Npauj npaim valve roojyog ib feem tshem tau hauv lub valve, lub luag hauj lwm tseem ceeb yog los txhawb lub valve phaj siab qhib los yog kaw tag nrho, thiab ua lub sealing vice. Feem ntau, txoj kab uas hla ntawm lub rooj zaum yog qhov loj ntawm lub valve caliber. Npauj npaim valve lub rooj khoom siv dav heev, cov khoom siv feem ntau yog mos sealing EPDM, NBR, PTFE, thiab hlau hard sealing carbide khoom. Tom ntej no peb yuav qhia ib tug los ntawm ib tug.
1.EPDM-Piv nrog rau lwm hom roj hmab, EPDM roj hmab muaj cov txiaj ntsig zoo, feem ntau pom hauv:
A. Tus nqi zoo heev, nyob rau hauv cov txiv tsawb uas nquag siv, EPDM cov roj hmab raw cov ntaub ntawv yog lub teeb tshaj plaws, koj tuaj yeem ua ntau qhov txhaws, txo cov nqi roj hmab.
B. EPDM cov ntaub ntawv aging kuj, tiv taus tshav ntuj, tshav kub tsis kam, dej vapor kuj, hluav taws xob tsis kam, haum rau qaug zog acid thiab alkali xov xwm, zoo rwb thaiv tsev zog.
C. Qhov kub thiab txias, qhov qis tshaj tuaj yeem yog -40 ° C - 60 ° C, tuaj yeem yog 130 ° C qhov kub thiab txias rau kev siv mus ntev.
2.NBR-roj resistant, tshav kub resistant, hnav resistant thiab nyob rau tib lub sij hawm muaj zoo dej kuj, huab cua sealing thiab zoo heev bonding zog. Ntau daim ntawv thov nyob rau hauv cov roj pipeline, qhov tsis zoo yog tias nws tsis tiv taus qhov kub thiab txias, ozone tsis kam, tsis zoo rwb thaiv tsev, elasticity kuj yog dav dav.
3. PTFE: fluorine yas, cov khoom no muaj zog tiv taus acid thiab alkali, kang ntau cov organic solvents kev ua tau zoo, thaum cov khoom yog kub tsis kam, tuaj yeem siv tsis tu ncua ntawm 260 ℃, qhov kub siab tshaj tuaj yeem ncav cuag 290-320 ℃, PTFE tau tshwm sim, ua tiav kev lag luam tshuaj lom neeg, roj av, tshuaj thiab lwm yam hauv kev lag luam.
4. Hlau tawv sealing (carbide): hlau hard seal valve lub rooj khoom siv tau zoo heev tiv taus kub thiab siab siab, corrosion kuj, hnav tsis kam, zoo heev ua rau cov tsis xws luag ntawm cov mos sealing khoom tsis resistant rau kub thiab siab siab, tab sis lub hard sealing cov ntaub ntawv nyob rau hauv cov txheej txheem ntawm cov txheej txheem yog siab heev, tsuas yog qhov tsis zoo ntawm cov hlau hard seal valve lub rooj sealing kev ua tau zoo yog lub sijhawm ntev ntawm kev ua haujlwm tsis zoo.