Characteristics of Flat-Seated Valves with Broader Seat-Face : 8th Report, Experimental Research on Disc Valve

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  • 円形弁の研究 : 第8報, 弁座面の幅大なる平面座弁の性能
  • エンケイベン ノ ケンキュウ

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Abstract

This paper presents the results of experiments on flat-seated valves with broader seat-face, discharging water into the air under a constant head of about 194 cm. Five valves were used in all, of which the first four had diameter d smaller than seat-face diameter d1 and the last one had d equal to d1. When the lift of the valves with d<d1 is gradually increased, the stream flowing out separates partially from the seat-face at a certain valve-lift, and then separates completely from the seat-face at a higher lift and becomes free jet. When the valve is closing the free jet finally clings to the seat-face at a very small valve-lift. These are represented by three special points on the characteristic curve of each valve. In case of the valve with d=d1, there are one separating and one clinging point on the curve, just as the valves with d>d1 on which we have already reported. We try to give some explanations for these phenomena hereunder.

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