



If You Will Study The Details of Construction of The 



"American" Centrifugal You Will See Why No Other 



Centrifugal Equals Its Efficiency 



A^L Volute Centrifugal Pumps look much alike from the outside. It is when you 

 lift the cover and study the details of construction, the material, the adjust- 

 ments and the workmanship that you 'see why one centrifugal will only develop 50 

 per cent efficiency and another 82 per cent. 



It is in the refinement of the flow-lines, t!e rotative and end thrust balance of the impeller, the 

 machining of the impeller and interior of the teasing, the adjusting of the impeller in the casing like 

 a watch, the packing and water sealing of the glands and the wide bearings, perfectly babbitted and 

 lubricated with ring oilers from oil cellars that form the marks of quality in a centrifugal. 



The rotating discs are separated by a stationary 

 central sleeve having opposed dished discs at its ends fac- 

 ing the rotating discs with bronze annular ring facings 

 and have highly polished surfaces to produce a perfect 

 bearing. 



In operation, these discs are wholly submerged in 

 circulating water and when the end thrust carries the discs 

 sufficiently close together in either direction so that a ro- 

 tating and a stationary disc are only separated by a film 

 of water, the water contained in the 'enclosed cupped space 

 is held under pressure and acts as a water cushion against 

 the further end thrust of the shaft in that direction. 



There is practically no friction in this balance, since 

 it is always submerged in circulating water it requires no 

 lubrication and it is impossible for it to heat or get out of 

 order. 



No other centrifugal has so perfect thrust bearings. 

 Study any detail of the "American" centrifugal and you 

 will find the same matchless construction. 



Take the end thrust bearings in the single suction 

 enclosed runner, "American" Volute Centrifugal as an 

 example: 



It is a well known fact that the intake of water on 

 one side produces an end thrust on the impeller and shaft 

 toward the side opposite to the intake. 



In most centrifugals no provision is made to over- 

 come this end thrust while a few have what is termed 

 marine type thrust bearings, which consist of a scries of 

 annular rings placed on one end of the shaft and rotating 

 in a recessed casing. These bearings are difficult to keep 

 properly lubricated, are not perfectly water cooled, add 

 to the friction and frequently cause trouble through 

 heating. 



The "American" thrust bearings consist of two ro- 

 tating opposed cupped discs keyed onto the shaft irf'an 

 extension of the main casing. 



If you are looking for the quality in a centrifugal that will prove cheap* 

 est in the end better write for catalog 117, the most complete centrifugal 

 catalog ever issued. 



The American Well Works 



General Office and Works: Aurora, 111. 

 Chicago Office: First National Bank Bldg. 



