TY JOUR TI THE CONTACT DEVICES OF POPPET COLUMNS KW contact devices KW mass transfer devices KW range of stable operation KW hydraulic resistance JO Modern Technologies and Scientific and Technological Progress AU Medvedev, D.M. AU Podoplelov, E.V. AU Dement'ev, A.I. PY 2022 IS 2022 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»