The hydraulic poppet valve is one of the most important component in the hydraulic transmission and control,whose characteristic of the inner flow filed influences directly the valve s performance.

In the paper, based on reading and studying a great number of references about fluid dynamic technique and numerical computing methods of flow field, 3-D Numerical simulations and visual analysis of the flow field in hydraulic poppet valve with inside flow work condition were obtained by CFD (Computational Fluid Dynamics) software Fluent.

The hydraulic poppet valve is one of the most important component in the hydraulic transmission and control, whose characteristics of the inner flow field directly influents the valve s performance, especially the moving valve cone.

The effect of structural forms,angle of poppet, and chamfer of valve seat on the flow field within cone valve is investigated emphatically by analyzing the form of stream line, the data and distribution of pressure and velocity.

The effect of structural forms, angle of poppet, and chamfer of valve seat on the flow field within cone valve is investigated emphatically by analyzing the form of stream line, the data and distribution of pressure and velocity.

Introduce how the valve realize the run-off and overflow operating principle by unfolding valve structure drawing,when the system pressure lower or higher than the regulated value,by the cone valve closed and opened,realize the overflow action.

The manipulation smoothness,the hydraulic pressure shock,the thermal loading,the unloading oil pressure,and the dynamic response of an electro-hydraulic control system with the poppet valves for a tractor were studied indetail.

Combining experimental solution and CFD analyses,a method to appraise noise of poppet valve was studied.

To improve the response speed of on-off solenoid valve of big flux,detailed analysis on poppet valve is given and an on-off solenoid valve with movement of both spool and cover is designed.