I-valve yokulawula umoyakusukela kumgomo oyisisekelo, ukuhlanganisa, ukugcinwa kuwufanele ukuba nobuchwepheshe be-valve: isimiso sokusebenza sokulawula umoya womoya incazelo enemininingwane
I-pneumatic control valve ingenye yamaphaneli okulawula inqubo yezimboni asetshenziswa uwoyela ongahluziwe, imboni yamakhemikhali, ubunjiniyela bamandla kagesi, imboni ye-metallurgical namanye amabhizinisi okukhiqiza. Ivalvu elawulayo ebhizinisini lamakhemikhali ibaluleke kakhulu kumodi yokulawula, okuyingxenye ebalulekile yobuchwepheshe bokukhiqiza ezishintshayo kwezimboni, njengezandla nezinyawo zenqubo yokukhiqiza ezishintshayo. Ngezansi, kukuthatha ndawonye ukuze uqonde i-valve yokulawula umoya.
I-pneumatic control valve ingenye yamaphaneli okulawula inqubo yezimboni asetshenziswa uwoyela ongahluziwe, imboni yamakhemikhali, ubunjiniyela bamandla kagesi, imboni ye-metallurgical namanye amabhizinisi okukhiqiza. Ivalvu elawulayo ebhizinisini lamakhemikhali ibaluleke kakhulu kumodi yokulawula, okuyingxenye ebalulekile yobuchwepheshe bokukhiqiza ezishintshayo kwezimboni, njengezandla nezinyawo zenqubo yokukhiqiza ezishintshayo. Ngezansi, kukuthatha ndawonye ukuze uqonde i-valve yokulawula umoya.
isimiso
I-valve yokulawula umoya isekelwe kakhulu kugesi ocindezelwe njengethuluzi lamandla, kusilinda njenge-actuator yomoya, futhi ngosizo lwe-valve yemishini kagesi, i-converter, i-relay, i-valve egcinayo nezinye izesekeli zokukhuthaza i-valve, ukufeza isignali yokushintsha. noma ukulawula okulinganayo, ukwamukela imiyalelo yokulawula yokukhiqiza kwemboni uhlelo lokulawula okuzenzakalelayo ukuze kuqedelwe ukulungiswa kwendawo yepayipi: Ukugeleza okuphelele, ingcindezi yokusebenza, izinga lokushisa nezinye izinkomba zobuchwepheshe. I-valve yokulawula umoya ibonakala ngokusebenza okulula, ukusabela okusheshayo, kanye nesistimu yokuphepha, asikho isidingo sokusebenzisa amadivaysi angaqhuma ngaphezu kwalokho.
◆◆ ◆
Isimiso se-valve yokulawula umoya
I-valve elawula umoya womoya ngokuvamile yakhiwa i-actuator yomoya kanye nokulawula ukufakwa kwemishini yokuxhuma i-valve nokulungisa iphutha, i-actuator ye-pneumatic ingahlukaniswa ibe umsebenzi owodwa noma umphumela okabili uhlobo lwesibili, i-actuator yokusebenza eyodwa inesiphethu esingunxande, futhi i-actuator yokusebenza kabili ayinaso isiphethu esingunxande. Phakathi kwe-actuator yomsebenzi owodwa, kusukela ekulahlekeni komthombo noma ukwehluleka okungazelelwe, ukubuyisela okuzenzakalelayo ku-valve ekuqaleni kwakusetha isimo esivuliwe noma sokuvala.
I-valve yokulawula i-pneumatic ngokwendlela yesenzo ihlukaniswe yaba izinhlobo ezimbili zegesi evulekile yohlobo lwegesi evaliwe, uhlobo olubizwa ngokuthi oluvame ukuvuleka futhi uhlobo oluvame ukuvuleka noluvamise ukuvaleka, igesi ye-valve elawula umoya womoya evulekile noma igesi ivaliwe, ngokuvamile ngokuvula kabili. umphumela oseceleni we-actuator nesakhiwo se-valve akuyona indlela yokuhlanganisa efanayo okufanele iqedwe.
◆◆ ◆
I-pneumatic regulating valve action mechanism
Uhlobo oluvulekile lwegesi (uhlobo oluvame ukuvuleka noluvamise ukuvaleka) lapho ukucindezela kwegesi phezulu kwe-membrane kuphakanyiswa, i-valve iyanda endaweni yezinga lokuvula. Lapho umkhawulo wokucindezela ojwayelekile ufinyelelwa, i-valve isesimweni esivulekile. Ngokuphambene nalokho, lapho ukucindezela kwegesi kuncishisiwe, i-valve ibekwe endaweni evaliwe, futhi uma kungekho gesi efakiwe, i-valve ivalwe ngokugcwele. U-Gu ngokuvamile ubiza isilawuli sohlobo oluvulekile lwegesi lwenkinga yokuvala uhlobo lwevalvu.
Uhlobo lokuvala igesi (uhlobo oluvame ukuvuleka) umumo wokusebenza kanye nohlobo oluvulekile lwegesi luhlehla nje. Lapho umfutho wegesi ukhuphuka, i-valve yokuvala isikhundla; Lapho ukucindezela kwegesi kuncishisiwe noma cha, i-valve kufanele ivulwe endaweni evulekile noma ivuleke. Ngokuvamile, sibiza isilawuli sohlobo oluvaliwe lwegesi oluvulekile lwe-valve yokwehluleka okuvamile.
Ukukhethwa kokuvula nokuvala igesi kusekelwe ekuphepheni kwenqubo yokukhiqiza. Lapho umthombo womoya unqanyuliwe, i-valve elawulayo iyingxenye evaliwe yokuphepha noma ingxenye evulekile yokuphepha.
Isibonelo, isilawuli sokushiswa kwesithando sokushisa ukushisa, i-valve elawulayo efakwe epayipini legesi likaphethiloli, ngokuya ngezinga lokushisa esithandweni noma izinga lokushisa lezinto ezishisiwe endaweni yokungena nokuphuma kwesithando sokushisa ukuze kulungiswe izinto. ukunikezwa kwemakethe. Ngalesi sikhathi, isici sokuphepha se-valve yokuvula igesi kufanele sikhethwe, ngoba uma umthombo wegesi usuphelile, i-valve ivaliwe kunokuba i-valve ivuliwe. Uma umthombo womoya ekugcineni uphukile futhi i-valve yamandla ivuliwe, izovumela ukushisa okudlulele ukuba kwenzeke. Futhi njengesiqandisi semishini eshisayo enamanzi ajikelezayo okupholisa, impahla eshisayo emshinini wokushisa kanye nokupholisa isishintshi sokushisa samanzi esijikelezayo sifakwe esiqandisini, i-valve elawulayo ifakwe epayipini lokupholisa, ngokushisa kwempahla yokushintshanisa ukushisa ukulawula ukugeleza kwamanzi apholisayo. , ekugcineni komthombo womoya, i-valve elawulayo kufanele ibe sesimweni sesici sokuphepha esiphezulu, kufanele ikhethe ukusebenzisa uhlobo lwe-gas close (FO) lokulawula i-valve.
◆◆ ◆
Izikhundla zamavalvu
I-valve positioner iyingxenye ebalulekile ye-valve yokulawula, ene-valve yokulawula umoya, ithola isignali ye-pulse yesilawuli, kanye nesignali yayo yokushaya ukulawula i-valve yokulawula umoya, lapho indawo yokulawula i-valve, i-stem offset nayo ngokusebenzisa i-electronic. impendulo yedivayisi endaweni ye-valve, indawo ye-valve ngokusho kwesignali kagesi ethunyelwe kusofthiwe yesistimu yesiteji. I-valve positioner ngokuya ngesakhiwo sayo kanye nomgomo ingahlukaniswa ibe indawo ye-valve ye-pneumatic, i-valve-gas positioner positioner i-valve positioner ehlakaniphile.
I-valve positioner inganweba amandla e-valve elawulayo, inciphise ukudluliswa kwamandla kwesiginali yokulungisa, isheshise isivinini se-valve stem, ithuthukise i-valve ewumugqa, isuse ukungqubuzana kwesiqu se-valve futhi isuse ithonya elingalingani. amandla, uqinisekise ngokugcwele ukuma okulungile nokunembile kwe-valve elawulayo.
I-actuator ye-pneumatic, i-actuator kagesi, ukuhlela uhambo oluqondile, umehluko wokuhlelwa kohambo lwe-Engle. Isetshenziselwa ukuvulwa okuzenzakalelayo kanye nokwenza ngesandla nokuvala zonke izinhlobo zeminyango, abalandeli, njll.
Izinga lokuhlanganisa lamavalvu okulawula umoya
(1) ukufakwa kwe-valve yokulawula umoya, kukhona ukuphakama okuthile kwesihlobo kusuka phansi, i-valve yokushiya indawo ethile, kulula ukwenza ukuhlakazeka nokugcinwa kwe-valve. Ukuze uthole ama-valve alawulayo afakwe i-pneumatic valve positioner kanye ne-spindle, kuyadingeka ukuqinisekisa ukusebenza okungokoqobo, ukubhekwa ngokucophelela kanye nokulungiswa okulula.
(2) Ivalvu elawulayo kufanele isethwe epayipini lokulinganisa, kanye nepayipi elijikelezayo nelime mpo, ngokuvamile ngaphansi kwevalvu ukuze liyisekele, ukuze kuqinisekiswe ukuthi lithembeke ngokuqinile. Ezikhathini eziyingqayizivele, kuyadingeka ukufaka izinga le-valve epayipini eliqondile endaweni ethile, kufanele futhi kube i-valve yokulawula yokuqala yokufeza iphuzu lokusekela (ngaphandle kobubanzi be-valve). Ukufakwa, kumele kugweme ukucindezeleka okwengeziwe ku-valve elawulayo).
(3) Izinga lokushisa elisebenzayo levalvu elawulayo lidinga ukuba ku (-30 ~ 60) umswakama womoya akumele udlule u-95%95%, umswakama womoya akumele udlule u-95%.
40 ukuze kuthinte i-coefficient yokugeleza.
(5) Uma imininingwane yevalvu elawulayo kanye nepayipi lenqubo kuhlukile, ipayipi lokunciphisa elingenasici kufanele lisetshenziswe ukuxhuma. Ekufakweni kwe-valve ye-caliber, ungasebenzisa uxhumano lwe-flange. Uketshezi olubonisa umcibisholo ebhodini lesifunda samafutha kufanele libe ohlangothini olufanayo nolwe-liquid.
(6) Ukusetha ipayipi lokudlula. Inhloso ukwenza lula ukuguqulwa noma ukulawula okwenziwa ngesandla ngaphandle kokugcinwa kwesilawuli esimweni sokupaka.
(7) Ivalvu yokulawula epayipini ngaphambi kokwakhiwa kwezinto ezingcolile eziphelele, njengamabala, izibazi zokushisela, njll.
Izinkinga ezivamile nezisombululo
Umlawuli akekho esimweni
Okokuqala thola ukuthi ingabe kunenkinga ngokucindezela kokusebenza komthombo womoya, sesha amaphutha avamile omthombo womoya. Uma ingcindezi yokusebenza yomthombo womoya ijwayelekile, hlukanisa ukuthi ngabe isifunda se-amplifier sendawo noma isiguquli sikagesi/igesi sitholwa; Uma kungekho ukuthekelisa, imbobo ye-throttle ye-amplifier njalo ivinjiwe, noma ukugxila komoya ku-valve yesango le-amplifier kuyancipha. Sebenzisa ucingo olucijile ukuze uphakele ngembobo edonsa umoya, uchithe noma uhlanze umthombo womoya.
Uma okungenhla kuvamile, akukho ukuma uma kunesignali yedatha, khona-ke i-actuator ngokuvamile inephutha noma isiqu se-valve sigobile, noma i-valve core ibambekile. Kulokhu, qiniseka ukuthi ususa i-valve ukuze uhlolwe okwengeziwe.
I-valve yokulawula ibambekile
Uma ukuhlelwa kwe-stroke okuphindaphindayo kokuma kwesiqu se-valve kuhamba kancane, umzimba we-valve noma amakhemikhali e-viscous kakhudlwana, isivimbo sokukala noma into yokugcwalisa ecindezelwe yaqina, noma ukuguga kwe-PTFE yokugcwalisa, ukuklwebheka kwesiqu. Iningi lezinkinga ze-valve jam yokulawula zenzeka ekusetshenzisweni okusha kwesoftware nokugcinwa esimweni sokuqala, ngoba esibazini sokushisela ipayipi, ukugqwala embobeni ye-throttle valve kanye nesikhundla sokuqhuba kuholela ekuvimbeni ukuze ukugeleza kwempahla kuvimbe, noma izinto zokugcwalisa ukulungiswa kwe-valve ziqine kakhulu, okuholela ekwandeni kokungqubuzana kokuslayida, okuholela ekumeni kwesignali encane, ukuma kwesignali yedatha enkulu ngokweqile.
Ezimweni ezinjalo, ungakwazi ukuvula ngokushesha futhi uvale umugqa osizayo kufanele ulawule i-valve, ukuze udoti ovela kulayini osizayo kufanele uqhutshwe yizinto ezibonakalayo. Ngaphezu kwalokho, i-clamp yepayipi ingasetshenziswa futhi ukubamba isiqu se-valve, ngaphezu kwesignali yedatha yesimo sokucindezela kokusebenza, amandla anezinhlangothi ezimbili ukuzungezisa isiqu se-valve, ukuze umgogodla we-valve ukhanye ngaphandle kwekhadi. Uma ungakwazi ukubhekana nenkinga, ungakwazi ukwandisa umfutho osebenzayo womthombo womoya futhi ukhuphule amandla okushayela ukuze wehle uphinde uhle izikhathi ezimbalwa. Khona-ke ungakwazi ukubhekana nenkinga. Uma isengakwazi ukuma, kuyadingeka ukuhlakaza i-valve elawula ukucindezela. Ngokwemvelo, lo msebenzi udinga ikhono eliqinile lochwepheshe futhi kufanele wenziwe ngosizo lobuchwepheshe bezobuchwepheshe, ngaphandle kwalokho imiphumela emibi iyingozi kakhulu.
Isikhathi sokuthumela: Apr-25-2023
