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Vane Pump Product Guide

Brands We Repair:

  • Bosch
  • Denison
  • Moog
  • Racine
  • Rexroth
  • Vickers
  • and many more

What They Do:

Vane pumps can handle moderate viscosity liquids,
but they are better at handling low viscosity liquids such
as LP gas (propane), ammonia, solvents, alcohol,
fuel oils, gasoline, and refrigerants. Vane pumps
have no internal metal-to-metal contact and
self-compensate for wear, enabling them to maintain
peak performance on these non-lubricating liquids.
Though efficiency drops quickly, they can be used
up to 500 cPs / 2,300 SSU.

Vane pumps are available in a number of vane
configurations including sliding vane (left),
flexible vane, swinging vane, rolling vane, and
external vane. Vane pumps are noted for their dry
priming, ease of maintenance, and good suction
characteristics over the life of the pump.
The cam ring size determines the GPM flow ratings
for the pump. There are two plates within these pumps
- a wear plate and a pressure plate - on each side
of the rotor assembly, which is bolted together.
The primary internal assembly (pressure plate, wear plate,
cam ring, rotor and vanes) is called a cartridge kit, and can be replaced as a single unit.

Primary Types and How They Work:


External Vane Pump:

These can handles large solids.


Flexible Vane Pump:

Can only handle small solids but create a good vacuum.


Sliding Vane Pump:

These can actually run dry for a short period
and handle smaller amounts of vapor.


Repair Procedures:

  • Each slot is checked so that the vanes will be stable in the slot.
  • Every vane set is checked with a micrometer for proper thickness.
  • Each set is refinished and checked as a set to ensure that they are all the same length.
  • Vane tip surfaces are restored to condition in order to provide a proper vane tip-to-ring pattern.
  • Every cam ring inside contour is refinished using a series of polishing wheels that follow the contour to smooth out slight irregularities on the surface without changing the slope and dwell angles.
  • The inside contour of the ring is brought to within 16 RMS finish.
  • Every plate is lapped with a production machining line that uses different grits of lapping compound to remove imperfections.
  • This also leaves every plate within 12 millionths of an inch of flatness.
  • All depth of metering, timing notches and lubrication grooves are checked and recut to tolerance.
  • Every plate is surface treated to allow the microscopic film of oil that must be present between the plate and the rotor.
  • This ensures that the pump performance will be equal to new.


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Paragon Technologies
Paragon Canada
Paragon Atlantic
Paragon Pacific
Paragon Brazil

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