NPT, PT, G yog tag nrho cov yeeb nkab xov.
NPT yog lub npe luv ntawm National (American) Yeeb Nkab Xov, uas belongs rau American standard 60 degree taper yeeb nkab xov siv nyob rau hauv North America.
PT yog lub ntsiab lus ntawm Cov Yeeb Nkab Xov, uas yog 55-degree kaw conical yeeb nkab xov, uas belongs rau Whitworth xov tsev neeg thiab feem ntau yog siv nyob rau hauv Teb chaws Europe thiab lub tebchaws United Nations. Feem ntau siv hauv kev lag luam dej thiab roj yeeb nkab, taper tau teev tseg raws li 1:16.
G yog 55 degree non-threaded sealing yeeb nkab xov, uas belongs rau Whitworth xov tsev neeg. Cim raws li G sawv rau cylindrical xov.
Tsis tas li ntawd, 1/4, 1/2, thiab 1/8 cov cim hauv xov yog hais txog txoj kab uas hla ntawm cov yeeb nkab hauv inches.Cov neeg sab hauv feem ntau xa mus rau cov xov loj hauv xees, 1 nti sib npaug 8 xees, 1/4 nti sib npaug 2 xees, thiab lwm yam.
G yog lub npe dav dav rau cov yeeb nkab xov, thiab qhov sib faib ntawm 55 thiab 60 degrees yog kev ua haujlwm, feem ntau hu ua yeeb nkab voj voog. Uas yog, cov xov yog machined los ntawm ib tug cylindrical nto.
ZG feem ntau hu ua yeeb nkab cone, uas yog, cov xov yog ua tiav los ntawm lub conical nto, thiab cov yeeb nkab dej dav dav yog zoo li no.
Rc txhais tau hais tias conical hauv xov, ZG txhais tau hais tias taper yeeb nkab xov, 3/4 "txhais tau tias nti cim, uas yog 3/4 nti conical yeeb nkab xov, lub teb chaws tus txheej txheem teev hais tias lub loj txoj kab uas hla ntawm ZG 3/4" xov yog 26.44 hli.Nws cov sawv cev yuav tsum yog: ZG 3/4 ". qhov twg (〃) yog lub cim rau ntiv tes. Ib nti yog sib npaug rau 8 xees. Keeb kwm ntawm 3/4 yog 6/8=3/4. Feem ntau hu ua 6 ntsiab lus.
Tib ZG 1/2 ″ xov loj txoj kab uas hla ≈ 21mm. Feem ntau hu ua 4 ntsiab lus. ZG 1 ″ xov loj txoj kab uas hla ≈ 33mm. Feem ntau hu ua 1 nti. ZG 1 1/2" threaded tube OD ≈ 48mm. Feem ntau hu ua 1 nti thiab ib nrab.
Tapered yeeb nkab threads zoo ib yam li cov yeeb nkab xov, qhov sib txawv tsuas yog taper. Nco ntsoov tias qhov yooj yim qhov ntev rau qhov txawv ntawm cov yeeb nkab xov los ntawm cov xov zoo tib yam sib txawv.
DN yog lub nominal txoj kab uas hla
