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The gear and screw pumps are classified as _____.

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reciprocating pump  vane pump  screw pump  centrifugal pump  
reciprocating  diffuser  turbine  vane  
(1) and (2)  (1), (2) and (3)  (1) and (3)  (2) and (3)  
Reciprocating  Centrifugal  Rotary  Gear  
Lobe  Screw  Radial piston  Volute  
depending on  in relative to  regardless of  because of  
gear  nonpositive displacement  positive displacement  rotary  
Centrifugal  Gear  Propeller  Turbine  
Reciprocating pump  Screw pump  Diffuser pump  Water-ring pump  
reciprocating pumps  positive displacement pumps  centrifugal pumps  centripetal pumps  
Piston pump  Screw pump  Diffuser pump  Water-ring pump  
variable stroke pumps  multistage pumps  positive displacement pumps  triple-ported pumps  
lobe type  screw type  axial piston type  volute type  
Reciprocating pumps  Rotary pumps  Centrifugal pumps  Gear pumps  
spur geared  screw geared  worm geared  belt driven  
stuffing box diameter  direction of rotation of the screws  pitch of the screws  type of driving gears  
Centrifugal  Reciprocating  Gear  Rotary  
gear  vane  screw  centrifugal  
stuffing boxes eliminate the leakage problems usually associated with other gear pumps  it is not necessary to closely maintain design clearances with this pump  they are essentially self-priming and produce a high suction lift  these pumps are designed with extreme tooth angled  
reciprocating pumps  positive displacement pumps  centrifugal pumps  centripetal pumps  

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