Ukusetshenziswa kweshidi lerabha le-asbestos embonini yokuvala ama-valve kunezinzuzo ezilandelayo:

Intengo ephansi: Uma kuqhathaniswa nezinye izinto zokuvala ezisebenza kahle kakhulu, intengo yeshidi lerabha le-asbestos ishibhile.

Ukumelana namakhemikhali: Ishidi lerabha le-asbestos linokumelana okuhle kokugqwala kwezinye izinto ezisetshenziswayo ezinezakhiwo zamakhemikhali ezithambile, ezingahlangabezana nezidingo zezimo zokusebenza ezijwayelekile.

Ukulungiswa okulula: Ngenxa yokuthi ishidi lerabha le-asbestos kulula ukulicubungula nokulishintsha, kulula kakhulu ukugcinwa kwevalvu.

Inkinga enkulu yeshidi lerabha le-asbestos ukuthi yize izinto ze-gasket zengezwe ngerabha kanye nezinye izigcwalisi, azikwazi ukugcwalisa ngokuphelele izikhala ezincane ezixhumene, futhi kukhona ukungena okumbalwa. Ngakho-ke, endaweni engcolile kakhulu, noma ngabe ingcindezi kanye nokushisa akuphakeme, azikwazi ukusetshenziswa. Uma zisetshenziswa kwezinye izinto ezishisa kakhulu zikawoyela, ngokuvamile esikhathini sokusetshenziswa kamuva, ngenxa yokufakwa kwerabha kanye nokugcwalisa, amandla ayancishiswa, izinto ziyakhululeka, futhi kukhona ukungena endaweni engaphakathi nangaphakathi kwe-gasket, futhi kukhona ukubilisa kanye nomusi. Ngaphezu kwalokho, ishidi lerabha le-asbestos liboshelwa kalula endaweni yokuvala i-flange ekushiseni okuphezulu, okuletha inkinga enkulu ekufakweni kwe-gasket.

Esimweni sokushisa, ingcindezi ye-gasket ezindaweni ezahlukahlukene incike esilinganisweni sokugcina amandla ezinto ze-gasket. Kukhona amanzi ekristalu namanzi afakwe emanzini ezintweni ze-asbestos fiber. Ku-110℃, u-2/3 wamanzi afakwe emanzini phakathi kwezintambo ancishisiwe, futhi amandla okunamathela ezintambo ancishisiwe cishe ngo-10%. Ku-368℃, wonke amanzi afakwe emanzini ancishisiwe ayaphuma, futhi amandla okunamathela entambo ancishisiwe cishe ngo-20%. Ngaphezu kuka-500 ℃, amanzi ekristalu aqala ukuncishiswa, futhi amandla aphansi.

Ishidi lerabha le-asbestos liqukethe ama-ion e-chloride kanye ne-sulfide, kulula ukwakha amaseli e-galvanic okugqwala ane-flanges yensimbi ngemva kokumuncwa kwamanzi, ikakhulukazi okuqukethwe kwe-sulfur kweshidi lerabha le-asbestos elingamelana namafutha kuphakeme kaningana kunokweshidi lerabha le-asbestos elivamile, ngakho-ke alifanele ukusetshenziswa ezindaweni ezingezona ezoyela. Ama-gasket azovuvukala ezindaweni ezingezona ezoyela, kodwa ngaphakathi kobubanzi obuthile, empeleni akukho mthelela ekusebenzeni kokuvala.

Kodwa-ke, kubalulekile ukuqaphela ukuthi i-asbestos ikhonjwe njengento eyingozi, futhi ukusetshenziswa kwamashidi enjoloba e-asbestos kungaletha izingozi ezingaba khona empilweni nasemvelweni.