Qhov zoo tshaj plaws siv rau nitrile roj hmab gaskets? 

Yog li ntawd, koj tab tom xav txog qhov Honestly, feem ntau cov neeg tsuas yog xav txog roj resistant thiab nres ntawd. Qhov ntawd yog qhov pib qhov tseeb, tab sis nws nco qhov nuance. Hauv kev xyaum, NBR tus nqi tiag tiag yog nyob rau hauv nws qhov sib npaug - zoo compression teeb, dlej abrasion tsis kam, thiab qhov kev ntseeg tau zoo rau cov roj, roj, thiab ntau yam tshuaj, tag nrho ntawm tus nqi uas tsis ua rau lub txhab nyiaj. Nws yog lub workhorse, tsis yog lub show pony. Qhov kev ua kom yuam kev yog paub qhov twg qhov nyiaj tshuav ua haujlwm thiab qhov twg nws pib poob.

Qhov twg NBR Tiag Tiag: Qhov Qab Zib Spot

Rau kuv, classic, tsis muaj-brainer daim ntawv thov yog nyob rau hauv automotive roj systems. Peb tab tom tham txog roj twj tso kua mis modules, xa cov ntsaws ruaj ruaj, carburetor gaskets (ntawm cov cav qub, tau kawg), thiab ntau yam O-rings hauv kab. Qhov tseem ceeb ntawm no yog qhov raug tsis tu ncua roj av thiab diesel, feem ntau nrog niaj hnub roj additives. Tus qauv NBR compound, hais nrog cov ntsiab lus nruab nrab acrylonitrile (ACN), ua haujlwm zoo nkauj. Kuv tau pom lawv nyob rau ntau xyoo hauv cov cheeb tsam no uas qhov kub tsis tshua muaj siab tshaj 100 ° C. Nws yog kwv yees.

Tom qab ntawd muaj kev lag luam dav dav hydraulics. Tsis yog qhov ua tau zoo, hluav taws kub-resistant phosphate ester systems-uas yog cov tsiaj nyaum sib txawv-tab sis koj tus qauv ntxhia roj-raws li hydraulic systems hauv tshuab. Lub gaskets ntawm lub valve npog, cov dej reservoirs, thiab cov kav dej tsis tshua muaj siab. Lawv nyob rau hauv tas li compression thiab da dej hauv roj. NBR gasket tsim tau zoo ntawm no muab kev ruaj ntseg, lub sij hawm ntev. Hom tsis ua hauj lwm feem ntau yog maj mam hardening ntau xyoo, tsis yog qhov kev puas tsuaj sai sai, uas yog qhov koj xav tau rau kev teem sijhawm tu.

Lwm qhov chaw uas feem ntau saib tsis pom yog cov cuab yeej ntxuav hauv kev ua zaub mov. Tam sim no, hnov ​​​​kuv tawm—NBR feem ntau tsis yog zaub mov-qib tshwj tsis yog tshwj xeeb suav nrog thiab tau lees paub. Tab sis rau cov ntsaws ruaj ruaj sab nraud ntawm lub twj tso kua mis, cov khoom siv hauv cov khoom siv uas tau txau nrog dej kub, tshuaj ntxuav tes, thiab cov tshuaj tua kab mob me, nws yog tus yeej tau txais txiaj ntsig zoo. Nws tiv taus qhov o thiab degradation uas yuav tua tus qauv EPDM gasket hauv cov kua zaub tshuaj. Koj tsuas yog yuav tsum paub tseeb tias nws tsis yog nyob rau hauv kev sib cuag ncaj qha nrog cov khoom ntws.

Cov Limits thiab Yuav luag Scenarios

Qhov no yog qhov kev paub ua rau koj them nyiaj, feem ntau yog los ntawm kev zam qhov yuam kev. Qhov siab tshaj plaws yog qhov kub thiab txias. NBR qhov kev txwv sab saud feem ntau tau txais nyob ib puag ncig 100-120 ° C txuas ntxiv. Thawb nws mus rau 135 ° C, thiab lub neej expectancy poob. Kuv kawm qhov no txoj kev nyuaj ntawm cov kab tawm compressor. Cov specs hais tias roj resistant, yog li peb siv NBR. Nws ua haujlwm… li ntawm rau lub hlis ua ntej nws ci rau hauv qhov nkig, tawg tawg. Qhov ntsuas kub tsis sib xws tau nce mus dhau nws qhov txwv. Txoj haujlwm ntawd xav tau FKM (Viton) gasket. NBR yog rau nruab nrab cua sov.

Ozone thiab huab cua yog lwm qhov chaw tsis muaj zog. Yog tias lub gasket yuav raug tshav ntuj thiab huab cua sab nraum zoov, tshwj xeeb tshaj yog nyob ze cov khoom siv hluav taws xob uas tuaj yeem tsim ozone, NBR yuav tawg. Nws tsis yog khoom siv sab nraum zoov. Kuv tau pom nws tshwm sim ntawm sab nraud hydraulic fittings ntawm cov khoom siv txawb uas zaum ntev. Lub foob ntsia zoo kom txog thaum koj kov nws thiab nws tawg. Rau cov xwm txheej ntawd, koj rov qab mus rau EPDM lossis ib qho chaw ruaj khov tshwj xeeb.

Tom qab ntawd muaj tshuaj sib haum xeeb tshaj li cov hydrocarbons. Ketones, esters, muaj zog acids, dej nres (DOT 3, 4, 5.1) - cov no yuav tawm tsam tus qauv NBR. Muaj ib qho kev xav tsis zoo uas cov roj resistant txhais tau tias cov tshuaj resistant. Tsis yog. Ib txwm, nco ntsoov xyuas daim ntawv qhia kev sib raug zoo rau cov kua dej tshwj xeeb. Ib tus neeg muag khoom nrog cov khoom muag sib sib zog nqus thiab kev paub txuj ci tseem ceeb ntawm no. Piv txwv li, ib lub tuam txhab nyiam HANDAN ZITAI FREWER RAUG UA MOV., Ltd., uas ua haujlwm los ntawm Tuam Tshoj tus qauv loj tshaj plaws hauv paus hauv Yongnian, feem ntau nqa ntau qib ntawm cov khoom siv. Thaum paub txog cov fasteners, ntau lub tuam txhab koom ua ke kuj muab lossis tuaj yeem qhia txog cov khoom sib khi kom zoo rau kev sib dhos, nkag siab tias lub ntsia liaj qhov rooj thiab lub gasket yuav tsum ua haujlwm raws li qhov system. Lawv qhov chaw nyob ze ntawm txoj kev thauj loj xws li Beijing-Guangzhou Railway txhais tau hais tias lawv feem ntau nrhiav lossis muab cov khoom siv rau ntau qhov kev siv hauv kev lag luam, yog li lawv pom tias ua haujlwm dab tsi thiab tsis ua haujlwm hauv thaj chaw.

Khoom Qib thiab Dab Ntxwg Nyoog hauv Cov Lus Qhia

Tsis yog tag nrho NBR yog tsim sib npaug. Cov ntsiab lus acrylonitrile yog lub ntsiab lus. High ACN muab cov roj zoo dua / roj ua haujlwm tab sis ntawm tus nqi qis-kub yooj yim. Rau lub gasket nyob rau hauv Northern European hydraulic system uas pom -20 ° C, ib tug high-ACN NBR tej zaum yuav nruj heev rau kaw kom zoo thaum pib. Koj yuav xav tau ACN qis. Nws yog kev sib pauv.

Tom qab ntawd muaj qhov sib xyaw ua ke - cov muab tub lim, cov yas yas, thiab kho qhov system. Lub gasket rau lub foob dynamic (xws li lub foob foob) xav tau kev sib txawv ntawm kev puas tsuaj thiab compression teeb lub zog tshaj li qhov zoo li qub flange gasket. Ib tus neeg muag khoom zoo yuav nug txog daim ntawv thov: zoo li qub lossis dynamic? Qhov kub tsis tu ncua? Cov kua dej tawm? Siab? Cov lus teb dictate lub compound. Ib qho pheej yig, generic NBR gasket tuaj yeem kaw thaum pib tab sis ua tsis tiav vim nws tsis tau tsim los rau qhov kev ntxhov siab tshwj xeeb.

Kuv nco qab txog qhov project uas muaj kev sib khi rau biodiesel blending system. Standard NBR ua tsis tau sai. Qhov teeb meem tsis yog lub hauv paus roj, tab sis qhov siab dua ntawm cov esters thiab muaj peev xwm ua rau muaj kev txhoj puab heev ntxiv hauv kev sib xyaw. Peb hloov mus rau hydrogenated nitrile (HNBR) gasket, uas muaj tshuaj lom neeg zoo dua thiab thermal kuj, thiab qhov teeb meem ploj mus. Zaj lus qhia yog los saib dhau lub npe ntawm cov kua dej rau nws qhov tseeb, niaj hnub muaj pes tsawg leeg.

Kev siv tswv yim thiab kev teeb tsa kev txawj ntse

Txawm tias qhov zoo tshaj plaws gasket tsis yog tias ntsia tsis raug. NBR muaj compressibility zoo, tab sis nws tsis yog infinitely zam txim. Lub flange nto tiav tseem ceeb. ntxhib heev, thiab nws yuav txiav rau hauv cov khoom nyob rau hauv bolt load. Ntws heev (zoo li daim iav tiav), thiab nws yuav tsis muaj qhov txaus los tiv thaiv creep. Ib qho serrated tiav lossis 60-90 microinch Ra feem ntau yog qhov chaw qab zib.

Bolt torque thiab ib ntus yog qhov tseem ceeb. Koj xav tau txawm compression ntws cov khoom gasket me ntsis rau hauv flange imperfections. Rhuav nws ntau dhau, thiab koj yuav extrude cov roj hmab los yog ua rau muaj kev ntxhov siab heev uas nws ua rau kev laus. Under-torque, thiab nws yuav xau. Nco ntsoov ua raws li OEM torque specs yog tias muaj. Yog tsis yog, txoj cai dav dav rau tus qauv nitrile roj hmab gasket ntawm ib lub flange steel yog kom torque mus rau nruab nrab-ntau qhov ntsia hlau loj thiab qib, tom qab ntawd rov kuaj xyuas tom qab lub voj voog kub.

Cia yog lwm yam yooj yim uas tib neeg mess up. Tsis txhob tso NBR gaskets rau hauv lub thawv kub hauv lub hnub ncaj qha, lossis muab tso rau hauv cov hlau hnyav. Lawv yuav siv sij hawm, tau ozone tawg, los yog puas. Khaws lawv nyob rau hauv lawv cov khoom ntim, nyob rau hauv ib qho chaw txias, tsaus, qhuav. Cov khoom tseem ceeb, tab sis koj yuav xav tsis thoob.

Thaum Mus Saib Lwm Qhov Chaw: Lwm Txoj Kev

Yog li thaum twg koj tso NBR? Kuv twb hinted rau nws: kub tsis tu ncua (siab tshaj 120 ° C), raug ozone / huab cua, thiab aggressive chemicals sab nraum tsev neeg hydrocarbon. Koj mus-rau lwm txoj kev ces dhau los ua:

Qhov kev txiav txim siab ib txwm los ntawm cov kua dej tshwj xeeb, qhov kub thiab txias, siab, thiab tus nqi. Tsis muaj universal zoo tshaj gasket. Rau ib feem loj ntawm cov kev lag luam thiab kev siv tsheb thauj mus los uas muaj cov kua roj av ntawm qhov kub nruab nrab, nitrile roj hmab gaskets nyob twj ywm lub neej ntawd, kev xaiv pragmatic. Lawv qhov kev siv zoo tshaj plaws yog nyob rau hauv cov chaw suav tsis txheeb, qhov tsis zoo uas qhov kev ntseeg tau thiab cov txiaj ntsig zoo tshaj qhov kev ua tau zoo. Koj tsuas yog yuav tsum paub cov ciam teb, thiab hwm lawv.