. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . EqualizingReservoir Brake Pipe 1 Fig. 22. Horizontal Section of Westinghousc Brake Valve, Showing Lap Position equalizing reservoir of sufficient capacity, it takes (3 to 7 secondsto make a reduction of 20 pounds, which is slow enough to permitof the reduction to be stopped at any desired point as indicated bythe air gage by moving the brake-valve handle to /ap the equalizing-discharge valve lifts, the discharge ofair from the brake pipe is rapi
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . EqualizingReservoir Brake Pipe 1 Fig. 22. Horizontal Section of Westinghousc Brake Valve, Showing Lap Position equalizing reservoir of sufficient capacity, it takes (3 to 7 secondsto make a reduction of 20 pounds, which is slow enough to permitof the reduction to be stopped at any desired point as indicated bythe air gage by moving the brake-valve handle to /ap the equalizing-discharge valve lifts, the discharge ofair from the brake pipe is rapid, decreasing in amount slowly as 38 AIR BRAKES the pressure in the brake pipe approaches the pressure in chamberD, and the equahzing piston causes the equaUzing-discharge valveto close, stopping further discharge of air from the brake gradual stopping of the brake-pipe discharge prevents theair from surging in the brake pipe, a condition which tends to cause vzr. To Underside cf Diaphragmof Excess Pressure Meadcf Duplex Pump Go^erncr. ^—Brake Pipe Fig. 23. Horizontal Section of Westinghouse Brake Valve,Showing Release Position an undesired movement of the triple-valve pistons, which mightcause some of the head brakes to release. The length of time that the air will continue to discharge fromthe brake pipe after the brake-valve handle has been placed inZap position depends upon whether the train is a long or short a short train, the brake-pipe volume is small and will not AIR BRAKES 39 take as long to discharge as in the ease of a long train where thebrake-pipe volume is great. It can be readily seen that the equal-izing reservoir, together with the equalizing piston, is nothingmore than an automatic means of measuring the amount of air tobe discharged from the brake pipe and to govern the rate of flowto the atmosphere. Lap Position. Lap position of the brake valve, as illustratedin Fig. 22, prevents the movement of air to or frrm any ])art ofthe brake equi
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidairbrakesuptodat00ludy
