. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . in the upper steam cylinder compressor is of the double-actingdirect-connected type, steam being admittedalternately to the under and to the upperside of the steam piston, causing it to moveup and down. As the air piston is directlycoupled to the steam piston by the pistonrod, it moves up and down with the steampiston. On the upward stroke of the air pis-ton, the air above it is compressed and dis-charged into the main reservoir while thespace below
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . in the upper steam cylinder compressor is of the double-actingdirect-connected type, steam being admittedalternately to the under and to the upperside of the steam piston, causing it to moveup and down. As the air piston is directlycoupled to the steam piston by the pistonrod, it moves up and down with the steampiston. On the upward stroke of the air pis-ton, the air above it is compressed and dis-charged into the main reservoir while thespace below it is being filled with air drawnfrom the atmosphere. On the down strokeFig. 4. 9Hlchs7eam-Driven this Operation is rcvcrscd. The exhaust steamrn. f ^%^^^;l ,. is usually piped to the smokestack. Courtesy of Westinghouse Air v/ jr x- ^^gpeZ^v^n^ ^^^^^ ^hc comprcssor is built in differ- ent sizes. Table I gives the principal dimen-sions, actual air delivery, and weight of the single-stage of the sizes of single-stage air compressors now being builtoperate on the same principle. Fig. 4 illustrates the general appear-. AIR BRAKES 15 TABLE I General Dimensions, Capacity, and Weight of Westinghoiise StandardSteam=Driveqi Air Compressors Diameter of Steam Cylinder 8 in. 9| in. 11 in. Diameter of Air Cylinder 8 in. 9^ in. 11 in. Stroke 10 in. 10 in. 12 in. Steam Admission Pipe 1 in. 1 in. 1 in. Steam Exhaust Pipe Uin. U in. 1| in. Air Admission Pipe H in. Ih in. U in. Air Delivery Pipe li in. 11 in. U in. Nominal Speed, single strokes per minute 12Q 120 100 Actual capacity in cu. ft. of free air })er min. actually delivered when operating continuously, at above speed, against 100 pounds pressure 20 cu. ft. 28 cu. ft. 45 cu. ft. Over-all Dimensions: Height 421 in. 42i in. 5U in. (Approximate) Width 18 in. 18i in. 22 in. Depth 13f in. 14i in. 16 in. Average Net Weight 450 lb. 525 lb. 850 lb. ance of the 9J-inch size. Views of the compressor, with steam andair cyUnders an
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidairbrakesuptodat00ludy
