152 TRIPLE VALVES 



reversing cock may stand. The position to the left is used 

 when the engine is to be coupled to a train having the ordinary 

 quick-action brake. In this position, the feed-valve that is 

 adjusted for 70 Ib. is cut in and the one for 110 Ib. is cut out, 

 and the brake-pipe pressure is regulated to 70 Ib. per sq. in. 

 If the engine is to be coupled to a train of high-speed brakes, 

 the handle of the reversing cock is moved around to the right 

 into the second position. This cuts into service the feed-valve 

 that is adjusted for 110 Ib., and the train-p'ipe pressure is then 

 regulated to that amount. This duplex feed-valve is usually 

 placed in the cab. 



TRIPLE VALVES 



PLAIN TRIPLE VALVES FOR ENGINES 

 AND TENDERS 



Prior to 1903, the F-24 plain triple valve and, later, the 

 G-24 triple were recommended for all driver-brake cylinders 

 10 in. or less in diameter, with or without track brakes. The 

 F-25 plain triple was recommended for 12-in., 14-in., and 16-in. 

 driver brakes, with or without truck brakes. The F-46 was 

 recommended for high-speed brakes with all sizes of driver- 

 brake cylinders with or without truck brake. Later, the F-46 

 triple was recommended for universal use for 12-in., 14-in., and 

 16-in. driver-brake cylinders, with or without truck brake. The 

 H-24 triple was then designed for use with all driver-brake 

 cylinders 10-in. or less, with or without truck brake. 



For both freight-engine and switch-engine tenders, the G-24 

 triple was supplied for use with 8-in. and 10-in. cylinders, 

 and the F-25 triple for 12-in. cylinders. 



The G-24 plain triple valve, formerly furnished for use 

 with 8-in. and 10-in. freight- and switch-engine tender brake 

 equipments, has been superseded by the F-l (H-24) triple 

 valve. The F-25 plain triple valve, formerly furnished for 

 use with 12-in. freight- and switch-engine tender brake equip- 

 ments, has been superseded by the F-2 (F-46) triple valve. 



