I-valve iyisici sokulawula esingaqondile.Lapho Udlula i-valve, isisetshenziswa esisebenzayo singageleza kuphela ngendlela ethile.Isebenza, uma isiqondiso sengcindezi emaphakathi sishintsha.Ivalvu isebenza ukumisa ukubuya kwe-meduim ohlelweni.Ngakho-ke, umkhiqizo ubizwa nangokuthi i-valve engabuyi.