Ukushisa komkhondo ukusetshenziswa kwenani elilawulwayo lokushisisa okungaphezulu kukagesi kumapayipi, amathangi, ama-valve noma izinto zokusebenza ukuze zigcine izinga lokushisa (ngokushintsha ukushisa okulahlekile ngokufaka ukufakwa, okubuye kubizwe ngokuthi ukuvikela isithwathwa) noma ukuphazamisa ukukhuphuka kwezinga lokushisa kwalo. .