I-valve yesango laseShayina,I-valve yesiShayinafuthiI-valve yokuhlola yaseShayina: ukuhlaziywa okujulile kwemisebenzi nokusetshenziswa kwazo
Ama-valve esango lamaShayina,Ama-valve embulunga aseShayinafuthiAma-valve okuhlola amaShayina izinhlobo ezintathu zama-valve ezivamile, ngalinye linemisebenzi ehlukene kanye nokusetshenziswa. Ngezansi sizohlaziya izici nezimo zokusetshenziswa kwalawa ma-valve amathathu ngokujula.