Iyunithi ye-vacuum feeder ye-ZKS isebenzisa iphampu yomoya ye-whirlpool ekhipha umoya. I-inlet kampompi wezinto zokumuncwa kanye nesistimu yonke yenziwe ibe sesimweni se-vacuum. Izinhlamvu eziyimpushana zezinto ezibonakalayo zimuncwa empompini wezinto ezibonakalayo onomoya ozungezile futhi zakheke zaba umoya ogeleza nezinto. Bedlula ishubhu lezinto zokumunca, bafika ku-hopper. Umoya nezinto ezisetshenziswayo zihlukaniswa kuwo. Izinto ezihlukanisiwe zithunyelwa edivayisini eyamukelayo. Isikhungo sokulawula silawula isimo "sokuvula/ukuvala" sevalvu yomoya kathathu yokuphakela noma ukukhulula izinto.
Kuyunithi ye-vacuum feeder kufakwa umoya ocindezelwe obhekene nomshini ophephethayo. Lapho ukhipha okokusebenza ngaso sonke isikhathi, umoya ocindezelweyo ushaya ngokuphambene isihlungi. Impushana enamathiselwe phezu kwesisefo ishaywa umoya ukuze kuqinisekiswe ukuthi kudonsa okujwayelekile.