Accepted standards relative to the design of safety valves are based on calculations of the maximum (flow rate) during isentropic expansion through a converging nozzle. The theoretical value is then corrected with an empirical coefficient Kd for a better approach of reality. In this paper, after reviewing the calculation which is the basis for the various existing standards, we indicate the limits of their applications and present a more rigorous method in the case of saturated vapors as well as the first results of systematic computer calculations.

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