Low Viscosity Pumps, or vane pumps move fluid using the rotary motion of multiple sliding vanes. Vane pumps consist of a slotted rotor rotating inside a cam shaped housing. This rotor is located close to the wall of the cam so that a crescent-shaped cavity is formed on the opposite wall.

Each rotor slot contains a sliding vane. As the rotor rotates, centrifugal force, hydraulic pressure, and push rods work together to extend each vane to the casing wall. This creates an expanding cavity on the inlet side – creating a vacuum which pulls liquid into the pump. Liquid is trapped between the vanes and the casing wall. The rotor rotation moves the liquid cavities around to the outlet side of the pump.

At the outlet side, the vanes are forced back into their slots, decreasing the cavity size and forcing the liquid through the outlet port.