.,is full up or full down. In a 30-inch cylinder, for instance,with 12 inch length of valvo orifice, it would be 015 inch.The eccentric for communicating motion to the slide mustalways work at an acute angle to the direction of tho slide,and this lead angle must be greatest the greater the degree… … Fig. 6 is a section through such a slide valve, in which C isthe slide, A A, the outside laps ; F F, the steam ports ; E theexhaust port, and D D, the bars. The slide is best made with an inside lap of fa of an inchon either side. The exhaust port must be from 2 to 2J times as high as thesteam…
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