The E-T Air-Brake Pocket-Book will permit of 110 pounds as the maximum main-reser voir pressure. Automatic Service-Application Position. Figs. 10 A and 10 в represent a service application by the automatic brake-valve-say a 10-pound brakepipe reduction (refer to Fig. 10 A); this is primarily made by a 10-pound reduction of the equalizingreservoir pressure which is indicated by the black hand of the large duplex gauge, and this automatically causes an equal reduction of brake-pipe pressure through the equalizing-discharge valve of the brake-valve, the latter pressure being indicated by the black hand of the small duplex gauge. The broken colors on the piping diagram indicate these reduced pressure conditions, and also applies to pressures below the normal; the small pipe that carries full main-reservoir pressure to the excess-pressure governor top when the automatic brake-valve is in running position is cut out from that supply when the brake-valve is moved toward the application position -as now-and its pressure is minus; the low-pressure governor top is thus temporarily inactive, and the pump starts up to add to the 90-pounds excess pressure in the main reservoir until it reaches 110 pounds when the action of the high-pressure governor top will stop it at that figure. FIG. 10 B.-No. 6 Distributing Valve in Automatic Service-Application Position. Copyri ht, 1909, by The Norman W. Henley Puous... CALIFORNIA Fig. 10A PIPE FEED VALVE EXHAUST STEAM LIVE STEAM BRAKE VALVE BRAKE PIPE PIPE EQUALIZING MAIN BRAKE CYLINDER ROKEN COLORS INDICATE REDUCED, OR LOWER THAN NORMAL, PRESSURES. ram of No. 6 ET Equipment. Colors showing sequence of pressures, with the automatic braken service-application position; independent brake-valve in running position. |