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To simplify the tracing of the ports and connections, the various positions of this valve are illustrated in nine diagrammatic views; that is, the valve is distorted

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Fig. 7.—No. 6 Distributing Valve. Connections: MR-main-reser

voir pipe; IV-distributing-valve release pipe; II-applicationcylinder pipe; CYLS-brake-cylinder pipe; BP-brake pipe.

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to show the parts differently than actually constructed with the object of explaining the operation clearly, instead of showing exactly how they are designed. The chambers of the reservoir are for convenience indicated at the bottom as a portion of the valve itself. In Fig. 7, equalizing piston 26, graduating valve 28, and equalizing slide valve 31 are shown as actually constructed; but as there are ports in the valve that can not be indicated at once in sectional side elevation just as they exist (see Fig. 8-face of slide valve, and plan of seat), the diagrammatic illustrations show each slide valve considerably elongated so as to make all the ports appear in one plane, with similar treatment of the equalizing-valve seat. Fig. 8 shows the correct location of these ports.

Referring to Fig. 7, the port through application valve 5 is of greater area than appears in sectional side view, as it extends transversely to nearly the width of the valve, and in full application position is in register with a port exactly corresponding in plan and area in the seat; from the center of the latter port a narrow, longitudinal opening is cut through the valve seat, but always covered by the valve, for the traverse of application-valve pin 18.

A piping diagram accompanies each chart in the following series that represents the distributing valve in the different operating positions, showing the contained

The E-T Air-Brake Pocket-Book

pressures as they are affected, primarily, by the operation of the engineer's brake-valves, and secondarily, by the action of the distributing valve; the only omissions of the piping diagram being where it would merely be a repetition, as in connection with the charts showing the distributing valve when it has automatically returned to lap position after an application, etc. A COLOR KEY is supplied for reference on each color-plate page.



Running Position.

Figures 9 A and 9 B: Fig. 9 A shows the No. 6 E-T EQUIPMENT as a whole, with the automatic and independent brake-valves in running positions, and pipes and reservoirs charged with pressures as indicated by their colors; Fig. 9 B is a diagrammatic chart of the distributing valve with the operating parts in release and charging position, as the result of maintenance of brake-pipe pressure and the absence of pressure in the application cylinder.

Referring to Fig. 9 A: The boiler-pressure steam (dark blue) enters the steam cylinder of the air pump, enforcing action of the steam piston and the connected air piston in the air cylinder, and is exhausted through the pipe (light blue), that leads to the smoke box, or main exhaust passages of the locomotive cylinders. Atmospheric air (orange) is drawn in through the strainer to the air cylinder, in which it is condensed to main-reservoir pressure (red), and passes through both main reservoirs directly to the automatic brake-valve, the feed valve, the reducing valve, the high-pressure governor top, the large duplex gauge where it is indicated by the red hand, the by-pass strainer-and-check

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