Screw Pumps

Pump sets are available to meet the demands of your application and facility. Pump sets can range from very simple systems typically found on boiler loop applications to multi-generator systems involving backup features. Custom designed pump skids for heavier oils or other application requirements are also available upon request.

Screw Pump

Twin Screw Pumps

Twin Screw Pumps are self-priming, double ended positive displacement pumps with external timing gears and bearings. As the screws rotate, cavities are formed between the individual screws. These hold a given volume of fluid, moving it axially as the screws rotate. The portion of the fluid that enters the pump is diverted to the left or right and then moved forward from left to centre and from right to centre. At the centre the two flow paths re-join and leave the pump through the discharge flange. The screws do not mesh with each other. The drive to driven screw is transmitted by means of timing gears.

The design provides complete axial balancing of the rotating elements and eliminates all metal-to-metal contact within the pump. This feature makes them ideally suited for dry running and can also be operated at low rpm. They can handle all types of lubricating / non-lubricating abrasive & corrosive liquids with extremely low and high viscosity.

Triple Screw Pumps

Triple Screw Pumps are self-priming pumps with external or internal bearing, available in horizontal or vertical constructions. The pumping element of the Triple Screw Pumps consists of three screws, the main or drive screw and the two driven screws, which mesh together within the pump casing and form, transfer chambers. When turning the main screw the chambers move continuously and axially from the suction to the discharge side according to the pitch of the screws.

The volume of the several chambers is constant; hence a constant flow is obtained over the length of the pumping elements that also ensures of getting high suction lift. The resulting axial thrust during operation for the main screw is completely balanced. The driven screw is led by bearings or balancing bushes in the discharge area. Due to suction pressure in the seal housing, i.e., in front of compensating pistons and bushes, the pressure is balanced.

Triple Screw Pump

The screws are in contact with each other as well as with the surrounding casing. Subsequently, the medium must always have certain lubricating properties. The normal force between the component parts is directly proportional to the viscosity of medium. The maximum pressure, attained with such pumps, also depends directly on the corresponding viscosity.

The pumps are provided with an integral Relief Valve, which allows excess pressure to be re-circulated to suction chamber. Alternatively a Return Valve is provided which allows excess pressure to return to a separate tank.

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P.O. Box 1742
Umhlanga Rocks
Durban - South Africa

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Tel +27 (0)31 561 8002
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45 Hilken Drive
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Durban - South Africa

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CV21 3QL
Tel: 07875 844 743