Cov thawv ntim khoom yog cov khoom lag luam uas tsim los rau cov thawv ntim khoom. Cov khoom siv yog ib txoj hlua elastic uas muaj ib qho square lossis round cross section. Cov khoom yog tsim los ntawm asbestos xov los yog lwm yam raw khoom. Ua tsaug rau cov khoom uas tau nthuav tawm, nws muaj peev xwm los xyuas kom meej qhov nruj ntawm kev txav thiab nyob ruaj khov ntawm cov txheej txheem. Cov hlua zoo zam qhov cuam tshuam ntawm ib puag ncig hnyav thiab tiv taus qhov kub hloov pauv. Raws li cov khoom tsim, cov khoom tuaj yeem muab faib ua asbestos thiab non-asbestos.
Cov thawv ntim khoom ntim yuav tsum kaw cov nodes kom zoo hauv txhua qhov chaw ua haujlwm. Lawv tuaj yeem muab faib ua ntau hom thiab chav kawm. Txhua tus ntawm lawv muaj qee theem thiab lub sijhawm ua haujlwm. Piv txwv li, cov khoom siv asbestos tuaj yeem siv rau hauv cov khoom siv uas ua cov roj thiab tseem cuam tshuam nrog cov tshuaj. Cov txheej txheem txheej txheem txheej txheem yog nqa tawm siv cov xovxwm tshwj xeeb.
Qee yam ntawm cov khoom uas tau nthuav tawm tuaj yeem muaj cov graphite fibers, uas yog impregnated nrog polytetrafluoroethylene, thiab tseem ntxiv nrog cov paj rwb xov. Cov kab mob qog no yog siv rauseals rau plunger thiab centrifugal twj. Lawv yog cov zoo ntawm kev tiv thaiv dej to. Thiab cov khoom lag luam uas tau nthuav tawm tuaj yeem tswj cov khoom tsim hluav taws xob hauv cov twj tso kua mis, thiab txo lawv lub zog siv. Qhov tseeb yog tias lawv muaj cov coefficient tsawg ntawm kev sib txhuam. Qhov zoo ntawm cov khoom graphite yog tias lawv tiv taus kub heev (kwv yees li 550 degrees
), tshuaj tua kab mob. Txawm li cas los xij, cov khoom yuav tsum tsis txhob raug cov dej noo, vim nws tuaj yeem ua rau corrosion ntawm cov hlau hauv cov txheej txheem.
Graphite packings tuaj yeem ua rau nws tus kheej. Cov khoom no yuav tsum tau siv los kaw cov chaw uas txhua qhov kev txav mus los yuav poob. Feem ntau cov txheej txheem yuav tsum tau ua nyob rau hauv cov kev siv pej xeem thaum lub sij hawm tawg ntawm cov kav dej los yog cua sov. Ua tsaug rau cov hlua, nws muaj peev xwm tsis tsuas yog tso tseg qhov xau, tab sis kuj tiv thaiv nws qhov tshwm sim ntxiv.
Yog tias koj yuav siv cov hnab ntim cov qog rau cov twj centrifugal, nws yog qhov zoo tshaj los xaiv cov hlua khi. Ua ntej, cov khoom yuav tsum tau tsau rau hauv lub tog raj kheej roj, uas yuav muaj me me ntawm paraffin. Qhov zoo ntawm cov khoom siv no yog tias nws tuaj yeem tiv taus siab txog 20 MPa thiab ua haujlwm tau zoo nyob rau hauv qhov kub thiab txias (ntawm -40 txog +100 degrees). Txawm li cas los xij, cov khoom raug puas tsuaj sai sai los ntawm alkalis thiab acids.
Qhov kev xaiv nthuav yog cov qog ua kua nplaum,uas yog tsim los ntawm fluoroplast. Lawv tuaj yeem ua rau hauv daim ntawv ntawm cov nplhaib, chips lossis cuffs. Cov khoom no muaj qhov elasticity me ntsis, yog li cov roj hmab gaskets yuav tsum tau siv ntxiv rau nws. Ntxiv nrog rau cov khoom ntim tau nthuav tawm, kuj tseem muaj cov khoom siv tooj liab.
