. Official proceedings . 5 ^^^^ 69 The diagram of Figure 35 illustrates the pressure changesfrom those shown in Figure 3Jr which are quickly accomplishedby the flow of auxiliary reservoir and brake cylinder pressureto the brake i)ipe. It will be noted that the brake pipe pres-sure rises quickly from 20 to 37 lbs. and the auxiliary reservoir])ressure reduces from 60 to 48 lbs. which is about the same\alue as would be encountered when releasing after a full serv-ice application. \\hen the brake pipe pressure is raised from 37 to 49^^lbs. as shown in Figure 3G, the Ij^ lbs. release differential i
. Official proceedings . 5 ^^^^ 69 The diagram of Figure 35 illustrates the pressure changesfrom those shown in Figure 3Jr which are quickly accomplishedby the flow of auxiliary reservoir and brake cylinder pressureto the brake i)ipe. It will be noted that the brake pipe pres-sure rises quickly from 20 to 37 lbs. and the auxiliary reservoir])ressure reduces from 60 to 48 lbs. which is about the same\alue as would be encountered when releasing after a full serv-ice application. \\hen the brake pipe pressure is raised from 37 to 49^^lbs. as shown in Figure 3G, the Ij^ lbs. release differential issufficient to open the release insuring feature and the valve isreleased promptly. The reduction of auxiliary reservoir pres-sure by the action of the release insuring feature, in case ofhigh slide valve friction, is shown graphicallv in Figure BASIC BRAKE PIPE REDUCTIONS AND BRAKE CYLINDER PRESSURES PRODUCED BY QUICK SERVICE ACTION OF K AND AB TRIPLE VALVES. The line plotted on Figure 38 shows the brake cylinderpressure developed for various brake pipe reductions for boththe K and AB brake equipments. The c|uick service action is controlled in the K triplevalve so the least stable brake pipe reduction that can be madeis about 5 lbs. and this will produce a brake cylinder pressureof 4 lbs. gage or 19 lbs. absolute pressure. 70 The minimum of 4 lbs. cylinder pressure is of negligibletrain retardation value because this pressure is not sufficient toovercome brake cylinder and rigging resistance and produceretarding force. The AB equipment is stabilized so that theminimum cylinder pressure for an initial reduction will be !Jto 10 lbs. gage and the initial brake pipe reduction will beabout lbs. This value of cylinder pressure produces a meas-ure of effective retarding force which is very necessary at thebeginning of all serv
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