosetopasstheISO9001qualitysystemcertificationoftheenterprise,andpayattentiontowhethertheselectedproductisthroughthequalitycertificationoftheproduct.(3)accordingtothedifferentusesofthevalve,accordingto theabovediscussionoftheproblem,theargument,toimprovethetechnicalrequirements.(4)highqualityvalves,thepriceisalsorelativelyexpensive,shouldbebasedontheoverallsituationofenterprises,intheperformancepriceratiotochoosetheproducttoadapttotheneedsofenterprises,itisimpossibletobeamodel,thesameprice.(5)thevalveopeningandclosingisnotfrequentinthepipenetwork,butthelossofeconomicandsocialbenefitsislarger,butthequalityoftheproductsisbetter,andtheproductswhichcannotberepairedforalongtimearethecommondesire.Ifforavarietyofreasons,theperformancepriceratioislower,thenweshouldfocusonthetimelinessofafter-salesservice.(6)thevalveisadevice,thevalvepackagingshouldnotbeignored,smalldiametervalveshouldstrivetocontainertransport,largediametervalvetodotheappropriatepackaging,toensuretheintegrityofthevalveinlong-distancetransportation.Flangeplateshouldbeaddedwhennecessary,sothatthematerialofthesealingsurfacecannotbechangedgreatly.(7)alotoftapwatercompanyfortheprocurementofthedisintegrationofthevalveshouldbeproperlyreinspection,pressuretest,unqualifiedproducts,nonpaymentmeasures,hascertaineffect,thereisnoproductcanbefoundinthehouseoftheexemption. (8)thevalveshouldbestoredinthewarehouse,ifthelargecalibervalvecannotbeputintothewarehouse,theopen-airplaceshouldalsopayattentiontothebottomdrainage,theaboveshouldbecovered,shouldnotbeexposedtothesunandrain.Inspectionfoundthatmanymanufacturersproducednewvalveshavebeenplacedintheopenair,rain,thevalveisalsotheuseofunits,thismustbecorrected.2.11valveassembly(1)connectionmodeofvalveandpipelineInordertofacilitatetheinstallationanddisassemblyofvalves,Generallyconnectedtothevalveandthepipelinecanbeinstalledononesideoftheretentivetelescopicdevice,someenterprisesforDNthan400mmvalveswithsingledisccouplings(liveflanges)insteadofretentivetelescopicdevice.Nowsomevalvemanufacturershavefixedtelescopicvalveproducts,iswelcome,butthepriceishigherthanthegeneralvalveplustelescopicdeviceisnotreasonable,affectingthepromotionofitsuse.(2)thevalveshouldnotenterthesitetooearlyThepipelineconstructionisalongprocess,oftenworryaboutthepersoninchargeofconstructionmaterialsupplyproblems,valvesandotherancillaryequipmentstartputintothesite,evenbyaone-timeinstallationstaketransportedtothesite,sothevalveputinafewmonthsatthesiteofthesunandrain, lackofsupervision,theproblemiseasytoproduce.Theproposedpipelineconstructionprocess,withadoublereplacementtubeconnectedtothecompletionofpipelineconstruction,pipeandvalvewellsmasonrydebrisaftercleaning(wellsontheprecastreinforcedconcretepanelsarenotcovered),andthentransportedtothesiteonebyonevalveinstallation,andthencompletethepuzzleoffinishingwell.Beijingwatersupplycompanylargediametervalveinstallationistotakesuchmeasures,itisworthlearning.(3)inspectionaftervalveassemblyThevalveinthevalveassemblyon-sitesupervisionandacceptancepersonnel,toinspecttheassembly,whethertomeettherequirementsofthedrawings;whetheritmeetstheneedsofthemanagementofoperation;openingandclosingcheck,openandclosereadingsandtheactualsituationofopeningandclosingisconsistent;theopeningandclosingspeedisconsistentwiththeinstructions;largediameterpipesshouldbedrilledintothetubeandcheckcleanthesealingsurface;andmakeinspectionrecords,theestablishmentofthevalvetechnologyarchives.Operationandmanagementof2.12valvesThevalvecanopenandclosewell,notonlytoselectionoftherightvalve,theproductofgoodquality,wellconstructionandinstallation,butalsothoughtfulmanagement,inordertoplay"theideathatJapan,oneday"effect. Goodoperationmanagementisembodiedinthefollowingthreeaspects:Thetechnicaldataareallavailable;thevalveoperationiswellmanaged;thevalvewellisingoodcondition.(1)technicaldataofvalvesThetechnicaldataofthevalveincludethevalveinstructions;thechecklistaftervalvepurchase;thevalveassemblyandpositioncard;thevalvemaintenancerecord.Forthechangeofthestreet,thevalvecardshouldbeupdatedintime,andstrivetoestablishGISmanagementsystem.(2)valveoperationmanagementThequalityofvalveoperationandmanagementrequirementsincludingthevalveshouldbeclosedtightlyorclose;thevalveshaftsealisnotpaddingstringleakage;valveopeningandclosinglight,indicatingintact.Dailyoperationofvalveoperationincludestheapprovalandrecordofthepreviousoperationandclosingofthevalveandtheimprovementoftheoperationrecord;theopeningandclosingrecordofthevalveperiodicinspection.Forthevalvewhichhasnotbeenoperatedforalongtime,accordingtothesizeofthecaliber,itisnecessarytodeterminethedifferentcycleofinspectioncycle,usuallyonlythenumberofopenandcloseactivitiespickup,ifyouwanttocompletelyshutdownoperationisprudent.Forthefoundfault,thecorrespondinglargeandmediumrepairplanshouldbeputforward,timelytreatment,especiallyaftertheclosureofthevalvecannotbeopenedasemergencyrepairburst pipeasanemergencytreatment.(3)valvewellconditionWellconditionsincludevalveshaftvalvemasonrycomplywiththedesignrequirements;coversthelosslessandtheroadlinkintact;operationofthevalveholepositionaccuracy;nodebriswellsandsewagevalvesurfacewithoutrust.Becausethevalvewellisaconfinedspace,itiseasytoformhypoxiaandincreasethecarbondioxidecontent.Oncethemaintenancepersonneldonotcarryoutstrongblast,ventilationandothermeasuresbeforethewelloperation,itiseasytoendangerhumanlife.Thetechnicalmeasuresoflongtermconvectioninwellboreshouldbetakenintoaccountwhenconditionspermit.Forthevalveshaftshouldberegularlypatrol,timelytreatmentofpressureburiedproblem,formanholecoverloss,damageshouldbelikeemergencyrepairburstpipeasemergencytreatment.Wuhantapwatercompanyproposedtotherequirementsofthevalveinthepipenetworkasthemanagementofequipmentmanagement,theuseofGPSsatellitepositioningsystem,theestablishmentofthevalvewellscoordinatedata,proposedrulesandassessmentofinspectionstandardforevaluation,strengtheningmanagementmeasuresshouldbeinthesameindustryreference.'