 These pumps have a number of vanes that are free to slide
into or out of slots in the pump rotor. When the pump driver turns the
rotor, centrifugal force, rods, and/or pressurized fluid causes the vanes
to move outward in their slots and bear against the inner bore of the pump
casing forming pumping chambers. As the rotor revolves, fluid flows into
the area between the vanes (pumping chambers) when they pass the suction
port. This fluid is transported around the pump casing until the discharge
port is reached. At this point the fluid is squeezed out into the discharge
piping.
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