Positive Tutorial
Positive Displacement Pumps are classified into two general categories and
then subdivided into four/five categories each:
| POSITIVE DISPLACEMENT PUMPS |
 |
SINGLE ROTOR |
MULTIPLE ROTOR |
|
|
VANE
PISTON
FLEXIBLE MEMBER
SINGLE SCREW
PROGRESSING CAVITY
|
GEAR
LOBE
CIRCUMFERENTIAL PISTON
MULTIPLE SCREW |
- 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.
  
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Pump
Tutorial CDROM $19.95
