Isitulo sevalve yebhabhathaneyinxalenye esuswayo ngaphakathi kwevalve, indima ephambili kukuxhasa ipleyiti yevalve ivuleke ngokupheleleyo okanye ivalwe ngokupheleleyo, kwaye yenze i-vice yokutywina.Ngokuqhelekileyo, ubukhulu besihlalo bubukhulu becaliber yevalve.Imathiriyeli yesihlalo sevalve yebhabhathane ibanzi kakhulu, imathiriyeli esetyenziswa ngokuqhelekileyo kukutywina okuthambileyo kwe-EPDM, NBR, PTFE, kunye nentsimbi eqinileyo yokutywina imathiriyeli ye-carbide.Okulandelayo siza kwazisa nganye nganye.
I-1.EPDM-Xa kuthelekiswa nezinye irabha yenjongo jikelele, irabha ye-EPDM ineenzuzo ezinkulu, ezibonakaliswa ikakhulu kwi:
A. Ixabiso elibi kakhulu, kwiibhanana ezisetyenziswa ngokuqhelekileyo, i-EPDM ye-rubber ye-rubber seal iyona nto ilula kakhulu, unokwenza ukugcwalisa okuninzi, ukunciphisa iindleko zerabha.
B. Izinto ze-EPDM zokuguga, ukumelana nelanga, ukumelana nobushushu, ukuxhathisa umphunga wamanzi, ukuxhathisa kwi-radiation, ilungele i-asidi ebuthakathaka kunye ne-alkali media, iipropati ezintle zokugquma.
C. Uluhlu lobushushu, elona lisezantsi linokuba -40 ° C - 60 ° C, linokuba yi-130 ° C iimeko zokushisa zokusetyenziswa kwexesha elide.
I-2.NBR-i-oil-resistant, i-heat resistant, i-resistant resistant, kwaye kwangaxeshanye inokumelana kakuhle namanzi, ukutywinwa komoya kunye neempawu ezigqwesileyo zokudibanisa.Ukusetyenziswa okungakumbi kumbhobho we-oyile, into engalunganga kukuba ayixhathisi kumaqondo obushushu aphantsi, ukuxhathisa kwe-ozone, iipropathi ezisezantsi zokugquma, ukuqina kwakhona kubanzi.
3. PTFE: iplastiki fluorine, le nto inokumelana kakhulu neasidi kunye alkali, kang ezahlukeneyo izinyibilikisi organic ukusebenza, lo gama impahla ukumelana lobushushu eliphezulu, ingasetyenziswa ngokuqhubekayo kwi 260 ℃, ubushushu eliphezulu linokufikelela 290-320 ℃ , I-PTFE yabonakala, yasombulula ngempumelelo imboni yeekhemikhali, i-petroleum, i-pharmaceutical kunye namanye amashishini kwinkalo yeengxaki ezininzi.
4. Isitywina esiqinileyo sentsimbi (i-carbide): isihlalo sevalve yesitywina esiqinileyo sinokuxhathisa okuhle kakhulu kubushushu obuphezulu kunye noxinzelelo oluphezulu, ukumelana nokugqwala, ukunxitywa kweempawu zokumelana, kuhle kakhulu ukwenza iziphene zezinto zokutywina ezithambileyo azikwazi ukumelana nayo. ubushushu obuphezulu kunye noxinzelelo oluphezulu, kodwa izinto zokutywina ezilukhuni kwiimfuno zokusetyenzwa kwenkqubo ziphezulu kakhulu, eyona nto ingalunganga yentsimbi enzima yokutywina isihlalo sokutywina isihlalo sokutywina iyasebenza, iya kuba kwixesha elide emva kokusebenza komsebenzi ukuvuza.