A progressing cavity pump is a positive displacement pump employing a helical 'worm' rotor and stator assembly to create temporary chambers to draw fluid into, which 'progress' through the pump resulting in the fluid being expelled through the discharge port.
A typical progressing cavity pump features a suction inlet which feeds into an elongated casing. Within this casing sits a helical 'worm' rotor and stator assembly. The rotor helix is shaped off-set to the stator creating cavity spaces in the assembly which are formed by temporary seals as the rotor contacts the surface of the stator. As the rotor begins to move in an eccentric fashion, the cavities form, draw in product and are 'progressed' along the assembly and the product is expelled through the discharge port.
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