Umehluko ekwakhiweni kwevalvu yevemvane uhlukanisa izinhlobo ezine zamavalvu evemvane, okungukuthi:ivalvu yebhabhathane eliyindilinga, ivalvu eyodwa yebhabhathane engavamile,ivalvu yebhabhathane ephindwe kabilikanye nevalvu yebhabhathane engavamile kathathu. Uyini umqondo walokhu kungavamile? Unganquma kanjani ukuthi uzoyisebenzisa nini ivalvu yebhabhathane egxilile, uzoyisebenzisa nini ivalvu yebhabhathane eyodwa engavamile, uzoyisebenzisa nini ivalvu yebhabhathane engavamile kathathu kanye nevalvu yebhabhathane engavamile kathathu? Abasebenzisi abaningi abacaci kahle. Ake sifunde ndawonye.
Amavalvu ebhabhathane aqinile, amavalvu ebhabhathane elilodwa elingavamile, aphindwe kabiliamavalvu ebhabhathane angavamilekanye nama-valve e-butterfly angavamile kathathu empeleni abonisa inqubo yokuvula nokuvala ngomzamo omncane nokuguga okuncane ebusweni bokuvala. Ngokubeka indawo yomgodi ojikelezayo wepuleti le-valve ye-butterfly, izimo zokuvala nokuvula ze-valve ye-butterfly zingashintshwa. Ngaphansi kwezimo ezifanayo, i-torque ye-valve lapho ivulwa iyanda ngokulandelana. Lapho i-valve ivulwa, i-engeli yokujikeleza edingekayo ukuze ipuleti le-valve lihlukane ne-seal incane ngokulandelana.
Isici sokwakheka kwevalvu yebhabhathane eqondile ukuthi isikhungo somgodi wesiqu sevalvu, isikhungo seplate yebhabhathane kanye nesikhungo somzimba wevalvu kusendaweni efanayo. Ngokuvamile, uma amavalvu ebhabhathane aqondile angasetshenziswa, kufanele asetshenziswe ngangokunokwenzeka. Ngenxa yokuthi uhlobo oluqondile aludingi ukusebenza okuphezulu kokuvala ngokwesakhiwo noma ukusebenza, luwumkhiqizo ojwayelekile. Ukuze kunqotshwe ukukhishwa, ukuklwebheka, nokuqinisekisa ukusebenza kokuvala, isihlalo sevalvu sevalvu yebhabhathane eqondile senziwe ngerabha noma i-PTFE kanye nezinye izinto ezinwebekayo, okuyivalvu yebhabhathane ethambile yokuvala. Lokhu kwenza ukusetshenziswa kwamavalvu ebhabhathane aqondile kuncike ekulinganiselweni kokushisa. Ukuze kuxazululwe inkinga yokukhishwa kweplate yebhabhathane kanye nesihlalo sevalvu, kwasungulwa ivalvu yebhabhathane eyodwa engavamile. Isici sayo sokwakheka ukuthi isikhungo somgodi wesiqu sevalvu siphambuka enkabeni yeplate yebhabhathane.
Ivalvu yebhabhathane ephindwe kabili iyona esetshenziswa kakhulu. Isici sayo sokwakheka ukuthi isikhungo somshafu wesiqu sevalvu siyaphambuka enkabeni yeplate yebhabhathane kanye nesikhungo somzimba wevalvu. Siyaphambuka ezikhundleni ezimbili eziphakathi, ngakho-ke sibizwa ngokuthi ivalvu yebhabhathane ephindwe kabili. Eziningi zazo zivaliwe ngomugqa. Lapho indawo yokuvala ivaliwe, kuba nokungqubuzana phakathi kweplate yediski nesihlalo sevalvu, futhi umphumela wokuvala muhle kakhulu. Inezici zendawo encane kanye nokucindezela okunamandla. Ngemva kokuba ivalvu ivuliwe, iplate yebhabhathane ingaphuma ngokushesha esihlalweni sevalvu, okususa kakhulu ukuphuma ngokweqile okungadingekile kanye nokuklwebheka phakathi kweplate nesihlalo, kunciphisa ibanga lokumelana nokuvulwa, ukuguguleka, futhi kuthuthukise impilo yenkonzo yesihlalo sevalvu.
I-valve ye-butterfly eccentric kathathu ine-eccentric yesithathu ngokusekelwe ku-valve ye-butterfly eccentric ephindwe kabili. Ukuma kwe-sealing pair akuyona i-cone enhle, kodwa i-cone e-oblique. Iningi lazo liyi-force yebanga elifushane kanye ne-surface seal. I-stem shaft ye-triple eccentric butterfly valve iyisakhiwo se-shaft esinezigaba ezintathu. Izingxenye ezimbili ze-shaft ze-three-section shaft valve stem ziyi-concentric, futhi umugqa ophakathi we-central section shaft uphambuka ku-axis yezinhlangothi ezimbili ngebanga eliphakathi, futhi i-butterfly plate ifakwe phakathi. ku-shaft. Isakhiwo esinjalo esiccentric senza i-butterfly plate ibe nesimo esiccentric kabili uma ivuliwe ngokuphelele, kanye nesimo esisodwa esiccentric lapho i-butterfly plate iphendukela endaweni evaliwe. Ngenxa yomphumela we-shaft eccentric, uma iseduze nokuvala, i-butterfly plate ihambisa ibanga endaweni ye-sealing cone yesihlalo se-valve, futhi i-butterfly plate ifanelana nendawo yokuvala yesihlalo se-valve ukuze kufezwe ukusebenza okuthembekile kokuvala. Kuhlanganisa ukuphikisana kokuthi i-hard seal ine-seal embi, futhi i-soft seal inomphumela omuhle wokuvala kodwa ayimelani nokushisa okuphezulu.
Isikhathi sokusebenzisa ivalvu yebhabhathane eqondile, isikhathi sokukhetha ivalvu yebhabhathane eqondile ephindwe kabili noma ivalvu yebhabhathane eqondile ephindwe kathathu, kuncike kakhulu ezimweni zokusebenza kanye nesabelomali.
Isikhathi sokuthunyelwe: Novemba-28-2022