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A progressive cavity pump is a type of positive displacement pump and is also known as a progressing cavity pump, progg cavity pump, eccentric screw pump or cavity pump.
It transfers fluid by means of the progress, through the pump, of a sequence of small, fixed shape, discrete cavities, as its rotor is turned. This leads to the volumetric flow rate being proportional to the rotation rate (bidirectionally) and to low levels of shearing being applied to the pumped fluid.
These pumps have application in fluid metering and pumping of viscous or shear-sensitive materials. The cavities taper down toward their ends and overlap. As one cavity diminishes another increases, the net flow amount has minimal variation as the total displacement is equal. This design results in a flow with little to no pulse.

Eccentric screw pumps design for applications in the hygiene industry, such as food, beverages, milk, cosmetics, etc.
The flow rates range from 0.1 m3/h to approx. 150 m3/h depending on the pump size. Depending on the number of stages, the pumps achieve the following pressures at the outlet connection: 1-stage pump up to 6 bar, 2-stage pump up to 12 bar, 4-stage pump up to 24 bar.

Eccentric screw pumps are made of stainless steel and are the reliable solutions for many branches of industry. Whether in the environmental or chemical sector as well as in the hygienic sector of the food, beverage, cosmetic and dairy industry, where liquids and products with highest viscosity are pumped.