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Amavalvu ovemvane alula, mancane, futhi alula kunezinye izinhlobo zamavalvu okulawula, okuwenza abe yisinqumo esingcono kakhulu sokulawula ukugeleza ezinhlelweni eziningi. Amavalvu ovemvane ajwayelekile asetshenziswa ngokwesiko ukuvula/ukuvala okuzenzakalelayo izinhlelo zokusebenza, futhi ayifanele kahle le ndima. Kodwa-ke, uma kukhulunywa ngokulawula ukugeleza ohlelweni lwe-loop evaliwe, abanye onjiniyela bakubheka njengokungamukelekile.
I-valve uvemvane isebenzisa idiski ejikelezayo ukulawula ukugeleza ngepayipi. Ama-disc ngokuvamile angasebenza ngamadigri angu-90, ngakho-ke ngezinye izikhathi abizwa ngokuthi ama-valve e-quarter-turn. Ngokuvamile, zisetshenziswa uma kucatshangelwa umnotho. Uma ukuvala okuqinile kudingekile, amavalvu ovemvane anezigxivizo ezithambile ezinwebekayo kanye/noma amadiski amboziwe angasetshenziswa ukunikeza ukusebenza okudingekayo. Ivalvu uvemvane (HPBV) -noma i-double offset valve-manje isiyindinganiso yemboni yamavalvu okulawula uvemvane futhi isetshenziswa kabanzi ukulawula ukuphehla. Zisebenza kahle ezinhlelweni zokusebenza ezinokwehla kwengcindezi engashintshi noma amaluphu enqubo ehamba kancane.
Izinzuzo ze-HPBV zihlanganisa indlela yokugeleza eqondile, umthamo ophezulu, kanye nekhono lokudlula kalula imidiya eqinile ne-viscous. Izindleko zabo zokufaka ngokuvamile ziphansi kakhulu kuzo zonke izinhlobo zama-valve, ikakhulukazi i-NPS 12 nama-valve amakhulu. Uma kuqhathaniswa nezinye izinhlobo zama-valve, inzuzo yabo yezindleko ikhula kakhulu lapho usayizi udlula amayintshi angu-12.
Anganikeza ukusebenza okuhle kokuvala ebangeni lokushisa elibanzi, futhi anikeze imiklamo ehlukene ye-valve yomzimba, okuhlanganisa uhlobo lwe-wafer, uhlobo lwe-lug kanye ne-flange ephindwe kabili. Alula kakhulu kunezinye izinhlobo zama-valve futhi ahlangene kakhulu. Isibonelo, i-valve yebhola engu-12-intshi ye-ANSI Class 150 ene-flange ephindwe kabili inesisindo esingamaphawundi angu-350 futhi inobukhulu bobuso nobuso obungama-intshi angu-13.31, kuyilapho i-valve yama-butterfly eyi-intshi engu-12 intshi inesisindo esingamaphawundi angu-200 kuphela ubuso nobuso. ubukhulu bobuso obungamayintshi angu-3.
Amavalvu ovemvane anemikhawulo ethile ewenza angakufanelekeli ukulawula ukugeleza kwezinye izinhlelo zokusebenza. Lokhu kufaka phakathi amandla okwehlisa ingcindezi elinganiselwe uma kuqhathaniswa nama-valve ebhola, ane-cavitation enkulu noma amandla akhanyayo.
Ngenxa yokuthi indawo enkulu ye-disc isebenza njenge-lever yokusebenzisa amandla ashukumisayo we-medium egelezayo ku-drive shaft, ama-valve e-butterfly ejwayelekile ngokuvamile awasetshenziselwa izicelo zokucindezela okuphezulu. Uma kunjalo, usayizi nokukhethwa kwe-actuator kuba bucayi.
Ngezinye izikhathi kwenzeka ukuthi i-valve yokulawula i-butterfly ikhulu kakhulu, ezoba nomthelela omubi ekusebenzeni kwenqubo. Lokhu kungase kube ngenxa yokusetshenziswa kwamavalvu angangepayipi, ikakhulukazi amavalvu ovemvane anamandla amakhulu. Ingakhuphula ukuhlukahluka kwenqubo ngezindlela ezimbili. Okokuqala, usayizi oweqile uletha inzuzo eningi kakhulu ku-valve, futhi ngaleyo ndlela sintula ukuguquguquka ekulungiseni isilawuli. Okwesibili, ama-valve amakhulu kakhulu angase asebenze kaningi lapho kuvuleka amavalvu aphansi, kuyilapho ukungqubuzana kokuvala kwamavalvu ovemvane kungase kube kukhulu. Ngoba ngokukhuphuka kwe-valve yokushaywa kwe-valve, i-valve enkulu ngokweqile izokhiqiza izinguquko ezinkulu ngokulinganayo zokugeleza. Lesi simo sizokwengeza kakhulu ukuhlukahluka kwenqubo okuhlotshaniswa nendawo efile ngenxa yokungqubuzana.
Abasetha ikhodi ngezinye izikhathi basebenzisa amavalvu ovemvane ngezizathu zezomnotho noma ukuze bavumelane nosayizi wepayipi onikeziwe, kungakhathaliseki ukulinganiselwa kwabo. Kunomkhuba wokwenza i-valve ye-butterfly ibe mkhulu ukuze kugwenywe ukukhama ipayipi, okungaholela ekulawuleni inqubo engalungile.
Umkhawulo omkhulu ukuthi uhla lokulawula ukudonsa olufanele alubanzi njengevalve yokumisa noma i-valve yebhola ehlukanisiwe. Amavalvu ovemvane ngokuvamile awasebenzi kahle ngaphandle kwebanga lokulawula lokuvula elicishe libe ngu-30% kuya ku-50%.
Ngokuvamile, lapho iluphu yokulawula isebenza ngendlela yomugqa futhi inzuzo yenqubo iseduze noku-1, iluphu kulula ukuyilawula. Ngakho-ke, inzuzo yenqubo engu-1.0 iba yithagethi yokulawula iluphu okuhle, futhi ububanzi obamukelekayo bungu-0.5 ukuya ku-2.0 (ububanzi 4:1).
Ukusebenza kuhle kakhulu uma inzuzo enkulu yeluphu ivela kusilawuli. Qaphela ukuthi ejikeni lokuzuza loMfanekiso 1, inzuzo yenqubo iba phezulu kakhulu esifundeni esingaphansi cishe kwama-25% we-valve stroke.
Inzuzo yenqubo ichaza ubudlelwano phakathi kokukhishwa kwenqubo kanye nezinguquko zokufakwayo. I-stroke lapho inzuzo yenqubo igcinwa khona phakathi kuka-0.5 no-2.0 wuhlu lokulawula olulungile lwe-valve. Uma inzuzo yenqubo ingekho kububanzi obungu-0.5 kuya ku-2.0, ukusebenza okuguquguqukayo okungekuhle nokungaqini kweluphu kungase kwenzeke.
Lapho i-valve ivaliwe ukuze ivuleke, idizayini ye-butterfly valve disc inomthelela omkhulu ekugelezeni kwe-valve. I-disc enezici zephesenti ezilinganayo inganxephezela kangcono ukwehla kwengcindezi okushintsha ngezinga lokugeleza. Amaphesenti alinganayo abangaphakathi azohlinzeka ngezici zokufaka ezilandelanayo ukuze kushintshwe ukwehla kokucindezela, okulungile. Umphumela uwushintsho olunembe kakhudlwana phakathi kokugeleza nokushaywa kwe-valve.
Muva nje, ama-valve ovemvane angasebenzisa ama-disc anezici zokugeleza zamaphesenti alinganayo. Lokhu kunikeza isici sokufaka esiholela ekuzuzeni inqubo yokufaka phakathi kwebanga elidingekayo lika-0.5 kuya ku-2.0 ebangeni elibanzi lohambo. Lokhu kuzothuthukisa kakhulu ukulawulwa kwe-throttling, ikakhulukazi ebangeni eliphansi lokuhamba.
Lo mklamo unikeza ukulawula okuhle, ngenzuzo eyamukelekayo engu-0.5 kuya ku-2.0 kusukela cishe kokuvula okungu-11% kuya ku-70%, futhi ububanzi bokulawula bucishe buphindwe kathathu kunalelo levalve uvemvane olusebenza kahle kakhulu (HPBV) olunosayizi ofanayo. Ngakho-ke, ama-disc amaphesenti alinganayo ahlinzeka ngokuhlukahluka kwenqubo ephansi.
Ama-valve ovemvane anezici zephesenti ezilinganayo, njengama-valve ediski okulawula, alungele izinqubo ezidinga ukusebenza kokulawula ukuncibilika okunembile. Kungakhathaliseki ukuthi yiziphi iziphazamiso zenqubo, zingalawulwa eduze nendawo ebekiwe, ngaleyo ndlela kuncishiswe ukuhlukahluka kwenqubo.
Uma i-valve ye-butterfly ingasebenzi kahle, vele ubeke i-valve ngosayizi ofanele ukuxazulula inkinga. Isibonelo, inkampani yephepha isebenzisa ama-valve amabili ovemvane amakhulu kakhulu ukuze ilawule ukukhishwa komswakama ku-pulp. Ama-valve amabili asebenza ngaphansi kuka-20% we-stroke, okuholela ekuhlukeni kwenqubo ka-3.5% no-8.0%, ngokulandelana. Iningi lempilo yabo yesevisi lichithwa kumodi yezandla.
Kufakwe amavalvu evemvane amabili e-NPS 4 Fisher Control-Disk anezilawuli zamavalvu edijithali. I-loop manje isebenza kwimodi ezenzakalelayo, ukuhlukahluka kwenqubo ye-valve yokuqala kuye kwanda kusuka ku-3.5% kuya ku-1.6%, futhi ukuhlukahluka kwenqubo ye-valve yesibili kuye kwanda kusuka ku-8% kuya ku-3.0%, ngaphandle kokulungiswa okukhethekile kwe-loop.
Ukucindezela kwamanzi okungekuhle kanye nokulawulwa kokugeleza kwesistimu yokupholisa embonini yensimbi kuholele ekuphambeni komkhiqizo wokugcina. I-HPBV efakwe e-Jiutai ayikwazanga ukulawula kahle ukugeleza kwamanzi njengoba kudingeka.
Isikhungo sithemba ukufaka ama-valve angalawula kangcono inqubo futhi adinga ukunciphisa izindleko zokuwafaka. Imboni izosebenzisa u-$10,000 ukushintsha amapayipi evalvu ngayinye ukuze isuke ku-HPBV iye kumavalvu ebhola ahlukene. Esikhundleni salokho, u-Emerson uncoma ukuthi ivalvu uvemvane i-Control-Disk ilingane nosayizi wamanje wobuso nobuso we-HPBV.
Ivalvu ye-Control-Disk yahlolwa kanye neyodwa yama-HPBV ayisishiyagalolunye akhona, futhi ukusebenza kwayo kwahlangabezana nezidingo ezishiwo. Imboni yashintsha ama-HPBV angu-8 asele kungakapheli unyaka, futhi i-HPBV ngayinye yayifakwe ivalvu yokulawula iDiski. Lokhu kwaqeda isidingo sokushintsha amapayipi angama-$90,000 wamavalvu ebhola ahlukene, futhi izindleko zamavalvu ebhola zenyuka cishe ngo-25% uma kuqhathaniswa namavalve ovemvane.
Amavalvu e-Control-Disk ahlinzeka ngokulawula okunembile futhi asize ekuqedeni ukuhlukahluka komkhiqizo wokugcina. Imboni yensimbi ilinganisela ukuthi ukufaka amavalvu e-Control-Disk ayisishiyagalolunye kungonga cishe u-$1 million ngonyaka.
Uma kuqhathaniswa nezinye izinhlobo zamavalvu amaningi, i-HPBV enendawo yedijithali inezindleko eziphansi zokufaka zokuqala futhi inganikeza ububanzi obanele bokulawula uma usayizi ulungile. Banomthamo ophezulu kanye nemikhawulo encane yokugeleza. I-valve uvemvane enamaphesenti alinganayo angokwemvelo ezingxenye zangaphakathi inikeza ithuba lokukhulisa ububanzi bokulawula, obufana nevalvu yembulunga noma i-valve yebhola, futhi ithatha kuphela isikhala se-HPBV.
Lapho ukhetha amavalvu, ikakhulukazi i-HPBV, qiniseka ukuthi angusayizi ofanele, ngaphandle kwalokho angase alawulwe mathupha igumbi lokulawula. Kubalulekile futhi ukucabangela uhlobo lwe-valve, izici zemvelo, nosayizi we-valve ohlinzeka ngebanga lokulawula elibanzi kakhulu lohlelo lokusebenza.
UMark Nymeyer ungumphathi wezokuxhumana emhlabeni wonke wokulawula ukugeleza kwa-Emerson Automation Solutions.
Lokhu akulona i-paywall. Lolu udonga lwamahhala. Asifuni ukuvimba inhloso yakho yokuza lapha, ngakho-ke lokhu kuzothatha imizuzwana embalwa.
Isikhathi sokuthumela: Oct-11-2021
