Hydropump

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.