222 



TRIPLE VALVES 



During an emergency application, communication between the 

 auxiliary reservoir and the brake cylinder is established through 

 port 5 in the slide valve and port r in the seat. 



Check- valve 15 will remain unseated until the brake-cylinder 

 pressure is nearly equal to the brake-pipe pressure; the emer- 

 gency valve 10 will be seated as the auxiliary and brake-cylinder 

 pressures equalize; and the by-pass valve will remain unseated 

 until the auxiliary-reservoir and brake-cylinder pressures are 

 nearly equal to the pressure remaining in the supplementary 

 reservoir. This action will result in a brake-cylinder pressure 

 nearly equal to maximum brake-pipe pressure, and as cavity q 

 in the slide valve is moved from over port r the safety valve is 

 no longer connected to the brake cylinder; consequently, the 

 high brake-cylinder pressure will be maintained until the brake 

 is released in the usual manner. 



PASSENGER-BRAKE TEST 



Rack Tests. In Pig. 1 are shown the results of standing 

 train tests made with the high-speed and the LN equipments, 



JIO 



/S ZO 23 JO 



T/mc-Jecc/iate 

 FIG. 1 



Jff 



4$ 



to determine the comparative time required to recharge the 

 auxiliary reservoir after a 20-lb. service reduction has been 

 made. The six-car trains carried 110-lb. brake-pipe pressure 



