Iwaki MDW Series Large Fluoroplastic Magnetic Drive Pumps

The Iwaki MDW series is a large-capacity magnetic drive process pump with ETFE and PFA wetted parts. The catalogue gives a maximum flow capacity of 300 m³/h and a maximum discharge head of 98 m. The magnetic drive removes the shaft seal. Mikron Proses (Üsküdar, Istanbul) supplies Iwaki MDW pumps in Turkey and provides application consulting on pump selection and materials.

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High flow and high head

The catalogue describes the pump as capable of previously unexplored applications across a wide range of liquid specific gravities. The series has three models, grouped by pump bore. The table shows the duty points listed in the catalogue.

Model	Suction × discharge (mm)	Impeller size (mm)	Capacity (L/min / m³/h)	Head (m)	Poles	Motor output (kW)
MDW50	80 × 50	250	833 / 50	83	2P	22, 30, 37, 45, 55, 75
		260	417 / 25	21.5	4P	11, 15, 18.5, 22, 30, 37
MDW80	125 × 80	250	2,667 / 160	90	2P	37, 45, 55, 75
		255	1,333 / 80	23	4P	11, 15, 18.5, 22, 30, 37
MDW100	125 × 100	200	3,333 / 200	62	2P	37, 45, 55, 75
		235	1,667 / 100	21.5	4P	11, 15, 18.5, 22, 30, 37

The maximum operating pressure is 1.6 MPa for all models. Liquid temperature is -10 to 105 °C for the ETFE type and -10 to 120 °C for the PFA type; the catalogue advises watching for dew condensation on the pump in low-temperature use. Dimensions comply with ISO 2858 and 3661, so the pumps are interchangeable with conventional sealed centrifugal pumps.

Flange-connection motor option

The catalogue lists a flange-connection type (MDW-F, flange motor or foot mounted flange motor) next to the foot mounted motor coupling type (MDW-C). According to the manufacturer, the flange-connection type reduces installation space and improves maintainability. The back pullout system allows maintenance and inspection without removing pipework, and the integrated components and the sealed rear casing support structure allow the motor to be removed safely without chemical leakage.

Construction

The pump is armoured with high-strength ductile cast iron. The rear casing has a design that prevents stress concentration and a triple-layer structure (patented), and a special metal shaft is used to withstand high radial forces. Bearing and sleeve are SiC, the gasket is PTFE and the O-ring is Kalrez®, FKM or EPDM. The front casing and impeller are PFA on the MDW50 and ETFE and CFRETFE on the MDW80 and MDW100; the rear casing and split plate are PFA.

Where the MDW series is used

Applications named in the catalogue are chemical transfer between supply tanks and through chemical process equipment, chemical recirculation for filtration and heat exchange, scrubber liquid recirculation and replacement of conventional sealed pumps. Chemical compatibility depends on the liquid, concentration and temperature, so please check your duty with us before ordering.

For the other Iwaki process pump series, see the Iwaki magnetic-drive process pumps page.