Based on aqueous medium with low viscosity, poor lubrication, high vapor pressure and corrosion, and other special physical, chemical properties, this paper analyzed the pure water flow through the valve port, the cavitation corrosion, spiral vortex, energy loss, temperature rise and other issues may occur near the entrance. Flow field model has been established by the SolidWorks software. And the internal flow field in visual simulation analysis has been done through the FLUENT software. The pressure, speed, temperature, turbulent kinetic energy cloud pictures have been obtained, the analytical results has been validated. Meanwhile it prepared for structure optimization of pilot valve. Keywords :water hydraulic;; FLUENT;; twin flapper -nozzle valve;; CFD
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