Forney's catechism of the locomotive Volume 1

9781236137463: Forney's catechism of the locomotive Volume 1

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ...opened by the packing, D. At the same time the port at the lefthand end of the low-pressure cylinder, is open and the steam is escaping into the steam-chest at the ends of the valve, from which it escapes to the atmosphere. During the period of exhaust, covering the movement of the pistons from the time that the high-pressure exhaust opens until the valve opens to admit steam to the low-pressure cylinder, the high-pressure exhaust flows into the receiver space, E, of the valve, filling it and at the same time expanding behind the high-pressure piston. Where the high-pressure cylinder is set ahead of the low, the steam chests are set up on a line above and between the two, as in Fig. 294. Two valves are used as shown in Fig. 295. They are driven by the same stem and are in line with each other. The high-pressure valve, A, is of the inside admission type, steam entering the steam chest at B, from the boiler. The high-pressure exhaust escapes into the spaces D and F at the ends of the valve. Both valves are hollow, so that there is space for the flow from F at the front end of the high-pressure valve to E at the back end of the low-pressure valve, the whole acting as a receiver between the cylinders. The low-pressure valve has an outside admission and its exhaust escapes into the space G, from which it flows to the exhaust pipe and the atmosphere. Question 365. How do the exhausts occur in the four-cylinder compound locomotives? Answer. There are four for each revolution of the driving wheels, as in a simple locomotive. Question 366. What arc some of the advantages of the four-cylinder compound locomotive? Answer. It makes it possible to obtain an approximately perfect balance of the reciprocating parts of the engine; the revolving parts can be perfectly balan...

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