International Library of Technology · Scranton, International Textbook Co. · leaf 485
atic air equipment,however, this is not so. Figs. 66 and 67 are diagramsillustrating the difference. In Fig. 66, when valve K^ is 52 ELECTRIC RAILWAYS. §25 open, pump P stores air in reservoir R, until gauge G showsthe desired maximum pressure; K^ is then closed. Toapply the brake, valve Ais… … Fig. springs s, s can pull the shoe from the wheel. Valves Kand K^ should never be opened at the same time, as thisallows air to pass from R direct to the atmosphere, causinga great waste of air. In actual practice, valves K, K^, and K^are operated by a single handle in such a way that waste-ful…
Electrical engineering
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