. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . r piston66 is completed. On the downward strokeof the compressor, the effectjust described is reversed, theair below piston 66 being com-pressed and forced out throughports p and p^ past lower dis-charge valve 86d and throughchamber G and the air dischargepipe into the main reservoir. Atthe same time air is being drawnin from the atmosphere throughair inlet through chamber Fand port Z^ upper inlet valve86a and ports m and m^ intothe upper end of the air cylin
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . r piston66 is completed. On the downward strokeof the compressor, the effectjust described is reversed, theair below piston 66 being com-pressed and forced out throughports p and p^ past lower dis-charge valve 86d and throughchamber G and the air dischargepipe into the main reservoir. Atthe same time air is being drawnin from the atmosphere throughair inlet through chamber Fand port Z^ upper inlet valve86a and ports m and m^ intothe upper end of the air cylinderabove the air piston 66. Two=Stage Type. TheWestinghouse two-stage air com-pressor, known as the SJ-inchcross-compound compressor, iscontrolled or operated by a valve gear quite similar to that used inthe single-stage type. The following description covers in a generalway the chief differences in the operation of the two types of com-pressors: Comparison with Single-Stage Type, The cross-compoundpump is coming into use as a result of the growing demand for moreair on long freight trains. Its capacity is about three and one-half. Fig. 9. 8 J^-Inch Cross-Compound Com-pressor, Showing Air-Inlet SideCourtesy of Westinghouse Air Brake Company,Wilmerding, Pennsylvania AIR BRAKES 21 times that of the 9^-incli pump shown in Fig. 4. As illustrated inFigs. 9 and 10, this pump is of the duplex type, having two steam
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