Vane Pumps are available in two types, Flexible Vane or Sliding vane.
Flexible Vane Pump consists of a rotor with flexible vanes protruding from its centre which rotates within a moulded offset cavity or housing. The elastomeric vanes have a ‘sweeping’ action in the expanded area of the casing moving liquids towards the outlet & re-compressing again to prevent the liquid from recirculating. This principle easily handles gaseous liquids like soda & beer, is easy to service & cheap to manufacture.
Sliding Vane Style Pump operates in a similar cavity however uses rigid carbon composite vanes that slide within the rotor. This enables them to attain higher pressures with a broader range of viscous liquids.