Yonke injongo yokuvala ikhebula kuphinde kubizwe ngokuthi yonke injongo yokuvala ikhebula, okokusebenza okuhlukahlukene njengesondo lesandla se-valve nentambo eguquguqukayo ezungeze isibambo sokushintsha, isibambo sikagesi nesibambo, izibambo zeminyango yekhabethe likagesi, njll., bese uzungeza ngemuva ukuze ubambe uhlobo lokukhiya ikhebula. imbobo yomzimba (bamba kuphela ikani lokukhiya ikhebula ezimbotsheni zekhebula), kuze kube yilapho ikhebula seliboshiwe ngokuqinile ukuze kuxegiswe umzimba wokukhiya ikhebula, bese ulengisa ingidi yezokuphepha kanye nomaka bokukhiya.