TRIPLE VALVES 



225 



In Fig. 4 are shown the pressures in the brake cylinder, 

 brake-pipe, and auxiliary reservoir of an LN equipment that 

 has 110 Ib. brake-pipe pressure, when a 30-lb. service reduction 

 is followed by an emergency application and release. The 

 curves show that it required about 6.5 sec. to make the 30-lb. 

 brake-pipe reduction in this case. This reduced auxiliary 



FIG. 4 



pressure to 82 Ib. and gave a brake-cylinder pressure of over 

 60 Ib. After about 10.5 sec. from the beginning of the appli- 

 cation, an emergency application was made reducing brake- 

 pipe pressure to 0, and raising the brake-cylinder pressure to 

 104 Ib., but without further reducing auxiliary reservoir pres- 

 sure; 20 sec. from the beginning of the application, a release 

 16 



