1. Ukumelana noketshezi kuncane, futhi i-coefficient yokumelana nayo iyafana naleyo yobude obufanayo.
2. Isakhiwo esilula, usayizi omncane kanye nesisindo esincane.
3. Kuvalwe futhi kuthembekile, ukubekwa uphawu okuhle, futhi kusetshenziswa kabanzi ohlelweni lwe-vacuum.
4. Kulula ukuyisebenzisa, ivuleke futhi ivaleke ngokushesha, kusukela ekuvuleni ukuya ekuvaleni zungezisa nje ngo-90 °, kunenzuzo kusilawuli kude.
5. Ukugcina kalula, isakhiwo esilula se-valve yebhola, indandatho yokuvala uphawu ngokuvamile iyasebenza, kulula ukuyisusa nokufaka esikhundleni.
6. Indawo yokuvala yebhola nesihlalo kuyohlukaniswa nabezindaba uma igcwele noma ivaliwe, ngaphandle kokuguguleka kwendawo yokuvala yevalvu.
7. Uhlu olubanzi lwezinhlelo zokusebenza, kusukela ezincane kuya kumamilimitha ambalwa, ezinkulu kuya kumamitha amaningana, kusukela ku-vacuum ephezulu kuya ekucindezelweni okuphezulu kungasetshenziswa.