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The HNP range of positive-displacement internal gear pumps has been expanded to include new, larger pumps and more drive options to suit a wider range of applications.

Available from Michael Smith Engineers, the HNP 11500 Series provides a performance output of flows between 0.2 to 1150ml/min and differential pressures between 0-60 or 0-150 bar, depending on the viscosity of the process fluid.

Three motor options are available – AC, DC and an Atex-rated explosion-proof AC motor version, which is suitable for use in a hazardous areas.

Tungsten-carbide rotors and bearings, along with other hard construction materials such as ceramics, ensure long service life and wear resistance, even when transferring non-lubricating liquids.

Designed to deliver smooth, precise, pulseless flows (CV less than one per cent at low volumes) with high differential pressures, these rotary pumps feature an externally toothed internal rotor and an annular tooth external rotor.

These are slightly eccentric to each other and, during rotation of the rotors around their offset axis, the pumping chambers simultaneously increase on the suction side and decrease on the delivery side of the pump.

This results in a homogeneous flow rate being generated between the kidney-shaped inlet and outlet.

It is this design principle, combined with careful materials selection and high manufacturing precision, that facilitates the transfer of very low volumes with precise, smooth, pulseless flows.

These high-performance HNP pumps are suited to a range of liquid-transfer duties in chemical processing, pharmaceutical and industrial applications.

For example: pumping organic compounds in continuous processing systems in pharmaceuticals manufacturing, accurate pulseless small-capacity dosing of flavours and additives in food-processing equipment and precise, smooth filling of medical capsules.

Other potential applications include analytical instrumentation, sampling, robotics, fuel cells, particle and DNA analysis, biological-cell handling, ink-jet printing, minimum-quantity lubrication systems, aromatising and PCB cooling.

Michael Smith Engineers

Michael Smith Engineers Ltd,  the UK’s leading pump specialist for difficult liquid handling applications since 1971,  provide representation in the UK for specialist pump manufacturers, with particular emphasis on sealless leak free pump technology.  Our product range includes magnetically driven gear pumps, magnetically driven centrifugal pumps (including metal, plastic and lined centrifugals),  canned motor centrifugal pumps, peristaltic pumps, tubular diaphragm pumps, metering pumps, valveless piston pumps, turbine  pumps,  high pressure diaphragm pumps, vane pumps and barrel emptying pumps. We can supply pumps in a wide choice of wetted materials for liquids between 0.2 cP and 500,000 cP, temperatures between -50 oC and +400 oC,  capacities from nanolitres per hour to m3  per minute and can offer pumps for  high system pressures up to 350 Bar and high discharge pressures up to 500 Bar.  Corrosion resistant materials are available for many of our ranges include metallic options of stainless steel and high nickel alloys or plastic options of PVC,  polypropylene, PVDF and ETFE. The main markets we service with our ranges of pumps are the chemical, petrochemical, pharmaceutical and process sector with our larger pumps  as well as laboratories, research and development institutions and OEMs with our smaller pumps.  

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