Pumps for Sensitive and Difficult Fluids

04.06.2004

Increasingly, liquids transfer applications demand pumps which offer optimum reliability and durability, even when the process may involve highly corrosive or aggressive media.

To meet these demands, ASV Stuebbe offers a range of end-suction horizontal centrifugal pumps, the bareshaft or long coupled type NM and the close coupled NMB, which are machined from solid blocks of pure thermoplastic. As a result of this method of construction, the stresses sometimes associated with other types of pumps which are moulded, rather than machined from similar materials, are eliminated.

Available in the UK through PUMP ENGINEERING, these thermoplastic centrifugal pumps incorporate a minimum of moving parts and this, combined with their casing material, provides excellent corrosive and abrasive resistance along with optimum operational reliability.

In addition to their suitability to handling 'difficult' media, ASV pumps are also suited to applications which involve 'critical' fluids. For example, in the fine chemical industries, such as biotechnology, pharmaceuticals and semi-conductor production where particularly high demands are placed on the purity of pumps.

In order to convey fluids which come into contact with silicon wafers during the manufacture of semiconductors, only metal-free pumps such as the NM and NMB types made of very pure plastics like Polypropylene or PVDF, are usually considered ASV type NM and NMB pumps are available as Din standard and magnetic drive, horizontal and vertical centrifugal options, with flow rates up to a maximum of 500 m3 /hour at heads up to 100 metres. They can be supplied in materials such as; PE, PP, PVDF and UHMW-PE, while a self-priming eccentric rotor pump option is available for applications involving low flows.

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