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130    Cha pte r  F o u r






















               FIGURE 4.43  The pressure head and effi ciency of a typical single-stage
               centrifugal pump.





          4.9 Pump Summary
               The following are the common features of the displacement pumps
               (most of the illustrations in this section appear courtesy of Bosch
               Rexroth AG):




                  Pump Type and
           No.    Typical Data                     Illustration
           1   Axial piston pump
               (bent axis)
               Depending on the inclination
               angle, the pistons move
               within the cylinder bores
               when the shaft rotates.
                V = 2–3600 cc
                 g
                n = 500–5000 rpm
               p  = 400 bar
                max
                    π
                   V =  d Dzsin α
                      2
                 g  4
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