Influence of Effective Head on the Characteristics of Flat-Seated Disc Valve, Part 1 : 9th Report, Experimental Research on Disc Valves

Abstract

In order to answer the question asked by Prof. T. Uematsu in the discussion as to 7th Report of this research, we made a series of experiments with water on two disc valves, one d=28mm in diameter and the other, d=30.2mm in diameter. In these experiments lifting force P and discharge Q were measured at each valve lift l and effective head H was varied in 6 stages from 194 cm down to 9cm. From the results we can presume that, even if H is considerably larger than 194cm, P/H and Q/l√H would be higher or lower than the case where H=194cm by only a few per cent, as far as cavitation does not occur.