This paper presents a carefully validated compressible Euler-Euler CFD model for vapor, gas and pseudo-cavitation in oil-hydraulic flows. LES turbulence modelling is used and highly recommended for cavitation simulations. The focus is on determining the empirical parameters within the cavitation models for hydraulic oil by comparing CFD results to experiments in a realistic and transparent valve. The cavitating flow is visualized and measured for numerous operating points using a high speed camera and the method of shadowgraphy. The amount of dissolved air can be adjusted and measured in the test rig. By degassing, it is possible to completely suppress gas cavitation and thus ensure states of pure vapor cavitation and measure these separately.