Iwaki MDM Series Dry-Run Resistant Magnetic Drive Pumps

The Iwaki MDM series is a magnetic drive process pump with fluororesin wetted parts and a patented “non-contact” mechanism that improves resistance to dry running. High-power rare earth magnets keep the magnet capsule from touching the rear casing thrust ring, which prevents the fluororesin from melting through frictional heat. This protection applies only to the CF type (high-density carbon bearing); dry running is not permitted with the KK type. Mikron Proses (Üsküdar, Istanbul) supplies Iwaki MDM pumps in Turkey and provides application consulting on pump size and material selection.

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Model family and performance

The series is built on four pump sizes: MDM25 (40 × 25 mm, three impeller ranges), MDM32 (50 × 32 mm, two impeller ranges), MDM40 (65 × 40 mm) and MDM50 (80 × 50 mm). In the 50 Hz catalogue table the maximum head is 74.0 m (MDM25-3, 225 mm impeller, 2-pole motor) and the maximum capacity is 833 L/min (MDM50-1). Motor options run from 1.5 kW to 15 kW with 2-pole motors and from 1.5 kW to 5.5 kW with 4-pole motors.

Materials, standard and strength

There are two wetted material options: CFRETFE (ECF and EKK types, -20 to 105 °C) and PFA (PKK type, -20 to 150 °C; NKK type, -20 to 120 °C). The outer casing is reinforced with ductile cast iron, and the rear casing is supported by a fibre reinforced plastic cover, which also prevents sparks if the rear casing touches the drive magnet. The back pullout design allows internal inspection and part replacement without removing the piping. The standard maximum casing pressure is 1.0 MPa; for the MDM25-3, the MDM32-2 and the long coupling type it is 1.6 MPa. The pump has a common base compliant with ISO 2858 / DIN EN22858 in regard to piping connection.

Where the MDM series is used

The manufacturer describes applications from acid to alkali duties and high-purity chemicals for the semiconductor industry; natural PFA generates fewer contaminants than filled materials. The non-contact system is aimed at lines where dry running or abnormal conditions such as cavitation or air entering the pump may occur. Chemical compatibility depends on the liquid, concentration and temperature, so please check your duty with us before ordering.

For the long coupling version of the same family, see the Iwaki MDM NP series. For the other Iwaki process pump series, see the Iwaki magnetic-drive process pumps page.