TY JOUR TI DIESEL INJECTOR PUMP WITH RING CONTROL VALVE KW pump injector KW annular valve KW control valve KW diesel engine JO Vestnik of Kazan State Agrarian University AU Gabdrafikov, F.Z. AU Aysuvakov, I.N. AU Galiev, I.G. PY 2020 IS 15 PB Kazan state agrarian University