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Rotary positive displacement pumps can be grouped into three main types:
- Gear pumps - a simple type of rotary pump where the liquid is pushed between two gears.
- Screw pumps - the shape of the internals of this pump usually two screws turning against each other pump the liquid.
- Rotary vane pumps - similar to scroll compressors, consisting of a cylindrical rotor encased in a similarly shaped housing. As the rotor turns, the vanes trap fluid between the rotor and the casing, drawing the fluid through the pump.
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