Appletons Cyclopdia of Technical Drawing Embracing the Principles of Constr
Appletons Cyclopdia of Technical Drawing Embracing the Principles of Constr
W E William Ezra Worthen
The book Appletons Cyclopdia of Technical Drawing Embracing the Principles of Constr was written by author W E William Ezra Worthen Here you can read free online of Appletons Cyclopdia of Technical Drawing Embracing the Principles of Constr book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Appletons Cyclopdia of Technical Drawing Embracing the Principles of Constr a good or bad book?
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The seats of the valves are often made of wood, set endways. Large valves, from their great weight and flow of water through them, are noisy in both seating and lifting. This is met in the balanced valves by slower move- ments of the piston ; but present practice is to obtain outlets by increasing the num- ber of valves, the total area of the aper- tures, and the speed. Fig. 849 is a single-beat direct lift- valve guided by three feathers on its under side, which slide in the cylindrical part o...f the pipe. The feathers are of a screw form, by which a rotary motion is given to the valve through the flow of the water, which prevents its beating on the same parts of the seat ; usually the FIG. 849. FIG. 8so. 374 MACHINE DESIGN AND MECHANICAL CONSTRUCTIONS. FIG. 851. FIG. 852. feathers are straight, and often four instead of three. Fig. 850 is a poppet-valve guided by a central stem ; both these valves have conical faces and seats, with generally an inclination of 45 to the axis of the valve.
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