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Calclating Cv from Orifice Diameter

Calclating Cv from Orifice Diameter

Calclating Cv from Orifice Diameter

(OP)
Does anyone know the formula for calculating Cv when orifice plate diameter (straight edged) and plate thickness is known? I routinely need to size orifice for Compressed Air and Nitrogen Gas. I would also know the temperature, pressure, specific gravity of the fluid medium. I have a program already written to size valves etc. based on a known Cv value and would like to calculate Cv from orifice diameter. Can anyone help?  

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