Koj tau xaj ib lub tsheb thauj khoom ntawm li qub rau qhov project loj. Tab sis thaum lawv tuaj txog, cov xov tsis phim koj cov kav dej, ua rau qeeb qeeb thiab raug nqi rov qab.
Ob lub ntsiab ntawm pob valve threads yog NPT (National Pipe Taper) siv nyob rau hauv North America, thiab BSP (British Standard Pipe), muaj nyob txhua qhov chaw. Paub qhov twg koj cheeb tsam siv yog thawj kauj ruam rau kev sib txuas ntawm cov ntaub ntawv pov thawj.
Tau txais cov xov hom txoj cai yog ib qho tseem ceeb tshaj plaws, tseem ceeb, qhov chaw ntawm kev muab khoom. Kuv ib zaug tau ua haujlwm nrog Budi, tus thawj tswj hwm kev yuav khoom hauv Indonesia, uas yuam kev yuam kom lub thawv ntim nrog NPT xov tsis yogBSP txujsiv nyob rau hauv nws lub teb chaws. Nws yog ib qho yuam kev yooj yim uas ua rau mob taub hau loj. Cov xov zoo sib xws, tab sis lawv tsis sib xws thiab yuav xau. Dhau ntawm cov xov, muaj lwm yam kev sib txuas xws li lub qhov (socket) thiab flange uas daws teeb meem sib txawv. Cia peb paub tseeb tias koj tuaj yeem qhia lawv txhua tus sib nrug.
NPT txhais li cas ntawm lub pob valve?
Koj pom "NPT" ntawm daim ntawv qhia tshwj xeeb thiab xav tias nws tsuas yog cov xov txheem xwb. Kev tsis quav ntsej txog qhov kev nthuav dav no tuaj yeem ua rau kev sib txuas zoo li nruj tab sis xau hauv siab.
NPT sawvrau National Pipe Taper. Lo lus tseem ceeb yog "taper." Cov threads yog me ntsis angled, yog li lawv wedge ua ke thaum koj ceev lawv los tsim ib tug muaj zog mechanical foob.
Tus tsim tapered yog qhov zais cia tom qab NPT lub zog sib khi. Raws li ib tug txiv neej NPT threaded yeeb nkab screws rau hauv ib tug poj niam NPT haum, txoj kab uas hla ntawm ob qhov chaw hloov. Qhov kev cuam tshuam zoo sib tsoo cov xov ua ke, ua rau lub hauv paus foob. Txawm li cas los xij, qhov no hlau-ntawm-hlau lossis yas-rau-yas deformation tsis zoo tag nrho. Ib txwm muaj me me kauv qhov khoob sab laug. Tias yog vim li cas koj yuav tsum nco ntsoov siv xov sealant, zoo li PTFE daim kab xev lossis cov yeeb nkab dope, nrog NPT kev sib txuas. Lub sealant sau cov khoob khoob khoob no kom ua rau kev sib txuas tiag tiag-pov thawj. Cov qauv no tseem ceeb hauv Tebchaws Meskas thiab Canada. Rau cov neeg yuav khoom thoob ntiaj teb xws li Budi, nws yog ib qho tseem ceeb kom qhia meej "NPT" tsuas yog thaum lawv paub tseeb tias lawv txoj haujlwm xav tau; txwv tsis pub, lawv xav tau BSP tus qauv muaj nyob hauv Asia thiab Europe.
Dab tsi yog qhov sib txawv ntawm kev sib txuas valve?
Koj yuav tsum txuas lub valve mus rau ib 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 tseem ceeb ntawm kev sib txuas ntawm lub valve yog threaded rau cov kav dej, lub qhov (socket) rau cov kav dej PVC, thiab flanged rau loj, bolted yeeb nkab tshuab. Txhua tus yog tsim los rau cov khoom siv yeeb nkab sib txawv, qhov loj me, thiab xav tau kev saib xyuas.
Xaiv qhov kev sib txuas zoo yog qhov tseem ceeb raws li kev xaiv lub valve zoo. Lawv tsis yog interchangeable. Txhua tus ua haujlwm rau lub hom phiaj sib txawv thiab tsim nyog rau kev siv sib txawv. Xav txog lawv li kev sib txawv ntawm kev koom nrog txoj kev.Threaded kev sib txuaszoo ib yam li txoj kev sib tshuam,kev sib txuas ntawm qhov (socket).zoo li ib qho kev sib txuas mus tas li qhov twg ob txoj kev ua ib qho, thiab kev sib txuas flanged zoo li cov qauv txuas txuas uas tuaj yeem hloov tau yooj yim. Kuv ib txwm qhia Budi pab neeg los coj lawv cov neeg siv khoom raws li lawv lub neej yav tom ntej. Puas yog ib txoj kab dej ruaj khov uas yuav tsis hloov pauv? Siv lub qhov (socket) vuam. Puas yog kev sib txuas rau lub twj tso kua mis uas yuav xav tau hloov? Siv lub threaded los yog flanged valve kom yooj yim tshem tawm.
Main Valve Connection Hom
| Hom kev sib txuas | Nws ua haujlwm li cas | Zoo tshaj rau |
|---|---|---|
| Xov (NPT / BSP) | Valve screws rau ntawm cov yeeb nkab. | Cov kav dej me me (<4 "), cov tshuab xav tau kev tshem tawm. |
| Qhov (socket) | Cov yeeb nkab yog glued rau hauv qhov kawg valve. | Permanent, leak-proof PVC-rau-PVC pob qij txha. |
| Flanged | Valve yog bolted ntawm ob lub yeeb nkab flanges. | Cov kav dej loj (> 2 "), kev lag luam siv, kev saib xyuas yooj yim. |
Plaub hom pob li qub yog dab tsi?
Koj hnov tib neeg tham txog "ib thooj," "ob-thooj," lossis "peb-thooj" li qub. Qhov no suab tsis meej pem thiab koj txhawj xeeb koj tab tom yuav qhov tsis ncaj ncees lawm rau koj cov peev nyiaj thiab kev xav tau kev saib xyuas.
Pob li qub feem ntau categorized los ntawm lawv lub cev tsim: Ib-Piece (los yog Compact), Ob-Piece, thiab Peb-Piece. Cov qauv tsim no txiav txim siab lub valve tus nqi thiab seb nws puas tuaj yeem kho.
Thaum tib neeg qee zaum hais plaub hom, peb qhov kev tsim kho tseem ceeb npog yuav luag txhua daim ntawv thov. A"One-Piece" valve, feem ntau hu ua Compact valve, muaj lub cev ua los ntawm ib qho ntawm cov yas molded. Lub pob yog kaw rau hauv, yog li nws tsis tuaj yeem muab sib cais los kho. Qhov no ua rau nws qhov kev xaiv pheej yig tshaj plaws, tab sis nws yog qhov tseem ceeb pov tseg. Lub "Ob-Piece" valve muaj lub cev ua los ntawm ob qhov chaw uas ntsia hlau ua ke nyob ib ncig ntawm lub pob. Qhov no yog hom ntau tshaj plaws. Nws tuaj yeem raug tshem tawm ntawm lub raj xa dej thiab muab sib cais los hloov cov ntsaws ruaj ruaj sab hauv, muab qhov sib npaug ntawm cov nqi thiab kev pabcuam zoo. Lub "Three-Piece" valve yog qhov siab tshaj plaws. Nws muaj lub hauv nruab nrab lub cev uas muaj lub pob, thiab ob qhov kawg txuas txuas. Qhov kev tsim no tso cai rau koj tshem tawm lub cev tseem ceeb rau kev kho lossis hloov tsis tau txiav cov yeeb nkab. Nws yog qhov kim tshaj plaws tab sis yog qhov zoo tagnrho rau cov kab Hoobkas uas koj tsis tuaj yeem them nyiaj kaw ntev rau kev saib xyuas.
Qhov txawv ntawm NPT thiab flange kev twb kev txuas yog dab tsi?
Koj tab tom tsim lub kaw lus thiab yuav tsum xaiv ntawm cov xov los yog flanged li qub. Kev hu tsis raug tuaj yeem ua rau kev teeb tsa npau suav phem thiab kev saib xyuas ntau dua hauv txoj kev.
NPT kev sib txuas yog threaded thiab zoo tshaj plaws rau cov kav dej me me, tsim kom muaj kev sib txuas mus tas li uas nyuaj rau kev pabcuam. Flange kev sib txuas siv bolts thiab yog qhov zoo tagnrho rau cov kav dej loj, tso cai rau kev tshem tawm lub valve yooj yim rau kev saib xyuas.
Qhov kev xaiv ntawm NPT thiab flange tiag tiag los ntawm peb yam: yeeb nkab loj, siab, thiab kev xav tau kev saib xyuas. NPT threads yog qhov zoo heev rau cov kav dej me me, feem ntau 4 ntiv tes thiab qis dua. Lawv yog cov nqi-zoo thiab tsim kom muaj zog heev, siab-siab foob thaum ntsia kom raug nrog sealant. Lawv qhov downside loj yog kev saib xyuas. Txhawm rau hloov lub pob valve, feem ntau koj yuav tsum tau txiav cov yeeb nkab. Flanges yog cov kev daws teeb meem rau cov kav dej loj thiab rau txhua qhov system uas kev saib xyuas yog qhov tseem ceeb. Bolting lub valve ntawm ob lub flanges tso cai rau nws tshem tawm thiab hloov sai sai yam tsis muaj kev cuam tshuam cov kav dej. Qhov no yog vim li cas Budi cov neeg ua haujlwm cog lus uas tsim cov chaw kho dej loj yuav luag tsuas yog xaj 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
| Feature | NPT kev sib txuas | Flange kev twb kev txuas |
|---|---|---|
| Hom Loj | Me me (piv txwv li, 1/2 "mus rau 4") | Loj (piv txwv li, 2 "mus rau 24" +) |
| Kev teeb tsa | Screwed nrog sealant. | Bolted nruab nrab ntawm ob flanges nrog ib tug gasket. |
| Kev tu | nyuaj; feem ntau yuav tsum tau txiav cov yeeb nkab. | Yooj yim; unbolt valve thiab hloov. |
| Nqi | qis | Siab dua |
| Kev siv zoo tshaj plaws | General kav dej, me me irrigation. | Industrial, dej mains, loj systems. |
Xaus
Xaiv cov xov zoo lossis kev sib txuas - NPT, BSP, qhov (socket), lossis flange - yog qhov tseem ceeb tshaj plaws rau kev tsim kom muaj kev ruaj ntseg, tsis muaj pov thawj thiab ua kom yooj yim txij nkawm yav tom ntej.
Post lub sij hawm: Lub Xya hli ntuj-29-2025
