Koj tau xaj ntau lub tsheb thauj khoom ntawm cov kav dej rau ib qho project loj. Tab sis thaum lawv tuaj txog, cov xov tsis phim koj cov kav dej, ua rau muaj kev ncua sijhawm loj heev thiab cov nqi rov qab kim heev.

Ob hom xov tseem ceeb ntawm lub pob valve yog NPT (National Pipe Taper) siv hauv North America, thiab BSP (British Standard Pipe), uas feem ntau nyob txhua qhov chaw. Kev paub tias koj cheeb tsam siv hom twg yog thawj kauj ruam rau kev sib txuas uas tsis xau.

Kev tau txais hom xov kom raug yog ib qho ntawm cov khoom yooj yim tshaj plaws, tab sis tseem ceeb heev, ntawm kev nrhiav khoom. Kuv tau ua haujlwm nrog Budi, tus thawj tswj kev yuav khoom hauv Indonesia, uas tau xaj ib lub thawv ntawm cov li qub nrog NPT xov es tsis yogTus qauv BSPsiv hauv nws lub tebchaws. Nws yog ib qho yuam kev yooj yim uas ua rau mob taub hau loj heev. Cov xov zoo sib xws, tab sis lawv tsis sib xws thiab yuav xau. Dhau li ntawm cov xov, muaj lwm hom kev sib txuas xws li lub qhov (socket) thiab flange uas daws cov teeb meem sib txawv. Cia peb xyuas kom tseeb tias koj tuaj yeem qhia lawv sib nrug.

NPT txhais li cas rau ntawm lub pob valve?

Koj pom "NPT" ntawm daim ntawv qhia txog tus qauv thiab xav tias nws tsuas yog ib txoj xov txheem xwb. Kev tsis quav ntsej txog cov ntsiab lus no tuaj yeem ua rau muaj kev sib txuas uas zoo li nruj tab sis xau thaum muaj kev nyuaj siab.

NPT sawv ntsugrau National Pipe Taper. Lo lus tseem ceeb yog "taper." Cov xov yog me ntsis angled, yog li lawv wedge ua ke thaum koj zawm lawv kom tsim tau lub foob kho tshuab muaj zog.

Tus qauv tapered yog qhov zais cia tom qab NPT lub zog sealing. Thaum ib tug txiv neej NPT threaded yeeb nkab ntsia rau hauv ib tug poj niam NPT fitting, lub cheeb ntawm ob qhov chaw hloov. Qhov kev cuam tshuam haum no crushes cov xov ua ke, tsim lub thawj foob. Txawm li cas los xij, qhov no hlau-rau-hlau lossis yas-rau-yas deformation tsis zoo tag nrho. Yeej ib txwm muaj me me kauv qhov sib txawv tshuav. Yog vim li cas koj yuav tsum ib txwm siv cov xov sealant, zoo li PTFE daim kab xev lossis yeeb nkab dope, nrog NPT kev sib txuas. Cov sealant sau cov microscopic qhov sib txawv no kom ua rau qhov kev sib txuas tiag tiag leak-proof. Tus qauv no yog tseem ceeb hauv Tebchaws Meskas thiab Canada. Rau cov neeg yuav khoom thoob ntiaj teb zoo li Budi, nws yog ib qho tseem ceeb kom qhia "NPT" tsuas yog thaum lawv paub tseeb tias lawv qhov project xav tau nws; txwv tsis pub, lawv xav tau tus qauv BSP feem ntau hauv Asia thiab Europe.

Cov hom kev sib txuas ntawm lub valve yog dab tsi?

Koj yuav tsum txuas lub valve rau lub yeeb nkab. Tab sis koj pom cov kev xaiv rau "threaded," "socket," thiab "flanged," thiab tsis paub tseeb tias qhov twg yog qhov zoo rau koj txoj haujlwm.

Peb hom kev sib txuas ntawm lub valve tseem ceeb yog threaded rau cov kav dej ntsia hlau, socket rau cov kav dej PVC uas nplaum, thiab flanged rau cov kav dej loj, bolted. Txhua tus yog tsim los rau cov khoom siv yeeb nkab sib txawv, qhov loj me, thiab qhov xav tau kev saib xyuas sib txawv.

Kev xaiv hom kev sib txuas zoo yog qhov tseem ceeb ib yam li kev xaiv lub valve zoo. Lawv tsis tuaj yeem hloov pauv tau. Txhua tus ua haujlwm sib txawv thiab haum rau ntau daim ntawv thov. Xav txog lawv ua ntau txoj hauv kev sib txawv ntawm kev koom nrog txoj kev.Kev sib txuas xovzoo li ib qho kev sib tshuam ib txwm muaj,kev sib txuas ntawm lub qhov (socket)zoo li kev sib xyaw ua ke tas mus li uas ob txoj kev ua ib txoj, thiab kev sib txuas flanged zoo li ib ntu choj modular uas tuaj yeem hloov pauv tau yooj yim. Kuv ib txwm qhia Budi pab neeg kom coj lawv cov neeg siv khoom raws li lawv lub cev yav tom ntej. Puas yog nws yog ib txoj kab dej tas mus li uas yuav tsis hloov pauv li? Siv lub qhov (socket weld). Puas yog nws yog kev sib txuas rau lub twj tso kua mis uas yuav xav tau hloov? Siv lub valve threaded lossis flanged kom yooj yim tshem tawm.

Cov Hom Kev Sib Txuas Lus Tseem Ceeb

Plaub hom pob valve yog dab tsi?

Koj hnov ​​​​​​cov neeg tham txog "ib daim," "ob daim," lossis "peb daim". Qhov no zoo li tsis meej pem thiab koj txhawj xeeb tias koj yuav qhov tsis raug rau koj cov peev nyiaj thiab kev saib xyuas.

Cov pob valve feem ntau raug faib ua pawg raws li lawv lub cev: Ib Daim (lossis Me Me), Ob Daim, thiab Peb Daim. Cov qauv no txiav txim siab tus nqi ntawm lub valve thiab seb nws puas tuaj yeem kho tau.

Txawm hais tias tib neeg qee zaum hais txog plaub hom, peb hom kev tsim kho tseem ceeb npog yuav luag txhua daim ntawv thov."Ib Daim" valve, feem ntau hu ua Compact valve, muaj lub cev ua los ntawm ib daim yas pwm. Lub pob tau kaw sab hauv, yog li nws tsis tuaj yeem raug rhuav tshem rau kev kho. Qhov no ua rau nws yog qhov pheej yig tshaj plaws, tab sis nws yog pov tseg. Lub valve "Two-Piece" muaj lub cev ua los ntawm ob ntu uas ntsia hlau ua ke nyob ib puag ncig lub pob. Qhov no yog hom feem ntau. Nws tuaj yeem raug tshem tawm ntawm cov kav dej thiab raug rhuav tshem los hloov cov ntsaws ruaj ruaj sab hauv, muab qhov sib npaug zoo ntawm tus nqi thiab kev pabcuam. Lub valve "Three-Piece" yog qhov siab tshaj plaws. Nws muaj lub cev nruab nrab uas muaj lub pob, thiab ob lub qhov kawg sib cais. Tus qauv tsim no tso cai rau koj tshem tawm lub cev tseem ceeb rau kev kho lossis hloov pauv yam tsis tau txiav cov kav dej. Nws yog qhov kim tshaj plaws tab sis zoo tagnrho rau cov kab hauv Hoobkas uas koj tsis tuaj yeem them taus kev kaw ntev rau kev saib xyuas.

Qhov txawv ntawm NPT thiab flange kev sib txuas yog dab tsi?

Koj tab tom tsim ib lub tshuab thiab yuav tsum xaiv ntawm cov li qub uas muaj xov lossis cov li qub uas muaj flange. Kev xaiv tsis raug yuav ua rau kev teeb tsa nyuaj heev thiab kev saib xyuas kim dua yav tom ntej.

Cov kev sib txuas NPT yog cov xov thiab zoo tshaj plaws rau cov kav dej me me, tsim kom muaj kev sib txuas tas mus li uas nyuaj rau kev pabcuam. Cov kev sib txuas flange siv cov bolts thiab zoo tagnrho rau cov kav dej loj dua, ua rau yooj yim tshem tawm lub valve rau kev saib xyuas.

Qhov kev xaiv ntawm NPT thiab flange yeej yog nyob ntawm peb yam: qhov loj ntawm cov yeeb nkab, qhov siab, thiab qhov xav tau kev saib xyuas. Cov xov NPT zoo heev rau cov yeeb nkab me me, feem ntau yog 4 nti thiab qis dua. Lawv pheej yig thiab tsim kom muaj lub foob muaj zog heev, siab thaum ntsia kom raug nrog cov sealant. Lawv qhov tsis zoo loj yog kev saib xyuas. Txhawm rau hloov lub valve threaded, koj feem ntau yuav tsum txiav cov yeeb nkab. Flanges yog qhov kev daws teeb meem rau cov yeeb nkab loj dua thiab rau txhua lub kaw lus uas kev saib xyuas yog qhov tseem ceeb. Kev ntsia lub valve ntawm ob lub flanges tso cai rau nws raug tshem tawm thiab hloov pauv sai sai yam tsis cuam tshuam cov yeeb nkab. Qhov no yog vim li cas Budi cov neeg siv khoom cog lus uas tsim cov chaw kho dej loj yuav luag tsuas yog xaj cov flanged li qub. Lawv raug nqi ntau dua, tab sis lawv txuag tau ntau lub sijhawm thiab kev ua haujlwm thaum kho yav tom ntej.

NPT vs. Flange Sib Piv

Xaus lus

Xaiv cov xov lossis kev sib txuas kom raug—NPT, BSP, lub qhov (socket), lossis flange—yog kauj ruam tseem ceeb tshaj plaws rau kev tsim kom muaj lub kaw lus ruaj ntseg, tsis muaj qhov xau thiab xyuas kom yooj yim rau kev saib xyuas yav tom ntej.