The paper establishes a practical model of the digital valve driven by ste-pping motor,and desigens a digital controller,according to the“stochestic”ofthe model.So a kind of electric closed-loop control of the valve has been fini-sted in the paper,and higher accuracy and dynamic performance may beobtained by using the controller。The paper discusses th“stochestic”of the model and comes to the conclusiontlat in closed-loop control of the digital valve driven by stepping motor,if adeterminate model of the valve is adopted,the ...