Isihlalo sevalvu yebhabhathaneliyinxalenye esuswayo ngaphakathi kwivalvu, indima ephambili kukuxhasa ipleyiti yevalvu ivuleke ngokupheleleyo okanye ivalwe ngokupheleleyo, kwaye yenze i-sealing vice. Ngokwesiqhelo, ububanzi besihlalo bubungakanani be-valve caliber. Izinto zesihlalo se-Butterfly valve zibanzi kakhulu, izinto ezisetyenziswa rhoqo yi-soft sealing EPDM, NBR, PTFE, kunye nezinto ze-metal hard sealing carbide. Okulandelayo siza kwazisa nganye nganye.
1. I-EPDM-Xa ithelekiswa nezinye irabha ezisetyenziswa ngokubanzi, irabha ye-EPDM ineenzuzo ezinkulu, ezibonakala kakhulu kwezi:
A. Ixabiso layo liphantsi kakhulu, kwiibhanana ezisetyenziswa rhoqo, isitywini serabha se-EPDM esiluhlaza sesona sikhaphukhaphu, ungenza ukugcwalisa okuninzi, unciphise iindleko zerabha.
B. Ukumelana nokuguga kwezinto ze-EPDM, ukumelana nokukhanya kwelanga, ukumelana nobushushu, ukumelana nomphunga wamanzi, ukumelana nemisebe, ifanelekile kwi-acid ebuthathaka kunye ne-alkali media, kunye neempawu ezilungileyo zokuthintela ukugquma.
C. Uluhlu lobushushu, oluphantsi lungaba yi--40 ° C - 60 ° C, lungaba yi-130 ° C iimeko zobushushu zokusetyenziswa ixesha elide.
2. I-NBR-imelana neoyile, imelana nobushushu, imelana nokuguguleka kwaye kwangaxeshanye inokumelana kakuhle namanzi, ivala umoya kwaye ineempawu ezintle zokubopha. Ukusetyenziswa okungakumbi kwipayipi yeoyile, ingxaki kukuba ayimelani namaqondo obushushu aphantsi, imelana ne-ozone, iipropati zokuthintela ukugquma ezingalunganga, kwaye ikwayinto eqhelekileyo.
3. I-PTFE: iplastiki ye-fluorine, le nto inokumelana okukhulu ne-asidi kunye ne-alkali, inamandla okumelana ne-organic solvents ezahlukeneyo, ngelixa le nto inokumelana nobushushu obuphezulu, ingasetyenziswa rhoqo kwi-260 ℃, ubushushu obuphezulu bunokufikelela kwi-290-320 ℃, i-PTFE yabonakala, yasombulula ngempumelelo ishishini leekhemikhali, ipetroli, amayeza kunye nezinye izimboni kwicandelo leengxaki ezininzi.
4. Itywina lesinyithi eliqinileyo (ikhabhayithi): Izinto zesihlalo sevalvu yesinyithi eziqinileyo zinokuxhathisa kakuhle kakhulu kubushushu obuphezulu kunye noxinzelelo oluphezulu, ukumelana nokugqwala, iimpawu zokuxhathisa ukuguguleka, zilungile kakhulu ukuhlawula iziphene zezinto zokutywina ezithambileyo azixhathisi kubushushu obuphezulu kunye noxinzelelo oluphezulu, kodwa izinto zokutywina eziqinileyo kwiimfuno zokusetyenzwa kwenkqubo ziphezulu kakhulu, ingxaki kuphela yokusebenza kokutywina kwesihlalo sevalvu yesinyithi elukhuni ayilunganga, kuya kuba emva kwexesha elide emva kokusebenza komsebenzi wokuvuza.