Rotary vane pump
Positive-displacement pump consisting of vanes mounted to a rotor that rotates inside a cavity / From Wikipedia, the free encyclopedia
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A rotary vane pump is a type of positive-displacement pump that consists of vanes mounted to a rotor that rotates inside a cavity. In some cases, these vanes can have variable length and/or be tensioned to maintain contact with the walls as the pump rotates.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Pompe_%C3%A0_palettes.gif/220px-Pompe_%C3%A0_palettes.gif)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Rotary_vane_pump.svg/640px-Rotary_vane_pump.svg.png)
1. pump housing
2. rotor
3. vanes
4. spring
This type of pump is considered less suitable than other vacuum pumps for high-viscosity and high-pressure fluids[citation needed], and is complex to operate[clarification needed][citation needed]. They can endure short periods of dry operation, and are considered good for low-viscosity fluids[citation needed].