The well-known principle embodied in the Westinghouse quick-action triple valve, by which it gives a high brake power in emergency applications, and a sufficiently lower one, in full-service applications, to provide a desired protection against wheel sliding, is embodied in the No. 6 distributing valve, but without the violent shock to the brake rigging from cylinder piston to brake shoes that occurs at an emergency application of the quick-action triple valve, and the venting of brake-pipe air is not included as an emergency feature unless specially demanded as an adjunct to the standard equipment; the emergency increase of application-cylinder pressure is accomplished by cutting off the application chamber from it, when the pressure chamber will equalize with the quite small application cylinder at a greatly increased pressure that will be followed by a correspondingly high brake-cylinder pressure. Names of Operating Parts NAMES OF THE OPERATING PARTS, NO. 6 DISTRIBUTING VALVE. All of the operating parts are plainly shown in Fig. 7; and the faces and seats, and plan views of the equalizing slide valve and its graduating valve, are shown in Fig. 8. In connection with a study of Figs. 2A, 2B, and Fig. 6, the piping connections of Fig. 7 and the connecting ports between the reservoir section and the valve section will be readily understood. The SAFETY VALVE is an essential part of the distributing valve that will be described in detail further along. Referring to Figs. 6 and 7, the names of parts of this apparatus are as follows: 2, Body. 3, Application-Valve Cover. 4, Cover Screw. 5, Application Valve. 6, Application-Valve Spring. 7, Application-Cylinder Cover. 8, Cylinder-Cover Bolt and Nut. 9, Cylinder-Cover Gasket. 10, Application Piston. 11, Piston Follower. 12, Packing-Leather Expander. 13, Packing Leather. 14, Application-Piston Nut. 15, Application-Piston PackingRing. 16, Exhaust Valve. 17, Exhaust-Valve Spring. 18, Application-Valve Pin. 19, Application-Piston Graduating Stem. 20, Application-Piston Graduating Spring. 21, Graduating-Stem Nut. 22, Upper-Cap Nut. 23, Equalizing-Cylinder Cap. 24, Cylinder-Cap Bolt and Nut. 25, Cylinder-Cap Gasket. 27, Equalizing-Piston Packing-Ring. 29, Graduating-Valve Spring. 31, Equalizing Valve. 32, Equalizing-Valve Spring. 33, Lower-Cap Nut. 34, Safety Valve. 35, Double-Chamber Reservoir. 36, Reservoir Stud and Nut. 37, Reservoir Drain-Plug. 38, Distributing-Valve Drain-Cock. 39, Application-Valve-Cover Gasket. 40, Application-Piston Cotter. 41, Distributing-Valve Gasket (not shown). 42, Oil Plug. 43, Safety-Valve Air Strainer. Graduating Sleeve (numbered 60 on all subsequent plates). 45, Equalizing-Piston Graduating Graduating 46, Equalizing-Piston Spring. 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 Copyright, 1909, by The Norman W. Henley Publishing Co. FIG. 7.-No. 6 Distributing Valve. Connections: MR-main-reservoir pipe; IV-distributing-valve release pipe; II-applicationcylinder pipe; CYLS-brake-cylinder pipe; BP-brake pipe. Equalizing and Application Valves 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 |