Ukuvala inzalo nge-steam ukubeka umkhiqizo ekhabetheni lokuvala inzalo. Isitimu esinezinga lokushisa eliphezulu sikhipha ngokushesha izinkanyezi zokushisa, okubangela ukuthi iphrotheni yebhaktheriya ibambene futhi iguqule ukuze kufezwe injongo yokuvala inzalo. Isici sokuvala inzalo ngesitimu okumsulwa ukungena okuqinile. Amaprotheni kanye ne-protoplasmic colloid akhishwa futhi ahlanganiswe ngaphansi kwezimo ezishisayo nezinomswakama. Uhlelo lwe-enzyme lubhujiswa kalula. I-steam ingena kumaseli bese ijiya ibe emanzini, okungakhulula ukushisa okungaba khona ukukhulisa izinga lokushisa futhi kuthuthukise amandla okubulala inzalo.
Izici zemishini ye-Steam generator: izinga lokushisa eliphezulu kanye nokuvala inzalo yesikhashana. Ngokusetshenziswa komjikelezo wamanzi wokuvalwa inzalo, amanzi ethangini lokuvala inzalo ashiselwa aze afike ezingeni lokushisa elidingekayo ukuze kubulawe inzalo kusenesikhathi, ngaleyo ndlela afinyeze isikhathi sokuvala inzalo futhi athuthukise ukusebenza kahle komsebenzi. Yonga amandla futhi ukhulise ukukhiqizwa. Indlela yokusebenza esetshenziswa enqubweni yokuvala inzalo ingaphinda igaywe kabusha, yonge amandla, isikhathi nokusetshenziswa kwabasebenzi kanye nezinsizakusebenza, kanye nokunciphisa izindleko zokukhiqiza. Ngesikhathi sokuvala inzalo, amathangi amabili asetshenziswa ngokushintshana njengamathangi okuvala inzalo, okwandisa okukhiphayo ngasikhathi sinye. Ngemikhiqizo yokupakisha eguquguqukayo, ikakhulukazi ukupakisha okukhulu, isivinini sokungena kokushisa siyashesha futhi umphumela wokuvala inzalo muhle.