. American engineer and railroad journal . ect coujiled generators may beHrmly secured. The piston speed is kept uniform in all sizes of engines,being ( ft. per minute, tlie rotative speed varying from80 revolutions on a2,000 triple to 240 revolutions perminute ou a compound, thus allowing the engineto be connected direct to generators. The cylinders are of the four-valve type, having two portsfor steam and two ports for , with a steam-chest on oneside and an exhaust-chest diametrically opposite on theother side, standing at right angles with the crank-shaft,and allow
. American engineer and railroad journal . ect coujiled generators may beHrmly secured. The piston speed is kept uniform in all sizes of engines,being ( ft. per minute, tlie rotative speed varying from80 revolutions on a2,000 triple to 240 revolutions perminute ou a compound, thus allowing the engineto be connected direct to generators. The cylinders are of the four-valve type, having two portsfor steam and two ports for , with a steam-chest on oneside and an exhaust-chest diametrically opposite on theother side, standing at right angles with the crank-shaft,and allowing perfect freedom of access. The clearances arefrom 2^ to 7 or 8 per cent., according to the diameter of thepiston, being least on the greater diameters, and moditiedsomewhat by the pressures of steam, higher pressures re-quiring larger port areas and larger clearances. The cylinders are substantially and neatly lagged withiron, and the intervening spaces between the cylinders and lasaiug filled with uon-conductinfj material. The stcam-. SU chest covers are provided with hoods, paneled and polishedon the exterior surface. The valves are small, light andfour ported, the high-pressure steam valve being perfectlybalanced and the others working under light pressures outheir seats. The steam and exhaust valves are worked byindependent gear and the lap is adjustable, permitting ofthe most advantageous setting for either conde^ng or non-condensing service. The governor and steam valves areconstructed to carry the steam as far as seven-eighths strokein the first cylinders should the demands of the load at anytime require it, permitting the engine to exert not less than30 per cent, more power than any engine with releasingvalve gear of same diameter of cylinders and piston feature specially qualifies the engine fur railroad andother work requiring high powers through short periods oftime. In most marine engines using piston valves in the high-pressure cyli
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
