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Ring Rotor Pump

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With the ring and rotor in the pump, notice how the vanes move in and out of the slots in the rotor as the rotor spins within the oval ring due to centrifugal force. As the space between two vanes increases, it forms a vacuum and pulls fluid in from the reservoir. Then as the space decreases it compresses the fluid. Then as the rotor turns it passes over an opening where the compressed fluid can escape and is routed into the piston chamber.