Ingcoco yelwati lwevalve yeluvivane

Ngabo 30s, iivalvu yevivaneyasungulwa eMelika, yetfulwa eJapan ngemnyaka wa 50s, futsi yasetjentiswa kakhulu eJapan ngemnyaka wa 60s, futsi yakhutsatwa eChina ngemuva kweminyaka yabo 70s. Kwanyalo, emavalvu ebutterfly langetulu kwe DN300 mm emhlabeni wonkhe kancane kancane atsatse sikhundla semavalvu esango. Nakucatsaniswa neemavalvu esango, emavalvu e-butterfly anesikhatsi lesifishane sekuvula nekuvala, i-torque lencane yekusebenta, sikhala lesincane sekufaka kanye nesisindvo lesilula. Kutsatsa DN1000 njengesibonelo, ivalve ye butterfly ingaba ngu 2T, bese ivalve yesango ingaba ngu 3.5T, futsi ivalve ye butterfly kulula kuyihlanganisa netintfo letehlukene tekushayela, ngekuciniseka lokuhle kanye nekwetsembeka.

Lokungakalungi kwesivalo serabhaivalvu yevivanekutsi uma isetjentiselwa throttling, cavitation kutawenteka ngenca yekusetjentiswa lokungakafaneli, lokutawenta kutsi situlo serabha sikhukhuleke bese silimala. Eminyakeni yamuva, iChina iphindze yakha emavalvu evivane lavalwe ngensimbi, futsi eminyakeni yamuva, iJapan iphindze yakha emavalvu evivane lamise njengeliklamo ngekumelana ne cavitation, kudvudvuta lokuphansi kanye nemsindvo lophansi.

Impilo yekusebenta yesihlalo sekuvala jikelele iminyaka lengu 15-20 yenjoloba kanye neminyaka lengu 80-90 yensimbi ngaphansi kwetimo letivamile. Nobe kunjalo, indlela yekukhetsa kahle incike etidzingo tetimo tekusebenta.

Budlelwane emkhatsini wekuvulwa kwe .ivalvu yevivanefutsi lizinga lekugeleza ngalokuyinhloko lisemgceni futsi lilingana. Uma isetjentiselwa kulawula lizinga lekugeleza, timphawu tayo tekugeleza tiphindze tihlobane kakhulu nekumelana nekugeleza kwemaphayiphi, njengebubanti kanye nesimo semavalvu lafakwe kulamaphayiphi lamabili ayafana, futsi i-coefficient yekulahlekelwa kwemaphayiphi yehlukile, futsi lizinga lekugeleta kwevalve litawuhluka kakhulu.

Uma le valve isesimeni sekucindzetela lokukhulu, ngemuva kwepuleti le valve kuthambekele ku cavitation, futsi kunematfuba ekulimata le valve, ngako-ke ivame kusetjentiswa ngaphandle kwa 15°.

Uma i-valve ye-butterfly isekuvuleni lokusemkhatsini, kwakheka kwekuvulwa lokwakhiwa yi-ivalvuumtimba kanye nekuphela kwembili kwepuleti levivane kugcile eshaft yevalve, futsi letinhlangotsi letimbili takha imibuso leyehlukene, umkhawulo wangaphambili wepuleti levivane ngakulolunye luhlangotsi uhamba ngendlela yemanti lageleta ngayo, bese lolunye luhlangotsi luhamba luphikisana nendlela emanti lageletako, ngako-ke, umtimba wevalve loshape ngakulolunye luhlangotsi kanye ne-valve pla- side, kufana nekuvulwa lokumise imbobo ye-throttle, luhlangotsi lwe-nozzle lushesha kakhulu kuneluhlangotsi lwe-throttle, futsi umfutfo lomubi utawukhicitwa ngaphansi kwevalve yeluhlangotsi lwe-throttle, futsi luhlangotsi lwerabha luvame kuwa.

I-torque lesebentako ye-valve ye-butterfly, ngenca yekuvula lokuhlukile kanye nekuvula kwe-valve, linani layo lehlukile, futsi i-valve ye-butterfly levundlile, ikakhulukati i-valve lenebubanti lobukhulu, ngenca yekujula kwemanti, i-torque lekhicitwa ngumehluko emkhatsini wenhloko lengetulu nalephansi ye-valve shaft angeke inganakwa. Ngetulu kwaloko, uma kufakwa ingcosa eceleni kwekungena kwevalve, kwakheka kugeleta kwekuphambuka, bese i-torque iyakhula. Uma ivalve isekuvuleni lokusemkhatsini, indlela yekusebenta idzinga kutikhiya ngenca yesento se-torque yekugeleta kwemanti.