290 



PC PASSENGER-BRAKE EQUIPMENT 



and application chambers of the control valve. If, after 

 equalization has taken place, a further brake-pipe reduction 

 occurs, air is automatically vented from the pressure chamber 

 into the reduction-limiting chamber, up to the point of equal- 

 ization, fast enough to maintain the pressure-chamber pressure 

 constant at the pressure of equalization. This, of course, 

 maintains the application-chamber pressure constant, which 



Ex 



o 







FIG. 5 



FIG. 6 



automatically maintains the brake-cylinder pressure constant. 

 The capacities of the application and the pressure chambers 

 are such that, with a 24-lb. reduction from 110 Ib. of brake-pipe 

 pressure, they will equalize at 86 Ib.; from 70 Ib. of brake-pipe 

 pressure, they will equalize at 54 Ib. with a 16-lb. reduction. 



In Fig. 2, the drain plug for the reduction-limiting chamber 

 is shown at l5J^a. 



