Chigaro chevharuvhu yeshavishaviChikamu chinobviswa mukati mevharuvhu, basa guru nderekutsigira ndiro yevharuvhu yakavhurika kana kuvharwa zvizere, uye inoumba sealant yekuvharira. Kazhinji, dhayamita yechigaro ihukuru hwevharuvhu. Zvigaro zvevharuvhu zvebhatafurayi zvakafara kwazvo, zvinhu zvinowanzoshandiswa zvinoti soft sealing EPDM, NBR, PTFE, uye metal hard sealing carbide material. Tevere tichaisa chimwe nechimwe.
1. EPDM-Ichienzaniswa nedzimwe rabha dzinoshandiswa zvakanyanya, rabha yeEPDM ine mabhenefiti makuru, anonyanya kuratidzwa mu:
A. Inodhura zvishoma, mumabhanana anoshandiswa zvakanyanya, chisimbiso cherabha cheEPDM chisina kubikwa ndicho chakareruka, unogona kuzadza zvakawanda, uchideredza mutengo werabha.
B. Kusakura kwezvinhu zveEPDM, kushivirira kupiswa nezuva, kushivirira kupisa, kushivirira mhute yemvura, kushivirira mwaranzi, kwakakodzera kune asidhi isina simba uye alkali media, uye hunhu hwakanaka hwekudzivirira kupisa.
C. Kupisa kwakaderera, kushoma kunogona kuva -40 ° C - 60 ° C, kunogona kuva mamiriro ekupisa e130 ° C ekushandiswa kwenguva refu.
2.NBR-inodzivirira mafuta, inodzivirira kupisa, inotsungirira kupfeka uye panguva imwe chete ine simba rakanaka rekudzivirira mvura, kuvharwa kwemhepo uye hunhu hwakanaka hwekubatanidza. Kushandiswa kwakawanda mupayipi yemafuta, dambudziko nderekuti haidzivirire tembiricha yakaderera, inodzivirira ozone, hunhu husina kunaka hwekudzivirira, uye kusimba kwayo kwakajairika.
3. PTFE: purasitiki yefluorine, chinhu ichi chine simba guru rekudzivirira acid nealkali, chinodzivirira zvakasiyana-siyana zve organic solvents, nepo chinhu ichi chiri chekudzivirira kupisa kwakanyanya, chinogona kushandiswa nguva dzose pa260 ℃, tembiricha yepamusoro inogona kusvika 290-320 ℃, PTFE yakaonekwa, yakagadzirisa matambudziko akawanda muindasitiri yemakemikari, peturu, mishonga nedzimwe nzvimbo.
4. Chisimbiso chesimbi chakasimba (carbide): chigaro chesimbi chakasimba chevharuvhu chine simba guru rekudzivirira kupisa kwakanyanya uye kumanikidzwa kwakanyanya, ngura, hunhu hwekudzivirira kupfeka, zvakanaka kwazvo kugadzirisa zvikanganiso zvechisimbiso chakapfava hachidziviriri kupisa kwakanyanya uye kumanikidzwa kwakanyanya, asi chisimbiso chakasimba chechinhu chiri pamusoro pezvinodiwa zvekugadzirisa kwemaitiro acho chakakwira kwazvo, kushaya simba chete kwechigaro chesimbi chakasimba chevharuvhu chisina kunaka, chichava munguva refu mushure mekushanda kwebasa rekubuda kwemvura.