Iwaki MDK Series Magnetic Drive Turbine Pumps

The Iwaki MDK series is a family of magnetically driven turbine pumps with an all-metal wetted end. The casing and casing cover are SCS14 cast stainless steel and the impeller is SUS316. The magnetic coupling removes the shaft seal and the leakage risk that comes with it. Mikron Proses (Üsküdar, Istanbul) supplies Iwaki MDK pumps in Turkey and provides application consulting on pump selection and liquid compatibility.

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Four models in one casing family

The series has four models, named after the pump bore: MDK-20, MDK-25, MDK-32 and MDK-40.

Model	Bore / connection	Flow rate, 50 Hz – 60 Hz (L/min)	Motor power (kW)	Maximum pressure (MPa)
MDK-20	20 mm (Rp3/4)	9 – 12.5	0.2	0.6
MDK-25	25 mm (Rp1)	12 – 18.5	0.37	0.6
MDK-32	32 mm (Rp1-1/4)	25 – 36	1.5	0.6
MDK-40	40 mm (Rp1-1/2)	30 – 60	4.0	0.8

The specific gravity limit is 1.3 for all models. In the model code (for example MDK-32 S6 TS EUR) the first number is the pump bore, S6 stands for the pump material (SCS14, SUS316, SUS329J1), TS for the check valve material (PTFE, SUS316) and EUR or EUR-R for the bearing material (carbon or PTFE).

Operating conditions and limits

According to the manufacturer’s manual, the pumped liquid temperature is 0-80 °C for water, and the manufacturer should be asked about the allowable temperature range for chemical liquids. The allowable ambient temperature is 0-40 °C and the allowable humidity 35-85% RH. The manual says not to install or store the pump where the ambient temperature is 0 °C or below, in corrosive or explosive gas environments, or in places where dew forms. Liquids that contain slurry (solids) cannot be pumped, and starting and stopping is limited to six times an hour or less. Dry running damages the bearings, so the pump must always be primed before it is started; the manual also recommends a dry-running protective device.

Where the MDK series fits

The all-metal wetted end makes the MDK series a candidate for process lines that call for a stainless steel casing and for closed-loop liquid transfer where a shaft seal could leak. Chemical compatibility and temperature limits depend on the liquid, so please discuss corrosive or special liquids with us before ordering.

For the other Iwaki process pump series, see the Iwaki magnetic-drive process pumps page. A related stainless steel turbine pump is the Iwaki MEK series.