. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . elease slide valve to the position 144 AIR BRAKES shown in Fig. 119, called preliminary service position. In this positionthe piston has closed the feed groove i (which is therefore not shownin Fig. 119) and just touches the release graduating-piston function of the valve in this position is to close the portleading from the application chamber to the atmosphere (which istherefore not shown in Fig. 119), to close the port connecting cham-ber F to t
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . elease slide valve to the position 144 AIR BRAKES shown in Fig. 119, called preliminary service position. In this positionthe piston has closed the feed groove i (which is therefore not shownin Fig. 119) and just touches the release graduating-piston function of the valve in this position is to close the portleading from the application chamber to the atmosphere (which istherefore not shown in Fig. 119), to close the port connecting cham-ber F to the emergency-piston exhaust, and to open this latter port,connecting chamber E past the end of the release graduating valveand through the release slide valve to chamber F. Pressure-cham-ber air is, therefore, free to flow past the pressure-chamber check Equalizing^GradualingSpring ffeleose Piston Pressure Chamber Check Valve ^ . ^ ,. ^ ^Service Cylinder £x. EqualizingFislcn Equalizing m ^^[^^^; Cradualing --^~M$$^ Valvededuction LimilingChambe ^. FeleaseOrad ValveEqualizingSlideValve Equalizing^Piston 3 top EqualizingSlop Spring. Direct vQroduoled Release Cop ServiceEmergency Ci^linderEK. Cylinder^ ^Emerg. Slide Valve^iEV77 ergencg Reservoir Emergency CylinderFig. 120. Secondary Service Position of Westinghouse 3-E Control Valve valve to chamber F, thus balancing the pressures in chambers F andB on the opposite sides of the small end of the equalizing piston. This position, it should be understood, is assumed only momen-tarily and should be regarded as the first stage only of the completemovement of the parts from release and charging to the serviceposition of the parts. (b) Secondary Service Position. The balancing of the pres-sures in chambers F and D, as explained, permits the equalizingpiston to move in accordance T\dth the difference of pressure alreadyexisting between chambers D and A. When the shoulder on theend of the piston stem comes in contact with the equalizing s
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidairbrakesuptodat00ludy
