keng 30s, ingbalbula ning parulme-imbentu ya keng United States, mipakilala ya keng Japan kanitang dekadang 50, at maralas yang megamit keng Japan kanitang dekadang 60, at mipalabung ya keng Tsina kaybat ning dekadang 70. Ngeni, deng butterfly valves a maygit DN300 mm keng yatu bagya-bagya lang mipalitan kareng gate valves. Kumpara kenggate valves, deng butterfly valves atin lang makuyad a oras ning pamagbukas ampo pamagsara, malating operating torque, malating espasyu para keng pamag-install ampo magaan a timbang. Ing DN1000 bilang alimbawa, ing butterfly valve mga 2T ya, ampo ing gate valve mga 3.5T ya, ampo ing butterfly valve madali yang isamut kareng miyayaliwang driving devices, a maki masanting a durability ampo reliability.
Ing disbentaha ning rubber sealbalbula ning parulnung gamitan ya para keng throttling, ing cavitation malyari ya pauli ning e ustu pamangamit, na maging sangkan ning pangabalat ning rubber seat at pangasira. kareng milabas a banua, ing china ginawa ya namang metal sealed butterfly valves, ampo keng milabas a banua, ing japan ginawa yang comb-shaped butterfly valves a maki cavitation resistance, mababang vibration ampo mababa ing ingay.
Ing service life ning general sealing seat 15-20 banua ya para keng goma ampo 80-90 banua para keng metal keng normal a kundisyun. Makanyan man, nung makananu yang mamili ing ustu dependi ya keng requirements ning obra.
Ing relasyun ning pamamuklat ning metung abalbula ning parulat ing flow rate linear ya at proportional. nung gamitan ya para makontrol ing flow rate, ing kayang flow characteristics malapit ya keng flow resistance ning piping, antimo ing diametru ampo ing porma da reng valve a maka-install kareng adwang pipeline parehu la, ampo ing pipeline loss coefficient miyayaliwa ya, ampo ing flow rate ning valve miyayaliwa ya.
nung ing valve atyu ya keng maragul a throttling, ing gulut ning valve plate prone ya keng cavitation, ampo atin yang posibilidad na masira ya ing valve, inya keraklan gagamitan de keng kilwal ning 15°.
nung ing butterfly valve atyu ya keng libutad ning pasbul, ing pasbul a porma a gewa ningbalbulakatawan ampo ing arap ning butterfly plate makasentru ya keng valve shaft, ampo deng adwang gilid mika miyayaliwang kabilian, ing arap ning butterfly plate keng metung a gilid kikimut ya keng direksyun ning mamagus a danum, inya sa't, ing katawan ning balbula keng metung a gilid ampo ing valve plate alang bubuu a balbula, at mekad makabuklat ya ing aliwang gilid throttle hole-shaped opening, ing nozzle side mas mabilis ya kesa keng throttle side, at ing negative pressure magawa ya keng lalam ning throttle side valve, ampo ing rubber seal maralas yang mangabagsak.
Ing operating torque ning butterfly valve, pauli ning miyayaliwang direksyun ning pamagbukas ampo pamagbukas ning balbula, miyayaliwa ya ing ulaga na, ampo ing horizontal butterfly valve, lalu na ing maragul a diametru, pauli ning kalalam ning danum, ing torque a gagawan ning pamiyaliwa ning babo ampo lalam ning buntuk ning valve shaft e malyaring e pansinan. Dagdag pa, nung ing siko makabili ya keng inlet side ning valve, mika deflection flow, at daragul ya ing torque. Nung ing balbula atyu ya keng libutad ning pasbul, ing operating mechanism kailangan yang mag-self-locking pauli ning aksyon ning torque ning danum.
Oras ning pamagpost: Aug-22-2024
