n
6
3. Maximum system pressure rating
The table on the right shows the maximum
pressure rating of each model. Take care
that the system pressure does not exceed the
maximum pressure rating.
4. Handling of slurries
In general, slurries should not be handled. However, the MDH-F(AV) models or custom order
models with SiC bearings (KK type) can handle slurries if the density is 5% or less and the grain size
is 2 mil (50 micron) or less. Prior to pumping such slurry liquid, you should call Iwaki Walchem or
your distributor to verify that the operation is feasible.
5. Influence of specific gravity on pump performance.
The performance of the MDH-(F) pumps does not change when pumping fluids of high specific
gravity. However, the effect of specific gravity on shaft power and magnet coupling torque require-
ments must be considered in the selection of the appropriate model for your application.
6. Influence of liquid viscosity on pump performance.
When pumping a high viscosity liquid, the discharge head and capacity of the pump may be lower
than in the case of pure water. The required driving power may also vary and should be checked.
7. Intermittent operation.
Frequent start/stop switching shortens the service life of the pump. Limit the frequency of switching
to six times or less per hour.
8. Effects of temperature.
The pump itself may not suffer a change in performance due to temperature fluctuation. However, the
liquid may change in terms of viscosity, vapor pressure, and corrosive properties. Pay special attention
to changes in liquid characteristics as a result of temperature fluctuation.
Liquid temperature range:
32 - 176° F (0 - 80°C)
Ambient temperature range: 32 - 104° F (0 - 40°C)
* Refer to corrosion resistance tables for the recommended temperature range for various types of
liquids. In case of any questions, contact Iwaki Walchem or your local distributor to determine if
operation is feasible.
9. Separation of magnet coupling (Decoupling).
If the magnet coupling should disconnect, stop the pump immediately. If operation is continued, the
torque rating of the coupling will be permanently reduced.
Max. Pressure Rating
Pump Size
PSI
kgf/cm
2
400
23
1.6
401
34
2.4
422
43
3.0
423
43
3.0
425
57
4.0
