Identifier: cyclopediaofloco00swin (find matches)
Title: Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives
Year: 1916 (1910s)
Authors: Swingle, Calvin Franklin, 1846- (from old catalog)
Subjects: Locomotives
Publisher: Chicago, F. J. Drake & co., pub. for Sears, Roebuck & co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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er. Wheneither pressure varies, the piston will move toward thelower. Consequently if that in chamber b is reduced, bybrake-cylinder leakage, the pressure maintained in the ap-plication chamber will force piston 10 to the right, open-ing application valve 5 and again admitting main reservoirair to the brake cylinders until the pressures on bothsides of piston 10 are again equal, when the graduatingspring will force the piston back to lap position. In thisway the brake-cylinder pressure is always maintained tothat in the application chamber. This is called the pres-sure maintaining feature. Independent Release. When the handle of the in-dependent brake is moved to release position, a directopening is made through the rotary valve from the ap-plication chamber to the atmosphere. This permits thepressure in the application chamber to escape; therefore,as this pressure is being exhausted, brake-cylinder pres-sure in chamber b moves application piston 10 to the left, ET BRAKE EQUIPMENT 681
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\s/////////Z>////////////////777% FIG. 301. INDEPENDENT LAP 682 LOCOMOTIVE ENGINEERING causing exhaust valve 16 to open exhaust ports e and das shown in Fig. 299, thereby allowing brake-cylinderpressure to escape to the atmosphere. If the independent brake valve is returned to lap be-fore all of the application-chamber pressure has escaped,the application piston 10 will return to independent lapposition as soon as the brake-cylinder pressure is reduceda little below that remaining in the application chamber. AUTOMATIC OPERATION. During automatic operation of the brakes, the lowermovable parts, known as the equalizing parts, are broughtinto action. Automatic Release. Referring to Fig. 299, whichshows the movable parts of the valve in the release posi-tion, it will be seen that as chamber p is connected tothe brake pipe, brake-pipe air flows through the feedgroove around the top of piston 26 into the chamberabove the slide valve 31, and through port 0 to the pres-sure chamber, until

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