1, yeeb nkab xov txheem:
Cov yeeb nkab xov: feem ntau yog siv rau kev sib txuas cov kav dej, kom cov xov sab hauv thiab sab nraud txuas nrog zoo, muaj ob hom yeeb nkab ncaj thiab lub khob hliav qab.
2, Feem ntau cov yeeb nkab xov yog cov hauv qab no: NPT, PT, G, thiab lwm yam.
a.NPT yog lub npe luv ntawm National (American) Yeeb Nkab Xov, belongs rau Asmeskas tus qauv 60 degrees vertebral xov, rau North America, lub teb chaws tus qauv yog hais txog GB / T12716-1991.
b.PT (BSPT) yog cov ntawv luv ntawm Cov Yeeb Nkab Xov, nws yog 55 degrees sealing round yeeb nkab xov, belongs rau Wyeth xov tsev neeg, siv nyob rau hauv cov teb chaws Europe thiab lub teb chaws Commonwealth, feem ntau siv nyob rau hauv cov dej thiab roj pipeline kev lag luam, taper 1:16, lub teb chaws tus qauv hais txog GB/T7306-2000. domestic hu ua ZG.
cG yog 55 degree non-threaded sealing yeeb nkab xov, teej tug mus rau tsev neeg ntawm Whitworth threads. Lub cim G qhia txog cylindrical xov. National standard reference GB/T7307-2001.
3, Qhov sib txawv ntawm metric xov thiab imperial xov:
Metric threads yog qhia nyob rau hauv cov nqe lus ntawm suab, thiab American threads yog qhia nyob rau hauv cov nqe lus ntawm cov xov tooj ntawm threads ib nti.
Metric threads yog 60 degree sib npaug sab ntug hom, British threads sib npaug duav 55 degree hom, American threads yog duav 60 degree hom.
Metric threads yog nyob rau hauv metric system. Inch threads siv lub imperial system.
Cov neeg feem ntau yog siv los hais tias cov xov loj, 1 nti yog sib npaug rau 8 ntsiab lus, 1/4 nti yog sib npaug rau 2 ntsiab lus, thiab lwm yam.
Tsis tas li ntawd, muaj: ISO - metric xov txheem 60 degrees; UN unified xov txheem 60 degrees; API - US roj av yeeb nkab xov txheem 60 degrees; W - British Wyeth xov txheem 55 degrees.
