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Rotary Vane Pump

Rotary Vane Pump Working Principle

A rotary vane pump is a positive displacement pump. The rotary vane Vacuum pump is the other well-known name of the rotary vane pump. These pumps consist of a slotted rotor splendid to the drive shaft which rotates inside a cam ring in a pump casing.  Vanes fitted to the rotor slots matching with the inner diameter of the ring. During the rotation of the rotor, the centrifugal force and the system pressure behind the vanes push the radially moveable vanes towards the outside. The vanes take positions with their external edge touching with the internal running area of the cam.  Thus, Pumping chambers formed between the vanes and enclosed by the rotor, ring, and two side plates.

At the suction side, a partial vacuum created as the space between the rotor and the ring increases. Liquid entering here trapped in the pump chambers and then pushed to the outlet as the space decreases. The displacement of the vane pump depends on the width of the ring and rotor and on the throw of the cam ring.


Most fixed displacement rotary vane pumps utilize the balanced cartridge design. In this design, the cam ring is elliptical rather than a circle and permits two sets of internal ports. The cam is designed as double eccentric such that each vane is involved in the delivery process twice per revolution. The outlet ports are 180 degrees apart so that pressure forces on the rotor are canceled out preventing side loading of drive shaft and bearings.

Vane Pump
Rotary Vane Pump

The vane pumps are available in various designs covering the low to medium volume ranges with operating pressures up to 200 atmospheres. They are reliable, efficient and easy to maintain. Various control units, like pressure controller, flow pressure controller, and horsepower controller provided by the manufacturer as per customer requirement. Cleanliness and the proper liquid are essential to the long life of the rotary vane pump.


  1. High-pressure hydraulic pumps used in the Automobile industry such as auto transmission, power steering, and air conditions
  2. Medium pressure pumps used in espresso coffee machines and carbonators for fountain soft-drink dispensers
  3. Low-pressure gas applications such as in low-pressure chemical vapor deposition systems or secondary air injection for auto exhaust emission control
  4. Rotary vane vacuum pumps provide braking help in diesel-powered passenger cars and in large trucks. It also uses in most light aircraft to drive gyroscopic flight instruments, in vacating refrigerant lines during the installation of air conditioners. Physics vacuum experiments and laboratory freeze dryers also use a vane vacuum pump
  5. Adequate anti-wear petroleum products pumped satisfactorily and reliably

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