The butterfly-valve losses in Fig. 6.19b may be viewed as a type of Bernoulli obstruction device, as

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The butterfly-valve losses in Fig. 6.19b may be viewed as a type of Bernoulli obstruction device, as in Fig. 6.39, the €œthroat area€ At in Eq. (6.104) can be interpreted as the two slivers of opening around the butterfly disk when viewed from upstream. First fit the average loss Kmean versus the opening angle in Fig. 6.19b to an exponential curve. Then use your curve fit to compute the €œdischarge coefficient€ of a butterfly valve as a function of the opening angle. Plot the results and compare them to those for a typical flow-meter.

The butterfly-valve losses in Fig. 6.19b
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