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 nje ukushintshanisa okungu-90 °, kunenzuzo kusilawuli kude.
5. Ukugcina kalula, isakhiwo esilula se-valve yebhola, indandatho yokuvala uphawu ngokuvamile iyasebenza, kulula ukuyisusa nokufaka esikhundleni.
6. Indawo yokuvala ibhola nesihlalo kuyohlukaniswa nabezindaba uma igcwele noma ivaliwe, ngaphandle kokuguguleka kwendawo yokuvala yevalvu.
7. Uhlu olubanzi lwezinhlelo zokusebenza, kusukela ezincane kuya kumamilimitha amaningana, ezinkulu kuya kumamitha amaningana, kusukela ku-vacuum ephezulu kuya ekucindezelweni okuphezulu kungasetshenziswa.