NPT yeeb nkab fittings los yog lub teb chaws yeeb nkab, los yog National Yeeb Nkab Tapered, yog ib tug American txuj raws li AMSE B1.20.1. Tus qauv qhia txog qhov ntev thiab kam rau ua ntawm tapered threads rau cov kav dej thiab fittings. Tsis zoo li cov xov ncaj, tapered threads muab lub foob zoo dua, tshwj xeeb tshaj yog thaum siv nrog cov khoom sib khi zoo li Teflon daim kab xev. Tus qauv muaj ntau tshaj li ib puas xyoo thiab tau pib txhais rau kev siv kav dej; Txawm li cas los xij, nws tau pom kev siv tau zoo hauv hydraulic thiab roj conveyance ib yam nkaus.
Loj hauv NPT Threaded yeeb nkab fittings
NPT txhais cov xov sab hauv thiab sab nraud ntawm fittings uas ua raws li tus qauv; li no sizing charts muab txoj kab uas hla ntsuas rau ob leeg txiv neej thiab poj niam qhov chaw. Yog li ntawd, tag nrho cov txiv neej thiab poj niam haum hom muaj sib xws, adhering rau tib lub taper tus nqi - hloov nyob rau hauv xov txoj kab uas hla ntawm ib chav tsev ntev. Rau NPT tus qauv, tus nqi taper yog ¾ nti ib ko taw lossis 1/16 nti ib nti.
Txij li thaum OD yog ntsuas los ntawm qhov nruab nrab, qhov tsis meej pem yuav tshwm sim thaum xaiv qhov loj haum haum. Ib qho NPT haum sau ua 1/8 "muaj qhov tseeb sab nraud ntawm 3/8". Yog li ceev faj thaum xaiv NPT fittings, raws li koj yuav xaus siv lub haum uas xoob dhau. Daim ntawv qhia hauv qab no qhia txog qhov ntev ntawm qee qhov ntau thiab tsawg siv. Nco ntsoov tias qee qhov NPT haum qhov loj me muaj tib TPI; yog li lawv tuaj yeem siv rau ib leeg ntawm tus account ntawm taper.
Qhov zoo ntawm kev siv NPT Thread Pipe Fittings
Muab hais tias tus qauv tau nyob ib puag ncig ib ntus, nws muaj cov txheej txheem zoo thaum siv. Nws tuaj yeem muaj nyob rau hauv cov khoom muag muag, nrog ntau qhov ntau thiab tsawg thiab cov ntaub ntawv xaiv los ntawm. Qhov no tso cai rau koj siv lawv rau ntau daim ntawv thov ntawm qhov sib txawv. Ntxiv mus, lawv tuaj yeem sib sau ua ke hauv ib qho yooj yim raws li kev sib cuag ntawm cov hlau-rau-hlau muaj ib qho kev foob zoo heev.
Qhov tsis zoo ntawm kev siv NPT Xov Yeeb Fittings
Kev sib cuag hlau-rau-hlau nyob rau hauv NPT fittings cia siab rau lub deformation ntawm threads los tsim ib tug ruaj ntseg foob. Qhov no, txawm li cas los xij, txhais tau hais tias ib tus tsis tuaj yeem siv lawv hauv cov ntawv thov uas yuav tsum tau ua kom nquag plias.
Yog tias siv tsis raug, qhov ntawd yog, tsis muaj kev sib raug zoo, kev sib tw, lossis qhov loj me, cov chaw nres nkoj yuav nthuav dav, thiab cov kab nrib pleb tuaj yeem tsim ntawm cov xov. Qhov no, nyob rau hauv lem, coj mus rau tsim ntawm leakage txoj kev los ntawm qhov chaw nruab nrab tuaj yeem tawm. Nws yog vim li no tias NPT fittings tsis pom zoo rau cov ntawv thov siab heev.
