. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . Fig. 146. Westinghouse Type J Electric Compressor Governorin Cut-in Position—Cover Removed AIR BRAKES 187 hand side of the larger end of the double piston is now much higherthan that in chamber C, the pistons and attached slide valve aremoved to the left to cut-out position, as sho^\^l in detail at theright, Fig. 147. It will be seen that the first movement of the slide. Fig. 147. Diagrammatic Sectional View of Westinghouse TypeElectric Compressor in Cut-in P
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . Fig. 146. Westinghouse Type J Electric Compressor Governorin Cut-in Position—Cover Removed AIR BRAKES 187 hand side of the larger end of the double piston is now much higherthan that in chamber C, the pistons and attached slide valve aremoved to the left to cut-out position, as sho^\^l in detail at theright, Fig. 147. It will be seen that the first movement of the slide. Fig. 147. Diagrammatic Sectional View of Westinghouse TypeElectric Compressor in Cut-in Position J valve 76 opens port b to chamber B, permitting air at main-reservoirpressure to flow through port b to the piston seal 21, The areaof port b, however, is so small that tlie main-reservoir pressureacting therein is not able to overcome the pressure of spring 17,which holds the switch piston to its seat. But a further travel of 188 AIR BRAKES the slide valve opens port g, which allows air at main-reservoirpressure to flow to the air cylinder W, thus breaking the sealof the piston and the main-reservoir pressure then acts on the entirearea of the piston, causing it to move outward very rapidly and breakthe circuit. By having port b open before port g, a free flow ofhigh-pressure air to the space W below the switch piston is insuredand a quick-break obtained, which eliminates any tendency tocut out slowly. During this movement the air above the switchpiston is compressed, and forced through
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidairbrakesuptodat00ludy
