Isihlalo se-valve yebhabhathanekuyingxenye esuswayo ngaphakathi kwevalvu, indima eyinhloko ukusekela ipuleti levalvu livuleke noma livalwe ngokuphelele, futhi lakhe i-sealing vice. Ngokuvamile, ububanzi besihlalo buyisayizi we-valve caliber. Izinto zesihlalo sevalvu yebhabhathane zibanzi kakhulu, izinto ezisetshenziswa kakhulu yi-soft sealing EPDM, NBR, PTFE, kanye nezinto ze-carbide zensimbi eqinile. Okulandelayo sizokwethula ngayinye ngayinye.
1. I-EPDM-Uma iqhathaniswa nenye irabha yenhloso ejwayelekile, irabha ye-EPDM inezinzuzo ezinkulu, ikakhulukazi ezibonakala ku:
A. Kubiza kakhulu, kubhanana ovame ukusetshenziswa, uphawu lwerabha olungavuthiwe lwe-EPDM lulula kakhulu, ungenza ukugcwalisa okuningi, unciphise izindleko zerabha.
B. Ukumelana nokuguga kwezinto ze-EPDM, ukumelana nokuchayeka elangeni, ukumelana nokushisa, ukumelana nomhwamuko wamanzi, ukumelana nemisebe, kufanelekile kwi-acid ebuthakathaka kanye ne-alkali media, izakhiwo ezinhle zokuvikela.
C. Ububanzi bokushisa, obuphansi kakhulu bungaba ngu-40 ° C - 60 ° C, bungaba yizimo zokushisa ezingu-130 ° C zokusetshenziswa kwesikhathi eside.
2. I-NBR-oyela ayimelani nokushisa, ayigugi futhi ngesikhathi esifanayo inokumelana okuhle kwamanzi, ukuvalwa komoya kanye nezakhiwo ezinhle kakhulu zokubopha. Ukusetshenziswa okwengeziwe emgudwini kawoyela, ukungathandeki ukuthi ayimelani namazinga okushisa aphansi, ukumelana ne-ozone, izakhiwo ezimbi zokuvimbela ukushisa, kanye nokunwebeka nakho kuyinto evamile.
3. I-PTFE: ipulasitiki ye-fluorine, le nto inokumelana okunamandla ne-asidi ne-alkali, ikwazi ukumelana nezinyibilikisi ezahlukahlukene eziphilayo, kuyilapho into ikwazi ukumelana nokushisa okuphezulu, ingasetshenziswa njalo ku-260 ℃, izinga lokushisa eliphakeme kakhulu lingafinyelela ku-290-320 ℃, i-PTFE yavela, yaxazulula ngempumelelo imboni yamakhemikhali, uphethiloli, imithi kanye neminye imboni emkhakheni wezinkinga eziningi.
4. I-Metal hard seal (i-carbide): I-metal hard seal valve seat material inokumelana okuhle kakhulu nokushisa okuphezulu kanye nokucindezela okuphezulu, ukumelana nokugqwala, izici zokumelana nokuguguleka, kuhle kakhulu ukuvala amaphutha e-soft seal material ayimelani nokushisa okuphezulu kanye nokucindezela okuphezulu, kodwa i-hard seal material ezidingweni zokucubungula zenqubo iphezulu kakhulu, okuwukuphela kwento embi yokusebenza kwe-metal hard seal valve seat seal ayinhle, futhi kuzothatha isikhathi eside ngemuva kokusebenza komsebenzi wokuvuza.