抄録
Control valves play very important role as final control elements in process control system and most of them are driven by the pneumatic pilot valve.
Electro-pneumatic positioner systems are analysed considering non-linear property of a pneumatic pilot valve, and characteristic model are derived. The action of the pneumatic pilot valve is constituted with different modes, so there exists a strong non-linearity.
The experimental data are in satisfactory agreement with the calculated responses considering the pilot valve non-linearity
