Isihlalo se-Butterfly valvekuyingxenye ekhiphekayo ngaphakathi kwevalvu, indima eyinhloko ukusekela ipuleti le-valve livuleke ngokugcwele noma livalwe ngokugcwele, futhi kwakha i-vice yokuvala. Ngokuvamile, ububanzi besihlalo bulingana nobukhulu be-valve. Izinto zesihlalo se-Butterfly valve zibanzi kakhulu, izinto ezivame ukusetshenziswa ziyi-EPDM, i-NBR, i-PTFE, kanye nensimbi eqinile ebeka uphawu ye-carbide. Okulandelayo sizokwethula ngamunye ngamunye.
1.EPDM-Uma kuqhathaniswa nenye irabha yenhloso evamile, irabha ye-EPDM inezinzuzo ezinhle, ezibonakala ikakhulukazi ku:
A. Ibiza kakhulu, kubhanana osetshenziswa kakhulu, uphawu lwenjoloba eluhlaza lwe-EPDM lulula kakhulu, ungenza ukugcwalisa okuningi, unciphise izindleko zenjoloba.
B. Ukumelana nokuguga kwe-EPDM, ukumelana nokuchayeka elangeni, ukumelana nokushisa, ukumelana nomhwamuko wamanzi, ukumelana nemisebe, kulungele i-asidi ebuthakathaka kanye nemidiya ye-alkali, izakhiwo ezinhle zokuvikela.
C. Ibanga lokushisa, eliphansi kakhulu lingaba -40 ° C - 60 ° C, lingaba yizimo zokushisa ezingu-130 ° C zokusetshenziswa isikhathi eside.
I-2.NBR-imelana nowoyela, ukumelana nokushisa, ukumelana nokugqoka futhi ngesikhathi esifanayo inokumelana okuhle kwamanzi, ukuvalwa komoya kanye nezakhiwo ezinhle kakhulu zokubopha. Izicelo ezengeziwe epayipini likawoyela, ububi ukuthi alimelani namazinga okushisa aphansi, ukumelana ne-ozone, izakhiwo ezingezinhle zokufaka uwoyela, ukunwebeka nakho kujwayelekile.
3. PTFE: ipulasitiki fluorine, le nto inokumelana okuqinile ne-asidi ne-alkali, kang ukusebenza okuhlukahlukene kwezincibilikisi eziphilayo, kuyilapho impahla ishisa ukumelana nokushisa, ingasetshenziswa ngokuqhubekayo ku-260 ℃, izinga lokushisa eliphakeme kakhulu lingafinyelela ku-290-320 ℃, i-PTFE yavela, ixazulule ngempumelelo imboni yamakhemikhali, i-petroleum, ezinye izinkinga eziningi zemithi kanye nezinye izinkinga emkhakheni wezokwelapha.
4. I-Metal hard seal (i-carbide): impahla yesihlalo se-valve yensimbi eqinile inokumelana okuhle kakhulu nokushisa okuphezulu nokucindezela okuphezulu, ukumelana nokugqwala, izici zokumelana nokugqoka, kuhle kakhulu ukulungisa amaphutha wento ethambile yokuvala uphawu ayimelani nokushisa okuphezulu nokucindezela okuphezulu, kodwa into eqinile yophawu ezidingweni zokucutshungulwa kwenqubo iphezulu kakhulu, okuwukuphela komonakalo okhona ngemuva kokusebenza kanzima kwe-valve yesihlalo isikhathi eside, i-valve yesihlalo izoba buthakathaka isikhathi eside. ukusebenza komsebenzi wokuvuza.