. American engineer and railroad journal . ve works only when the engine is runningsimple, and throttles the steam passing through it, so that thepressure of steam going to the low-pressure cylinder is about one-half the steam pressure in the dry pipe. The intercepting and reducing valves are worked automaticallyby the steam pressures acting on the difference of areas of the endsof the valves, and their movement is cushioned by dash pots. Theseparate exhaust valve is operated by the engineer, by means of athree-way cock in the cab. To open the separate exhaust valve,the handle of the three-wav
. American engineer and railroad journal . ve works only when the engine is runningsimple, and throttles the steam passing through it, so that thepressure of steam going to the low-pressure cylinder is about one-half the steam pressure in the dry pipe. The intercepting and reducing valves are worked automaticallyby the steam pressures acting on the difference of areas of the endsof the valves, and their movement is cushioned by dash pots. Theseparate exhaust valve is operated by the engineer, by means of athree-way cock in the cab. To open the separate exhaust valve,the handle of the three-wav cock is thrown so as to admit air orsteam pressure against the piston J. Pulling the handle back re-lieves the pressure against J and the spring, which is shown inthe figures, shuts the valve. All the engineer ever has to do inconnection with the operation of the valves is to pull the handleof a three-way cock in the cab, one way or the oiher, according SHRUNK OH I_l 1 1 1 ( i « * , t--«=-L I * vl—2<-^ -4--U COd h • 1 I G--L 0 O. Fi. 1.—Low Pressure Cylinder of Compound Mastodon Locomotive. AND RAILROAD JOURNAL. 126
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
