. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . and chamber C, asalready explained, still further insures a quick and positive move-ment of the apphcation piston and its valves to emergency position. 162 AIR BRAKES In this position the pressure chamber is connected through theequaHzing sHde valve to chamber D, The pressure chamber is alsoconnected past the pressure-chamber check valve to chamber E,and chamber D is connected past the end of the equalizing graduat-ing valve through the equalizing slide valve
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . and chamber C, asalready explained, still further insures a quick and positive move-ment of the apphcation piston and its valves to emergency position. 162 AIR BRAKES In this position the pressure chamber is connected through theequaHzing sHde valve to chamber D, The pressure chamber is alsoconnected past the pressure-chamber check valve to chamber E,and chamber D is connected past the end of the equalizing graduat-ing valve through the equalizing slide valve to the reduction-limitingchamber. (b) Quick=Action Valve Closed. The emergency brake-cylin-der pressure and the pressure in chamber T above the quick-actionclosing valve continue to rise and the pressure in the emergencyreservoir and in chamber W below the quick-action closing valvefalls, as explained above, until these pressures become substantially Fie lease O^od PistonRelease Equalizing Qrad Valve Release. 5lide Valve Equallzng 5lide Valve EqualizingPi5ton Stop Pressure Chamber Chech Volve. ■056 Pi 5ton / Equalizinq Slop3prinq \ DrahePipe Direct &.anodFe}.Cqp / / \ \\ , EmerPiston ^ 5/^rCi^l. \EmerQ^l> Emer^lideVolve^^ EmerCif/Ex CmerHes. nch PIction Valve Fig. 131. Emcrsency Position, Quick-Action Valve Closed, for Westinghouse 3-E Control Valve equal. This equalization of the pressures on the opposite sides ofthe quick-action closing valve permits its spring to return the valveto its seat, cutting off further flow of air to chamber W. ChamberW is connected through the leakage hole in the quick-action pistonto chamber X so that as soon as the quick-action closing valve isseated, the pressure in chamber W expands through this leakage holeto chamber X and the atmosphere through the quick-action exhaustopening. The balancing of the pressures in chambers X and Wthus permits the quick-action valve spring to return the quick-action valve to its seat, cl
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