Izinto zokwakha izingxenye ze-valve kufanele zikhethwe ngokuya ngalezi zinto ezilandelayo:
1. Ingcindezi, izinga lokushisa kanye nezici zendlela yokusebenza.
2. Amandla engxenye kanye nomsebenzi wayo ku-i-valveisakhiwo.
3. Inamandla okwenza kangcono.
4. Uma lezi zimo ezingenhla kuhlangatshezwana nazo, kufanele kube nezindleko eziphansi.
Izinto zesiqu
Ngesikhathi sokuvulwa nokuvalwa kwe-valve, isiqu se-valve sithwala amandla okucindezela, ingcindezi kanye ne-torsion, futhi sithintana ngokuqondile nendawo.Ngesikhathi esifanayo, kukhona ukunyakaza okuhambisanayo okuhambisana nokupakisha.Ngakho-ke, i-valve stem impahla kufanele ibe yanele ekushiseni okucacisiwe.Amandla nokuqina komthelela, izinga elithile lokumelana nokugqwala nokumelana nokuklwebheka, nokwenza okuhle.
Izinto ezisetshenziswa kakhulu ze-valve stem yilezi ezilandelayo.
1. Insimbi yekhabhoni
Uma isetshenziswa emanzini nasezindaweni zesitimu ezinomfutho ophansi kanye nezinga lokushisa eliphakathi nendawo elingeqi ku-300 ℃, i-A5 ejwayelekile ye-carbon steel ngokuvamile isetshenziswa.
Uma isetshenziswa emanzini kanye ne-steam medium enengcindezi ephakathi nendawo nezinga lokushisa eliphakathi nendawo elingeqi ku-450 ℃, kusetshenziswa i-carbon steel yekhwalithi ephezulu engu-35.
2. Insimbi ye-alloy
I-40Cr (insimbi ye-chrome) ivame ukusetshenziswa lapho isetshenziselwa ukucindezela okuphakathi nokucindezela okuphezulu, futhi izinga lokushisa eliphakathi alidluli ku-450 ℃ emanzini, umusi, uphethiloli neminye imidiya.
38CrMoALA nitriding steel ingasetshenziswa uma isetshenziswa emanzini, isitimu nakweminye imidiya enomfutho ophezulu kanye nezinga lokushisa eliphakathi nendawo elingeqi ku-540℃.
I-25Cr2MoVA chromium molybdenum vanadium steel ngokuvamile isetshenziswa uma isetshenziswa endaweni enengcindezi ephezulu enezinga lokushisa eliphakathi nendawo elingeqi ku-570 ℃.
Ezintathu, insimbi engagqwali emelana ne-asidi
Isetshenziselwa imidiya engagqwali futhi egqwalile ebuthakathaka enokucindezela okuphakathi nokucindezela okuphezulu, futhi izinga lokushisa eliphakathi alidluli ku-450°C.I-1Cr13, 2Cr13, 3Cr13 insimbi engagqwali ye-chromium ingakhethwa.
Uma isetshenziswa kumidiya ebolayo, insimbi engagqwali engamelana ne-asidi efana ne-Cr17Ni2, 1Cr18Ni9Ti, Cr18Ni12Mo2Ti, Cr18Ni12Mo3Ti, kanye nensimbi eqinisa imvula engu-PH15-7Mo ingakhethwa.
Okwesine, insimbi ekwazi ukumelana nokushisa
Uma isetshenziselwa ama-valve anezinga lokushisa eliphezulu izinga lokushisa lawo eliphakathi nendawo lingadluli ku-600℃, insimbi engu-4Cr10Si2Mo martensitic ekwazi ukumelana nokushisa kanye nensimbi engu-4Cr14Ni14W2Mo austenitic ekwazi ukumelana nokushisa ingakhethwa.
Isikhathi sokuthumela: Sep-24-2021