Ama-valves we-check adlala indima ebalulekile ezinhlelweni ezahlukahlukene zezimboni ngokuqinisekisa ukugeleza okungaqondile koketshezi nokuvimbela ukugeleza emuva. Lawa madivayisi ayizinto eziyisisekelo ezinhlelweni ezibandakanya ukunyakaza koketshezi, amagesi ngisho nezinsimbi. Ukuqonda ukuthi ama-valve asebenza kanjani nezinhlobo zawo ezahlukahlukene angasiza ekukhetheni ingxenye efanele yezinhlelo ezithile, kuthuthukise uhlelo