. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . steam is therefore always pres-ent in these chambers A and E, at the left of small piston79, is always open to the exhaustpassage d through the ports t andt^, shown in the main valve bushing,Fig. 5, and diagrammatically in and 8. Exhaust steam, practicallyat atmospheric pressure, is thereforealways present in chamber E. A balancing port .«? runs diag-onally to the right in the reversing-valve cap nut and meets a groovedown the outside
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . steam is therefore always pres-ent in these chambers A and E, at the left of small piston79, is always open to the exhaustpassage d through the ports t andt^, shown in the main valve bushing,Fig. 5, and diagrammatically in and 8. Exhaust steam, practicallyat atmospheric pressure, is thereforealways present in chamber E. A balancing port .«? runs diag-onally to the right in the reversing-valve cap nut and meets a groovedown the outside of the reversingvalve bush, where it enters the upperend of the cylinder through a smallport in the head. The object of thisis to assure the same pressure aboveas below the reversing rod, whetherthere is live or exhaust steam in theupper end of the cyhnder, thus bal-ancing it so far as steam pressureis concerned. When the reversing slide valve72 is in its lower position, as shown in Figs. 5 and 7, chamberD is connected (through ports h, h^, re versing-valve exhaust-cavity H and ports / and f^) with main exhaust passage d, d\ d^^. Fig. 5. Section of Air Compressorthrough Reversing ValveCourtesy of Westinghouse Air Brake Com-pany, Wilmerding, Pennsylvania AIR BRAKES 17 and there is, therefore, only atmospheric pressure at the right ofpiston n. Therefore, as chamber E, at the left of piston 19, and chamberZ), at the right of piston 17, are both connected to the exhaust, MAIM VALVtBUSHING
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidairbrakesuptodat00ludy
