Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . Fig. 91. Part Section of Pump Governor 192 ELECTRIC RAILWAYS 97 downward. This moves the sHde valve 3 and uncovers the port B,which is in communication with the chamber C. The air pressurenow in the chamber C forces the piston 4 upward, thereby openingthe switch in the motor circuit, and
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . Fig. 91. Part Section of Pump Governor 192 ELECTRIC RAILWAYS 97 downward. This moves the sHde valve 3 and uncovers the port B,which is in communication with the chamber C. The air pressurenow in the chamber C forces the piston 4 upward, thereby openingthe switch in the motor circuit, and the motor stops. When the airpressure in the reservoir drops slightly, and consequently the pressureabove the diaphragm 1 is reduced, the regulating spring 2 forcesthe diaphragm upward, which also moves the slide valve 3 and con-nects the port B with the exhaust port D. Air from the chamber Cis now exhausted into the atmosphere; the piston 4 moves downwardand closes the switch in the motor circuit; and the pump starts. Thisaction continues, and maintains the required pressure in the mechanism on the upper part of the governor acts so as to causethe switch to open and close very rapidly, and thus avoids unduearcing. The pressure at which the governor cuts out the motor is. ? • -•-•---• -- • ? ?? ? -^ i^MJJAMMM
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Keywords: ., bookauthoramericantechnicalsoci, bookcentury1900, bookdecade1910
