On the basis of current knowledge covering a wide range of vortex devices, the methodology of model tests was developed (in pilot-plant scale) for liquid flow in vortex regulators. Our paper presents selected investigation results related to the influence of such dimensionless geometric parameters as d_out/d_in, h_c/d_in, D/d_in, R_o/din, cos θ, and constant K, as well as spray cone angle (γ) on liquid flow throttling effect for regulators with conical vortex chamber shape. Developed empirical formulae allow for a rational selection of geometrical parameters (or a resistance coefficient) for such regulators for applications in environmental engineering, which was demonstrated in the example.