[en] An orifice flow system is developed and could be used for calibration of high vacuum gauges ranging from 10.3 mbar to 10.6 mbar with argon gas. A standard transfer gauge (SRG) confirms the applicability of the experimental set-up and obtained results. It is shown that this standard system could be used for calibration of high vacuum gauges with in the experimental error reported. The experimental results obtained .in two pressure zones are numerically modeled. A three dimensional system of Navier-Stokes equations is reduced to one dimension governing equations using symmetric technique. A finite difference method is applied to this reduced system together with prescribed boundary conditions. An SaR iterative scheme is employed to solve the system up to a fair accuracy. Numerical solutions of ID system are compared and reported to close accuracy with the experimental data. (author)