Qhov txawv ntawm NPT thiab MPT yog dab tsi?
Taw qhia:
Hauv thaj chaw ntawm cov kav dej thiab fittings, muaj ntau lub ntsiab lus thiab cov ntawv luv uas siv los piav txog ntau hom kev sib txuas. Ib qho tsis meej pem tshwm sim thaum tham txog NPT thiab MPT fittings. Cov ntawv luv no sawv cev rau National Pipe Thread thiab Txiv Neej Pipe Thread, feem. Txawm hais tias lawv yuav zoo li zoo sib xws, muaj qhov sib txawv ntawm ob. Tsab ntawv xov xwm no yog tsom rau qhov pom ntawm qhov tsis sib xws ntawm NPT thiab MPT, muab kev nkag siab zoo ntawm lawv cov haujlwm thiab kev siv.
1. Xov Tsim:
Thawj qhov sib txawv ntawm NPT thiab MPT yog nyob rau hauv lawv cov xov tsim. NPT fittings muaj cov xov tapered, kuj hu ua yeeb nkab xov. Qhov kev tsim no tso cai rau lub kaw ntom nti los ntawm kev tsim kev cuam tshuam ntawm cov txiv neej thiab poj niam xov. Raws li cov fittings tau nruj, cov threads compressed ua ke, tsim ib qho kev sib txuas-resistant.
Ntawm qhov tod tes, MPT fittings muaj cov xov ncaj tsim, tseem hu ua cov xov sib txuas. Tsis zoo li NPT fittings, MPT kev sib txuas tsis cia siab rau kev cuam tshuam ntawm cov xov rau kev ruaj ntseg foob. Hloov chaw, lawv siv cov txheej txheem sab nraud, xws li xov sealant lossis lub gasket, los tiv thaiv kev xau.
2. Kev siv: **
** NPT:
NPT fittings feem ntau yog siv rau hauv cov kav dej, tshwj xeeb tshaj yog rau kev koom nrog cov kav dej thiab fittings uas nqa cov kua los yog roj. Lawv tau siv dav hauv cov kav dej hauv tsev, cov tshuab ua haujlwm, cov khoom siv hydraulic, thiab cov tshuab pneumatic. Cov xov tapered tsim ntawm NPT ua kom muaj kev sib khi nruj, ua rau nws haum rau kev siv siab thiab kub kub.
MPT:
MPT fittings, los yog txiv neej yeeb nkab xov fittings, feem ntau yog siv los txuas nrog poj niam yeeb nkab xov fittings rau ntau yam kev siv. Lawv feem ntau pom muaj nyob rau hauv cov kav dej, cua compressors, twj tso kua mis, thiab lwm yam khoom siv. Txoj xov ncaj tsim ntawm MPT fittings tso cai rau kev yooj yim installation thiab disassembly, ua rau lawv yooj yim rau cov ntawv thov uas nquag tu yuav tsum tau ua.
3. Compatibility: **
** NPT:
NPT fittings tsis sib haum nrog MPT fittings vim qhov sib txawv ntawm cov xov tsim. Kev sim txuas NPT thiab MPT fittings ncaj qha tuaj yeem ua rau xau thiab ua haujlwm tsis zoo. Yog li ntawd, nws yog ib qho tseem ceeb los xyuas kom meej tias cov xov ntawm ob qho tib si fittings ua ntej sim koom nrog lawv.
Txawm li cas los xij, nws tsim nyog hais tias NPT fittings tuaj yeem txuas nrog poj niam NPT threads yooj yim vim lawv cov qauv tsim. Qhov kev sib raug zoo no tso cai rau cov kav dej ntau yam thiab kev sib txuas hauv NPT systems.
MPT:
Ib yam li ntawd, MPT fittings tsis sib haum nrog NPT fittings. Txawm li cas los xij, lawv tuaj yeem txuas tau yooj yim rau poj niam MPT xov. Txoj xov ncaj tsim ntawm MPT fittings tso cai rau kev sib txuas ncaj nraim, ua kom muaj kev ruaj ntseg thiab tsis muaj kev sib koom ua ke.
4. Txoj kev sealing:**
** NPT:
Raws li NPT fittings cia siab rau taper thiab cuam tshuam ntawm cov txiv neej thiab poj niam xov, lawv feem ntau muab lub foob yam tsis muaj kev sib khi ntxiv. Txawm li cas los xij, rau cov ntawv thov tseem ceeb lossis thaum koom nrog ob tus txiv neej NPT fittings, kev siv xov sealant, xws li Teflon daim kab xev lossis yeeb nkab dope, tau pom zoo. Cov txheej txheem kev sib khi no txhim kho cov dej tsis sib haum ntawm kev sib txuas, tshwj xeeb tshaj yog nyob rau hauv high-pressure systems.
MPT:
Tsis zoo li NPT fittings, MPT kev sib txuas yuav tsum tau siv txoj kev sib khi ntxiv los xyuas kom muaj kev sib khi zoo. Xov sealant, xws li Teflon daim kab xev los yog yeeb nkab dope, feem ntau yog siv rau cov txiv neej threads ua ntej kev sib txuas. Cov sealant no ua raws li kev thaiv, tiv thaiv kom tsis txhob tawm thiab txhim kho tag nrho kev ntseeg siab ntawm kev sib koom ua ke.
5. Standardization: **
** NPT:
NPT yog tus qauv tsim xov tooj. Nws ua raws li cov kev qhia tshwj xeeb uas tau teev tseg los ntawm American National Standard Pipe Thread, tseem hu ua ANSI / ASME B1.20.1. Cov qauv no ua kom muaj kev sib xws hauv xov qhov ntev, suab, thiab lub kaum sab xis, tso cai rau kev sib raug zoo ntawm NPT fittings.
MPT:
Tsis zoo li NPT, MPT tsis yog tus qauv tsim xov. Hloov chaw, nws hais txog txiv neej cov yeeb nkab threads feem ntau. Qhov tsis muaj kev tsim qauv tuaj yeem ua rau muaj qhov sib txawv ntawm cov xov qhov ntev thiab cov kaum sab xis, ua rau nws tseem ceeb heev kom ntseeg tau tias muaj kev sib raug zoo ua ntej txuas MPT fittings.
Xaus:
Hauv cov ntsiab lus, qhov sib txawv tseem ceeb ntawm NPT thiab MPT yog nyob rau hauv lawv cov xov tsim, kev siv, kev sib raug zoo, kev sib khi, thiab kev tsim qauv. NPT fittings siv cov xov xov tapered tsim, muab lub kaw ntom ntom yam tsis muaj kev sib khi ntxiv. Lawv feem ntau ua haujlwm hauv cov kav dej thiab cov ntawv thov kev lag luam uas yuav tsum tau muaj kev sib txuas tsis zoo. Ntawm qhov tod tes, MPT fittings muaj ib txoj xov ncaj tsim thiab yuav tsum tau siv cov xov sealant rau lub foob zoo. Lawv feem ntau yog siv los txuas nrog poj niam cov yeeb nkab threads.
Kev nkag siab txog qhov sib txawv ntawm NPT thiab MPT fittings yog qhov tseem ceeb los xyuas kom meej cov kav dej tsim nyog thiab tiv thaiv kev xau lossis teeb meem. Los ntawm kev txiav txim siab qhov sib txawv no, tib neeg tuaj yeem xaiv qhov tsim nyog haum rau lawv cov kev xav tau tshwj xeeb thiab tswj cov tshuab ua haujlwm tau zoo.