Yog, Threaded Joints yuav tsum tau sealant
Nyob rau hauv yuav luag tag nrho cov dej num scenarios,tooj dag fittingsnrog tapered threads xav tau ib tug sealant. Cov hlau -rau- hlau tiv tauj ntawm NPT (National Pipe Taper) threads tsis watertight los ntawm nws tus kheej. Lub sealant ua rau lub microscopic kauv xau txoj kev ntawm cov xov crests thiab cov hauv paus hniav.
Kev ua haujlwm ntawm Teflon daim kab xev
Teflon daim kab xev (PTFE) ua raws li ob qho tib si roj nplua nyeem thiab qhov sib txawv. Nws tso cai rau cov xov tooj dag tig mus ntxiv thiab nruj dua, tsim kom muaj kev cuam tshuam sib sib zog nqus. Cov mos mos polymer compresses rau hauv xov kwj hav, thaiv txoj kev rau cov dej molecules. Yog tsis muaj nws, qhov sib koom tes yuav xau nyob rau hauv siab.
Qhov txawv ntawm Standard thiab Gas daim kab xev
Txheem dawb PTFE daim kab xev yog rau kev siv dej dav dav. Daj PTFE daim kab xev yog thicker thiab denser, tshwj xeeb tshaj yog nyob rau cov roj kab. Txawm hais tias koj tuaj yeem siv daim kab xev daj ntawm cov kab dej rautooj dag fittings, tsis txhob siv daim kab xev dawb ntawm cov kab roj. Daim kab xev dawb yog nyias dhau los kaw cov roj molecules tsis muaj zog.
Kev Taw Qhia Wrapping Zoo
Qhov no yog ib qho yuam kev ntau zaus. Qhwv daim kab xev nyob rau hauv cov kev taw qhia ntawm threads. Yog tias koj tuav qhov haum nrog lub txiv mis taw rau sab xis, qhwv daim kab xev clockwise. Thaum koj ntsia lub txiv ntseej, qhov kev sib txhuam rub daim kab xev kom nruj. Wrapping counter-clockwise yuav ua rau cov txiv ntseej thawb daim kab xev tawm ntawm cov xov.
Muaj pes tsawg daim ntaub yog raug
Rau qhov loj me ntawm thaj chaw (1/2-inch txog 3/4-nti tooj dag), siv 3 mus rau 5 qhwv. Rau 1-nti mus rau 2-inch diameters, txuas mus rau 5 mus rau 7 qhwv. Tsis txhob overwrap.
Lwm txoj kev: Pipe Joint Compound (Pib Dope)
Cov yeeb nkab sib txuas ua ke yog ib qho kev xaiv zoo tshaj plaws rau daim kab xev. Nws yog ib qho muab tshuaj txhuam nrog txhuam. Ib txoj kev tshawb fawb tau xaus lus tias cov tebchaw yog "me ntsis tiv thaiv kom xau" dua li daim kab xev, txawm tias daim kab xev kuj ua tau zoo.Brass yeeb nkab fittingskaw nrog dope yog ib txwm muaj rau siab -kev co ib puag ncig zoo li lub twj tso kua mis, vim tias cov tshuaj nplaum tseem hloov tau.
Kev pheej hmoo ntawm Hydraulic Cracking
Overtightening los yog siv daim kab xev ntau dhau ua rau "hydraulic wedge." Lub tooj dag haum nthuav dav los ntawm sab hauv. Hnub los yog lis piam tom qab, cov plaub hau tawg tshwm. Qhov tshwm sim yog qeeb qeeb hauv ib phab ntsa. Tiv thaiv qhov no los ntawm kev siv lub zog nruab nrab. Nres thaum koj xav tias muaj zog tiv thaiv, thiab tsis txhob yuam kom haum ib qho ntxiv.
Thaum twg koj yuav tsum tsis txhob siv daim kab xev
Flare fittings yog tsim los rau hlau-ntawm-hlau kov. Lub ntsej muag 45-degree flared ntawm tooj dag yog dab tsi tsim lub foob. Yog tias koj muab Teflon daim kab xev rau ntawm notooj dag fittings, daim kab xev yuav tiv thaiv qhov flare los ntawm kev zaum kom raug. Lub lubricating zoo kuj tseem tso cai rau koj hla dhau - lub zog ntawm lub txiv ntoo, uas yuav ua rau cov tooj dag haum ua ntej nws kaw.
Tshwj xeeb Case: Hauv av Joint Unions
Brass av sib koom koom ua ke tsis xav tau sealant. Lub foob yog tsim los ntawm tooj dag- mus rau - tooj dag machined lub rooj. Lub xauv loj loj uas tuav lub koom haum ua ke yuav tsum tau oiled los yog lubricated los tiv thaiv galling, tab sis tsis txhob muab Teflon daim kab xev rau ntawm lub union ntsej muag.
Qhov "Dry Fit" Risk
Muaj ib lub tsev kawm ntawv me me ntawm kev xav uas hais txog qhov tseeb machined threads "yuav tsum tsis" xav tau daim kab xev. Qhov no yog cuav rau cov kav dej. Ib txoj kev tshawb fawb tau sau tseg tias txawm tias lubricants ib leeg yuav ploj mus thaum lub fittings nruj nreem. Tsis txhob pheej hmoo cov dej xau kom txuag tau 30 vib nas this ntawm lub sijhawm qhwv.
Compatibility nrog Aggressive Fluids
PTFE (Teflon) yog tshuaj inert. Nws yog sib xws nrog txhua yam dej zoo, suav nrog cov tshuaj chlorine siab lossis dej acidic.Brass yeeb nkab fittingskaw nrog daim kab xev muaj kev nyab xeeb rau cov dej haus.
Threaded Yas Fittings
Yog tias koj txuas lub tooj dag haum rau cov poj niam yas haum, tsis txhob cia siab rau daim kab xev los tiv thaiv kev puas tsuaj. Yas (PVC / CPVC) yog softer dua tooj dag. Daim kab xev yuav tsis tiv thaiv cov yas los ntawm kev tawg. Koj yuav tsum txo koj lub zog kom tsawg lossis siv cov yas tshwj xeeb- rau- tooj dag hloov pauv haum.
Cov ntsiab lus
Brass yeeb nkab fittingsxav tau xov sealant rau tag nrho cov tapered (NPT) threads . 3-5 wraps ntawm PTFE daim kab xev siv clockwise yog tus qauv qauv. Tsis txhob siv daim kab xev rau ntawm cov khoom siv hluav taws xob lossis lub rooj sib koom ua ke. Kev zam tsis tshua muaj. Ib qho kev sib koom ua ke qhuav yuav luag yuav xau. Ua raws li cov cai no ua kom muaj kev sib raug zoo- nruj rau ntau xyoo.
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