. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . Fig. 39. Plain Triple Valve forAir Brake Equipment Courtesy of Westingkouse AirBrake Company, Wilmer-ding, Pennsylvania. Fig. 40. Section through Westinghouse PlainTriple Valve In the case of the triple valve, the variations in pressure neces-sary to cause it to operate are due to the increase or decrease inbrake-pipe pressure caused by movements of the engineers brakevalve, burst hose, opening of conductors valve, etc., on one sideof the triple-valve piston,
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . Fig. 39. Plain Triple Valve forAir Brake Equipment Courtesy of Westingkouse AirBrake Company, Wilmer-ding, Pennsylvania. Fig. 40. Section through Westinghouse PlainTriple Valve In the case of the triple valve, the variations in pressure neces-sary to cause it to operate are due to the increase or decrease inbrake-pipe pressure caused by movements of the engineers brakevalve, burst hose, opening of conductors valve, etc., on one sideof the triple-valve piston, or on the other side of the piston by adecrease in the auxiliary-reservoir pressure caused by a flow of airinto the brake cylinder from the auxiliary reservoir. As previously stated, the triple valve forms one of the mostimportant parts of the air-brake equipment. The different West- AIR BRAKES 53
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