Yuav kom siv tau zoo PTFE hauv a axial split case twj tso kua mis , nws yog ib qho tseem ceeb kom nkag siab txog cov khoom ntawm cov khoom no. Qee qhov tshwj xeeb ntawm PTFE ua rau nws yog cov khoom siv zoo heev rau kev ntim khoom braided:

1. Cov tshuaj tiv thaiv zoo heev. Ib qho laj thawj tseem ceeb ntawm kev siv PTFE hauv kev ntim khoom yog tias nws tsis cuam tshuam los ntawm ntau yam corrosive kua, nrog rau cov kua qaub muaj zog, cov hauv paus, thiab cov kuab tshuaj. Tej zaum qhov tseem ceeb tshaj plaws, PTFE tuaj yeem tiv taus cov oxidizing muaj zog xws li nitric acid, chlorine dioxide, thiab cov concentrated sulfuric acid (oleum).

2. Tsawg coefficient ntawm kev sib txhuam thaum sib cuag nrog ntau qhov chaw. PTFE paub tias muaj cov tsis ntub dej, du, thiab qis coefficient ntawm kev sib txhuam. Qhov no pab txo qis kev siv hluav taws xob thiab hluav taws xob tsim hluav taws xob ntawm cov khoom ntim-ncej interface.

Thaum PTFE muaj nws qhov zoo, qee qhov ntawm nws cov khoom tsis zoo tagnrho hauv ntau daim ntawv thov ntim cov twj tso kua mis. Cov teeb meem ntsib nrog PTFE packing feem ntau yog vim nws tsis zoo thermal thiab mechanical zog:

1. Txias deformation los yog creep nyob rau hauv siab. Creep nce nrog nce kub. Thaum lub siab yog siv rau 100% PTFE packing rau ib lub sij hawm ntawm lub sij hawm, lub packing tej zaum yuav ua ib tug ntom ntom ntom thiab yuav tsum tau hloov ntau zaus los tuav lub foob. Nws kuj tseem muaj lub siab xav nyem tawm sab saum toj thiab hauv qab qhov khoob ntawm lub thawv ntim khoom ntawm a axial split case twj tso kua mis.

2. Tsawg thermal conductivity. Thaum kev sib txhuam cov cua sov yog tsim nyob rau hauv kev sib cuag nrog lub siab ceev rotating ncej, ntshiab PTFE muaj ib tug nyiam nqus cua sov thiab tsis muaj peev xwm mus dissipate nws mus rau ib puag ncig ib puag ncig. Txhawm rau tiv thaiv PTFE packing los ntawm kev kub hnyiab los yog kub hnyiab, yuav tsum muaj qhov xau siab ntawm qhov ntim-ncej nto.

3. High thermal expansion coefficient. Raws li qhov kub thiab txias, PTFE nthuav dav sai dua li cov hlau nyob ib puag ncig. Qhov kev nthuav dav no ua rau kom lub siab ntawm cov ntim ntawm axial split case twj tso kua mis ncej thiab bore.

PTFE Fiber Ntim

Ntau lub tuam txhab tsim cov khoom ntim uas siv PTFE ua lub hauv paus fiber ntau. Cov khoom no tuaj yeem muab tau raws li cov fibers qhuav, fibers coated nrog PTFE dispersions, los yog fibers coated nrog ntau yam lubricants. Nws yog ib qho kev xyaum zoo los siv cov khoom no tsuas yog thaum tsis muaj lwm yam PTFE lwm txoj hauv kev, suav nrog kev siv cov tshuaj corrosive xws li muaj zog oxidizers, lossis rau cov khoom noj lossis cov txheej txheem tshuaj.

Rau PTFE fiber packing, nws yog ib qho tseem ceeb heev uas yuav tsum tau ua raws li cov chaw tsim tshuaj paus txwv ntawm kub, ceev, thiab siab. Cov packing no rhiab heev rau kev hloov kho thaum siv cov khoom sib hloov. Feem ntau, lub caj pas qis thiab cov pa xau ntau dua yuav tsum muaj dua li lwm cov ntim khoom.

Expanded Polytetrafluoroethylene (ePTFE) Ntim

ePTFE yarns zoo sib xws rau qhov txhab PTFE daim kab xev. Daim ntawv feem ntau yog ePTFE impregnated nrog graphite los txhim kho nws cov thermal conductivity thiab ceev ntsuas. ePTFE braids tsis tshua muaj siab rau cov cua sov tsim dua li PTFE fiber ntau ntim. ePTFE packing tej zaum yuav muaj qhov txias deformation thiab extrusion ntawm siab dua.

PTFE Coated packing

Thaum cov tshuaj tiv thaiv zoo heev ntawm PTFE tsis tas yuav tsum tau, PTFE tuaj yeem coated ntawm ntau cov ntaub ntawv fiber ntau los txhim kho kev ntim khoom thiab coj kom zoo dua cov txiaj ntsig ntawm PTFE. Cov fibers no tseem tuaj yeem pab txo lossis tshem tawm qee qhov tsis muaj zog ntawm cov ntshiab PTFE braids.

Synthetic thiab iav fiber ntau sib xyaw yarns tuaj yeem coated nrog PTFE los tsim kev lag luam, ntau yam ntim khoom uas muaj kev ua haujlwm siab dua, ntau dua extrusion tsis kam, thiab kev sib tw tsawg dua li PTFE fiber ntau braids. Lawv kuj tuaj yeem raug coated nrog cov sib xyaw ua ke ntawm PTFE thiab graphite txhawm rau txhim kho lub braid lub peev xwm ceev thiab cov yam ntxwv ntawm cov cua sov dissipation.

Aramid fiber packing nrog PTFE coatings yuav siv tau qhov twg hnyav hnyav yuav tsum tau. Novoid fiber packing nrog PTFE txheej yuav siv tau nyob rau hauv me me corrosive cov kev pab cuam thiab muaj zoo resilience thiab extrusion tsis kam tshaj PTFE fiber braids.

PTFE-coated carbon thiab graphite fiber braids yog ib qho ntawm cov khoom siv ntau yam. Lawv muaj cov tshuaj tiv thaiv zoo heev (tshwj tsis yog cov tshuaj oxidizing muaj zog), kev ua haujlwm siab ceev, kev ua haujlwm kub, thiab ua haujlwm zoo heev. Lawv tsis zoo li soften los yog extrude ntawm qhov kub thiab txias thiab kuj muaj kev puas tsuaj zoo.

Los ntawm kev nkag siab txog qhov zoo thiab kev txwv ntawm ntau hom braided PTFE packing, koj tuaj yeem xaiv cov khoom uas yuav ua tau raws li koj qhov axial split case twj lossis valve txheej txheem sealing.