. Railway mechanical engineer . valve is open when theengine leaves the roundhouse and closed when the engine reachesthe cinder pit. Through ports in the inner well of chamber Asteam is admitted to the annular space B surrounding the hol-low stem of the piston valve G. So long as there is pressurein the cylinder and steam chest the piston valve remains seatedin the position shown in the drawing. When the throttle isclosed and the engine is drifting, as soon as a vacuum formsatmospheric pressure acting upward against piston valve throughthe ports H in the casing raises the piston i in. which is
. Railway mechanical engineer . valve is open when theengine leaves the roundhouse and closed when the engine reachesthe cinder pit. Through ports in the inner well of chamber Asteam is admitted to the annular space B surrounding the hol-low stem of the piston valve G. So long as there is pressurein the cylinder and steam chest the piston valve remains seatedin the position shown in the drawing. When the throttle isclosed and the engine is drifting, as soon as a vacuum formsatmospheric pressure acting upward against piston valve throughthe ports H in the casing raises the piston i in. which is thelimit of its travel. This movement places the annular space Bin communication with ports C through which steam from 593 594 RAILWAY AGE GAZETTE, MECHAXICAL EDITION Vol. 89, No. 11 chamlier .1 passes into cliaml)er / and thence tliroiiph ports Eto the hollow stem of the piston. The check valve F is raisedfrom its seat and steam passes directly into the steam soon as the engine stops or for any reason a slight pres-. Drifting Val Section Z-ZSuperheater Locomotives sure is formed in the cylinder the piston valve is forced down-ward to its seat, thus cutting off communication between theannular space around the hollow stem and chamber D. Thisvalve has been found to greatly assist in the proper lubrication■of cylinders where superheated steam is used. CONDENSER VACUUM PUMP The modern power house equipment invariably includes a con-denser plant, the efficiency of which depends upon the degreeof vaciuim within the condensing apparatus. For maintainingthis vacuum and for general service in other lines where a highdegree of vacuum is desired, the Ingersoll-Rand Company, 11Broadway, New York, has recently introduced a complete lineof steam and power-driven, duplex type vacuum pumps. In general the design of these machines follows that of the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
