Locomotive Compounding and Superheating; A Practical Text-Book for the Use of Railway and Locomotive Engineers, Students, and Draughtsmen (Paperback)

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. 1907 Excerpt: ...against its seating, so as to close the passage c connecting with the high-pressure cylinder. As soon as there is exhaust Fig. 72.--Starting and Intercepting Valves--Brooks Locomotive Works--Player System. from the high-pressure cylinder the intercepting valve b is forced to the right, thereby closing the valve a, and the engine works compound. The Rogers Automatic System.--This system, introduced by the Rogers Locomotive Works (U.S.A.), has now been superseded by a non-automatic system, but the old system is of sufficient importance for inclusion in this chapter. The combined starting and reducing valve (fig. 73) is located at a, and comprises a valve a1 and a piston a2 mounted on a stem, live steam being admitted for starting to the space between them, and the lower side of the large valve being exposed to any pressure within a pipe b leading to the intercepting apparatus. When there is no pressure in the pipe b the live steam pressure admitted between the valve a1 and the piston a2 opens the valve a1 so that the steam can pass to the pipe b, but as soon as there is sufficient pressure in the pipe b the valve a1 is lifted on to its seating and the live steam supply is cut off. The combined valves a1 a2 serve the purpose of a reducing valve. The presence of the reduced pressure boiler steam in the pipe b causes the closing of the intercepting valve c, the steam first passing through the small passage d to the back of a plunger d1, which is operated to move a hollow piston valve e to the right, closing the valve c, and thereby cutting off communication between the high-and low-pressure cylinders; at the same time the movement of the piston e places the ports / and g in communication, so that steam from the Fig. 73.--Rogers Locomotive Works (Automatic) Syste...