TY JOUR TI IMPROVING THE EFFICIENCY OF THE WATER AND GAS UNIT FUNCTIONING KW friction and wear KW gas water heater KW membrane KW valve KW magnet KW Venturi nozzle. JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Pet'ko, V.G. AU Nikitina, I.P. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov