Progressing Cavity Pumps
A progressing cavity pump also called progressive cavity pump or eccentric screw pump is a type of positive displacement 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 (bidirectional) and to low level of shearing being applied to the pumped fluid. Hence these pumps have application in fluid metering and pumping of viscous or shear sensitive materials. The cavities taper down towards their ends and overlap with their neighbours, so that in general no flow pulsing is caused by the arrival of cavities at the outlet. Progressing cavity pumps are ideal for handling of thick, highly viscous and/or abrasive fluids like sludges, liquid manure, crude oil and fats.
As is common in engineering these pumps are often referred to by using a trademark e.g. Moineau (after the inventor René Moineau), Monopump, Moynopump, Mohnopump. (taken from Wikipedia)
Eccentric Screw Pumps (MAN/MAE)
The stator made of an elastomer encloses the metallic rotor tightly. Therefore the pump has an excellent priming capability. The discharge pressure corresponds to the length of the stator-rotor-unit.
Pumps are made of stainless 304 or 316 with stators of NBR and rotors of stainless steel. Special applications will require other elastomers and coated rotors. Product connections are available to comply with all hygienic standards. Accessories for handling of difficult products can be attached like: hoppers with feeding screw(s), paddles to split-up accumulated product particles etc. Shaft seals may be packing rings or mechanical seals. The series MAN has its own bearing stool which is connected to the driver by a flexible coupling.
Application: foodstuff, cosmetics, beverage industry and enology.
