300 PC PASSENGER-BRAKE EQUIPMENT 



the release slide valve, to the upper side of the pressure-chamber 

 check- valve 16b. Port * leads from the release slide-valve seat 

 to the port i in the equalizing slide-valve seat; also, a branch 

 leads to chamber F, surrounding the equalizing piston stop. 

 Port j leads from the release slide-valve seat to the chamber 

 below the small piston of the emergency valve 108. Port k 

 connects the two ports in the application-valve seat and leads 

 to the service-cylinder exhaust. Port / leads from the equal- 

 izing slide-valve seat to the application chamber X; also, one 

 branch leads to port / in the release slide-valve seat, and a 

 second branch to chamber C, ahead of the application piston 

 78. Port /' leads from the release slide-valve seat to the appli- 

 cation-chamber exhaust; also, a branch leads to the direct and 

 graduated release cap 18. Port m connects the two ports m 

 in the .equalizing slide-valve seat and leads to the reduction- 

 limiting chamber y. Port em leads from chamber M, back of 

 piston 78, to the emergency slide-valve seat. Port n leads from 

 the service cylinder to chamber O, in the application portion; 

 also, it is connected by a branch en with port en of the emergency 

 slide-valve seat. Port o leads from the emergency slide- 

 valve seat to the emergency cylinder. Port o' leads from the 

 emergency slide-valve seat to the emergency-cylinder exhaust. 

 Port p leads from the release slide-valve seat to the chamber P, 

 above the emergency piston 108. Port q leads from the release 

 slide-valve seat to the direct- and graduated-release cap 18. 

 Port r leads from the release slide-valve seat to chamber W 

 below the quick-action closing valve 139 Port 5 leads from 

 the chamber T above the quick-action closing valve 139 into 

 the passage o. Port u leads from the chamber D surrounding 

 the equalizing slide valve to such a position in the small equal- 

 izing piston bush 37, that when the piston is in certain positions, 

 the port connects chamber D with chamber F. Port v leads 

 from the equalizing slide-valve seat into the chamber C above 

 the small piston of the service-reservoir charging valve. Port 

 x leads from the equalizing slide-valve seat to the chamber K 

 below the large piston of the service-reservoir charging valve. 

 Port y leads from the equalizing slide-valve seat to the chamber 

 E surrounding the release valve. Port qx leads from chamber 

 x, below quick-action piston 131, to the quick-action exhaust. 



