. The science of railways . C^i^ CAa/nSer ders being placed one directly above the otherand as close together as they can be with ade-quate walls between them. Figs. 113 and 114show the proximity of the two cylinders, whilein Fig. 115, which shows the arrangement of thecylinders in relation to the valve, the actual con-struction is distorted for illustrative purposes. The valve used to distribute the steam to thecylinders is of the piston type, working in a cyl-indrical steam chest located in the saddle of 188 ENGINEERS AND FIREMENS MANUAL. the cylinder casting as close to the cylinders asposs
. The science of railways . C^i^ CAa/nSer ders being placed one directly above the otherand as close together as they can be with ade-quate walls between them. Figs. 113 and 114show the proximity of the two cylinders, whilein Fig. 115, which shows the arrangement of thecylinders in relation to the valve, the actual con-struction is distorted for illustrative purposes. The valve used to distribute the steam to thecylinders is of the piston type, working in a cyl-indrical steam chest located in the saddle of 188 ENGINEERS AND FIREMENS MANUAL. the cylinder casting as close to the cylinders aspossible and between them and the smoke-box,as shown in the figures. This chest, havingsteam passages cast larger than required, isbored out enough larger than the diameter ofthe piston valve to permit the use of a hard castiron bushing. Fig. 122 shows this bushing andone method of forcing it into place so that steamtight joints will be had between all ports; it. l^/i/i C/iamSer also shows the narrow bridges across the steamports which prevent the eight packing rings ofthe valve (shown in Fig. 116) from entering theports. These cast iron packing rings form theedges of the valve. The valve is of the piston type—double, andhollow between the two inside pistons—but hav-ing two solid ends, as shown by Fig. 116, andcontrols the admission and exhaust of both cylin-ders. The exhaust steam from the high-pressure OPERATION OF COMPOUND LOCOMOTIVES, 189 cylinder becomes the supply steam for the low-pressm-e cylinder and is transmitted from oneside of the^igh-pressure cylinder to the opposite
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1900
