Kub kub PTFE gasket durability? 

Cia peb ua tiag tiag, thaum ib tug neeg nug txog lub siab kub PTFE gasket durability, lawv feem ntau yog picturing lub khawv koob foob uas tuav 500 ° F mus ib txhis. Nov yog thawj qhov chaw uas peb tau nce mus. PTFE zoo heev, tab sis siab kub yog txheeb ze, thiab kav ntev nyob ntawm seb koj tab tom thov nws ua dab tsi. Puas yog nws txuas ntxiv thermal cycling? Puas muaj tshuaj lom neeg nyob rau saum lub tshav kub? Los yog nws tsuas yog zoo li qub, kub flange? Cov lus teb hloov txhua yam.

Lub Siab Temp Misconception thiab Material Reality

Ntshiab PTFE pib nkag mus rau saum 400 ° F (ib ncig 204 ° C). Koj tuaj yeem pom cov ntaub ntawv hais tias nws siv tau txog 500 ° F (260 ° C), thiab technically, nws yuav tsis yaj tam sim ntawd. Tab sis ntawm cov kev txwv saum toj no, nws lub cev muaj zog soften. Lub gasket tuaj yeem txias txaus, txhais tau tias nws maj mam deforms nyob rau hauv bolt load, ua rau kom muaj kev ntxhov siab so thiab nws thiaj li to. Yog li, durability ntawm 250 ° C yog ib lo lus nug ntawm lub sij hawm thiab siab, tsis yog ib qho yooj yim yog / tsis.

Kuv nco qab txog ib qhov project ntawm cov kab tshuaj lom neeg nrog kev sib cais chav huv. Qhov kub yuav nce mus txog 230 ° C rau lub sijhawm luv. Peb siv a PTFE gasket, thiab nws ua haujlwm… li ntawm peb lub hlis. Tom qab ntawd cov dej xau pib ntawm qhov bolts. Qhov teeb meem tsis yog qhov kub siab tshaj plaws rau ib tus se, tab sis qhov rov qab thermal cycles ua ke nrog flange rotation thaum bolting. Cov ntaub ntawv poob nws resilience.

Yog vim li cas cov qhab nia PTFE tau sau rau hauv kev ua si. Cov ntaub ntawv zoo li iav-filled lossis carbon-filled PTFE txhim kho creep kuj tseem ceeb. Lawv tuaj yeem tuav cov khoom siv ntau dua ntawm qhov kub siab, ua rau lub neej ua haujlwm ntev. Tab sis txawm li ntawd los, koj pauv qee qhov ntshiab PTFE cov tshuaj tiv thaiv zoo heev. Nws yeej ib txwm muaj kev sib haum xeeb.

Kev Ua Tsis Taus Koj Tsuas Kawm Los Ntawm Kev Pom

Dhau li creep, tus tua neeg loj yog thermal degradation. Kev raug ncua ntev ntawm qhov kawg ntawm qhov kub thiab txias ua rau PTFE ua nkig. Nws tsis yaj; nws pib tawg, tshwj xeeb tshaj yog thaum kaw thaum tej yam txias. Koj yuav pom lub gasket tawg ua tej daim thaum koj qhib lub flange.

Lwm qhov hloov maj mam yog qhov flange nto tiav. Ntawm cov kev pabcuam kub kub, ib qho serrated tiav yuav raug teev kom zoo dua tom. Tab sis nrog cov khoom muag zoo li PTFE, cov serrations tuaj yeem txiav rau hauv lub gasket lub sij hawm, tshwj xeeb tshaj yog thaum lub sij hawm thermal expansion/contraction cycles. Kuv tau hloov mus rau lub kauv-qhov txhab gasket nrog PTFE muab tub lim rau cov xwm txheej zoo li no, qhov twg cov hlau windings coj cov neeg kho tshuab tom, thiab PTFE muab lub foob. Zoo dua durability.

Siab yog lwm ib nrab ntawm qhov sib npaug. Ib qhov kub-kub, tsis tshua muaj cua kub kab yuav cia PTFE gasket xyoo tas los. Qhov kub tib yam nrog kev kub siab sab hauv, tshwj xeeb tshaj yog tias nws yog cyclic, yuav ua rau nws lub neej luv heev. Lub load ntawm lub ntsej muag gasket yog hloov pauv tas li, ua haujlwm ntawm cov khoom siv.

Tswv yim xaiv thiab installation Pitfalls

Gasket thickness tseem ceeb tshaj li cov neeg xav. Rau high-temps apps, kuv nyiam mus thinner. Lub 1.5mm gasket muaj cov khoom siv tsawg dua los nkag thiab distort dua li 3 hli. Nws kuj yuav tsum tau ntau dua bolt load rau ntim thawj zaug, uas ua rau qhov tseem ceeb tshaj plaws: txheej txheem bolting.

Yog tias koj tsis tau txais lub ntsia liaj qhov rooj txij thaum pib, tsis nco qab txog lub sijhawm ntev siab kub kev ua tau zoo. Nyob rau hauv-torquing, thiab thawj lub foob tsis zoo. Tshaj-torquing, thiab koj tau compressed lub PTFE tshaj li rov qab, accelerating creep. Kev siv lub calibrated torque ciaj ntswj thiab ib qho kev sib dhos kom zoo sib xws tsis yog kev xyaum zoo xwb; nws yog qhov sib txawv ntawm lub gasket kav ib xyoos lossis peb.

Peb kawm qhov no txoj kev nyuaj ntawm lub txhab nyiaj ntawm cov khoom siv hluav taws xob. Pab neeg saib xyuas tau siv qhov cuam tshuam rau kev ceev. Cov gaskets (ib hom PTFE reinforced) tawg tawm hauv lub lis piam ntawm kev ua haujlwm kub. Qhov tsis sib xws, hnyav dhau los tsim cov ntsiab lus kev ntxhov siab hauv cheeb tsam uas cov cua sov ua tiav.

Thaum Yuav Siv Nws Thiab Thaum Yuav Taug Kev

Yog li, qhov twg yog qhov kub siab PTFE gasket ua rau kev nkag siab? Rau kev pabcuam tas mus li, kuv yuav tsum ceev faj tshaj 200 ° C tshwj tsis yog tias nws yog qib puv thiab lub siab qis. Nws qhov chaw qab zib yog nyob rau hauv kev pabcuam corrosive qhov twg qhov kub thiab txias yog nruab nrab, tab sis cov tshuaj tau txiav txim tawm feem ntau elastomers. Piv txwv li, kub acid ntws ntawm 150-180 ° C.

Rau qhov tseeb qhov kub thiab txias, siab flanges, zoo li hauv lub zog tsim, koj tab tom saib graphite, kauv-qhov txhab, lossis lub nplhaib-hom pob qij txha. PTFE tsis yog tus neeg ua si nyob ntawd. Kuv tau pom specs los ntawm engineering tuam txhab uas muag dig muag hu rau PTFE rau corrosion kuj ntawm 280 ° C kab, thiab nws yog ib daim ntawv qhia rau ib tug kaw. Koj yuav tsum thawb rov qab nrog cov khoom txwv.

Qee zaum, kev daws teeb meem yog txheej. Ib qhov project kuv tau ua haujlwm nrog ib tus neeg muag khoom nyiam HANDAN ZITAI FREWER RAUG UA MOV., Ltd. (lawv nyob hauv Yongnian, lub hub loj loj hauv Hebei, koj tuaj yeem nrhiav tau ntawm Zitaifasteners.com) koom nrog tsis yog lub gasket nkaus xwb tab sis tag nrho cov bolting system. Peb xav tau cov bolts muaj zog uas tuaj yeem tswj xyuas qhov kub thiab txias kom lub PTFE gasket ua haujlwm. Nws yog ib qho system, tsis yog ib qho kev sib cais.

Lub Sijhawm Saib Xyuas Ntev thiab Lwm Txoj Haujlwm

Durability yog qhov kawg ntawm tag nrho cov nqi. Ib tug pheej yig PTFE gasket uas tsis nyob rau hauv 6 lub hlis nqi ntau dua nyob rau hauv lub zog thiab downtime dua ib tug kim dua kauv-qhov txhab gasket uas kav 5 xyoo. Koj yuav tsum tau ua qhov tseem ceeb ntawm kev saib xyuas lub sijhawm thiab qhov tseem ceeb ntawm txoj kab.

Rau kev hloov pauv hauv flanges uas twb muaj lawm, ib txwm ntsuas qhov sib txawv ntawm kev ua haujlwm kub yog tias koj tuaj yeem ua tau. qub flanges warp. Lub gasket koj nruab txias yuav tsum kaw kub, nyob rau hauv ib tug distorted geometry. Qee zaum, qhov kev xaiv ruaj khov tshaj plaws yog kho lub flange ua ntej.

Thaum kawg, teb yuam kom koj nug kaum ob nqe lus nug ntxiv. Dab tsi yog qhov ntsuas kub qhov profile? Qhov nruab nrab yog dab tsi? Dab tsi yog qhov flange mob thiab bolting? Tsis muaj ib lo lus teb, tsuas yog ib txheej ntawm kev lag luam tawm raws li kev paub dhau los - thiab qee zaum, ntawm kev ua tsis tiav yav dhau los. Lub hom phiaj tsis yog mus ib txhis; nws yog rau lub sijhawm kwv yees, txhim khu kev qha kev pabcuam uas koj tuaj yeem npaj ib puag ncig. Thiab rau qhov ntawd, kev nkag siab txog cov khoom siv lub ntiaj teb kev txwv yog tib yam uas ua haujlwm.