Taw qhia
Hauv cov kav dej, ob hom xov yog siv - National Pipe Thread (NPT) thiab Poj Niam Hlau Yeeb (FIP). Cov xov no yog qhov tseem ceeb kom paub txhawm rau txhawm rau txuas ob lub kav dej lossis fittings kom zoo.
NPT Xov
National Pipe Thread (NPT) yog ib hom qauv ntawm cov xov siv hauv cov kav dej. Nws yog ib qho tapered xov, txhais tau hais tias txoj kab uas hla ntawm cov xov txo qis thaum nws tau los ze rau qhov kawg ntawm qhov haum. Qhov kev tsim no tso cai rau kev sib khi nruj dua, vim tias lub tapering tsim kom muaj kev sib khi ntawm kev sib txuas.
NPT threads yog siv rau cov txiv neej fittings, xws li cov kav dej los yog txiv mis. Internal threads ntawm ib tug poj niam haum, xws li ib tug coupling los yog lub luj tshib, phim rau sab nraud threads ntawm tus txiv neej haum. Cov xov feem ntau yog coated nrog ib tug xov sealant, xws li teflon daim kab xev los yog yeeb nkab dope, kom ntseeg tau tias muaj kev ruaj ntseg kev twb kev txuas uas tsis muaj paug.
FIP Xov
Poj Niam Hlau Yeeb Nkab (FIP) threads, tseem hu ua Poj Niam Lub Tebchaws Pipe Threads (FNPT), yog lwm hom xov siv hauv cov kav dej. FIP threads yog cov xov ncaj, txhais tau hais tias txoj kab uas hla ntawm cov xov tseem zoo ib yam thoob plaws qhov haum. Tsis zoo li NPT xov, FIP threads tsis taper, uas tuaj yeem ua rau lawv yooj yim rau kev sib txuas thiab txiav.
FIP threads muaj nyob rau ntawm poj niam fittings, xws li couplings los yog lub luj tshib, thiab feem ntau yog siv los txuas rau cov kav dej los yog txiv mis nrog txiv neej NPT threads. Raws li nrog NPT threads, FIP threads feem ntau coated nrog ib tug xov sealant kom muaj kev ruaj ntseg thiab tsis muaj kev sib txuas.
Qhov txawv
Qhov sib txawv tseem ceeb ntawm NPT thiab FIP xov yog lawv tsim. NPT threads yog tapered thiab siv rau txiv neej fittings, thaum FIP threads ncaj thiab siv rau poj niam fittings.
Lwm qhov txawv yog lawv compatibility. NPT threads yog sib xws nrog lwm cov NPT threads, thaum FIP threads yog sib xws nrog lwm FIP threads. Txhawm rau txuas tus txiv neej NPT haum rau FIP poj niam haum, yuav tsum muaj lub adapter nrog NPT thiab FIP xov.
Thaum Yuav Siv NPT lossis FIP Xov Tooj
Kev xaiv ntawm NPT lossis FIP xov yog nyob ntawm daim ntawv thov cov kav dej tshwj xeeb. NPT threads feem ntau yog siv rau hauv cov ntawv siv roj lossis kua uas yuav tsum tau muaj lub foob kaw ntom nti, xws li hauv cov kav dej lossis cov tshuab. FIP threads feem ntau siv hauv cov ntawv thov dej, xws li txuas lub taub hau da dej lossis faucet.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias NPT threads tsis pom zoo rau cov khoom siv yas, vim cov xov tuaj yeem ua rau cov khoom puas. Hauv cov xwm txheej no, FIP threads yog qhov kev xaiv zoo dua vim tias lawv tsis tshua muaj kev puas tsuaj.
Xaus
Hauv cov ntsiab lus, NPT thiab FIP xov yog ob hom xov siv hauv cov kav dej. NPT threads yog tapered thiab siv rau txiv neej fittings, thaum FIP threads ncaj thiab siv rau poj niam fittings. Qhov kev xaiv ntawm NPT lossis FIP xov yog nyob ntawm daim ntawv thov cov kav dej tshwj xeeb thiab kev sib raug zoo, thiab nws yog ib qho tseem ceeb uas yuav tsum tau siv hom xov tsim nyog kom tsis txhob muaj kev puas tsuaj thiab ua kom muaj kev sib txuas ruaj ntseg.