ENGINEER'S BRAKE VALVES 123 



PC. No. Rcf. No. Name of Part 



15,534 19 Lower gasket. 



OPERATION OF H-6 AUTOMATIC BRAKE VALVE 

 Charging and Release Position. The purpose of the char- 

 ging and release position is to provide a large, direct passage 

 from the main reservoir to the brake pipe, to permit a rapid 

 flow of main-reservoir air into the brake pipe to charge the" 

 train-brake system; to quickly release and recharge the brakes; 

 to hold the locomotive brakes, if they are applied. Air at 

 main-reservoir pressure flows through port a in the rotary 

 valve and port b in the valve seat into the brake pipe. Port j 

 in the rotary valve registers with equalizing port g in the valve 

 seat, permitting main-reservoir air to blow into chamber D 

 above the equalizing piston. 



If the handle is allowed to remain in this position, the 

 brake system will be charged to main-reservoir pressure. To 

 avoid this, the handle must be moved to running or holding 

 position. A small port discharges feed-valve pipe air to the 

 atmosphere in release position, to prevent the engineer from 

 forgetting that the handle is in release position. Cavity / in 

 the rotary valve connects port d with warning port r in the seat 



