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A new approach makes flexible screw pumps

By Gerald Ondrey |

Leistritz Pumpen GmbH (Nuremberg, Germany; www.leistritz.com) has recently introduced Flexcore, the first screw pump capable of adapting to a wide range of installation situations. “With Flexcore, Leistritz has now created a globally groundbreaking innovation — a pump class that, for the first time, unites qualitative, functional and economic aspects in an extremely flexible, quickly available series product,” explains product manager Philipp Rossow.

“The cartridge unit of the Flexcore [cutaway diagram] is the heart of this pump,” says Rossow. Since the bearing is positioned on the outside, it is independent of the pumped medium. Therefore, the Flexcore is especially suitable for low-viscosity media. The seal installation space is designed for all common DIN-K mechanical seals.

The split Flexcore casing consists of a suction and pressure part and can be rotated four times by 90 deg (photo). The alignment of the optimum flange position makes the Flexcore extremely adaptable for installation — even in existing piping layouts. Depending on the application, different flange designs are possible: DIN, ASME or SAE. The easy-to-change cartridge technology allows the pump core to be replaced in just a few minutes, which simplifies maintenance and reduces downtime.

The pump features a fully hardened spindle package and a patented thrust-balancing system. The thrust-compensation system ensures the delivery of low viscosities, even at high pressures. For example, pressure differences of up to 10 bars can be achieved for viscosities of 1.1 centiStoke (cSt).

Initially, Leistritz is launching pump sizes for flowrates of 7–564 L/min. The series will successively be expanded by eight additional sizes with flowrates up to 1,600 L/min.

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