I-valve yokuhlola i-swing iyi-valve yokuhlola uhlobo lokujika (i-valve engabuyi) enoxhumo olune-flanged. Isetshenziselwa ukuvumela amanzi ukuthi ageleze kuyo ngendlela eyodwa kuphela, futhi i-disc isuka esihlalweni ukuze ivumele ukugeleza ukuya phambili, noma ukushwibeka esihlalweni ukuvimba ukugeleza okubuyela emuva.