. Air brake text for engineers and firemen; . ce it over and permit air to flow to the brake pipe. Butif piston 54 is fitted too loosely in the bushing, a greater volumeof air will pass the piston than can escape at regulating valve 59,and will result in holding supply valve 55 and piston 54 closed. If the trouble is due to improper adjustment of regulatingspring 67 it can be remedied by increasing the tension of thespring, but if it is due to passage c, c, being stopped up or piston54 being stuck shut in the bushing, with the slide valve to itsseat, piston 54 and slide valve 55 should be enti
. Air brake text for engineers and firemen; . ce it over and permit air to flow to the brake pipe. Butif piston 54 is fitted too loosely in the bushing, a greater volumeof air will pass the piston than can escape at regulating valve 59,and will result in holding supply valve 55 and piston 54 closed. If the trouble is due to improper adjustment of regulatingspring 67 it can be remedied by increasing the tension of thespring, but if it is due to passage c, c, being stopped up or piston54 being stuck shut in the bushing, with the slide valve to itsseat, piston 54 and slide valve 55 should be entirely removed,cap nut 53 replaced and the pump governor regulated so that itwill stop the pump at seventy pounds. If the duplex governor isused the ninety-pound governor should be regulated to seventypounds. 63 WESTINGHOUSE TRIPLE VALVES. THE PLAIN TRIPLE VALVE. The plain triple valve is now used on locomotives and tendersonly, it having been superseded on all other classes of equipmentby the quick action triple valve. AUTOMATIC TO TRAIN PIPE. PLATE 26. In the study of the triple valve, as well as other parts of theair brake or air signal equipment, a clearer understanding willresult if one starts at the problem by first asking himself thequestion, which is the greater or controlling pressure acting on WESTINGHOUSE TRIPLE VALVES. the part in question? With this point thoroughly understood,the action of the parts under consideration can be readily traced;for example, if a brake pipe reduction is made, it is known thatit will have the effect of lowering the pressure on the brake pipeside of the triple piston and cause the brake to apply. It is alsoknown that when the brake pipe pressure is increased the ten-dency will be for the piston to move away from the greater brakepipe pressure, causing the brake to release. The different parts of the plain triple valve are shown on Plate26; 13 is the cut-out cock and handle; 8 the graduating stem;9 the graduating spring; i and k. are f
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