Instruction Book: The Quick Action Automatic Brake (Google eBook)

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Duquesne Printing & Publishing Company, 1893 - Westinghouse air-brake - 64 pages
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Page 7 - ... port, retaining the pressure in the main reservoir, and then permits a portion of the air in the train-pipe to escape. To release the brakes, he moves the handle to the extreme left, which allows the air in the main reservoir to flow freely into the brake-pipe, restoring the pressure and releasing the brakes. A valve called the Conductor's Valve is placed in each car, with a cord running...
Page 17 - ... length that the piston must travel three inches before the groove is covered by the packing leather. A small quantity of air, such as results from a leak, passing from the triple valve into the...
Page 6 - ... and its slide-valve to a position which will allow the air in the auxiliary reservoir to pass directly into the brakecylinder and apply the brake. A sudden or violent /reduction of the air in the train-pipe produces the same effect, and in addition...
Page 60 - ... carry the maximum pressure in the main reservoir before connecting to a train. On long down-grades it is important to be able to control the speed of the train, and at the same time to maintain a good working air-pressure. This is readily accomplished on ordinary gradients, where the pressure-retaining valve is not necessary, by running the pump at a good speed, so that a comparatively high pressure will have been accumulated in the main reservoir while the brakes are on, and which when released...
Page 5 - VALVE, which regulates the flow of air from the main reservoir into the brake pipe for releasing the brakes, and from the main train or brake pipe to the atmosphere for applying the brakes.
Page 69 - Fig. 169, completing the cycle of its movement. Coincident with the reciprocal movements of the main steam and air pistons, air from the outside atmosphere is drawn alternately into the respective ends of the air-cylinder 63, through the screened inlet 106 at W, chamber/'', and receiving-valves 86 to the left, Fig.
Page 7 - ... are forced in the opposite direction to their normal position, opening communication from the train-pipe to the auxiliary reservoir, and permitting the air in the brakecylinder to escape to the atmosphere, thus releasing the brakes. If the engineer wishes to apply the...
Page 6 - ... the brake pipe to the auxiliary reservoir, or (2) to restore the supply from the train pipe to the auxiliary reservoir, at the same time letting the air in the brake cylinder escape, which releases the brakes.
Page 74 - T, and to the duplex gauge at R and W, respectively for main reservoir and train-pipe pressures. The gauge-pipe from R should be extended to the air-pump governor, which latter device should be set to stop the pump at 85 to 100 pounds pressure, thus providing for an excess pressure of 15 to 30 pounds above standard train pipe pressure of 70 pounds per square inch. The amount of excess pressure required depends upon the length of trains and character of the road whether level or with long and...
Page 45 - Stevens. To find the proportion of cylinder lever: Multiply the whole length of the lever by either the required leverage or the total brake beam leverage, and divide by the sum of both; the result will give the length of one end of the lever. If the required leverage is greater than the total brake beam leverage, the long end of the lever must go next to the cylinder, if less, the short end must go next to the cylinder. Dead levers must be made in the same proportion as the live truck levers. EXAMPLE...

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