Letoto lena la valve ea poleiti e foufetseng e bōpehileng joaloka fene le boetse le bitsoa valve ea khalase, valve ea flap, valve ea fan, 'me ke sesebelisoa se ka khaolang sebaka sa khase se hlokoang ke GB6222–86 "Melao ea Polokeho ea Khase ea Indasteri". E sebelisoa tsamaisong ea liphaephe tsa khase tse mahareng tsa likhoebo tsa indasteri le tsa merafo, tsamaiso ea masepala, tšireletso ea tikoloho le liindasteri tse ling, haholo-holo e loketse ho khaola ka ho feletseng likhase tse chefo, tse kotsi le tse tukang. E boetse e loketse ho sebelisoa e le poleiti e foufetseng qetellong ea phaephe ho khutsufatsa nako ea tlhokomelo kapa ho hokahanya sistimi e ncha ea phaephe. ​​Ha e bapisoa le lisebelisoa tse ling tsa valve tse etsang ho khaola ka ho feletseng phaepheng, letoto lena la valve ea poleiti e foufetseng e bōpehileng joaloka fene le na le litšobotsi tsa sebopeho se secha, boima bo bobebe, boholo bo bonyenyane, ts'ebetso e bonolo, lebelo la ts'ebetso, le ts'ebetso e tšepahalang ka ho feletseng ea khase e khaotsoeng.