Iimpawu kunye neeKhetho zoFakelo-Ongeziweyo
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Iimpawu zesingxobo Kwaye iinketho
Kukho iindawo ezahlukahlukeneyo zesikhwama sokupakisha, ezifana ne-valve yomoya, esetyenziswa ngokubanzi kwisikhwama sokupakisha ikhofi ukuqinisekisa ukuba ikofu ngaphakathi "inokuphefumula".Umzekelo, uyilo oluqhelekileyo lokubamba lomzimba womntu lusetyenziswa ngokubanzi kwizinto ezinzima.kwipakethe.