Xov foob daim kab xev (tseem hu ua PTFE daim kab xev los yog cov kav dej cov kab xev) yog polytetrafluoroethylene (PTFE) zaj duab xis siv rau hauv sealing yeeb nkab threads. Cov kab xev yog muag txiav rau qhov dav dav thiab qhov txhab ntawm ib lub spool, ua rau nws yooj yim rau cua ncig cov yeeb nkab threads. Nws tseem paub los ntawm cov khoom lag luam-lub npe Teflon daim kab xev; Thaum Teflon yog qhov tseeb zoo ib yam rau PTFE, Chemours (tus tuav lub cim lag luam) xav txog qhov kev siv no tsis raug, tshwj xeeb tshaj yog vim lawv tsis tsim Teflon hauv daim kab xev lawm.Thread seal daim kab xev lubricates tso cai rau lub rooj sib sib zog nqus ntawm cov xov, thiab nws pab tiv thaiv Cov threads los ntawm kev ntes thaum tsis muaj screwed.Cov kab xev kuj ua haujlwm raws li ib qho deformable muab tub lim thiab xov roj nplua nyeem, pab txhawm rau txhawm rau sib koom ua ke yam tsis muaj qhov tawv tawv lossis ua rau nws nyuaj rau zawm, thiab es tsis txhob ua kom nws yooj yim rau zawm.
Feem ntau cov kab xev yog qhwv ib ncig ntawm ib lub yeeb nkab xov peb zaug ua ntej nws yuav tsum tau screwed rau hauv qhov chaw. Nws yog feem ntau siv hauv kev lag luam hauv cov ntawv thov suav nrog cov tshuab dej siab, lub tshuab cua sov hauv nruab nrab, thiab cov khoom siv cua compression.
Hom
Xov foob daim kab xev feem ntau yog muag nyob rau hauv me me spools.
Muaj ob txoj hauv kev hauv Teb Chaws Asmeskas los txiav txim siab qhov zoo ntawm PTFE daim kab xev. MIL-T-27730A (ib qho kev ua tub rog uas tsis siv lawm tseem niaj hnub siv hauv kev lag luam hauv Teb Chaws Asmeskas) yuav tsum muaj qhov tsawg kawg nkaus thickness ntawm 3.5 mils thiab qhov tsawg kawg nkaus PTFE purity ntawm 99%. thickness yuav tsum tau ntawm MIL-T-27730A thiab ntxiv ib tug tsawg kawg nkaus ceev ntawm 1.2 g / cm3.Relevant qauv yuav sib txawv ntawm kev lag luam; daim kab xev rau cov khoom siv roj (rau UK cov cai tswj kev siv roj) yuav tsum ua kom tuab dua li cov dej. Txawm hais tias PTFE nws tus kheej yog qhov tsim nyog rau kev siv cov pa oxygen siab, qib ntawm daim kab xev yuav tsum paub tias tsis muaj roj.
Xov foob daim kab xev siv hauv cov kav dej siv feem ntau yog xim dawb, tab sis nws kuj muaj ntau yam xim. Nws yog feem ntau siv los sib piv cov xim coded pipelines (US, Canada, Australia thiab New Zealand: daj rau natural gas, ntsuab rau oxygen, thiab lwm yam). Cov xim-codes rau xov sealing daim kab xev tau qhia los ntawm Bill Bentley ntawm Unasco Pty Ltd nyob rau hauv 1970s. Nyob rau hauv UK, daim kab xev yog siv los ntawm cov xim reels, xws li daj reels rau roj, ntsuab rau potable dej.
Dawb - siv rau ntawm NPT xov mus txog 3/8 nti
Daj - siv rau ntawm NPT threads 1/2 nti rau 2 nti, feem ntau sau lo lus "gas daim kab xev"
Paj yeeb - siv rau ntawm NPT xov 1/2 nti rau 2 nti, nyab xeeb rau propane thiab lwm yam hydrocarbon fuels
Ntsuab - tsis muaj roj PTFE siv rau ntawm cov pa oxygen thiab qee qhov kev kho mob gasses
Grey - muaj cov npib tsib xee, tiv thaiv kev ntes, tiv thaiv kev yaig thiab tiv thaiv corrosion, siv rau cov kav dej stainless
Copper - muaj tooj liab granules thiab tau ntawv pov thawj raws li ib tug xov lubricant tab sis tsis yog ib tug sealer
Hauv Tebchaws Europe BSI tus qauv BS-7786: 2006 qhia ntau qib thiab cov qauv zoo ntawm PTFE xov sealing daim kab xev.
Post lub sij hawm: Apr-04-2017