. The Street railway journal . liary reservoir pressure (which acts against one side of thetriple-valve piston) is reduced very slightly below the pressurein the train line (which acts on the other side of the triple-valve piston), the valve which controls the flow of air from theauxiliary reservoir to the brake cylinder moves to the lap orclosed position. The application of brakes can therefore begraduated to any point desired. To make possible a graduated release, a connection is made 732 STREET RAILWAY JOURNAL. [Vol. XXV. No. i6. from the reservoir line to the triple valve, as indicated in
. The Street railway journal . liary reservoir pressure (which acts against one side of thetriple-valve piston) is reduced very slightly below the pressurein the train line (which acts on the other side of the triple-valve piston), the valve which controls the flow of air from theauxiliary reservoir to the brake cylinder moves to the lap orclosed position. The application of brakes can therefore begraduated to any point desired. To make possible a graduated release, a connection is made 732 STREET RAILWAY JOURNAL. [Vol. XXV. No. i6. from the reservoir line to the triple valve, as indicated in , and a triple valve is employed which differs from the ordi-nary triple valve. The cycle of operations for a hrake withgraduated release is as follows: With a motormans valve atrelease position there is a connection through the motormansvalve between the reservoir line and train line as in the otherbrake, and the train line, in turn, is open through the triplevalve to the auxiliary reservoir. There is also a passage open. FIG. 3. -NEW MOTOR CARS OF METROPOLITAN ELEVATED, SHOWING NO PLATFORMFEATURE AND AIR-COOLING COILS ON SIDE SILLS from the reservoir line by way of the graduated release con-nection, through the triple valve, to the auxiliary the brakes are to be applied in a service application, themotormans valve, as in the other brake, closes the connectionbetween the reservoir line and train line and allows the trainline pressure to escape gradually until the desired reduction isobtained. When the train line pressure is reduced below thatin the auxiliary reservoir, the triple-valve piston is moved tothe application position in the ordinary manner. The first move-ment of the triple valve closes the graduated release connectionso that no air can flow into the auxiliary reservoir from thatsource, closes the passage between the auxiliary reservoir andthe train line and opens a passage from the auxiliary reservoirto the brake cylinder. Thismovement of the tr
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
