Fuel oil grading control assembly, fuel oil system, gas turbine, override valve and fuel oil grading control method

The invention discloses an aero-engine fuel oil grading control assembly, a fuel oil system, a gas turbine, an override valve and a fuel oil grading control method. The grading control assembly comprises a grading bib, a grading valve and the override valve. The grading valve is connected with a first pressure source and a second pressure source and comprises a first pressure output part and a switching piece. The override valve is connected with the second pressure source and is provided with a second pressure output part, and the second pressure output part and the first pressure output part are connected in parallel to output graded pressure to the graded bib. wherein the control assembly has a first state and a second state. In the first state, the second pressure output part is closed. In the second state, the second pressure output part is opened and communicates with the second pressure source. 一种航空发动机燃油分级控制组件、燃油系统、燃气轮机、超控活门以及燃油分级控制方法，所述分级控制组件包括分级活门；分级阀，与所述第一压力源、第二压力源连接，包括第一压力输出部以及切换件；以及超控活门，与所述第二压力源连接