The rotating unit is made from Xytel ST801, a 'super tough' nylon, which is more resistant to abrasion than stainless steel, and runs at low speeds and under high pressure.

While conventional progressive cavity pumps generally have a rotating unit consisting of ten individual parts, the rotating unit in the MDP series is injection moulded as a single piece, which is less expensive than

'Super-tough' rotating unit conventional units and, according to manufacturer seepex, easier to maintain and much faster to replace.


The new MDP progressive cavity metering pumps provides pulse-free metering of low- to medium-viscosity fluids with repeatable accuracy up to ±1.0%. The pumps are available in four sizes with capacities from 0.1 to 580 l/h (2.5 gpm) and pressures to 12 bar (174 psi). They can be equipped with a specially designed electric motor with integrated frequency inverter and forced ventilation, or with mechanical variable speed drives. Speed can be controlled from 0 to 600 rpm by either a manual potentiometer or an external analogue signal.