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Npauj npaim li qub yog sib zog, me thiab sib zog dua lwm hom kev tswj li qub, ua rau lawv xaiv zoo tshaj plaws rau kev tswj cov dej ntws hauv ntau daim ntawv thov.Txawm li cas los xij, tus qauv npauj npaim li qub tau siv rau hauv kev siv tsis siv neeg qhib / tawm thiab lawv zoo meej rau lub luag haujlwm no. , qee tus engineers xav tias lawv tsis tuaj yeem lees txais thaum nws los txog rau kev tswj cov dej ntws hauv lub kaw lus kaw.
Npauj npaim li qub siv cov rotating discs los tswj cov dej ntws los ntawm cov kav dej.Discs feem ntau ua haujlwm 90 degrees, yog li lawv qee zaum hu ua lub kaum sab xis. thiab/los yog coated discs yuav siv tau los muab cov kev ua tau zoo.High Performance Butterfly Valves (HPBVs) - los yog Ob Chav Offset Valves - tam sim no tus qauv kev lag luam rau npauj npaim tswj li qub thiab tau dav siv rau kev tswj throttling.Lawv ua tau zoo rau kev siv nrog qhov siab tsis tu ncua los yog cov txheej txheem qeeb.
Qhov zoo ntawm HPBV suav nrog txoj hauv kev ncaj nraim, muaj peev xwm siab, thiab muaj peev xwm dhau los ntawm cov khoom khov thiab cov kua nplaum uas yooj yim.Lawv feem ntau muaj tus nqi qis tshaj plaws ntawm txhua hom valve, tshwj xeeb tshaj yog nyob rau hauv NPS 12 thiab qhov ntau thiab tsawg.Lawv cov nqi kom zoo dua ntxiv. piv rau lwm hom li qub hauv qhov ntau thiab tsawg tshaj 12 ntiv tes.
Lawv muab kev kaw haujlwm zoo tshaj qhov kub thiab txias ntau yam thiab muaj nyob rau hauv ntau lub cev tsim xws li wafer, lug thiab ob flanged.Lawv muaj zog ntau dua hauv qhov hnyav thiab ntau dua li lwm hom li qub.Piv txwv li, 12-nti ANSI Chav Kawm 150 ob-flanged segmented pob valve hnyav 350 phaus thiab muaj lub ntsej muag-rau-lub ntsej muag ntawm 13.31 ntiv tes, thaum 12-nti lug npauj npaim valve sib npaug hnyav tsuas yog 200 phaus thiab muaj 3-nti ntsej muag-to-face dimension.
Npauj npaim li qub muaj qee qhov kev txwv uas ua rau lawv tsis tsim nyog rau kev tswj kev khiav hauv qee yam kev siv.Cov no suav nrog kev txo qis peev xwm piv rau lub ntiaj teb pob li qub uas muaj peev xwm ntau dua rau cavitation lossis flash evaporation.
Vim tias thaj tsam loj ntawm lub disc ua haujlwm zoo li lub zog, siv lub zog dynamic ntawm qhov nruab nrab ntws mus rau tus tsav lub tog raj kheej, cov qauv npauj npaim li qub feem ntau tsis siv rau kev siv siab siab.Thaum lawv yog, qhov loj thiab kev xaiv ua qhov tseem ceeb.
Npauj npaim tswj li qub tuaj yeem qee zaum loj dua, uas tuaj yeem cuam tshuam cov txheej txheem kev ua haujlwm tsis zoo.Qhov no yuav yog vim siv cov kab loj li qub, tshwj xeeb tshaj yog muaj peev xwm ua tau zoo npauj npaim li qub. valve nce ntau dhau, ua rau tsis yooj yim rau kev kho tus maub los.Qhov thib ob, lub valve loj tuaj yeem ua haujlwm ntau dua ntawm qhov qhib lub valve, thiab kev sib txhuam kev sib txhuam yuav ntau dua nyob rau hauv npauj npaim valve.Vim tias lub valve oversized ua rau qhov tsis sib xws loj txaus hloov rau ib muab increment ntawm valve mus ncig teb chaws, qhov no tshwm sim heev exaggerates tus txheej txheem variability txuam nrog kev sib txhuam-induced deadband.
Specifiers qee zaum siv npauj npaim li qub kom txuag tau nyiaj lossis ua kom haum rau cov kab me me txawm tias lawv cov kev txwv tsis pub dhau.Muaj ib txoj hauv kev kom loj dua npauj npaim li qub kom tsis txhob pinching cov kav dej, uas tuaj yeem ua rau cov txheej txheem tsis zoo.
Qhov kev txwv loj tshaj plaws yog qhov zoo tshaj plaws throttle tswj ntau yam tsis yog dav li lub pob valve lossis segmented pob valve.Npaj npaim li qub feem ntau tsis ua haujlwm zoo sab nraum qhov kev tswj hwm ntawm li 30% mus rau 50% qhib.
Feem ntau, lub voj voog yog qhov yooj yim tshaj plaws los tswj thaum lub voj tswj kev ua haujlwm nyob rau hauv ib qho kev sib tw thiab cov txheej txheem nce yog nyob ze rau kev sib koom ua ke.Yog li ntawd, cov txheej txheem nce ntawm 1.0 dhau los ua lub hom phiaj rau kev tswj lub voj voog zoo, nrog rau kev siv ntau yam ntawm 0.5 txog 2.0 ( ib 4:1 range).
Kev ua tau zoo yog qhov zoo tshaj plaws thaum feem ntau ntawm cov voj voog nce los ntawm tus maub los.Nco ntsoov tias nyob rau hauv qhov nce nkhaus ntawm daim duab 1, cov txheej txheem nce siab heev hauv cheeb tsam hauv qab no txog 25% ntawm kev mus ncig valve.
Cov txheej txheem nce qib txhais cov kev sib raug zoo ntawm cov txheej txheem tso tawm thiab cov tswv yim hloov pauv.A stroke qhov twg cov txheej txheem nce nyob nruab nrab ntawm 0.5 thiab 2.0 yog qhov zoo tshaj plaws tswj ntau yam rau lub valve.Thaum cov txheej txheem nce tsis nyob rau hauv 0.5 mus rau 2.0 ntau yam, kev ua haujlwm tsis zoo thiab lub voj voog. instability yuav tshwm sim.
Npauj npaim disc tsim muaj qhov cuam tshuam tseem ceeb ntawm lub valve ntws raws li lub valve mus los ntawm kaw mus rau qhib.Discs nrog cov yam ntxwv sib npaug ntawm cov feem pua zoo dua tuaj yeem them rov qab rau cov kev poob siab uas sib txawv nrog cov dej ntws. Qhov feem pua ntawm qhov sib npaug yuav muab cov yam ntxwv sib txawv ntawm qhov sib txawv siab, uas yog qhov zoo tagnrho.Qhov tshwm sim yog qhov tseeb dua, ib-rau-ib variation ntawm ntws thiab valve mus ncig.
Npauj npaim li qub tsis ntev los no tau qhia cov discs nrog qhov sib npaug feem pua ntawm cov yam ntxwv.Qhov no muab cov yam ntxwv ntawm kev teeb tsa uas tso cai rau kev txhim kho cov txheej txheem nce hauv qhov xav tau 0.5 txog 2.0 ntau yam dhau qhov dav dav.
Qhov kev tsim no muab kev tswj kom zoo, nrog rau qhov tau txais txiaj ntsig ntawm 0.5 mus rau 2.0, los ntawm kwv yees li 11% qhib rau 70%, ze li peb npaug ntawm kev tswj hwm ntau dua piv rau kev ua haujlwm siab npauj npaim valve (HPBV) ntawm tib qhov loj. , sib npaug feem pua ntawm cov disks muab tag nrho cov txheej txheem qis dua.
Npauj npaim li qub uas muaj qhov sib npaug feem pua ntawm cov yam ntxwv, xws li Control-Disk valve, yog qhov zoo tagnrho rau cov txheej txheem uas yuav tsum tau muaj kev tswj xyuas qhov tseeb.Lawv tuaj yeem tswj tau los ze zog rau lub hom phiaj teeb taw tes tsis hais txog kev cuam tshuam ntawm cov txheej txheem, txo cov txheej txheem sib txawv.
Yog tias tus npauj npaim valve tsis ua haujlwm zoo, tsuas yog hloov nws nrog lub valve kom zoo yuav daws tau qhov teeb meem.Piv txwv li, lub tuam txhab ntawv siv ob lub npauj npaim li qub los tswj cov dej noo tshem tawm ntawm pulp.Ob lub valve tau ua haujlwm tsawg dua 20% kev mus ncig, ua rau cov txheej txheem sib txawv ntawm 3.5% thiab 8.0%, feem. Feem ntau ntawm lawv lub neej yog siv nyob rau hauv phau ntawv hom.
Ob qhov loj me NPS 4 Fisher Control-Disk npauj npaim li qub nrog cov tswj lub valve tau teeb tsa.Lub voj tam sim no khiav hauv hom tsis siv neeg nrog cov txheej txheem sib txawv ntawm 3.5% mus rau 1.6% rau thawj lub valve thiab 8% rau 3.0% rau lub valve thib ob yam tsis muaj ib qho tshwj xeeb voj tuning.
Cov dej tsis zoo thiab kev tswj cov dej ntws hauv cov hlau zeb lub tshuab ua kom txias ua rau cov khoom tsis sib xws.Lub cuaj ntsia HPBVs tsis tuaj yeem tswj cov dej ntws zoo raws li qhov xav tau.
Cov nroj tsuag xav txhim kho li qub uas yuav tswj tau cov txheej txheem zoo dua thiab xav tau kom txo qis kev teeb tsa.Cov nroj tsuag yuav siv $ 10,000 los hloov cov kav dej rau txhua lub valve kom hloov ntawm HPBV mus rau segmented pob li qub.Xwb, Emerson pom zoo siv Control-Disk npauj npaim. valve uas ua tau raws li lub ntsej muag ntawm qhov ntev ntawm HPBVs tam sim no.
Lub Control-Disk valve tau sim ib sab ntawm ib sab nrog ib qho ntawm cuaj HPBVs uas twb muaj lawm thiab nws ua tau raws li qhov yuav tsum tau ua.Cov nroj tsuag hloov yim HPBVs ntxiv hauv ib xyoos, txhua qhov nruab nrog Control-Disk valve, tshem tawm qhov xav tau. los hloov qhov $ 90,000 cov kav dej rau lub segmented pob valve, thiab lub pob valve raug nqi kwv yees li 25% ntau dua li npauj npaim valve.
Control-Disk li qub muab kev tswj xyuas meej thiab pab tshem tawm qhov sib txawv ntawm cov khoom kawg.Lub zeb kwv yees kev teeb tsa ntawm cuaj Control-Disk li qub yuav txuag tau txog $ 1 lab ib xyoos ib zaug.
Piv nrog rau feem ntau lwm hom valve, HPBVs nrog digital positioners tau qis dua tus nqi pib installation thiab, thaum qhov loj me, muab cov kev tswj kom txaus.Lawv muaj peev xwm thiab tsis tshua muaj kev txwv.Npaj npaim li qub nrog qhov sib npaug ntawm qhov feem pua trims muab lub sijhawm los txuas ntxiv kev tswj hwm. ntau yam, zoo ib yam li lub ntiaj teb lossis pob li qub, thiab tsuas yog siv qhov chaw ntawm HPBV.
Thaum xaiv cov li qub, tshwj xeeb tshaj yog HPBVs, xyuas kom tseeb tias lawv yog qhov loj me, txwv tsis pub lawv yuav raug tswj los ntawm chav tswj. daim ntawv thov.
Mark Nymeyer yog tus thawj tswj hwm kev lag luam thoob ntiaj teb rau Emerson Automation Solutions, lub luag haujlwm rau kev tswj tsheb.
Qhov no tsis yog paywall.Qhov no yog phab ntsa pub dawb.Peb tsis xav kom nkag mus rau hauv txoj kev ntawm koj lub hom phiaj ntawm no, yog li nws tsuas siv ob peb feeb xwb.
Post lub sij hawm: Jan-20-2022
