292 



PC PASSENGER-BRAKE EQUIPMENT 



a plan of the top of the valve; (</), a vertical section, showing 

 the ports e, I', and r. Port e extends through the valve, as 

 shown. Port i leads from the cavity i in face 

 of the valve to the upper face of the valve; 

 port j, from the face of the valve into port '; 

 and port /', from the face of the valve to the 

 small port V in the upper face. Port / connects 

 with port q and leads to the small port I in the 

 upper face. At r is shown a tail-port, or 

 groove, in the end of valve. Port t leads from 

 the face of the valve to the small port t in the 

 PIG. 8 upper face. 

 The release valve graduating valve, Fig. 8, merely has two 



FIG. 9 



cavities in its face. One of these cavities is always connected 

 to the emergency-piston exhaust in all positions of the valve. 



