Iwaki America, the world leader in small magnetically coupled centrifugal
pump technology, offers the premier line of non-metallic centrifugal pumps.
Extraordinarily high efficiencies make WMD & MD the clear choice in almost every
process, recirculation or transfer application. Iwaki America pumps are
compact, offer higher pressure, AND last longer than any traditional
offerings. Motor Matching - Offering more motor/pump configurations than any
other manufacturer easily allows tailored pump applications. Premium, high
efficiency motors are used throughout the line. Totally enclosed, permanent
split capacitor motors are compact, cool and economical. Tolerance to voltage
variation without overheating and 50/60 Hz operation allows the product to be
used in a worldwide market.
Unique internal cooling circuit - Hollow rotating spindle creates a positive,
forced cooling path, lubricating bearing surfaces and actively purging gases &
heat. Fluid is not trapped in the rear casing but seeks a low pressure escape to
the eye of the impeller through the hollow spindle. Frictional heat is conducted
out of the rotating element. Any gas/air is sucked from the rear casing and
expelled in a perpetual cycle.
• Unique double bearing system allows the cooling circuit liquid to continually
“wash” front and rear radial bearings, extending bearing life.
• Inner rotating assembly - The impeller/magnet, keyed off this machined
center, is integrally molded
with this assembly for perfect concentricity and complete encapsulation of the
driven magnet element. In the final step, two precision ground ceramic thrust
rings are press-fitted in perfect parallel alignment onto the front and rear of
the rotating assembly.
Substantially reduced hydraulic noise is a major feature of all WMD/MD
impellers. Great pains are taken in the molding/finishing
process to eliminate tangential misalignment. Hardened and plated mold surfaces
yield smooth, uniform parts.
• Balance holes designed to minimize axial thrust are incorporated into the WMD/MD
impellers. Traditionally employed only in
large process pumps, balance holes are yet another performance detail
characteristic of Iwaki America WMD/MD pump
engineering.
Pump Specifications:
| Model |
Connections Tube-NPT(inches) |
Motor Output(HP) |
Max Amps |
Max Flow(GHP) |
Max Head(FT) |
Dimensions(WxHxL) |
Weight(LBS) |
| WMD-15RLT |
1/2-1/2 |
1/75 |
0.8 |
300 |
11.1 |
3.5x4.26x9.46 |
6 |
| WMD-20RLT |
5/8-3/4 |
1/38 |
0.5 |
492 |
14.1 |
3.5x4.35x9.7 |
7 |
| WMD-20RLXT |
1-1 |
1/38 |
0.5 |
822 |
8.2 |
3.5x4.95x10.37 |
7 |
| WMD-30RLT |
3/4-3/4 |
1/16 |
1.0 |
600 |
17.7 |
3.5x4.7x11.65 |
9 |
| WMD-30RLXT |
1-1 |
1/16 |
1.0 |
1140 |
13.5 |
3.5x5.09x11.89 |
9 |
| WMD-40RLT |
3/4-3/4 |
1/12 |
1.9 |
822 |
21.3 |
4.38x4.84x11.34 |
10 |
| WMD-40RLXT |
1-1 |
1/12 |
1.9 |
1344 |
15.4 |
4.38x5.23x11.30 |
10 |
Flow charts can be found
HERE! (Link will take you to Iwaki's website)
Q&A:
Can I run these pumps dry?
No, No, No, Never. These pumps rely upon a liquid medium to lubricate the
internal bearings. Without
fluid in the liquid end, the ceramic and plastic parts rub together while
rotating 3000 times a minute.
Within a matter of minutes you will cause severe damage to your pump.
What is the difference between MD and WMD?
MD stands for Mag-Drive. WMD stands for Walchem Mag-Drive. In an effort to lower
the cost of the MD
pump that uses a Japanese motor, Walchem developed the WMD series. The Japanese
motor and cast
aluminum adapter bracket were replaced by a domestic (Fasco) motor and a
polypropylene adapter
bracket. A WMD will match the Hydraulics for the MD series but will typically be
a little bit longer in length.
How long will my pump last?
This question is the equivalent of "How long will you live?" There are many
factors that decide both of
these questions including care, work performed and accidents. We do warranty our
pumps for one year,
parts and workmanship. Typically, a MD/WMD pump in an aquarium application will
last three to four
years. Many of our customers enjoy 5+ years of service. Visit our web-site for
customer testimonials.
Do you offer a submersible pump?
No. None of our MD/WMD pumps can be submersed.
My pump seems to be running hot?
The WMD series runs slightly hotter than the MD series. A rule of thumb is that
the pump should be
moderately hot to the touch but you should be able to hold your hand on it for
about 3 seconds. All
MD/WMD pumps are thermally protected to shut off in the unlikely event the pump
reaches a critical
temperature. Once cooled, the pump will restart automatically.
What are the materials in contact with the fluid?
For the MD/WMD series the liquid end is glass filled polypropylene including an
encapsulated inner
magnet. The spindle is alumina ceramic and the bearings are Rulon (a
fluoroplastic/ carbon mix).
Can the pump pass solids such as rocks, sand and dirt?
The pump is limited in its solids handling to objects about the diameter of a
human hair. In general, that is
a fine sand or silt like material. Solids should never exceed 5% by volume in
your water. Excessive solid
will wear the pump’s bearings over time and cause premature failures.
What type of motors do you use and can I buy them elsewhere?
For our MD-6 through (W)MD-30 series, the motor type is Totally Enclosed
Non-Ventilated (TENV). For
our (W)MD-40 and above, the motor is Totally Enclosed Fan Cooled (TEFC). We
custom manufacture all
of these motors so they are specific to our product only. You can not purchase
them elsewhere.
What is the minimum flow of the pump?
For pumps with a flow rating up to 10 GPM we recommend ¼ GPM. Pumps with a flow
over 10 GPM we
recommend ½ GPM. Keep in mind that the lower the flows through the liquid end
the more heat that will
be transmitted into the fluid from the bearings.
Can I mount these pumps vertically?
We recommend horizontal mounting but vertical mounting can be utilized up to
size 40. A heads up
position is preferred. Always be sure that flooded suction conditions exist when
mounting the pump
vertically.
Can I use these pumps outdoors?
Yes. We recommend that they be enclosed in a vented cabinet since the motors are
not washdown duty
and should not be exposed to rain. Keep in mind that if the fluid freezes within
the pump it can crack the
plastic components easily.
