The screw pumps are highly efficient, reliable, with robust drive seals and high-pressure capability. Screw pumps are used in all kinds of industry for conveying almost any fluid in a continuous, smooth manner with low pulsation, whilst maintaining the pressure ang for dosing in proportion to speed.

The pumps are used primarily for substances with the following properties:
• Consistencies from runny to pasty
• Substances with solid content
• Shear-sensitive
• Smearing or non-smearing
• Thixotropic and dilatant
• Abrasive - such as waste water, activated sludge, thin mud, fat and oil emulsions, kaolin slurries, mixed water, thickened sludge, etc.

A wide field of application

The pump is particularly suited for products with the following features:
● high content of solids (maximum size of up to 150 mm/6'') and free of solids
● low to high viscosity (1 mPa – 3 million mPas)
● thixotropic and dilatant
● shear-sensitive
● abrasive
● lubricating and non-lubricating
● aggressive (pH 0-14)
● adhesive
● toxic.

Technical features:

● Flow rates of only a few ml/h un to 500 m³/h
● Number of stages ranging from 1 un to 8 for pressures up to 48 bar
● High suction capability up to 9 mwc (30 ftwc)
● Reversible shaft rotation, i.e. direction of flow
● Installation in any position
● Temperatures of -20°C up to +300°C.

Various conveying elements

Four different rotor/stator geometries are available which allows optimisation of the pump characteristics for specific applications.

Extensive range of materials

For the various applications the metallic materials range from simple cast iron to nickel chromium steel up to highly acid-proof materials like Duplex, Hastelloy and Titanium. Elastomers like highly abrasion resistant natural rubber, oil-, acid- and alkali-proof elastomers, Aflas and Viton. Product for which elastomers cannot be used due to high temperatures and for wear reasons, there are variety of stators from solid materials, e.g. plastics and metal.

A wide variety of shaft seals

Mechanical shaft seals range from single-acting mechanical seals, with and without quench, to double-acting mechanical seals in back-to-back or tandem arrangement as well as cartridge seals as per customer specially designed seals. In the case of toxic fluid we offer a pump with a magnetic coupling which is 100% leakproof.

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