Pocket ed. of locomotive engineering; a new complete series of questions and answers treating on the first, second and third years' progressive examination questions; air brake and by Fisher Ira Walter 1879-

Author:Fisher, Ira Walter, 1879- [from old catalog] & Williams, John J., [from old catalog] joint author
Language: eng
Format: epub, pdf
Tags: Locomotives
Publisher: [Chicago?]
Published: 1911-03-25T05:00:00+00:00

brake pipe) the auxiliary and brake cylinder will equalize at 88 pounds (with 8 inch piston travel).

The high speed reducing valve is composed of a slide valve, piston and a regulating spring, in a suitable cast body. The slide valve is connected to the piston, and the piston rests on the regulating spring. The slide valve has a triangular port, that registers with an oblong port in the face of the slide valve seat. The piston is exposed to brake cylinder pressure by suitable pipe connections from the triple valve. The normal position of the slide valve is closed. Any air that is vented to the brake cylinder is free to pass on top of the piston and around the slide valve. The tension of the regulating spring is 6o pounds on cars, and 50 pounds on the engine. When the brakes are applied in a service application the brake cylinder pressure forces the piston down, taking with it the slide valve and setting up connection with the atmosphere.

The tension of the spring allows the base of the triangular port to register with the oblong port in the face of the slide valve seat, and the excess pressure (or pressure over the tension of the regulating spring) is allowed to escape to the atmosphere. When the pressure is reduced below the tension of the spring, the piston is forced up bringing with it the slide valve, and the oblong port is blanked. The remaining pressure in the cylinder is retained until the brakes are released.

When the brakes are applied in emergency, the brake cylinder pressure forces the piston in the reduc-

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