. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . Fig. 20. Horizontal Section of Westinghouse Brake Valve, ShowingRunning Position feed valve into the brake i)ipe, keeping the train charged, whichis the normal condition of the brake system while a train is runningover the road and the brakes are not being used. Application Position. To apply the brakes in service, thebrake-valve handle is moved to service-application position, which 36 AIR BRAKES will permit of a brake-pipe reduction. This cuts off all air s
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . Fig. 20. Horizontal Section of Westinghouse Brake Valve, ShowingRunning Position feed valve into the brake i)ipe, keeping the train charged, whichis the normal condition of the brake system while a train is runningover the road and the brakes are not being used. Application Position. To apply the brakes in service, thebrake-valve handle is moved to service-application position, which 36 AIR BRAKES will permit of a brake-pipe reduction. This cuts off all air supplyto the brake pipe and equalizing reservoir, as shown in Fig. 21,and opens the small port e called the preliminary exhaust port,leading to chamber J) and the equalizing reservoir. This permitsair to escape from above the equalizing piston through port e in To Underside of Diaphragmof Excess Pressure fieadof Duplex Fump Governor ngmeer sBrake Valve. Fig. 21. Horizontal Section of Westinghouse Brake Valve, Showing Service Position the rotary valve seat, cavity y in the rotary valve, and the directappHcation and exhaust port h to the atmosphere. This reducesthe pressure of the air on top of the equalizing piston below thepressure of the air in the brake pipe under the piston. This con-dition causes the piston to lift, carrying the equalizing-dischargevalve from its seat and allowing air from the brake pipe to escape AIR BRAKES 37 throiio^li the opening vi past the valve and thence through passage nand service exhaust fitting into the atmosphere. Without the equahzing reservoir the pressure in chamber J)would drop almost instantly to zero, and consequently it would benearly impossible to make a moderate brake-pipe reduction. With an To Underside cfDiaphragmof Efcess Pressure Headcf Doplei Pump Gather nor f^nt^tneersBrake Valine To/ftmosphere ToBlackfiandofDuplex /fir Gage
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidairbrakesuptodat00ludy
