Lub rooj zaum ntawm lub valve npauj npaimyog ib feem uas tshem tau sab hauv lub valve, lub luag haujlwm tseem ceeb yog txhawb lub phaj valve qhib tag nrho lossis kaw tag nrho, thiab tsim lub sealing vice. Feem ntau, lub cheeb ntawm lub rooj zaum yog qhov loj ntawm lub valve caliber. Cov khoom siv rooj zaum npauj npaim dav heev, cov ntaub ntawv siv feem ntau yog EPDM, NBR, PTFE, thiab cov khoom siv hlau nyuaj sealing carbide. Tom ntej no peb yuav qhia ib qho los ntawm ib qho.
1.EPDM-Piv nrog rau lwm cov roj hmab dav dav, EPDM roj hmab muaj cov txiaj ntsig zoo, feem ntau pom hauv:
A. Tus nqi tsim nyog heev, hauv cov txiv tsawb uas feem ntau siv, EPDM cov roj hmab raw seal yog qhov sib dua, koj tuaj yeem ua ntau yam kev sau, txo cov nqi roj hmab.
B. Cov khoom siv EPDM tiv taus kev laus, tiv taus lub hnub ci, tiv taus cua sov, tiv taus dej ua pa, tiv taus hluav taws xob, tsim rau cov kua qaub tsis muaj zog thiab alkali media, cov khoom rwb thaiv tsev zoo.
C. Qhov kub thiab txias, qhov qis tshaj plaws tuaj yeem yog -40 ° C - 60 ° C, tuaj yeem yog 130 ° C kub rau kev siv mus sij hawm ntev.
2. NBR-tsis kam rau roj, tsis kam rau cua sov, tsis kam hnav thiab tib lub sijhawm muaj kev tiv thaiv dej zoo, huab cua sib khi thiab cov khoom sib txuas zoo heev. Ntau daim ntawv thov hauv cov kav dej roj, qhov tsis zoo yog tias nws tsis tiv taus qhov kub qis, tsis kam rau ozone, cov khoom rwb thaiv tsev tsis zoo, thiab elasticity kuj dav dav.
3. PTFE: ib hom yas fluorine, cov khoom no muaj zog tiv taus cov kua qaub thiab alkali, kang ntau yam organic solvents kev ua tau zoo, thaum cov khoom kub siab tiv taus, siv tau tas li ntawm 260 ℃, qhov kub siab tshaj plaws tuaj yeem ncav cuag 290-320 ℃, PTFE tshwm sim, daws tau zoo hauv kev lag luam tshuaj lom neeg, roj av, tshuaj thiab lwm yam lag luam hauv thaj chaw ntawm ntau yam teeb meem.
4. Lub foob hlau tawv (carbide): cov khoom siv foob hlau tawv muaj kev tiv taus kub thiab siab, tiv taus corrosion, hnav tsis kam, zoo heev los ua kom muaj qhov tsis zoo ntawm cov khoom siv foob mos tsis tiv taus kub thiab siab, tab sis cov khoom siv foob tawv ntawm cov txheej txheem xav tau siab heev, qhov tsis zoo ntawm cov hlau tawv foob lub rooj zaum foob tsis zoo, yuav nyob ntev tom qab ua haujlwm ntawm kev xau.