Iimveliso eziphambili ze-CGCV: i-valve yebhola ehlanganisiweyo ngokupheleleyo, i-valve yebhola yegesi yendalo, i-valve yebhola esemgangathweni, i-valve yebhola ejikelezayo, i-valve yesinyithi ukuya kwi-valve yesinyithi, i-valve yesinyithi esemgangathweni esithathu, i-valve yolawulo, i-valve yesango, i-valve yeglobe,