TY JOUR TI EVALUATION OF HYDRAULIC CONTROL OF THE CIRCUIT OF INDIVIDUAL SYSTEM OF HEATING KW individual heating system KW differential pressure regulator KW hysteresis KW hydraulic operating mode KW valve authority JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Usikov, S.M. AU Starikova, T.S. PY 2021 IS 6 PB Belgorod State Technological University named after V.G. Shukhov