178 



TRIPLE VALVES 



length and weight necessitated a quicker serial action of the 

 brake in service applications, a retarded release of the head 

 brakes, and a uniform recharge of the head and rear auxiliaries 

 to permit the train to be handled successfully. The type K 

 triple valve embodies these additional features as well as all 

 the features of the type H triple. A diagrammatic view of the 

 triple valve is given in Fig. 11. 



FIG. 11 



Quick-Service Feature. The object of the quick-service 

 feature is to quicken the serial application of the brakes on 

 long trains, so as to reduce the interval between the application 

 of the first and the last brakes. This is accomplished by 

 each triple valve venting brake-pipe air momentarily through 

 a restricted passage into the brake cylinder, thus producing 

 at each triple a slight brake-pipe reduction that is quickly 

 transmitted from car to car throughout the brake pipe in a 



