Flexible impeller pumps work by deforming a special flexible impeller. As it deforms on the outlet side, it pushes the fluid out of the pump, whist on the inlet side, the impeller returns to it’s normal state, creating suction. The diagram shows this process in more detail. Flexible impeller pumps are gentle on fluids, but still have a high self-priming action. As they are industrial pumps, they are widely used in the chemical, food processing, wine-making, and cosmetic industries.