Ivalve yetayara licandelo elibaluleke kakhulu kukhuseleko kwaye kuphela ziivalvu ezivela kwimithombo eyaziwayo yomgangatho ocetyiswayo.
Iivalvu ezikumgangatho ophantsi zinokubangela ukuqhawuka kwetayara ngokukhawuleza kwaye izithuthi zingalawuleki kwaye zinokuba nokuntlitheka. Kungenxa yesi sizathu ukuba i-Fortune ithengise kuphela kwiivalvu ezisemgangathweni ze-OE ezine-ISO/TS16949 evunyiweyo.