Vane Pumps

Pumps ·

Vane pumps are positive-displacement rotary machines in which a slotted rotor carries a set of flat vanes that slide radially outward under centrifugal force or spring pressure to maintain contact with the pump casing. The eccentric position of the rotor inside the casing creates expanding and contracting fluid pockets that draw in and expel fluid on each revolution.

History

The sliding vane pump was patented by Charles C. Barnes of Sackville, New Brunswick, Canada on 16 June 1874 under US Patent 152,924. Barnes designed the pump as a more compact and self-compensating alternative to piston pumps for water supply duty, using flat vanes that slide radially in slots in the rotor and seal against the casing wall under centrifugal force. The design was subsequently refined for petroleum transfer service: Blackmer Pump Company of Grand Rapids, Michigan — founded in 1903 — was the first manufacturer to mass-produce sliding vane pumps specifically for fuel oil and LPG handling, establishing the petroleum vane pump as a standard product class that the company continues to lead worldwide today.

Operating Principle

The rotor is mounted eccentrically inside a circular or cam-shaped casing. As the rotor spins, the vanes slide outward and press against the casing wall, dividing the annular space into sealed chambers. On the inlet side the chambers expand as the gap between rotor and casing increases, drawing fluid in. On the outlet side the chambers contract as the gap decreases, expelling fluid at higher pressure. Wear of the vane tips against the casing is self-compensating — vanes slide further out as they wear.

Vane Configurations

  • Spring-loaded vanes: Springs behind each vane ensure contact at low speed and on start-up — common in LPG and fuel-handling pumps
  • Pressure-loaded vanes: System pressure acts behind the vanes — better for high-speed, high-pressure applications
  • Rigid vane (slipper): Rigid metal slipper maintains contact via a cam ring — for hydraulic power unit service
  • Flexible vane: Rubber vanes flex to conform to the casing — for gentle handling of fragile materials and reverse-flow capability

Key Technical Parameters

  • Flow rate (Q): 0.5 to 200 m³/h
  • Differential pressure: Up to 20 bar for standard designs; up to 50 bar for hydraulic cartridge designs
  • Viscosity range: 0.5 to 500 cSt — best performance at 10 to 50 cSt; not suited to very viscous fluids
  • Speed: 300 to 3,600 RPM
  • Temperature: Typically −20 to +120 °C depending on vane and seal materials

Applications

  • LPG (liquefied petroleum gas) transfer at depots, terminals and retail forecourts
  • Aviation fuel dispensing — Jet A-1, Avgas
  • Fuel oil transfer and burner supply systems
  • Solvent transfer in chemical, paint and coatings manufacturing
  • Hydraulic power units — particularly mobile machinery
  • Automotive power steering and automatic transmission hydraulics
  • Wine, spirits and thin beverage transfer in food and beverage industry

Advantages

  • Self-compensating for vane wear — maintains performance over extended service life
  • Low noise and smooth flow — fewer pulsations than piston or gear pumps
  • Self-priming in most configurations
  • Good efficiency at low to moderate viscosities
  • Compact and lightweight for the flow rate and pressure delivered
  • Handles vapour-producing fluids (LPG, solvents) better than gear pumps

Limitations

  • Not suitable for abrasive fluids — particles accelerate vane and casing wear
  • Viscosity window is narrow: efficiency drops below 5 cSt (too thin) and above 500 cSt (too viscous)
  • Vanes and casing liners are wear items requiring periodic replacement
  • Temperature limits are set by vane material — standard phenolic or carbon vanes degrade above +90 °C
  • Fluid must have some lubricating properties to prevent vane tip and casing scoring

Selection Criteria

  • Confirm fluid viscosity at operating temperature falls within 5 to 500 cSt — outside this range consider a gear or screw pump
  • Check fluid for abrasive content — vane pumps require clean filtered fluid; install a 25 to 75 micron strainer on the suction line
  • Select vane material: phenolic resin for petroleum and solvents, carbon-PTFE for thin aqueous fluids, PEEK for elevated temperature
  • Verify the fluid has sufficient lubricity — dry gases and water-based fluids require special coatings or ceramic vanes
  • Choose spring-loaded vanes for infrequent start-stop service; pressure-loaded for continuous high-speed operation
  • Match shaft seal to fluid — lip seal for petroleum, mechanical seal for solvents and chemicals

Top 10 Manufacturers

  • 1. Blackmer / PSG (Dover Corporation) (USA) — ~20% global market share; founding manufacturer for petroleum vane pumps
  • 2. Mouvex / PSG (France) — ~14%; eccentric disc and vane pumps for LPG and chemical transfer
  • 3. Tuthill Transfer Systems (USA) — ~10%; sliding vane pumps for fuel and lubricating oil transfer
  • 4. Corken Inc. / IDEX (USA) — ~9%; sliding vane for LPG, ammonia and compressed gas service
  • 5. IDEX / Liquid Controls (USA) — ~8%; vane meters and transfer pumps for petroleum applications
  • 6. Settima Meccanica srl (Italy) — ~7%; hydraulic vane pumps for industrial machinery
  • 7. Jurop SpA (Italy) — ~6%; vane pumps for tank truck and vacuum tanker service
  • 8. Bosch Rexroth AG (Germany) — ~5%; hydraulic vane pump cartridges for mobile machinery
  • 9. Parker Hannifin (USA) — ~5%; vane and piston hydraulic systems for industrial presses
  • 10. Continental Hydraulics (USA) — ~4%; vane pump cartridges and power units for machine tools