File:Railway and Locomotive Engineering (1904) (14576930268).jpg

Identifier: railwaylocomotiv26newyuoft (find matches)
Title: Railway and Locomotive Engineering
Year: 1904 (1900s)
Authors:
Subjects:
Publisher: New York
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

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e escapeof brake cylinder pressure and rechargeof the auxiliary from the emergency res-ervoir. Five or six of these graduationscan be readily made with a little practice,each one making a further drop in brakecylinder pressure, until it is tinally ex-hausted or until brake pijic pressure iswithin a few pounds of the maximumcarried. It will also be noted that ingraduated release position the servicereservoir charging valve is closed due toa lower auxiliary pressure under thevalve, and the feed groove from the brakepipe to the auxiliary and the port fromthe brake pipe to the emergency reservoirfor charging is also closed. When these graduations are continueduntil brake pipe pressure is almost re-stored or until the emergency reservoirhas recharged the auxiliary to within -Slbs. of that in the emergency reservoir,the service reservoir charging valve willbe forced open f provided that a releaseis desired) and the service reservoir is December, 1913. RAILWAY AND LOCOMOTIVE ENGINEERING. 443
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444 RAILWAY AND LOCOMOTIVE ENGINEERING. December, 1913. recharged from the release slide valvechamber, making a further reduction inemergency reservoir pressure, which willpermit the auxiliary pressure and thegraduated release piston spring to returnthis piston to its normal position, whenthe equalizing parts will move to releaseposition and recharge all reservoirs fromthe l)rake pipe, as already explained. In this manner brake cylinder pressurecan be retained or exhausted, partially orwholly at the will of the operator, theamount released being in proportion totliat admitted to the brake pipe, but dur-ing the transition period it may be ad-visable to cut out the graduated releasefeature until such time as the majority(if the cars in a train are equipped withuniversal or control valves; this is doneby turning the release piston cylindercover (graduated release cap) to directrelease position in which the graduatedrelease port is blanked, as shown in thediagrammatic view, and auxiliary

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