Iwaki MX Series Magnetic Drive Chemical Process Pumps

Iwaki MX is a magnetic drive centrifugal pump with GFRPP wetted parts, used in chemical process lines. The seal-less design has no shaft seal. Mikron Proses provides selection, quotation and application consulting for Iwaki pumps, including the MX series.

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For stronger chemical resistance with CFRETFE wetted parts, see the Iwaki MX-F series; for a self-priming version, see the Iwaki SMX series. Other Iwaki magnetic-drive pumps are listed under Iwaki magnetic-drive process pumps.

The datasheet describes a patented self-radiating structure: heat-dispersion holes in the fixed portions of the impeller and the magnet capsule circulate the liquid around the spindle and bearing, which reduces sliding heat. Together with the non-contact principle and a spindle supported at the front and rear, it improves the pump’s ability to withstand some cavitation and operation against a closed discharge valve. The split-volute casing improves efficiency, and when the pump is fitted with a carbon bearing it allows brief periods of dry running.

Models and material options

The series is made in two groups, MX-70 and MX-100, and MX-250 to MX-505, in 11 model sizes in total. In the 70-100 group the casing is GFRPP and the impeller is CFRPP; in the 250-505 group the casing and impeller are GFRPP and the magnet capsule is PP. MX-402 to MX-505 have a lock pin that prevents unplugging. MX-402H and MX-403H are the higher-head models, with a lower flow at a higher head.

The bearing, spindle and O-ring combination is offered as CV/CE (carbon bearing with an alumina ceramic spindle, the option the datasheet links to brief dry-running tolerance), RV/RE (PTFE bearing with an alumina ceramic spindle) and AV/AE (alumina ceramic bearing and spindle). The O-ring is FKM or EPDM; with an AFLAS® O-ring the lower liquid temperature limit rises to 10 °C.

Model	Connection	Motor	Max. capacity
MX-70	G1 x G1	0.15 kW	90 L/min
MX-100	G1 x G1	0.26 kW	110 L/min
MX-250	G1 x G1	0.37 kW	150 L/min
MX-251	G1 x G1	0.75 kW	150 L/min
MX-400	G1½ x G1½	0.37 kW	280 L/min
MX-401	G1½ x G1½	0.75 kW	320 L/min
MX-402 / 402H	G2 x G1½	1.5 kW	450 / 160 L/min
MX-403 / 403H	G2 x G1½	2.2 kW	500 / 300 L/min
MX-505	65A x 50A	4.0 kW	800 L/min

Applications and options

The manufacturer recommends the MX series for production processes such as filtering, spraying, washing and etching in surface treatment processes. Because it has no shaft seal, it is also used in chemical transfer lines where leakage must be avoided.

An Iwaki DR-20 current-sensing dry-running protector is available as an option (380-440 V three-phase motors, 0.75-15 kW motor range). It detects a low load current and stops the pump on dry running, air suction, operation with the suction side closed or overload.

The performance data are based on clear water, and the pump model is chosen for the required flow, head and specific gravity of the liquid. The standard duty points (L/min at m) are 50 at 5.4 (MX-70), 70 at 6 (MX-100), 80 at 19 (MX-251), 150 at 14.5 (MX-401), 200 at 20 (MX-402), 250 at 23 (MX-403), 100 at 30 (MX-402H), 100 at 35 (MX-403H) and 500 at 24.5 (MX-505).