2.5 I-valve yokuxhuma

I-valve yokuxhuma i-valve esebenzisa umzimba wepulaki onembobo ephumela njengengxenye evulayo nevalayo, futhi umzimba wepulaki uzungezisa ngesiqu se-valve ukuze kuzuzwe ukuvula nokuvala.I-valve yepulaki inesakhiwo esilula, ukuvula nokuvala okusheshayo, ukusebenza okulula, ukumelana noketshezi oluncane, izingxenye ezimbalwa nesisindo esincane.Ama-valve okuxhuma atholakala ngezinhlobo eziqondile, ezinezindlela ezintathu kanye nezine.I-valve yepulaki eqondile isetshenziselwa ukusika i-medium, futhi ama-valve amapulaki anezindlela ezintathu nezine asetshenziselwa ukuguqula isiqondiso se-medium noma ukuguqula okuphakathi.

2.6Butterfly valve

I-Butterfly valve iyipuleti levemvane elizungeza ngo-90° lizungeze i-eksisi egxilile emzimbeni wevalvu ukuze kuqedelwe umsebenzi wokuvula nokuvala.Ama-valve ovemvane mancane ngosayizi, alula ngesisindo futhi alula ngesakhiwo, ahlanganisa izingxenye ezimbalwa kuphela.

Futhi ingavulwa futhi ivalwe ngokushesha ngokuzungeza i-90 °, okulula ukuyisebenzisa.Uma i-valve uvemvane isendaweni evuleke ngokugcwele, ubukhulu bepuleti uvemvane yibo kuphela ukumelana lapho okuphakathi kugeleza emzimbeni wevalvu.Ngakho-ke, ukwehla kokucindezela okukhiqizwa yi-valve kuncane kakhulu, ngakho kunezici ezinhle zokulawula ukugeleza.Ama-valve ovemvane ahlukaniswe abe izinhlobo ezimbili zokuvala: uphawu oluthambile olunwebekayo kanye nophawu oluqinile lwensimbi.I-valve yokuvala enwebekayo, indandatho yokuvala ingashumeka emzimbeni we-valve noma ixhunywe kuma-periphery wepuleti lovemvane.Inokusebenza okuhle kokuvala futhi ingasetshenziselwa ukudonsa, amapayipi e-vacuum aphakathi nendawo kanye nemidiya ebolayo.Amavalvu anezigxivizo zensimbi ngokuvamile anesikhathi eside sokusebenza kunamavalvu anezimpawu ezinwebekayo, kodwa kunzima ukufeza ukuvaleka okuphelele.Ngokuvamile zisetshenziswa ezimweni lapho ukugeleza nokwehla kwengcindezi kushintsha kakhulu futhi ukusebenza kahle kwe-throttling kuyadingeka.Izigxivizo zensimbi zingakwazi ukuzivumelanisa nezinga lokushisa eliphakeme lokusebenza, kuyilapho izigxivizo ezinwebekayo zinesimo esibi sokunqunyelwa izinga lokushisa.

2.7Hlola i-valve

I-valve yokuhlola iyi-valve engavimbela ngokuzenzakalelayo ukugeleza koketshezi olubuyela emuva.I-disc ye-valve yokuhlola ivula ngaphansi kwesenzo sokucindezela kwamanzi, futhi uketshezi lugeleza lusuka ohlangothini lokungena luye ohlangothini lokuphuma.Lapho ingcindezi ehlangothini lokungena iphansi kunohlangothi lokuphuma, i-disc ye-valve ivala ngokuzenzakalelayo ngaphansi kwesenzo somehluko we-fluid pressure, amandla ayo adonsela phansi kanye nezinye izici zokuvimbela uketshezi ukuthi lungabuyeli emuva.Ngokwefomu lesakhiwo, lingahlukaniswa libe yi-valve yokuhlola i-lift kanye ne-swing check valve.Uhlobo oluphakamisayo lunokuvalwa okungcono nokumelana noketshezi olukhulu kunohlobo lokushwiba.Ukuze uthole indawo yokudonsa yepayipi lokudonsa lepompo, i-valve engezansi kufanele isetshenziswe.Umsebenzi wayo ukugcwalisa ipayipi lokungena kwepompo ngamanzi ngaphambi kokuqala iphampu;ngemva kokumisa iphampu, gcina ipayipi lokungena kanye nomzimba wepompo ugcwele amanzi ukulungiselela ukuqala futhi.I-valve engezansi ivamise ukufakwa kuphela epayipini elime mpo endaweni yokungena yepompo, futhi ephakathi igeleza isuka phansi iye phezulu.

2.8I-valve ye-diaphragm

Ingxenye evulayo nevalayo ye-valve ye-diaphragm iyi-diaphragm yerabha, ehlanganiswe phakathi komzimba we-valve kanye nesembozo se-valve.

Ingxenye ephakathi nendawo ephumayo ye-diaphragm igxilile esiqwini se-valve, futhi umzimba we-valve ufakwe irabha.Njengoba i-medium ingangeni emgodini wangaphakathi wekhava ye-valve, isiqu se-valve asidingi ibhokisi lokugxusha.I-valve ye-diaphragm inesakhiwo esilula, ukusebenza kahle kokuvala, ukugcinwa okulula, nokumelana noketshezi oluphansi.Amavalvu e-diaphragm ahlukaniswe ngohlobo lwe-weir, uhlobo oluqondile, uhlobo lwe-engeli yesokudla kanye nohlobo lokugeleza okuqondile.

3. Iziyalezo ezivame ukusetshenziswa zokukhetha ama-valve

3.1 Imiyalo yokukhetha ivalvu yesango

Ngaphansi kwezimo ezijwayelekile, ama-valve esango kufanele akhethwe.Ngaphezu kokufaneleka kwe-steam, uwoyela kanye neminye imithombo yezindaba, ama-valve esango nawo afaneleka emithonjeni equkethe izinto eziqinile ze-granular kanye ne-viscosity ephezulu, futhi afanele ama-valve ku-venting kanye nezinhlelo ze-vacuum eziphansi.Ukuze uthole imidiya equkethe izinhlayiya eziqinile, umzimba we-valve wesango kufanele ufakwe imbobo yokuhlanza eyodwa noma ezimbili.Ukuze uthole imidiya yokushisa ephansi, ama-valve amasango akhethekile asezingeni eliphansi kufanele akhethwe.

3.2 Imiyalelo yokukhethwa kwamavalvu okumisa

I-valve yokumisa ifanele amapayipi anezidingo ezixegayo ekumelaneni noketshezi, okungukuthi, ukulahlekelwa kwengcindezi akubhekwa njengokuningi, namapayipi noma amadivaysi anokushisa okuphezulu kanye nemidiya yokucindezela okukhulu.Ilungele amapayipi omusi namanye aphakathi nendawo ane-DN <200mm;ama-valve amancane angasebenzisa ama-valve asikiwe.Ama-valve, njengama-valve enaliti, ama-valve ensimbi, ama-valve esampula, ama-valve okulinganisa ukucindezela, njll.;ama-valve amisayo anokulungiswa kokugeleza noma ukulungiswa kwengcindezi, kodwa ukunemba kokulungiswa akudingekile, futhi ububanzi bepayipi buncane uma kuqhathaniswa, ngakho-ke i-valve yokumisa noma i-valve edonsayo kufanele isetshenziswe I-Valve;Kumithombo yezindaba enobuthi obukhulu, i-valve yokumisa evalwe nge-bellows kufanele isetshenziswe;kodwa-ke, i-valve yokumisa akufanele isetshenziselwe imidiya ene-viscosity ephezulu kanye nemidiya equkethe izinhlayiya ezijwayele ukuthungwa, futhi akufanele isetshenziswe njenge-valve yokukhipha umoya kanye ne-valve ohlelweni lwe-vacuum ephansi.

3.3 Imiyalo yokukhetha ivalvu yebhola

Ama-valve ebhola afanele izinga lokushisa eliphansi, i-high-pressure, nemidiya ye-viscosity ephezulu.Ama-valve amaningi ebhola angasetshenziswa emithonjeni yezindaba enezinhlayiya eziqinile ezimisiwe, futhi angasetshenziswa emithonjeni eyimpuphu kanye ne-granular ngokuya ngezidingo zezinto zokuvala;ama-valve amabhola esiteshi esigcwele awafaneleki ukulawulwa kokugeleza, kodwa afanele izikhathi ezidinga ukuvulwa nokuvala ngokushesha, okulula ukukusebenzisa.Ukunqanyulwa kwezimo eziphuthumayo ezingozini;ngokuvamile kunconywa kumapayipi asebenza ngokuvala ngokuqinile, ukuguga, ukushwabana kwamashaneli, ukunyakaza kokuvula nokuvala ngokushesha, ukunqanyulwa komfutho ophezulu (umehluko omkhulu wengcindezi), umsindo ophansi, ukwenzeka kwe-gasification, i-torque encane yokusebenza, nokumelana noketshezi oluncane.Sebenzisa ama-valve ebhola;ama-valve ebhola afanele izakhiwo zokukhanya, ama-cut-off-pressure cut-offs, kanye nemidiya edlayo;ama-valve ebhola nawo angama-valve afaneleka kakhulu okushisa okuphansi kanye nemidiya ye-cryogenic.Kuzinhlelo zamapayipi kanye namadivayisi anemidiya esezingeni eliphansi lokushisa, ama-valve ebhola asezingeni eliphansi anesembozo se-valve kufanele asetshenziswe;khetha Uma usebenzisa i-valve yebhola elintantayo, impahla yayo yokuhlala kufanele ithwale umthwalo webhola kanye nendawo yokusebenza.Ama-valve ebhola anobubanzi obukhulu adinga amandla amakhulu ngesikhathi sokusebenza.Amavalvu ebhola ane-DN ≥ 200mm kufanele asebenzise ukudluliswa kwegiya lezikelemu;ama-valve ebhola angaguquki afanele ama-diameter amakhulu kanye nezimo zokucindezela okuphezulu;ngaphezu kwalokho, ama-valve amabhola asetshenziswa ekucubunguleni amapayipi ezinto ezinobuthi kakhulu kanye nemidiya evuthayo kufanele abe nezakhiwo ezivikela umlilo kanye ne-anti-static.

3.4 Imiyalo yokukhetha i-throttle valve

I-valve ye-throttle ifanele izikhathi lapho izinga lokushisa eliphakathi liphansi futhi ukucindezela kuphezulu.Ifanele izingxenye ezidinga ukulungisa izinga lokugeleza nokucindezela.Ayifanele imidiya ene-viscosity ephezulu nezinhlayiya eziqinile, futhi ayifanele ukusetshenziswa njenge-valve yokuhlukanisa.

3.5 Imiyalelo yokukhetha i-valve yokuxhuma

I-valve yokuxhuma ifanele izikhathi ezidinga ukuvulwa nokuvala ngokushesha.Ngokujwayelekile ayilungele isitimu namaphakathi nezinga lokushisa eliphakeme.Isetshenziselwa okuphakathi nendawo enezinga lokushisa eliphansi kanye ne-viscosity ephezulu, futhi ifaneleka phakathi nezinhlayiya ezimisiwe.

3.6 Imiyalo yokukhetha ivalvu uvemvane

Amavalve ovemvane afaneleka ezimweni ezinobubanzi obukhulu (njenge-DN﹥600mm) nobude obufushane besakhiwo, kanye nezimo lapho ukulungiswa kokugeleza nokuvuleka nokuvala ngokushesha kuyadingeka.Ngokuvamile zisetshenziselwa amanzi, uwoyela kanye nemikhiqizo yokucindezela enamazinga okushisa ≤80°C nezingcindezi ≤1.0MPa.Umoya neminye imidiya;ngenxa yokuthi ukuncipha kokucindezela kwamavalvu ovemvane kukhulu uma kuqhathaniswa namavalvu esango namabhola, amavalvu ovemvane afaneleka ezinhlelweni zamapayipi anezidingo zokulahlekelwa ukucindezela okuxekethile.

3.7 Hlola imiyalelo yokukhetha i-valve

Ama-valve okuhlola ngokuvamile afanelekela imidiya ehlanzekile futhi ayifanele imidiya equkethe izinhlayiya eziqinile kanye ne-viscosity ephezulu.Uma i-DN ≤ 40mm, i-valve yokuhlola i-lift kufanele isetshenziswe (ivunyelwe kuphela ukufakwa kumapayipi avundlile);lapho i-DN = 50 ~ 400mm, ivalve yokuhlola i-swing lift kufanele isetshenziswe (ingafakwa kuwo womabili amapayipi avundlile naqondile, Uma efakwe epayipini eliqondile, isiqondiso sokugeleza okuphakathi kufanele sisuke phansi siye phezulu);lapho i-DN ≥ 450mm, i-valve yokuhlola i-buffer kufanele isetshenziswe;lapho i-DN = 100 ~ 400mm, i-valve yokuhlola i-wafer nayo ingasetshenziswa;i-valve yokuhlola i-swing I-valve yokubuyisela ingenziwa ibe nokucindezela okukhulu kakhulu kokusebenza, i-PN ingafinyelela ku-42MPa, futhi ingasetshenziswa kunoma iyiphi indawo yokusebenza nanoma yiluphi uhlobo lokushisa olusebenzayo kuye ngezinto zegobolondo nezimpawu.Okuphakathi kwamanzi, isitimu, igesi, i-corrosive medium, uwoyela, umuthi, njll. Izinga lokushisa elisebenzayo le-medium liphakathi kuka -196~800℃.

3.8 Imiyalo yokukhetha ivalvu ye-diaphragm

Ivalvu ye-diaphragm ifanele uwoyela, amanzi, imidiya ene-asidi kanye nemidiya equkethe izinto eziqinile ezimisiwe ezinezinga lokushisa lokusebenza elingaphansi kuka-200°C kanye nokucindezela okungaphansi kuka-1.0MPa.Ayilungele izinyibilikisi eziphilayo kanye nemidiya eqinile ye-oxidant.Amavalvu e-diaphragm yohlobo lwe-Weir kufanele akhethelwe imidiya ye-granular abrasive.Uma ukhetha i-valve ye-diaphragm yohlobo lwe-weir, bheka ithebula lezimpawu zokugeleza;uketshezi lwe-viscous, ama-slurries kasimende kanye nemithombo ye-precipitating kufanele isebenzise ama-valve e-diaphragm aqondile;ngaphandle kwezidingo ezithile, ama-valve e-diaphragm akufanele asetshenziswe kumapayipi e-vacuum kanye nezinto zokusebenza ze-vacuum.