The basis of any Progressive Cavity Single Screw Pump is a power section which usually consists of a metal rotor (n-start external helix) and a rubber stator (n+1-start internal helix). Rotation of the rotor inside the stator creates sealed cavities that progressively move from suction to discharge side of the pump producing differential pressure.

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As part of the project to upgrade water treatment facilities of one of the refinery plant in Russia, have been made BN021S02HYXVT pump units. They are intended for pumping of the collected oil.

These pumps are equipped by variators of friction type that allow mechanical control of flow rate of pumped liquid in the range of 0.05 to 0.15 m3 per hour, with a maximum pressure up to 7 bar.

Pump units have 1ExdIIBT4 explosion-proof electrical engines and protection from "dry run".