AIR COMPRESSORS 79 



Jo. Name of Part 



Piston ring for rebored cylinder, 2ff in. 



diameter. 

 Piston ring, for rebored cylinder, 2ft in. 



diameter. 

 Piston ring, for rebored cylinder, 2| in. 



diameter. 

 Piston nut. 

 Piston spring. 

 1-in. union nut. 

 1-in. union swivel, 

 f-in. union swivel. 

 Diaphragm body, includes 29. 

 Spring box. 

 Check-nut. 

 Regulating nut. 

 Regulating spring. 



Diaphragm, complete, 32 to 36, inclusive. 

 Diaphragm ring. 

 Strainer. 



Union swivel, f-in. O. D. copper pipe. 

 Union nut. 

 Diaphragm nut. 

 Diaphragm valve. 

 Diaphragm washer. 

 Diaphragm-valve spring. 

 Diaphragm, 2 pieces, each. 

 Union swivel, J-in. iron pipe. 



Piece No. 1,949, is used with the new-style 8-in. (8"X8"X 10"), 

 the 9 i-in., and the 11-in. pumps. The 1-in. union swivel, Piece 

 No. 2,051, is used with the old-style 8-in. pump (8"X?i"X9"). 

 Where J-in. iron pipe is to be used for air connection, specify 

 Piece No. 2,049, for the S-4 steam compressor governor, com- 

 plete, and Piece No. 2,047, for diaphragm portion complete; 

 then union swivel, Ref. No. 40, will be substituted for union 

 swivel, Ref. No. 30. If governor is to be used with old-style 

 8-in. (8"X 7|"X9") air compressor, specify Piece No. 24,975, 

 for S-4 steam compressor governor, complete, with air con- 

 nection for copper pipe, or Piece No. 10,700, for S-4 steam 

 compressor governor, complete, with air connection for J-in. 

 iron pipe; and Piece No. 10,701, for steam portion only; f-in. 

 union swivel, Piece No. 2,051 will then be supplied. 



Operation of Governor. The regulating spring is, generally, 

 adjusted to just withstand a main-reservoir pressure of 90 Ib. 

 pushing upwards on the diaphragm. When the pump is in 



