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Positive Displacment
Pump
Tutorial

Positive Displacement Pumps are classified into two general categories and then subdivided into four/five categories each:

Single Rotor

Vane - The vane(s) may be blades, buckets, rollers or slippers which cooperate with a dam to draw fluid into and out of the pump chamber.

Piston - Fluid is drawn in and out of the pump chamber by a piston(s) reciprocating within a cylinder(s) and operating port valves.

Flexible Member - Pumping and sealing depends on the elasticity of a flexible member(s) which may be a tube, vane or a liner.

Single Screw - Fluid is carried between rotor screw threads as they mesh with internal threads on the stator.

Progressing Cavity - Fluid is carried between a rotor and flexible stator.

Multiple Rotor

Gear - Fluid is carried between gear teeth and is expelled by the meshing of the gears which cooperate to provide continuous sealing between the pump inlet and outlet.

Lobe - Fluid is carried between rotor lobes which cooperate to provide continuous sealing between the pump inlet and outlet.

Circumferential Piston - Fluid is carried in spaces between piston surfaces not requiring contacts between rotor surfaces.

Multiple Screw - Fluid is carried between rotor screw threads as they mesh.

Positive Pump Tutorial Topics


  1. Positive Pump Types
  2. Positive Displacement Pump Terms
  3. Positive Displacement Pump Viscous Fluids
  4. Positive Displacement Pump Viscosity Measurement
  5. Positive Displacement Pump Operation
  6. Positive Displacement Pump Friction Types
  7. Positive Displacement Pump Slip
  8. Positive Displacement Pump Horsepower and Torque
  9. Positive Displacement Pump Cavitation

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