NPT, PT, G yog cov yeeb nkab xov
NPT yog lub npe luv ntawm National (American) Yeeb Nkab Xov, uas belongs rau American tus qauv 60-degree tapered yeeb nkab xov thiab yog siv nyob rau hauv North America. Cov qauv hauv tebchaws tuaj yeem pom hauv GB / T12716.
duab
PT yog lub ntsiab lus ntawm Cov Yeeb Nkab Xov, uas yog ib qho 55-degree kaw tapered yeeb nkab xov, uas belongs rau Whitworth xov tsev neeg thiab feem ntau yog siv nyob rau hauv Teb chaws Europe thiab lub Commonwealth ntawm lub teb chaws. Feem ntau siv hauv kev lag luam dej thiab roj yeeb nkab, taper tau teev tseg raws li 1:16. Cov qauv hauv tebchaws tuaj yeem pom hauv GB / T7306.
G yog 55-degree tsis-threaded sealing yeeb nkab xov, uas belongs rau Whitworth xov tsev neeg. Cim raws li G sawv rau cylindrical xov. Cov qauv hauv tebchaws tuaj yeem pom hauv GB / T7307.
Tsis tas li ntawd, 1/4, 1/2, thiab 1/8 cov cim hauv xov xa mus rau txoj kab uas hla ntawm cov xov loj, thiab chav tsev yog nti. Cov neeg hauv kev lag luam feem ntau siv cov ntsiab lus xa mus rau cov xov loj, ib nti yog sib npaug rau 8 ntsiab lus, 1/4 nti yog 2 ntsiab lus, thiab lwm yam.
G yog lub npe sib sau ua ke rau cov yeeb nkab xov (Guan), thiab kev faib ntawm 55 thiab 60 degrees yog qhov 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. Cov yeeb nkab dej dav dav yog qhov zoo li no, thiab lub teb chaws tus qauv raug cim raws li Rc.
Cov xov metric yog sawv cev los ntawm lub suab, thiab American thiab British xov yog sawv cev los ntawm cov xov tooj ntawm cov hniav ib nti, uas yog qhov sib txawv loj tshaj ntawm lawv.
Cov xov metric yog 60-degree equilateral profile, British xov yog ib qho isosceles 55-degree profile, thiab American xov yog 60 degrees.
Siv metric units rau metric threads thiab imperial units rau US thiab British threads.
Cov yeeb nkab xov yog tsuas yog siv rau kev sib txuas ntawm cov kav dej, thiab nws cov xov sab hauv thiab sab nraud tau sib raug zoo, thiab muaj ob hom yeeb nkab ncaj thiab tapered yeeb nkab. Lub nominal txoj kab uas hla yog hais txog txoj kab uas hla ntawm cov yeeb nkab txuas nrog, pom tseeb tias txoj kab uas hla yog loj dua lub nominal txoj kab uas hla. 1/4, 1/2, 1/8 yog cov nominal diameters ntawm British xov, nyob rau hauv nti.
Xov lub kaum sab xis: ob lub metric thiab American threads yog 60 degrees, British system yog 55 degrees, TM dej yeeb nkab xov yog 30 degrees, SM koob tsheb xov thiab BC xov kuj tseem 60 degrees, metric trapezoidal xov yog 30 degrees, imperial trapezoidal xov yog 29 degrees, lub rooj ntev zaum xov (TW29 degrees TR thiab TM30 degrees).
Ordinary xov: metric xov M; imperial W; American UNC, UNE, UNEF
Cov yeeb nkab xov: British PS, PT, PF; American NPS, NPT, NPTF, NPSM
Cua nozzle xov: Sab nraud ntawm CTV thiab TV 1/4-20 yog 1A: 0.2367-0.2489 (6.012-6.322); 2A: {{10}}. .350).
British xov: raws li qhov nominal loj thiab tus naj npawb ntawm threads ib nti los tsim specifications
Xws li 1/4"-20, 3/4"-10, 1"-8, 1/4"-20 txhais tau tias qhov nominal loj yog 1/4, uas yog , txoj kab uas hla loj yog 6.35mm (25.4 faib los ntawm 4=6.35) 20 hniav ib nti, Yog li ntawd thiab lwm yam.
NPT xov luv me me
