Abstract

1. The values of the diaphragm discharge coefficients which have moduli between 0.4 and 0.6 and are adopted in the national standards are higher than the corresponding experimentally obtained values. The mean-square error of the mean value of the basic diaphragm discharge coefficient in the range of 0.35 to 0.8 moduli varies between 0.05 and 0.12%, and the mean-square error of a series of measurements varies between 0.23 to 0.59% 2. The investigation of discharge coefficients of restricting devices in precision discharge-meters by means of modern method of experimental data analysis remains a pressing problem.

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