AIR COMPRESSORS 31 



PC. No. Ref. No. Name of Part 



3.269 91 Short capscrew, f in.X2 in. 



3.270 92 Long capscrew, fin. X2| in. 



2.682 101 Exhaust stud. 

 2,684 102 Exhaust-union nut. 



2.683 103 Exhaust-union swivel. 

 8,728 li-in. pipe plug. 

 8,726 2-in. pipe plug. 



Standard 11-in. air compressor has steam- and exhaust-pipe 

 connections similar to those of the so-called right-and-left- 

 hand 9|-in. compressor, and it can therefore be installed on 

 either side of the locomotive with equal facility. 



The list given applies only to standard 11-in. air compressor 

 having air cylinder 11 in. in diameter. Orders for repair parts 

 for special 11-in. compressors having air cylinders other than 

 11-in. in diameter, or with water-jacket, should omit piece 

 number, but give reference number, name of piece, and either 

 diameter of air cylinder or serial number on name plate. 



When this compressor is ordered complete, for industrial, or 

 other than railroad-brake service, order should so state, and 

 specify Piece No. 19,394. When so ordered, packing and 

 cap-nut wrench, Piece No. 2,482 (instead of Piece No. 15,496), 

 air-valve-seat wrench, Piece No. 2,485, air-valve-cage wrench, 

 Piece No. 2,483, and wrench for f-in. capscrews, Piece No. 1,938, 

 are included with the compressor, without extra charge. 



8HN., CROSS-COMPOUND AIR COMPRESSOR 

 Piston- Valve Type. The 8^-in., cross-compound, air com- 

 pressor, shown in Fig. 4, is of the Siamese type, having two 

 steam and two air cylinders arranged side by side respectively. 

 The steam cylinders are at the top. The high-pressure steam 

 cylinder is 8$ in. in diameter, the low-pressure 14J in. in diam- 

 eter, and the stroke is 12-in. The low-pressure air cylinder is 

 14$ in. in diameter and the high-pressure air cylinder, 9 in. in 

 diameter. The valve gear is on the top head of the high- 

 pressure steam cylinder and is of a design similar to that of 

 the 9J-in. and 11-in. pumps. 



The high-pressure steam piston with its hollow rod contains 

 the reversing- valve rod that operates the reversing valve and, 

 thus, the main valve and its slide valve, which controls steam 



