To taub PTFE vs.Viton Seals: Kev Tiv Thaiv Tshuaj

Kev Taw Qhia

Kev xaiv ntawm PTFE thiab Viton cov ntsaws ruaj ruaj cuam tshuam ntau dua li qhov haum yooj yim: nws txiav txim siab seb lub kaw lus tiv taus cov tshuaj lom neeg, cua sov, siab, thiab lub voj voog ua haujlwm ntev npaum li cas. Rau cov ntawv thov uas muaj cov xov xwm hnyav, Viton feem ntau raug txiav txim siab rau nws qhov muaj zog tiv taus tshuaj lom neeg thiab thermal, tab sis nws qhov kev ua tau zoo nyob ntawm cov kua dej, qhov kub thiab txias, thiab kev xav tau kho tshuab. Tsab xov xwm no piav qhia txog qhov twg Viton cov ntsaws ruaj ruaj ua tau zoo, qhov twg PTFE yuav yog qhov kev xaiv zoo dua, thiab qhov twg pauv pauv tseem ceeb tshaj plaws hauv kev pabcuam tiag tiag. Thaum kawg, cov nyeem ntawv yuav muaj lub hauv paus meej dua rau kev sib piv kev sib raug zoo, kev ruaj khov, thiab kev pheej hmoo ua tsis tiav ua ntej txav mus rau hauv cov txheej txheem xaiv cov ntaub ntawv ntxaws.

Vim li cas PTFE vs. Viton Seals thiaj tseem ceeb

Hauv qhov tseem ceebkev siv rau kev lag luam, qhov kev qhia tshwj xeeb ntawm cov ntaub ntawv sealing ncaj qha qhia txog kev ntseeg tau ntawm lub kaw lus, kev nyab xeeb, thiab kev ua haujlwm ntev. Cov kws ua haujlwm uas muaj lub luag haujlwm tswj cov kua dej yuav tsum tau soj ntsuam qhov zoo sib piv ntawm fluoropolymers thiab fluoroelastomers, tshwj xeeb tshaj yog thaum cuam tshuam nrog cov xov xwm hnyav thiab cov xwm txheej kub heev. Kev txiav txim siab ntawm PTFE thiab Viton seals tsis yog tsuas yog teeb meem ntawm kev sib raug zoo ntawm cov tshuaj lom neeg xwb; nws yog kev xaiv engineering nyuaj uas cuam tshuam rau tag nrho cov qauv tsim.

Kev xaiv cov khoom siv sealing tsis raug tuaj yeem ua rau muaj kev xau loj heev, kev ua qias tuaj rau ib puag ncig, thiab kev poob nyiaj txiag loj heev. Kev nkag siab txog cov khoom siv tseem ceeb thiab cov cwj pwm kho tshuab ntawm ob lub polymers no ua kom ntseeg tau tiascov txheej txheem tswj cov kua dejua haujlwm nyob rau hauv lawv cov ciam teb kev nyab xeeb tsim.

Kev sib raug zoo ntawm cov xov xwm, qhov kub thiab txias, thiab lub sijhawm ua haujlwm

Kev sib raug zoo ntawm cov xov xwm thiab kev kam rau qhov kub thiab txias yog cov tsav tsheb tseem ceeb hauv cov lus qhia txog kev foob. Thaum cov foob raug rau cov tshuaj tsis sib xws, lawv dhau los ua volumetric swell, embrittlement, lossis yaj, ua rau lub sealing interface puas tsuaj. Ib yam li ntawd, kev ua haujlwm sab nraum cov khoom siv thermal envelope ua rau cov polymer degradation sai dua. Hauvkev lag luam ua tshuaj lom neeg, lub sijhawm tsis tau npaj tseg vim yog lub foob tsis ua haujlwm tuaj yeem ua rau tus nqi ntau dua $ 10,000 ib teev, qhia txog qhov tseem ceeb ntawm kev xaiv cov khoom siv.

Kev ua kom lub sijhawm ua haujlwm tau zoo tshaj plaws yuav tsum tau ua kom cov khoom siv foob ruaj khov nrog rau qhov chaw ua haujlwm. Lub foob yuav tsum tswj nws qhov kev ua haujlwm kom zoo los ntawm kev raug cov kua dej tseem ceeb tas li, nrog rau thaum lub sijhawm ntxuav hnyav lossis ntxuav lub kaw lus, uas feem ntau ua rau muaj cov kuab tshuaj uas ua rau muaj kev cuam tshuam ntau lossis cov pa kub siab uas ua rau lub network polymer ntxhov siab.

Kev sib pauv ntawm kev ua tau zoo thiab cov nqi

Kev yuav khoom ntawmcov ntsaws ruaj ruaj rau kev lag luamcuam ​​tshuam txog kev sib npaug ntawm cov nqi pib ntawm cov khoom sib xyaw nrog rau tag nrho cov nqi ntawm kev muaj (TCO). Cov ntsaws ruaj ruaj Viton feem ntau muaj qhov cuam tshuam qis dua rau kev nkag, feem ntau raug nqi tsawg dua 15% txog 30% los tsim cov khoom ntau dua piv rau lwm cov PTFE uas siv precision-machined. Txawm li cas los xij, qhov kev txuag nyiaj ua ntej no raug tshem tawm sai sai yog tias qhov chaw ua haujlwm hais kom muaj kev hloov pauv ntau zaus, kev siv zog ntau.

Kev pauv pauv kev ua tau zoo tsis yog tsuas yog tus nqi xwb. Txawm hais tias Viton muab kev rov qab zoo dua qub thiab yooj yim dua rau kev teeb tsa yam tsis muaj cov cuab yeej tshwj xeeb, nws cov kev txwv tshuaj lom neeg yuav yuam kom cov engineers teev cov perfluoroelastomers kim dua (FFKM) yog tias tus qauv FKM tsis ua haujlwm. Ntawm qhov tod tes, PTFE xav tau kev txiav txim siab tshwj xeeb txog kev tsim kho vajtse, xws li kev kam rau siab dua thiab cov txheej txheem caij nplooj ntoos hlav muaj zog, uas tuaj yeem ua rau qhov nyuaj thiab tus nqi ntawm kev sib dhos sealing nce ntxiv.

Cov Ntsiab Lus Tseem Ceeb ntawm PTFE thiab Viton Seal

Ob qho tib si polytetrafluoroethylene (PTFE) thiab fluoroelastomers (FKM, uas paub dav los ntawm lub npe lag luam Viton) yog tsim los kom tiv taus cov chaw ua haujlwm nyuaj. Txawm hais tias lawv sib koom ua ke ntawm cov pa roj carbon-fluorine muaj zog, lawv cov qauv molecular sib txawv ua rau muaj cov yam ntxwv sib txawv kiag li.

Kev lees paub qhov sib txawv ntawm cov qauv ntawm thermoplastic fluoropolymer thiab thermoset elastomer yog qhov tseem ceeb rau kev kwv yees seb txhua yam khoom yuav teb li cas rau cov zog compressive, thermal expansion, thiab fluid immersion dhau lub sijhawm ua haujlwm ntev.

PTFE qauv thiab tshuaj inertness

PTFE yog ib hom fluoropolymer uas muaj cov pa roj carbon uas muaj cov fluorine atoms tiv thaiv tag nrho. Cov qauv molecular ntom ntom no tiv thaiv cov tshuaj reagents los ntawm kev tawm tsam cov saw hlau carbon, ua rau PTFE tshiab tsis muaj zog rau yuav luag txhua yam tshuaj lom neeg hauv kev lag luam, tsuas yog cov hlau alkali molten thiab cov fluorine elemental ntawm qhov kub siab.

Nyob rau hauv thermally, PTFE muaj ib qho kev ua haujlwm zoo heev, ua haujlwm tau zoo los ntawm qhov kub thiab txias ntawm -200 ° C txog + 260 ° C. Tsis tas li ntawd, nws cov coefficient ntawm kev sib txhuam yog qhov qis heev - feem ntau ntawm 0.05 thiab 0.10 - ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov ntawv thov khiav qhuav lossis cov kab ke dynamic uas txo qhov kev coj cwj pwm stick-slip thiab txo cov actuator hnav yog qhov tseem ceeb.

Viton chemistry thiab kua tsis kam

Viton yog ib qho fluoroelastomer hluavtaws, feem ntau yog tsim los ntawm cov copolymers ntawm vinylidene fluoride (VDF) thiab hexafluoropropylene (HFP). Tsis zoo li cov qauv crystalline rigid ntawm PTFE, Viton muaj cov saw hlau amorphous, cross-linked polymer. Qhov cross-linking no muab cov khoom siv nws cov roj hmab elasticity, tso cai rau nws deform nyob rau hauv siab los sau cov khoom me me tsis zoo thiab tom qab ntawd rov qab mus rau nws cov duab qub.

Cov qauv Viton txheem muaj kev tiv thaiv zoo heev rau aliphatic thiab aromatic hydrocarbons, roj av, thiab UV degradation. Nws lub qhov rais ua haujlwm thermal feem ntau spans ntawm -20 ° C txog + 200 ° C, nrog rau cov qib tshwj xeeb uas muaj peev xwm tiv taus kev raug mob intermittent txog li 225 ° C. Txawm li cas los xij, qhov muaj cov hydrogen atoms hauv nws cov saw polymer ua rau nws yooj yim rau kev tawm tsam tshuaj los ntawm qee cov kuab tshuaj polar.

Kev Tiv Thaiv Tshuaj thiab Kev Sib Piv Kev Ua Haujlwm

Kev siv cov PTFE thiab Viton seals nyob ntawm lawv cov lus teb rau cov tshuaj lom neeg tshwj xeeb thiab kev ntxhov siab ntawm lub cev. Thaum PTFE muaj kev sib raug zoo nrog cov tshuaj lom neeg ze li ntawm thoob plaws ntiaj teb, Viton ua tau zoo hauv cov ntawv thov uas xav tau lub cim xeeb dynamic thiab lub zog sealing ruaj khov hauv qab kev nias.

Cov kws ua haujlwm yuav tsum soj ntsuam qhov sib xyaw ua ke ntawm cov xov xwm, suav nrog cov khoom ntxiv me me thiab cov neeg ua kom huv, nrog rau qhov xav tau ntawm cov khoom siv kho vajtse kom txiav txim siab cov khoom siv foob zoo tshaj plaws.

Cov tshuaj lom neeg, kua dej, thiab cov tshuaj ntxuav zoo tshaj plaws

Thaum xaiv cov foob rau kev tiv taus tshuaj lom neeg dav dav, PTFE tsis muaj qhov sib piv. Nws yog qhov kev xaiv ua ntej rau kev tswj cov kua qaub muaj zog (xws li cov kua qaub sulfuric lossis nitric acid uas muaj zog), cov hauv paus uas muaj zog, thiab cov kuab tshuaj polar heev xws li ketones thiab esters. PTFE tseem khaws nws cov qauv kom ruaj khov txawm tias thaum lub sijhawm ntxuav-hauv-qhov chaw (CIP) thiab sterilize-hauv-qhov chaw (SIP) cov txheej txheem uas muaj cov caustics hnyav thiab pa.

Cov foob Viton ua tau zoo heev nyob rau hauv ib puag ncig uas muaj cov roj av, cov roj silicone, thiab cov kua kis, ua rau lawv nyob rau hauv tsheb, aerospace, thiab cov ntawv thov hydraulic hnyav. Txawm li cas los xij, Viton tsis sib haum nrog cov esters qis-molecular-weight, ethers, thiab ketones. Kev raug rau cov kuab tshuaj xws li acetone lossis methyl ethyl ketone (MEK) yuav ua rau tus qauv Viton ntsib kev o ntawm volumetric ntau dua 100%, ua rau extrusion tam sim ntawd thiab kev ua tsis tiav loj heev.

Kev txwv ntawm kev sib txhuam, kev sib txhuam thiab kev txwv ntawm kev nias

Cov txheej txheem nias - qhov kev hloov pauv tas mus li ntawm cov khoom siv tom qab tshem tawm cov khoom siv nias - yog qhov ntsuas tseem ceeb rau cov foob pob hluav taws xob thiab dynamic. Viton ua rau pom cov txheej txheem nias qis heev, feem ntau khaws cia tsawg dua 15% kev hloov pauv tom qab 70 teev ntawm 200 ° C. Lub cim xeeb elastic no ua kom muaj kev thaiv tsis tu ncua, tsis muaj qhov xau tsis muaj zog sab nraud.

Ntawm qhov tod tes, PTFE yooj yim rau cov dej txias, lossis nkag mus, nyob rau hauv qhov kev thauj khoom tas mus li. Txhawm rau tiv thaiv qhov no, PTFE cov ntsaws ruaj ruaj feem ntau yog ua ke nrog cov hlau ua kom muaj zog (xws li helical lossis V-springs) kom tswj tau qhov siab ntawm kev sib khi tiv thaiv cov khoom siv. Thaum txhawb nqa nrog cov khoom siv xws li iav fiber, tooj dag, lossis carbon, cov ntsaws ruaj ruaj PTFE muaj zog tuaj yeem tiv taus qhov siab ntawm lub kaw lus, feem ntau tshaj 3,000 psi hauv cov hydraulic thiab pneumatic ua haujlwm siab.

Cov lus sib piv tseem ceeb

Kev sib piv ncaj qha ntawm cov ntaub ntawv no qhia txog lawv cov txheej txheem ua haujlwm sib txawv. Cov lus hauv qab no qhia txog cov yam ntxwv ua tau zoo ntawm cov PTFE ntshiab thiab cov FKM (Viton) txheem los pab tshuaj xyuas cov khoom siv thawj zaug.

Cov Yam Xaiv thiab Kev Ua Raws Cai

Dhau li ntawm cov khoom siv tseem ceeb, cov txheej txheem xaiv yuav tsum suav nrog cov kev hloov pauv ua haujlwm hloov pauv, cov qauv kev ua raws li kev lag luam nruj, thiab qhov tseeb ntawm kev lag luam ntawm kev tsim khoom thiab kev saib xyuas.

Ib txoj hauv kev los ntsuas qhov kev ntsuas kaw tsis yog tsuas yog ntsuas seb cov khoom siv puas muaj peev xwm nyob tau hauv ib puag ncig xwb, tab sis seb nws puas ua tau raws li cov kev cai tswjfwm nruj ntawm lub hom phiaj kev lag luam thaum tseem muaj txiaj ntsig zoo rau lub neej ntawm cov khoom siv.

Cov kev hloov pauv ua haujlwm los ntsuam xyuas

Cov ntawv thov dynamic sealing yuav tsum tau ua tib zoo tshuaj xyuas qhov siab-ceev (PV) txwv, uas txhais qhov siab tshaj plaws ntawm kev sib xyaw ua ke ntawm siab thiab qhov ceev ntawm qhov chaw uas cov khoom siv tuaj yeem tiv taus ua ntej tsim cov cua sov ntau dhau. Virgin PTFE feem ntau muaj qhov txwv PV me me ntawm kwv yees li 1,000 psi-fpm. Rau cov ntawv thov rotary ceev dua, cov PTFE sib xyaw ua ke uas muaj graphite lossis molybdenum disulfide yuav tsum tau ua kom cov cua sov ploj mus thiab txo qhov hnav.

Cov foob Viton, vim lawv cov coefficient ntawm kev sib txhuam ntau dua, feem ntau yuav raug cua sov hauv cov ntawv thov rotary ceev. Lawv zoo tshaj plaws rau cov ntawv thov static, oscillation qis-ceev, lossis linear reciprocating qhov twg lubrication muaj. Kev soj ntsuam cov khoom siv tiav kuj tseem ceeb heev; PTFE xav tau qhov chaw mating polished heev (feem ntau 8 txog 12 micro-inches Ra) kom tiv thaiv kev hnav abrasive sai, thaum elastomers tuaj yeem ua raws li qhov tiav me ntsis rougher.

FDA, USP Chav Kawm VI, thiab kev ua raws li kev lag luam

Hauv cov chaw ua tshuaj, biotechnology, thiab cov khoom noj khoom haus, kev ua raws li cov khoom siv tsis tuaj yeem sib tham tau. Ob qho tib si muaj cov qib ua raws li FDA 21 CFR 177.1550 (rau perfluorocarbons) thiab 177.2600 (rau cov khoom siv roj hmab). Txawm li cas los xij, qhov xav tau tshwj xeeb ntawm cov chaw ib puag ncig uas muaj kev huv siab feem ntau yog qhov txiav txim siab qhov kev xaiv khoom kawg.

PTFE yog qhov nyiam heev rau USP Class VI daim ntawv thov vim nws cov tshuaj lom neeg tsis muaj zog thiab tsis muaj cov khoom rho tawm. Hauv kev ua bioprocessing, qhov twg cov kev txwv rho tawm yuav tsum nyob hauv qab 0.1 mg / in² kom tiv thaiv kev kis kab mob ntawm cov tshuaj lom neeg rhiab heev, PTFE ntshiab muab cov qauv xoom-phooj ywg. Viton, thaum muaj nyob rau hauv cov qib siab-purity, inherently muaj cov neeg sawv cev curing thiab plasticizers uas xav tau kev kho tom qab thiab kev lees paub kom ua tau raws li cov qauv siab-purity zoo sib xws.

Tus nqi, kev tsim khoom, thiab lub neej ua haujlwm

Cov txheej txheem tsim khoom rau cov ntaub ntawv no muaj feem cuam tshuam rau cov tswv yim yuav khoom. Cov foob Viton feem ntau yog txhaj tshuaj lossis nias pwm. Cov txheej txheem no xav tau kev nqis peev pib siab hauv cov cuab yeej hlau tab sis ua rau tus nqi qis heev ntawm qhov ntsuas, ua rau nws zoo tagnrho rau cov qauv O-rings nrog qhov tsawg kawg nkaus xaj ntau (MOQs) tshaj 1,000 units.

Cov foob PTFE feem ntau yog CNC machined los ntawm billet raj lossis rods. Qhov no tshem tawm cov nqi cuab yeej thiab tso cai rau kev ua qauv sai thiab kev cai geometries, tab sis ua rau tus nqi siab dua rau ib chav tsev. Hais txog lub neej kev pabcuam, qhov kev nqis peev pib siab dua hauv lub foob PTFE muaj zog feem ntau yog qhov raug cai hauv kev siv tshuaj lom neeg hnyav, qhov twg nws tuaj yeem kav ntev dua li elastomeric sib npaug los ntawm qhov piv ntawm 5-rau-1, txo qis heevkev cuam tshuam kev saib xyuasthiab cov nqi ua haujlwm cuam tshuam.

Yuav Xaiv Li Cas Ntawm PTFE Thiab Viton Seals

Kev txiav txim siab qhov kev daws teeb meem zoo tshaj plaws yuav tsum tau txhais cov ntaub ntawv theoretical mus rau hauv kev txiav txim siab engineering uas muaj qauv. Los ntawm kev soj ntsuam cov kev siv tsis tu ncua piv rau cov peev xwm ntawm cov khoom siv, cov engineers tuaj yeem teev cov foob uas ua kom muaj kev ntseeg siab tshaj plaws thiab kev siv nyiaj tsawg.

Cov txheej txheem hauv qab no muab cov qauv meej rau kev xaiv ntawm PTFE thiab Viton raws li cov ntaub ntawv empirical, kev txwv kev ua haujlwm, thiab kev lag luam hauv lub neej.

Cov kauj ruam ua haujlwm xaiv cov kauj ruam

Ib txoj haujlwm xaiv ua haujlwm zoo pib nrog kev tshuaj xyuas tshuaj lom neeg kom meej. Sau txhua yam kua uas lub foob yuav ntsib, suav nrog cov khoom siv tseem ceeb, cov roj nplua nyeem theem ob, thiab cov tshuaj ntxuav tsis tu ncua. Tom ntej no, txhais lub hnab thermal, sau tseg ob qho tib si qhov kub thiab txias ua haujlwm tas mus li thiab lub sijhawm luv luv thermal spikes. Yog tias qhov kub ntawm lub kaw lus poob qis dua -20 ° C lossis tshaj + 200 ° C, PTFE yuav tsum xaiv.

Kauj ruam thib peb yog kev soj ntsuam cov kev xav tau ntawm cov khoom siv thiab cov khoom siv hloov pauv. Txheeb xyuas seb lub foob puas yog static lossis dynamic, thiab soj ntsuam qhov chaw tiav ntawm cov khoom siv thiab qhov chaw teeb tsa muaj. Thaum kawg, ua qhov kev tshuaj xyuas tus nqi siv tas mus li. Piv cov nqi txhua xyoo ntawm kev hloov lub foob Viton tus qauv - suav nrog kev ua haujlwm thiab lub sijhawm tsis ua haujlwm uas tau npaj tseg - piv rau tus nqi pib siab dua tab sis lub neej ntev dua ntawm lub foob PTFE caij nplooj ntoos hlav uas tau ua raws li kev cai.

Thaum twg yuav tsum xaiv PTFE piv rau Viton

Ua ib qho kev qhia dav dav txog kev tsim kho, qhia meej txog Viton cov ntsaws ruaj ruaj rau cov ntawv thov uas muaj cov kua hydraulic txheem, cov roj cav, thiab kev sib khi tshuaj lom neeg dav dav uas cov khoom siv kho vajtse xav tau kev ywj pheej siab thiab yooj yim rau kev teeb tsa. Viton tseem yog tus qauv kev lag luam rau kev sib khi uas pheej yig thiab txhim khu kev qha hauv kev lag luam tsheb thiab cov tshuab hnyav.

Ntawm qhov tod tes, qhia meej PTFE cov ntsaws ruaj ruaj rau cov chaw uas muaj qhov kub thiab txias heev, cov tshuaj sib xyaw ua ke heev, lossis cov xwm txheej qhuav uas qhov kev sib txhuam tsawg yog qhov tseem ceeb. PTFE yog qhov kev xaiv zoo tshaj plaws rau kev ua cov tshuaj lom neeg, semiconductor, thiab biopharmaceutical industries qhov twg cov khoom tsis ua haujlwm tsis yog qhov kev xaiv.

Cov Ntsiab Lus Tseem Ceeb

• Cov lus xaus tseem ceeb tshaj plaws thiab cov laj thawj rau Viton Seals
• Cov lus qhia tshwj xeeb, kev ua raws li txoj cai, thiab kev kuaj xyuas kev pheej hmoo uas tsim nyog lees paub ua ntej koj cog lus
• Cov kauj ruam tom ntej thiab cov lus ceeb toom uas cov nyeem ntawv tuaj yeem siv tau tam sim ntawd

Cov Lus Nug Feem Ntau

Thaum twg kuv yuav tsum xaiv Viton seals dua li PTFE seals?

Xaiv Viton rau cov roj, roj av, hydrocarbons, thiab cov ntawv thov uas xav tau kev sib khi zoo, kev teeb tsa yooj yim, thiab kev rov qab zoo ntawm kev nias txog li 200 ° C.

Cov tshuaj twg muaj kev pheej hmoo rau Viton seals?

Viton muaj peev xwm tawm tsam nrog ketones, esters uas tsis muaj molecular hnyav, qee cov amines, thiab qee cov polar solvents uas muaj zog heev. Ib txwm xyuas kom meej qhov concentration thiab qhov kub ntawm cov xov xwm ua ntej xaiv.

Puas yog PTFE yeej ib txwm zoo dua li Viton rau kev tiv thaiv tshuaj lom neeg?

Tsis yog txhua lub sijhawm. PTFE tiv taus ntau cov tshuaj lom neeg thiab kub dua, tab sis Viton feem ntau kaw zoo dua ntawm cov khoom siv tsis zoo thiab feem ntau pheej yig dua rau kev pabcuam twj tso kua mis.

Puas yog Victor Seals muab cov khoom siv hloov Viton rau cov twj tso kua mis kev lag luam?

Yog. Victor Seals muab cov khoom siv sib xws rau OEM thiab hloov pauv rau ntau lub twj tso kua mis, suav nrog Grundfos, Flygt, Lowara, IMO, thiab Allweiler.

Kuv yuav xaiv lub foob Viton kom raug rau kuv lub twj tso kua mis li cas?

Xyuas cov kua dej, qhov kub thiab txias, qhov siab, qhov ceev ntawm lub qhov, thiab cov tshuaj ntxuav. Qhia cov ntaub ntawv ua haujlwm no rau Victor Seals kom phim hom foob thiab qib elastomer.