. Railway mechanical engineer . past ten steam valve gear side of the machine is illustrated in Fig. 1 which shows the single high duty steam cylinderplaced in the rear of and in tandem with the low pressureair cylinder, the high pressure air cylinder being in a verticalplane. A heavy fly wheel, better shown in Fig. 2, is mountedon one end of the crank shaft so as to impart a smoothand even motion to the machine. A single crank pin drivesboth low pressure and high pressure pistons. All movingparts of the compressor proper are provided with positiveautomatic lubrication. The low press
. Railway mechanical engineer . past ten steam valve gear side of the machine is illustrated in Fig. 1 which shows the single high duty steam cylinderplaced in the rear of and in tandem with the low pressureair cylinder, the high pressure air cylinder being in a verticalplane. A heavy fly wheel, better shown in Fig. 2, is mountedon one end of the crank shaft so as to impart a smoothand even motion to the machine. A single crank pin drivesboth low pressure and high pressure pistons. All movingparts of the compressor proper are provided with positiveautomatic lubrication. The low pressure cylinder is directly attached to themain horizontal frame, the other cylinders being supportedand firmly bolted in correct alinement with the main frame. June, 1922 RAILWAY MECHANICAL ENGINEER 349 The main bearings are made in four parts of cast-iron linedwith babbitt and arranged for ready adjustment and removalwithout taking out the main shaft. The steam cylinder isof the Sullivan high duty type. The cylinder casting con-. Fig. 1—view Showing Steam Valve Gear Side of Sullivan Air Compressor tains the exhaust ports, placed near the hottcra of the bore,and at some distance from the cylinder ends. The cylinderheads contain the steam ports into which the steam valve 1 ■ ■n ■ IT. 1 4^ Mm i*! ^^ ^ E ^^i^^AsLJ^^ >■ 1 1 |H|^HH^H^^^^,H3^— Zm are placed at the bottom of the heads and extend belowthe bore of the cylinder to permit any condensation entrappedafter the valves have closed, to escajje into the steam cylinder is lined with 85 per cent magnesia andsheet steel. The steam and exhaust valves are of the Sullivan wafertype, consisting of flat rings of thin temjjered alloy of the steam valves is supported by a fore-arm spiderand a removable seat. In operation, the steam valves areraised from their seats by cams and rollers acting on theouter end of the valve stem. The steam is admitted aroundthe outer edge of the valve and through its
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
