Locomotive text for engineers and firemen; a complete treatise on the engine, electric headlight and standard code of train rules - Softcover
Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...completed its full stroke, thereby allowing the expansive force of the steam to exert its energy upon the piston from the time the cut-off takes place up to a point where the steam is released. The distance the valve travels during the expansion of the steam equals the total of the outside and inside laos of the valve. EXHAUST CLEARANCE. The exhaust clearance is the space between the inside edge of the exhaust arch and the outside edge of the exhaust bridges when the valve stands centrally on its seat, indicated by the space between lines O and P (Fig. 50 COMPRESSION. Steam pressure which does not pass out of the cylinder during the time the exhaust port is open is entrapped in the cylinder, shown in Fig. 62, and indicated by the arrows. When the valve is in this position the inside edge of the valve closes the back steam port to the exhaust. The exhaust steam which is entrapped in the back end of the cylinder is compressed by the piston on its return stroke. This is called the point of compression. It will be seen that both steam ports are now covered by the valve shown in Fig. 62. The compression will continue to increase until the piston has completed its stroke. With cylinders which are not equipped with relief valyes, when the compression becomes greater in the cylinder than the pressure in the steam-chest, it will force the valve off its seat and relieve the cylinder of its excessive pressure. PREVENTING BREAKDOWNS AND ACCIDENTS. Breakdowns and accidents are prevented by a thorough and careful inspection of the engine before leaving the roundhouse; also by making a thorough inspection each time when oiling. Anengineman should set up the wedges or see that they are properly set up by the roundhouse man, key up all rod brasses, see...
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