NPT xov yog dab tsi?

NPT stands rau National Pipe Taper, uas yog US tus qauv rau tapered threads siv nyob rau hauv cov kav dej thiab cov yeeb nkab fittings rau lub hom phiaj ntawm sealing. NPT threads yog tsim los muab lub foob tsis muaj paug thaum siv nrog cov xov sealant, xws li Teflon daim kab xev lossis yeeb nkab dope. Lub taper ntawm NPT xov tso cai rau nws los tsim ib lub foob thaum sib txuas nrog lwm cov xov tapered.

Cov yam ntxwv tseem ceeb ntawm NPT threads muaj xws li:

1. Taper:Sab nraud txoj kab uas hla (OD) ntawm cov xov txo me ntsis los ntawm qhov pib mus rau qhov kawg ntawm cov xov. Qhov no taper, feem ntau yog 1/16 nti ib nti, pab tsim kom muaj lub foob kaw ntom nti raws li cov khoom tau nruj ua ke.

2. Xov Angle: NPT threads muaj 60-degree xov lub kaum sab xis, zoo ib yam li ntau lwm cov qauv ntsia hlau, tab sis cov duab thiab qhov sib txawv yog tsim tshwj xeeb rau cov yeeb nkab sib txuas.

3. Pitch: Lub suab (ntau ntawm threads ib nti) txawv nyob ntawm seb cov yeeb nkab nominal loj. Piv txwv li, 1/8-nti NPT muaj 27 xov ib nti, thaum 2-nti NPT muaj 11.5 xov ib nti.

4. Ntim:Txhawm rau kom muaj kev sib khi zoo, cov xov sealant yuav tsum tau siv. Yog tsis muaj nws, muaj feem ntau ntawm cov xau vim tias kev sib cuag ntawm cov hlau-rau-hlau ib leeg tsis tsim ib lub foob txaus.

5. Tes Tightening:NPT threads yuav tsum tau muab tes nruj ua ntej, ces muab ntxiv lem nrog ib tug ciaj ntswj kom ua tau raws li lub foob. Tus naj npawb ntawm cov lem ntxiv nyob ntawm qhov loj ntawm qhov haum thiab cov khoom siv; Feem ntau, 1.5 mus rau 3.5 tig dhau ntiv tes nruj yog pom zoo.

NPT threads feem ntau yog siv hauv cov kav dej, hydraulics, thiab pneumatic systems, thiab lwm yam, qhov yuav tsum tau muaj kev ruaj ntseg, xau-pov thawj kev sib txuas. Kuj tseem muaj cov ntawv foob qhuav hu ua NPTF (National Pipe Taper Fuel) uas yog tsim los muab cov tshuab foob yam tsis tas yuav tsum muaj lub sealant cais, txawm tias qee daim ntawv thov tseem yuav xav tau lub foob rau kev ruaj ntseg ntxiv.

Rau lwm cov lus nug ntsig txog NPT fittings lossis seem ntawm peb cov khoom catalog, thov hu rau peb.