RECIPEOCATING PUMPS 



595 



impossible with a reciprocating pump fitted with this type of valve, and 

 it becomes necessary to use a long stroke, slow rotation pump, giving 

 ample time for the valves to come to rest at the end of each stroke. With 



TO DELIVERY 

 MAIN" 



FROM INDIP. 

 EJ.KCT. AIK 

 (.'HAHtlKK 



RETURN OIL 

 PUMP 



PROM 



SUCTION MAIN 



FIG. 283. Gutermuth 3-Throw Pump ; 6-inch diameter ; x 10-inch stroke ; 

 X 180 revs, per min. ; 1,000 gallons per min. ; 750 ft. head. 



this type of pump, and until comparatively recently, the maximum 

 attainable piston speed was about 100 feet per minute at about sixty 

 revolutions per minute. 



By paying special attention to the design of valves arid water passages 



n n 9. 



