Abstract
Concerning the vortex shedder used in the Karman vortex flowmeter, the flow resistances of cylindrical bodies having various cross sections in a circular pipe are given by the general equation in the previous paper. In the present paper, it is confirmed that the equation holds for the vortex shedder having a large blockage ratio. Then, the same idea is applied to the hydraulic losses of flow control components asymmetrical to the cross section of the pipe, such as a slice valve, a butterfly valve and a cock. Consequently, these hydraulic losses hitherto given by a chart or a table are given the following general equation : ζ=C[(1-β)/β2]n, where β is the open ratio.
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