PRINCIPLES OF NAVAL ENGINEERING 



cylinders. Two-stage, V-type low pressure com- 

 pressors usually have one cylinder for the first 

 (lower pressure) stage of compression, and one 

 cylinder for the second (higher pressure) stage 

 of compression. W-type compressors have two 

 cylinders for the first stageof compression, and 



one cylinder for the second stage. This arrange- 

 ment is shown in the two- stage, three- cylinder, 

 radial arrangement in part A of fig. 17-4, 

 Compressors may be classified according to 

 a number of other design features or operating 

 characteristics. 



INTERCOOLER 



INTERCOOLER 



UNLOADER 



UNLOADER ^■ 



GUARD r 





GUARD 



FEATHER 

 VALVE 



HIGH PRESSURE 

 SUCTION 



2 NO STAGE 

 PISTON 



LOW PRESSURE 

 DISCHARGE 

 i 

 1ST. STAGE 



PISTON 



»OIL RESERVOIR 



47.152 



Figure 17-3,— Reciprocating air compressor (vertical V, two stage, single-acting, 



low pressure). 



440 



