TY JOUR TI About perspective constructions hydraulic agricultural machinery KW forestry machinery KW hydraulic system KW pilot controlled check valve KW throttle-relief valve. JO Actual directions of scientific researches of the XXI century: theory and practice AU Fokin, S.. AU Khramchenko, A.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov