I-valve ye-swing ye-swing i-swing i-swing yohlobo lwe-swing ivutha i-valve Isetyenziselwa ukuvumela amanzi ukuba ahambe kwindlela enye, kwaye i-disc ijijeke esihlalweni ukuze ivumele ukuhamba phambili, okanye i-wing kwisitulo sokuvala ukuhamba ngokuhamba.