Ingqalelo ekukhethweni okuchanekileyo kweevalvu kwiinkqubo zemibhobho yokwakha - Isikhokelo sokukhethwa kweendawo eziphambili zevalve kwindawo yolawulo
Kwimibhobho yokwakha, iivalvu zidlala indima yokulawula ulwelo. Ngenxa yesakhiwo esahlukileyo kunye nezinto eziphathekayo, ngoko ke iivalve ezenziweyo azifani. Ukuze kuqinisekiswe ukuba inkqubo yombhobho inokufezekisa ukusebenza okuphezulu, ixabiso eliphantsi kunye nobomi benkonzo ende, ukhetho oluchanekileyo lweevalvu lubaluleke kakhulu.
Ivalve inemisebenzi emine ephambili: qala kwaye umise ukuhamba kwemidiya; Lungisa ukuhamba okuphakathi; Ikhusela umva okanye i-reflux kwaye ilawula okanye ikhulula uxinzelelo lolwelo. Ukukhethwa kwenkqubo yokwakhiwa kwemibhobho kunokuqwalaselwa ngokweqondo lokushisa, uhlobo oluphakathi, ubushushu kunye nezinye izinto. , umzekelo, kwisakhiwo esiphezulu se-valve yokulawula i-valve yomlilo kufuneka isetyenziswe isignali, oku kuhambelana nokuba ingaba inkqubo yokucima umlilo iyisitshixo sokusetyenziswa okunengqiqo, xa i-valve yolawulo lwenkqubo yomlilo imiselwe ivalve yomqondiso, kwaye ivalve evulekileyo ukubonisa embindini wolawulo lomlilo, ukwenzela ukuba kube lula uhlolo lolawulo, nangona ixabiso liye landa, nangona kunjalo, umlinganiselo wotyalo-mali kwinkqubo ye-hydrant jikelele usemncinci kakhulu, kwaye unokwenza ukhuseleko lulonke. inkqubo ye-hydrant, exabisa utyalo-mali.
Uhlobo lwevalve ESETYENZISIWEYO kwisixokelelwano sombhobho wokwakha kufuneka sikhethwe ngokweempawu zesakhiwo. Ukuba ivalve esetyenzisiweyo ayifanelekanga kwiimpawu zoyilo lwesakhiwo, inani leengozi ezinokubakho ziya kuvela rhoqo.
Ukukhethwa kwendawo yokubeka ivalve kuya kuchaphazela ngokuthe ngqo ukusebenza kunye nomgangatho wevalve yokulawula kunye nenkqubo yokulawula. Ke indlela yokukhetha i-valve positioner ngokuchanekileyo nangengqiqo ibaluleke kakhulu kwindawo yolawulo. Amagama angundoqo: Isikhokelo sokhetho lwevalve kwizicelo ezininzi zolawulo, indawo yokubeka ivalve yenye yezona zincedisi zibalulekileyo. Kwisicelo esithile, ukuba ufuna ukukhetha indawo efanelekileyo (okanye elungileyo) yevalve, kufuneka uqwalasele le miba ilandelayo: 1) Ingaba indawo yokukhangela ivalve “ingahlula-hlukana”? Ngaba kulula kwaye kulula ukuphumeza "ukwahlula"? Ukuba nomsebenzi "wokwahlula" kuthetha ukuba isimiseli sevalvu siphendula kuphela kuluhlu lwemiqondiso yokufaka (umzekelo, i-4 ukuya kwi-12mA okanye i-0.02 ukuya kwi-0.06MPaG). Ngoko ke, ukuba unako "ukwahlula", unako ngokweemfuno zangempela, isignali eyodwa kuphela yokufaka ukuphumeza ukulawulwa kwee-valve ezimbini okanye ngaphezulu zokulawula. 2) Ngaba ukulungiswa kwendawo ye-zero kunye noluhlu lulula kwaye lufanelekile? Ngaba kunokwenzeka ukulungisa i-zero kunye noluhlu ngaphandle kokuvula isiciko? Nangona kunjalo, kubalulekile ukuqaphela ukuba ngamanye amaxesha ulungelelwaniso olunjalo lufuna ukuthintelwa ukuze kuthintelwe imisebenzi engalunganga (okanye engekho mthethweni). 3) Yintoni ukuzinza kwe-zero kunye noluhlu? Ukuba i-ZERO KUNYE NE-RANGE ZIQHELEKILE UKUQHUBEKA NOKUTSHINTSHA OKUTSHINTSHA, UKUGUQUKA, IXESHA, OKANYE UXINEZELEKO LOKUFUMANA, I-valve POSITIONER KUYA KUFUNA UKUBUYISWA RHOQO UKUQINISEKISA UKUHAMBA OKUCHANILEYO KWE-REGULATOR. 4) Sichane kangakanani isimiseli sevalvu? Ngokufanelekileyo, kwisignali yegalelo, iiNdawo ze-Trim zevalve (i-Trim Parts, kubandakanywa i-spool, i-stem, isihlalo sevalve, njl. njl.) ixesha ngalinye kufuneka libekwe ngokuchanekileyo kwindawo efunekayo, kungakhathaliseki indlela yokuhamba okanye ivalve elawulayo. umthwalo omninzi wamalungu angaphakathi. 5) Yintoni imfuneko yomgangatho womoya wevalvu yendawo? Njengoko kuphela inani elincinane kakhulu leeyunithi zobonelelo lomoya ezinokubonelelwa ukuhlangabezana nemigangatho ye-ISA (imigangatho yomgangatho womoya wesixhobo: ISA UMGANGATHO F7.3) WOKUSEMOYA, NGOKO, KWI-AIR-MOBILIZED OKANYE ELECTRIC-GAS (VALVE) POSITIONERS, UKUBA KUFANELE UKUMELANA NEEMEKO ZOKWENENE-ZEHLABATHI, KUFUNEKA BAKWAZI UKUMELANA ISIXA ESITHILE SOTHUTHI, UKUFUMUKA NEOLI. 6) Ngaba ukulinganiswa kwe-zero kunye noluhlu luchaphazela omnye nomnye okanye ngaba zizimeleyo? Ukuba zichaphazela omnye nomnye, ii-zero kunye noluhlu luthatha ixesha elingakumbi lokulungelelanisa, kuba i-tuner kufuneka ihlengahlengise ngokuphindaphindiweyo ezi parameters zimbini ukufikelela ngokuthe ngcembe kwisetingi ngqo. I-7) Ngaba i-valve positioner ixhotyiswe "nge-Bypass" evumela ukuba uphawu lokufaka lusebenze ngokuthe ngqo kumlawuli? Le “bypass” ngamanye amaxesha inokwenza lula okanye ilushiye ulungelelwaniso lweSeto lwe-Actuator, olufana noku: “Ukuseta ibhentshithi” kunye “nesetingi yomthwalo weSitulo” ye actuator — oku kungenxa yokuba kwiimeko ezininzi, isignali yemveliso ye-aerodynamic yezinye izilawuli zomoya ziyahambelana. “Iseti yesihlalo” se actuator ngokuchanekileyo ukuze kungabikho cwangciso lulolunye lufunekayo (eneneni, kulo mzekelo, izimiseli zeValve zinokushenxiswa ngokupheleleyo. Umqondiso we-pneumatic output we-pneumatic regulator ngqo kwi-regulator). I-ADDITION, kunye "ne-bypass" ngamanye amaxesha inokuvumela ukulungiswa okulinganiselwe okanye ukugcinwa kwe-valve positioner kwi-intanethi (oko kukuthi, ukusetyenziswa kwe-valve positioner "bypass" ukwenzela ukuba umlawuli aqhubeke nokugcina umsebenzi oqhelekileyo, ngaphandle kokunyanzelisa umlawuli ngaphandle kwe-intanethi. ). 8) Ingaba umsebenzi wevalve positioner ukhawuleza? Ukuhamba komoya Ukuhamba komoya okukhulu (indawo yevalve isoloko ithelekisa isignali yegalelo kunye nenqanaba levalve kwaye ihlengahlengise imveliso yayo ngokomahluko. Ukuba i-valve positioner iphendula ngokukhawuleza kolu kunxaxha, ke ukuhamba komoya okuninzi ngexesha leyunithi), ngokukhawuleza uhlengahlengiso. inkqubo IYAPHENDULA kwi-Setpoint kunye nokuhluka komthwalo - oku kuthetha impazamo yenkqubo encinci (i-lag) kunye nomgangatho ongcono wokulawula. 9) Iimpawu zeFrequency ye-valve positioner (okanye i-Frequency Response, Frequency Response — G (jω), yintoni impendulo ezinzileyo yenkqubo kwigalelo le-sinusoidal? Ukuphakama kobuntununtunu kwimpendulo yefrikhwensi), kokukhona ukusebenza kolawulo kubhetele, kufuneka kuqatshelwe ukuba iimpawu zokuphindaphinda kufuneka zigqitywe ziiNdlela zoVavanyo eziQhubelekayo kuneendlela zethiyori, kwaye isibekeli-valve kunye ne-actuator kufuneka ziqwalaselwe kunye xa kuvavanywa ukuphindaphindwa. Iimpawu. Umzekelo, ezinye izibonisi zevalvu zinoxinzelelo olukhulu lonikezelo lomoya oluyi-501b/in kuphela (okt 50psi, lpsi =0.07kgf/cm ≈ 6.865kpa), indawo yokubeka ivalve iba ngumqobo kwi-actuator output thrust ukuba i actuator ithelekelwe ukusebenza. kuxinzelelo oluphezulu kune-501b/in. 11) Xa ivalve elawulayo kunye nesibekeli-valve zidityanisiwe kwaye zidityanisiwe, kuthekani ngeSigqibo seSimo sabo? Oku kunempembelelo ecacileyo kakhulu kumgangatho wolawulo lwenkqubo yokulawula, kuba ukuphakama kwesisombululo, ngokusondeleyo ukubekwa kwevalve elawulayo kwixabiso elifanelekileyo, kwaye utshintsho oluguquguqukayo olubangelwa Ukugqithisa kwevalve elawulayo kunokulawulwa, ukuze kuthintelwe utshintsho lwamaxesha athile kwisixa esilawulwayo. 12) Ingaba uguqulo olulungileyo nolungalunganga lwesimiseli sevalvu luyenzeka? Ngaba inguqu ilula? Ngamanye amaxesha olu phawu luyimfuneko. UMZEKELO, UKUTSHINTSHA "ISIGNAL I-VALVE-VALVE CLOSE" imowudi “EKUVULAYO OKUMQONDISO OKUVULEKILEYO”, UNGASEBENZISA I-VALVE POSItioner's positive AND NEGATIVE CONVERSION umsebenzi. 13) Kunzima kangakanani ukusebenza kwangaphakathi kunye nokugcinwa kwe-valve positioner? Njengoko sonke sisazi, iindawo ezininzi, kokukhona kuntsonkothe ngakumbi ubume bokusebenza kwangaphakathi, kokukhona uqeqesho lokulungisa (ukulungisa) abasebenzi, kunye neendawo ezisecaleni kwisitokhwe. 14) Yintoni i-Stady-state Air Consumption yesibonisi sevalvu? Kolunye ufakelo lweplanti, le parameter ibalulekile kwaye inokuba ngumba osisithintelo. 15) Ewe, ezinye izinto kufuneka ziqwalaselwe xa kuvavanywa kwaye kukhethwa izimiseli zevalvu. Umzekelo, iNxulumano yeNgxelo yesibekeli-valve kufuneka ibonise indawo yespool; Ukongeza, i-valve positioner kufuneka yomelele kwaye yomelele, ibe nokhuseleko lokusingqongileyo kunye nokumelana ne-corrosion, kwaye kulula ukuyifaka kunye nokudibanisa.
Ixesha lokuposa: Oct-13-2022
