The science of railways . gvalve and low-pressure cylinder when it is de-sired to work the engine non-compound

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The science of railways . gvalve and low-pressure cylinder when it is de-sired to work the engine non-compound

The science of railways . gvalve and low-pressure cylinder when it is de-sired to work the engine non-compound. With the valve mechanism which will beshown and described in what follows, w^hen thereverse lever is either in full forward or back-upgear and the throttle opened, the engine startsby the admission of live steam into both cylin-ders and with an open exhaust passage from eachcylinder to the stack. The live steam admittedto the low-pressure cylinder is sufficiently re-duced in pressure by passing through a reducingvalve to cause the engine to have the same powerthat a simple locomoti . The science of railways . gvalve and low-pressure cylinder when it is de-sired to work the engine non-compound. With the valve mechanism which will beshown and described in what follows, w^hen thereverse lever is either in full forward or back-upgear and the throttle opened, the engine startsby the admission of live steam into both cylin-ders and with an open exhaust passage from eachcylinder to the stack. The live steam admittedto the low-pressure cylinder is sufficiently re-duced in pressure by passing through a reducingvalve to cause the engine to have the same powerthat a simple locomotive would have with twocylinders the size of the high-pressure cylinder.When the reverse lever is hooked-up, or drawntoward the center, one or more notches, it me-chanically works an operating valve and pistonnear the cab, which throws the interceptingvalve into ]30sition for compound working.There is a hand lever in the cab, as shown inFig. 148, which can be used to move the inter- 238 OPERATIOX OF COMPOUND LOCOMOTIVES. 233. 240 ENGINEERS AND FIliEMENS MANUAL. cepting valve in case of derangement of the op-erating device, or other necessity. However,the engine will only start simple when the in-tercepting valve is placed in proj)er position, asthis valve does not automatically assume simpleposition of its own volition. Fig. 148 gives the

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