The RF Flexible Impeller Pump uses an impeller with flexible vanes to pump fluid. The flexing of the impeller vanes is controlled by a cam (an eccentricity) in the pump body between the inlet and discharge openings, and by the thickness, material and configuration of the vanes themselves. The placement of the cam causes each vane to flex as it moves over the discharge. Each vane returns to it’s original configuration as it moves over the inlet opening. This increases the volume between two adjacent vanes at the inlet, producing a vaccum that causes the fluid to flow into the larger space. The reduction in volume at the discharge forces fluid out into the discharge tube.
Flexible impeller pumps can be used to displace viscous fluids which cannot be handled by centrifugal pumps, and highly abrasive fluids that require hardened contact surfaces on the rotary elements of most PD rotary pumps.
Flexible impeller rotary pumps can handle many industrial substances, from slightly corrosive to highly acidic or alkaline fluids. They can also handle corrosive fluids containing suspended solids or gases, and can displace a very wide range of fluid viscosity. The flexing of the vanes creates a high vacuum and makes the pumps instantly self-priming.