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, push 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 cambers) 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.
.
