The Air Brake Catechism and Instruction Book on the Construction and Operation of the Westinghouse and the New York Air Brakes; With a List of Examination Questions for Enginemen and Trainmen (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910. Excerpt: ... against the pressure of the main reservoir, lir" in- a and the spring 11; when revolved to the left forces the exhaust valve 9 off its seat against the pressure of the spring 10 and the brake cylinder air. To apply the brake the handle 4 is moved to the right. With valve 8 moved down off its seat, main reservoir air in o passes through b, b1 and b--see Fig. 3--and out at x--see Fig. 2--through the piping leading to the Double Check valves and cylinders. Exhaust valve 9 at this time is on its seat as shown in Fig. 2, so that no air can pass out through c to the exhaust. To release the brake the handle 4 is moved to the left, which allows main reservoir air valve 8 to close and then open exhaust.vaive 9, jo that air in the cylinders can pass out to the atmosphere. When handle 4 is in mid-position, both valves are closed so that they are "on lap." A leather washer 6 prevents leakage from b to the atmosphere when the brake is applied; spring 7 holds shaft 2 against this washer when there is no compressed air in this part of the valve--see Fig. 3. To regulate the pressure of the air fed from the main reservoir to this valve, a G-6 Slide Valve Feed Valve is used, located on the pipe between the reservoir and brake valve and set to close at 45 pounds. This reducing valve regulates the brake cylinder pressure to the proper amount, and also restricts the flow of air and assists the engineer in making moderate applications. The Double Check Valve shown in Fig. 4 is located in the pipe between the triple valve and the cylinders, in a horizontal position so that it will not open or close by gravity. The triple valve is coupled to one end, the straight air brake valve at the other. The brake cylinder can be coupled to either side, as shown, one side can be used for th...