Computational Fluid Dynamics (CFD) simulations of cavitating flow through water hydraulic poppet valves were performed using advanced RNG k-epsilon turbulence model.Theflow was turbulent, incompressible and unsteady, for Reynolds numbers greater than 43000. The working fluid was water, and the structure of the valve was simplified as a two dimensional axisymmetric geometrical model. Flow field visualization was numerically achieved. The effects of inlet velocity, outlet pressuere, opening size as well as poppet angle on cavitation intensity in the poppet valve were numerically investigated. Experimental flow visualixation was conducted to capture cavtation images near the orifice in the poppet valve with 30