Valve management is an important function of Digital Electro-Hydraulic Control System (DEH), which has important significance for the safety and economic operation of the unit. In view of the abnormal problem occurred in the valve switching process, a 600MW nozzle governing steam turbine is taken as an example in this paper, and then its valve management theory model is established. In order to improve the performance and trait of the valve control, the opening order of the governing valve, the flow proportion and bias factor and valve overlap degree function are amended, and the governing valve flow characteristic curve is obtained in sequence valve operation based on the field test and theoretical calculation, which provides certain reference for the optimization of valve management in nozzle governing steam turbine.
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