Venturi tube throttle element calculation formula
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This is the calculation sheet for a Venturi tube flow meter. How were the coefficients in the formula at the bottom obtained? Using the standard formulas, it’s not possible to calculate these coefficients either. Is there anyone who can help?
This is the calculation formula for differential pressure orifice plates. The coefficient in front represents the flow coefficient, which is determined by the manufacturer based on the product specifications; the calculation standard is ISO 5167 as indicated in the second row
The venturi tube is designed and manufactured in accordance with the national standard GB/T2624-93, and calibrated in accordance with the calibration specification JJG640-94.
Plugging the values from the calculation sheet into the formulas in the standards yields a result that differs from the value obtained using the simplified formulas in the calculation sheet
I don’t understand why a venturi tube is needed; the 850 model venturi tubes are very expensive. Moreover, this venturi design isn’t very reasonable either; I think B is a bit small.
The factory produces flow meters according to your requirements, and determines a series of coefficients based on the actual performance of those flow meters