Kungani ama-valve ebhola engavulwa futhi avalwe ngokushesha?

Isizathu sokuthi kunganiama-valve ebholabangafinyelela ukuvuleka okusheshayo nokuvala amanga esakhiweni sabo esiyingqayizivele semishini kanye nomklamo we-fluid dynamics. Ingxenye yokuvula neyokuvala iyindilinga enembobo eyisiyingi, engaqhutshwa isiqu se-valve ukuze ijikelezise amadigri angama-90 eksisini yayo ukuze iqedele ukushintshwa kombuso - lapho imbobo edlulayo yendilinga iqondaniswe ne-eksisi yepayipi, i-valve ivuleka ngokugcwele; Ngemuva kokuzungezisa amadigri angama-90, imbobo yokudlula ibheke epayipini futhi ivalvu ivalwe ngokuphelele. Lo mklamo we-"quarter turn" wenza lula ukuvuleka nokuvala isenzo sibe ukunyakaza okujikelezayo ngaphakathi kwendiza eyodwa, kufinyeze kakhulu indlela yokusebenza.

Ngokombono wesakhiwo semishini, ibhola le-i-valve yebholaithatha indlela "yokuthintana naye" noma "yokuxhumana okungaphezulu" ngesihlalo sevalvu. Ukuthatha i-valve yebhola elintantayo njengesibonelo, ibhola lizoya esihlalweni se-valve yokuphuma ngaphansi kwengcindezi ye-medium, lenze i-self tight seal futhi linciphise ukumelana nokungqubuzana ngesikhathi sokuvula nokuvala; I-valve yebhola engaguquki isekelwa ama-bearings weziqu ze-valve ezingenhla neziphansi, ukuze ibhola lidinga kuphela ukunqoba amandla amancane aphikisanayo phakathi kwesihlalo se-valve nebhola lapho lijikeleza. Lo mklamo wenza i-sphere icishe ingathinteki ukumelana noketshezi ngesikhathi sokuzungezisa, ifaneleke ikakhulukazi izimo zokucindezela okukhulu. Isibonelo, embonini ye-petrochemical, ama-valve ebhola womoya we-DN300 angaqeda ukuvula nokuvala ngemizuzwana engu-0.5, ngokushesha kakhulu kunamavalvu esango noma ama-valve eglobhu adinga ukuzungezisa okuningi.

Izici ze-fluid dynamics zithuthukisa amandla okuphendula okusheshayo kwe-i-valve yebhola. Ishaneli yokugeleza yevalve yebhola egcwele ibhore ihambisana ngokuphelele nobubanzi bangaphakathi bepayipi, futhi cishe akukho ukwehla kwengcindezi lapho uketshezi ludlula. Ngeke kube khona ukumelana okwengeziwe ngenxa ye-inertia ye-medium ngesikhathi sokuvula nokuvala. Ngokuphambene, i-disc ye-butterfly valve ingase ivimbele ezinye zeziteshi zokugeleza ngesikhathi sokujikeleza, okubangela ukuthi uketshezi lusebenzise i-reverse thrust ku-disc futhi luthinte isivinini sokuvula nokuvala; Isango le-valve yesango lidinga ukuphakanyiswa futhi lihlehliswe, nge-stroke ende futhi lithinteka kalula yi-viscosity ye-medium. Idatha yokuhlola ibonisa ukuthi kumapayipi e-DN200, isikhathi sokuvula nokuvala ama-valve ebhola sifushane ngo-40% kunaleso se-butterfly esicaciswe okufanayo futhi sifushane ngo-70% kunesamavalvu esango.

Ngaphezu kwalokho, indlela yokushayela ye-valve yebhola iphinde inikeze ukwesekwa kokuvula nokuvala kwayo ngokushesha. I-pneumatic, kagesi, noma i-hydraulic actuators ingakhipha i-torque ephezulu ngokushesha, ishayele indawo ukuze iqedele ukujikeleza okungu-90 degree phakathi kwamasekhondi angu-0.1. Isibonelo, ohlelweni oluphuthumayo lokuvala igesi yemvelo, i-valve yebhola yomoya inganqamula ukugeleza komoya phakathi nemizuzwana engu-0.3 ngokuthola amasignali kagesi, ivimbele ngokuphumelelayo izingozi ukuthi zingabhebhetheki. Leli khono lokuphendula elithi "izinga le-millisecond" alifaniswe namavalvu enziwe ngesandla.