The aim of the research was optimization of the shape of the milk part of claw chamber using Computational Fluid Dynamics (CFD) software. The results of the liquid flows simulation in claw models of various shapes, in particular with different aspect ratios (height to diameter ratios) were presented. The velocity of the fluid and the interactions between different streams of liquid flowing out of the inlets were analyzed. Research was carried out at a flow of fluid from 0 to 10 kg•s-1, a vacuum of 38 to 50 kPa, simulating air injection into the model of the claw. It was found that the best conditions are for models with an aspect ratio of about 3. Computed liquid flow rate ranged from 0.05 to 1.2 m•s-1.