Aim. Study of the kinetics of erosive destruction of valve seal elements during the flow of working media with high energy parameters. Method. The object of research is the locking and regulating elements of the valve seal, namely the valve and seat. The model of hydro-erosion wear of the destruction of these elements was constructed. This describes a complex of structural parameters of shut-off knots, as well as parameters that reflect the physical properties of the working medium and the material of the valve-seat pair.