Valve ya phaphatanii muxaka wa valve leyi tirhisaka xiphemu xo pfula na ku pfala disc ku reciprocate kwalomu ka 90° ku pfula, ku pfala kumbe ku lulamisa mpimo wa ku khuluka ka medium. Valve ya phaphatani ayi na xivumbeko xo olova ntsena, vukulu lebyintsongo, ntiko wo vevuka, ku tirhisiwa ka switirhisiwa swale hansi, vukulu lebyintsongo byo veka, torque leyintsongo yo chayela, ntirho wo olova naku hatlisa, kambe yitlhela yiva na ntirho wa kahle wa vulawuri bya ku khuluka xikan’we na swihlawulekisi swaku pfala ku pfala, naswona i yin’wana ya tinxaka ta ti valve leti kulaka hiku hatlisa eka malembe ya khume lawa yanga hundza. Ti valve ta maphaphatani ti tirhisiwa ngopfu. Kuhambana hambana na nhlayo ya matirhiselo ya yona swiya emahlweni swikula, naswona swikula kuya eka mahiselo yale henhla, ntshikelelo wale henhla, diameter leyikulu, ku tiya lokukulu, vutomi byo leha, swihlawulekisi swa kahle swa vulawuri, na mintirho yotala ya valve yin’we. Ku tshembheka ka yona na swikombiso swin’wana swa matirhelo swi fikelele xiyimo xa le henhla.
Hiku cheriwa ka rhaba ya synthetic leyi lwisanaka na ti khemikhali kuti valve ta phaphatani, matirhelo yati valve ta phaphataniyi antswisiwile. Hikuva rhaba ya synthetic yina swihlawulekisi swaku lwisana na corrosion, ku lwisana na erosion, ku tiya ka dimensional, ku tiyisela kahle, ku vumba hiku olova, ntsengo wale hansi, na swin’wana, rhaba ya synthetic leyingana swivumbeko swohambana hambana yinga hlawuriwa kuya hi swilaveko swohambana hambana swa matirhiselo kuva yi fikelela swiyimo swa ntirho swati valve ta phaphatani.
Hikuva polytetrafluoroethylene (PTFE) yina ku tiya lokukulu ka corrosion, matirhelo yo tiya, ayi olovi ku dyuhala, coefficient yale hansi ya friction, ya olova ku vumba, ku tiya ka dimensional, naswona yinga antswisa swivumbeko swa yona leswi heleleke hiku tata naku engetela switirhisiwa leswi faneleke, switirhisiwa swo pfalela valve ya phaphatani leswingana matimba yo antswa xikan’we na friction coefficient yale hansi swinga kumiwa, naswona swipimelo swa rhaba ya synthetic swinga kumiwa ku hluriwa, kutani swilo swa polymer polymeric leswi yimeriweke hi PTFE na swilo swa yona leswi cinciweke hi ku tata swi tirhisiwile ngopfu eka valve ya phaphatani, leswaku matirhelo ya valve ya phaphatani ya antswisiwile swinene.Tivalvu ta phaphatanihi mahiselo yo anama na ntshikelelo, matirhelo yo tshembheka yo pfalela xikan’we na vutomi byo leha bya ntirho swi endliwile.
Leswaku ku fikeleriwa swilaveko swa switirhisiwa swa ti indasitiri swofana na mahiselo yale henhla nale hansi, ku khuluka lokukulu, na vutomi byo leha, ti metal seal butterfly valves ti endliwile swinene. Hiku tirhisiwa ka ku tiya ka mahiselo yale henhla, ku tiya ka mahiselo yale hansi, ku tiya ka matimba ya corrosion, ku tiya ka matimba ya erosion, na switirhisiwa swa matimba yale henhla swa alloy eka ti valve ta maphaphatani, ti valve ta maphaphatani leti pfaleriweke hi nsimbi titirhisiwile ngopfu eka tinsimu ta ti indasitiri tofana na mahiselo yale henhla na yale hansi, ku khuluka lokukulu, na vutomi byo leha, na ti valve ta maphaphatani letingana dyayimeta leyikulu (9~750mm), ntshikelelo wale henhla (42.00MPa) na ku anama temperature range (-196~606°C) yi humelerile, leswaku thekinoloji ya ti valve ta maphaphatani yifikelele xiyimo lexintshwa.
Loko valve ya phaphatani yi pfuriwile hiku hetiseka, yina ku tiya lokuntsongo ka ku khuluka. Loko ku pfuleka ku ri exikarhi ka kwalomu ka 15°~70°, ku nga tirhisiwa eka vulawuri bya ku khuluka lebyi nga ni vuxiyaxiya, hikwalaho ku tirhisiwa ka valve ya phaphatani swi tolovelekile swinene eka ntirho wa ku lulamisiwa ka diameter leyikulu.
Hikwalaho ka ku famba loku sula-sulaka ka butterfly valve butterfly plate, ti valve totala ta maphaphatani tinga tirhisiwa eka swihangalasamahungu leswingana swilo swo tiya leswi yimisiweke. Kuya hi matimba ya seal, yinga tlhela yitirhisiwa eka powder na granular media.
Ti valve ta maphaphatani ti lulamerile eka vulawuri bya ku khuluka. Hikuva ku lahlekeriwa hi ntshikelelo wa valve ya phaphatani eka phayiphi swikulu swinene, kwalomu ka kanharhu eka valve ya gede, loko ku hlawuriwa valve ya phaphatani, nkucetelo wa ku lahlekeriwa hi ntshikelelo wa sisiteme ya phayiphi wufanele ku tekeriwa enhlokweni hiku hetiseka, naswona matimba ya butterfly plate kuva yi rhwala ntshikelelo wa medium ya phayiphi loko yi pfariwile na wona yafanele ku tekeriwa enhlokweni. Ku engetela kwalano, swipimelo swa mahiselo yo tirha lawa xitirhisiwa xa xitulu xa elastomeric xinga endliwaka eka mahiselo yale henhla na swona swifanele ku tekeriwa enhlokweni.
Valve ya phaphatani yina ku leha kutsongo ka ku aka xikan’we naku leha hinkwako, rivilo ro hatlisa ro pfula naku pfala, xikan’we na swihlawulekisi swa kahle swa vulawuri bya mati. Nsinya wa nawu wa xivumbeko xa ti valve ta maphaphatani wu lulamerile swinene eka ku endla ti valve ta ti bore letikulu. Loko ku laveka leswaku ku tirhisiwa valve ya phaphatani ku lawula mpimo wa ku khuluka, swina nkoka ku hlawula vukulu lebyi faneleke na muxaka wa valve ya phaphatani leswaku yita tirha kahle naku tirha kahle.
Hi xitalo, eka throttling, regulation control na mud medium, ku leha ka xivumbeko xa komile, rivilo ro pfula naku pfala ri hatlisa, naswona ku tsemiwa ka ntshikelelo wale hansi (ku hambana lokuntsongo ka ntshikelelo) swa laveka, naswona ku hlohleteriwa valve ya phaphatani. Ti valve ta maphaphatani tinga tirhisiwa loko kuri na ku lulamisiwa ka swiyimo swimbirhi, channel ya diameter leyi hungutiweke, mpfumawulo wale hansi, cavitation na vaporization, nhlayo yitsongo ya ku khuluka kuya e xibakabakeni, na abrasive media. Ehansi ka swiyimo swo hlawuleka swa ntirho, ku lulamisiwa ka throttling, kumbe ku pfariwa loku tiyeke, ku onhaka lokukulu, mahiselo yale hansi (cryogenic) na swiyimo swin’wana swa ntirho.
Nkarhi wa poso: Nov-02-2024
