PC PASSENGER-BRAKE EQUIPMENT 



291 



The pressure chamber Z extends backwards from the partition 

 a, Fig. 2, and surrounds the inner-reservoir wall b, as shown; 

 the drain plug for this reservoir is numbered 154- 



Equalizing Portion. The equalizing portion of the control 

 valve consists of two parts, the release portion, and the equal- 

 izing portion. The release cylinder is shown in section in Fig. 4. 

 The release slide-valve seat is shown in Fig. 5. Port p leads to 

 chamber P of the large emergency piston; port j, to chamber 

 5 of the small emergency piston; port e, to the direct and 



FIG. 7 



graduated release cap 18; ports *, to the emergency-piston 

 exhaust; port q, to the direct 'and graduated release cap; port 

 I', to the application-chamber exhaust and to the direct and 

 graduated-release cap; port I, to the application chamber; 

 port r, to the quick-action closing valve; port c', to the emer- 

 gency reservoir; and port i, to chamber F of the small equalizing 

 piston. 



The release slide vak'e is shown in Figs. 6 and 7. Fig. 7 (a) 

 is a sectional view; (b), a plan of the face of the valve; (c). 



