The range of HNP positive-displacement internal gear pumps has been expanded to include 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, the company said.
These high-performance HNP pumps are suited to a range of liquids-transfer duties in chemical processing, pharmaceutical and industrial applications.
This includes: 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.
