IWAKI MDK Series User manual

Read this manual before use of product
Instruction Manual (Europe Edition)
IWAKI Magnetic Drive Pump
MDK Series
T511-2 '17/04
http://www.iwakipumps.jp
IWAKI CO.,LTD. 6-6 Kanda-Sudacho 2-chome Chiyoda-ku Tokyo 101-8558 Japan
TEL: [phone] FAX: [phone]
European ofce / IWAKI Europe GmbH
TEL: [phone] FAX: [phone]
Norway / IWAKI Norge AS
TEL: [phone] FAX: [phone]
Australia / IWAKI Pumps Australia Pty Ltd.
TEL: [phone] FAX: [phone]
Germany / IWAKI Europe GmbH
TEL: [phone] FAX: [phone]
Sweden / IWAKI Sverige AB
TEL: [phone] FAX: [phone]
China (Hong Kong) / IWAKI Pumps Co., Ltd.
TEL: [phone] FAX: [phone]
Holland / IWAKI Europe GmbH (Netherlands Branch)
TEL: [phone] FAX: [phone]
U.K. / IWAKI Pumps (U.K.) LTD.
TEL: [phone] FAX: [phone]
China (Guangzhou) / GFTZ IWAKI Engineering & Trading Co., Ltd.
TEL: [phone] FAX: [phone]
Italy / IWAKI Europe GmbH (Italy Branch)
TEL: [phone] FAX: [phone]
U.S.A. / IWAKI America Inc.
TEL: [phone] FAX: [phone]
China / IWAKI Pumps (Shanghai) Co., Ltd.
TEL: [phone] FAX: [phone]
Spain / IWAKI Europe GmbH (Spain Branch)
TEL: [phone] FAX: [phone]
Argentina / IWAKI America Inc. (Argentina Branch)
TEL: [phone]
Korea / IWAKI Korea Co., Ltd.
TEL: [phone] FAX: [phone]
Belgium / IWAKI Belgium N.V.
TEL: [phone] FAX: FAX: [phone]
Singapore / IWAKI Singapore Pte Ltd.
TEL: [phone] FAX: [phone]
Taiwan / IWAKI Pumps Taiwan Co., Ltd.
TEL: [phone] FAX: [phone]
Denmark / IWAKI Nordic A/S
TEL: [phone] FAX: [phone]
Indonesia / IWAKI Singapore (Indonesia Branch)
TEL: [phone] FAX: [phone]
Thailand / IWAKI (Thailand) Co., Ltd.
TEL: [phone] FAX: [phone]
Finland / IWAKI Suomi Oy
TEL: [phone] FAX: [phone]
Malaysia / IWAKIm SDN. BHD.
TEL: [phone] FAX: [phone]
Vietnam / IWAKI Pumps Vietnam Co., Ltd.
TEL: [phone] FAX: [phone]
France / IWAKI France S.A.
TEL: [phone] FAX: [phone]

Thank you for selecting IWAKI Magnetic Drive Pump MDK Series. This instruction manual,
which is divided into five sections, namely "Safety", "Outline of Product", "Installation",
"Operation" and "Maintenance", deals with the correct handling and operation procedures for
the pump. To make maximum use of the pump and to ensure safe and long time operation of
the pump, please read this manual thoroughly and carefully prior to operating the pump.
Contents
Safety section ............................................................................. 1~4
Outline of product ...................................................................... 5~9
1. Unpacking and inspection ..................................................... 6
2. Operating principle ................................................................ 6
3. Model identification ................................................................ 6
4. Specification
.......................................................................... 7
5. Construction and material ..................................................... 7
6. Outline dimension .................................................................. 8
7. Performance curve ................................................................ 8
8. Construction and parts names .............................................. 9
Installation ................................................................................10~16
1. Precautions before use of pump ......................................... 11
2. Plumbing
............................................................................. 14
3. Electrical wiring ................................................................... 16
Operation ................................................................................. 17~19
1. Precautions on operation .................................................... 18
2. Preparation for operation ..................................................... 18
3. Operation
............................................................................. 19
4. To stop pump ....................................................................... 19
Maintenance ............................................................................ 20~27
1. Troubleshooting
................................................................... 21
2. Maintenance and inspection ................................................ 22
3. Consumable parts ............................................................... 24
4. Disassembling and assembling ........................................... 25

- 1 -
Safety section
Nonobservance or misapplication of “Caution” sec-
tions could lead to personal injury or property dam-
age.
For the Safe and
Correct Handling of the Pump
●"Safety Instruction" section deals with important details about handling of the product. Before
use, read this section carefully for the prevention of personal injury or property damage.
●Observe the instructions accompanied with "WARNING" or "CAUTION" in this manual. These
instructions are very important for protecting users from hazardous situations.
●The symbols on this instruction manual have the following meanings:
WARNING
Nonobservance or misapplication of “Warning” sec-
tions could lead to a serious accident which may
result in death.
CAUTION
Types of Symbols
Indicates that “Warning” or “Caution” must be exercised. Inside this triangle, a con-
crete and practical image provided as a warning or caution message is depicted.
Indicates a prohibited action or procedure. Inside or near this circle, a concrete and
practical image of the activity to be avoided is depicted.
Indicates an important action or procedure which must be performed or carried out
without fail. Failure to follow the instructions herein can lead to malfunction or
damage to the pump.
Export Restrictions
Technical information contained in this instruction manual might be treated as controlled
technology in your countries, due to agreements in international regime for export control.
Please be reminded that export license/permission could be required when this manual is
provided, due to export control regulations of your country.

- 2 -
Safety section
WARNING
● Turn off power before service
Risk of electrical shock. Be sure to turn off power to stop the pump and
related devices before service is performed.
● Wear protective clothing
Always wear protective clothing such as an eye protection, chemical re-
sistant gloves, a mask and a face shield during disassembly, assembly or
maintenance work. The specic solution will dictate the degree of protec-
tion. Refer to MSDS precautions from the solution supplier.
● Use strong ropes (chains) for lifting up the pump
Serious injury may result if lifting ropes (chains) break. Check lifting ropes
(chains) are strong enough before use. Observe the maximum weight.
● Do not modify the pump
Alterations to the pump carries a high degree of risk. It is not the manufactur-
er’s responsibility for any failure or injury resulting from alterations to the pump.
● Access limitation
The magnet drive pump has a pair of strong magnets. The strong magnet
field could adversely affect the persons who are assisted by electronic
devices such as the pacemaker.
● Stop operation
If you notice any abnormal or dangerous conditions, suspend operation
immediately and inspect/solve problems.
● When handling hazardous liquid
For handling harmful liquids as mentioned below, be sure to conduct daily
inspection and maintenance for the prevention of liquid leakage. Otherwise
personal injury, explosion or fire may result.
1. Explosive or flammable liquid
2. Corrosive or stimulus toxic liquid
3. Health hazardous liquid
● Do not catch the finger
Magnetic force of the pump is powerful. Take care not to catch the finger in
the bracket.
Turning off power
Prohibited
Wear protective
gear
No Remodeling
Caution
Prohibited

- 3 -
Safety section
CAUTION
● Qualified personnel only
The pump should be handled or operated by qualified personnel with a full
understanding of the pump. Any person not familiar with the product should
not take part in the operation or management of the pump.
● Do not use the pump in any condition other than its intended purpose
The use of the pump in any conditions other than those clearly specied
may result in failure or injury. Use this product in specied conditions only.
● Use specified power only
Do not apply power other than that specied on the nameplate. Otherwise,
failure or re may result. Ensure the pump is properly grounded.
● Ventilation
Fumes or vapours can be hazardous with certain solutions. Ensure proper
ventilation at the operation site.
●Spill precautions
Ensure protection and containment of solution in the event of plumbing or
pump damage (secondary containment).
● Do not run pump dry
Do not run pump dry (Operation without liquid). Friction heart builds up dur-
ing dry running operation and damages internal parts. If the pump is oper-
ated with a suction side valve closed or without priming, the pump runs dry.
● Do not operate the pump in a flammable atmosphere
Do not place explosive or ammable material near the pump.
● Do not stand on the pump
Do not use the pump as a platform. Injury or damage may result when the
pump turns over.
● Do not touch the pump or pipe with bare hands
Risk of burning. The surface temperature of the pump or pipe rises high
along with liquid temperature in or right after operation.
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Caution

- 4 -
Safety section
CAUTION
● Grounding
Risk of electric shock! Always properly ground the pump. Conform to local
electric codes.
● Install a GFCI (earth leakage breaker)
An electrical failure of the pump may adversely affect other devices on the
same line. Purchase and install an earth leakage breaker separately.
●Do not install/store the pump:
• In a ammable/explosive/corrosive atmosphere.
• In a dusty/humid environment.
• Where ambient temperature can exceed 0-40°C.
• Under mechanical vibrations.
• In direct sunlight or wind & rain.
● Starting
The pump doesn’t have an ON-OFF switch. The pump starts as a power
cable is plugged in.
● Foreign matter
When foreign matters enter the pump, turn off power at once and remove
them. Using the pump with foreign matters may result in failure.
●Disposal of a used pump
Dispose of any used or damaged pump in accordance with local rules and reg-
ulations. If necessary, consult a licensed industrial waste disposal company.
● Static electricity
When low electric conductivity liquids such as ultra-pure water and fluor
inactive liquid (e.g. FluorinertTM) are handled, static electricity may generate
in the pump and may cause static discharge. Take countermeasures to
remove static electricity.
●Preventative maintenance
Follow instructions in this manual for replacement of wear parts. Do not
disassemble the pump beyond the extent of the instructions.
●Do not use a damaged pump
Use of a damaged pump could lead to an electric shock or death.
Caution
Grounding
Electrical shock
Prohibited
Caution
Prohibited

OUTLINE OF PRODUCT
1. Unpacking and inspection .................. 6
2. Operating principle ............................. 6
3. Model identification ............................. 6
4. Specification ....................................... 7
5. Construction and material ................... 7
6. Outline dimension ............................... 8
7. Performance curve ............................. 8
8. Construction and parts names ............ 9
- 5 -

- 6 -
1. Unpacking and inspection
After the product is unpacked, check followings.
1) Identify the product
Check nameplate if pump model, head, frequency,
discharge capacity, motor power, voltage etc. are correct.
2) Damage during transportation
Check if the product is not damaged and bolts and nuts
are not loosened during transportation.
3) Discharge and suction ports are plugged so that foreign
matters do not get into pump chamber. Remove the plug
when the product is installed.
2. Operating principle
MDK Series pumps are magnetically driven turbine pump.
Impeller is rotated in pump chamber by the magnetic
coupling force to suck liquid from suction port and to
discharge to outlet.
3. Model identification
MDK ‒ 32 S6 TS EUR
(1) (2) (3) (4)
(1) Pump bore : 20 ... 20mm, 25 ... 25mm, 32 ... 32mm, 40 ...40mm
(2) Pump material : S6 ... SCS14, SUS316, SUS329J1
(3) Check valve material : TS ... PTFE, SUS316
(4) Bearing material : EUR ... Carbon
EUR-R ... PTFE

- 7 -
4. Specification
Model Bore Standard flow rate (L/min.) Specific
gravity limit
Motor
power (kW)
50Hz 60Hz
MDK-20 20mm
(Rp3/4) 9 - 10 12 - 12.5 1.3 0.2
MDK-32 32mm
(Rp1-1/4) 25 - 29 30 - 36 1.3 1.5
MDK-40 40mm
(Rp1-1/2) 30 - 45 40 - 60 1.3 4.0
MDK-25 25mm
(Rp1) 12 - 15 16 - 18.5 1.3 0.37
5. Construction and material
■Wet end material
Parts Material
Casing SCS14
Casing cover
Impeller SUS316
Magnet capsule unit SUS329J1 + SUS316
Thrust washer PTFE
Bearing set Carbon/SCS14,SUS316 or
PTFE/SCS14,SUS316
Cover packing PTFE
Check valve PTFE/SUS316
■ Pump weight with no motor
MDK-20 MDK-25 MDK-32 MDK-40
15kg 20kg 25kg 50kg

- 8 -
6. Outline dimension
Model WH a b c d e f g h i j k m n
MDK-20
180
260 140
30
80 44
150 90 95 75 50 209 90 (Rc3/4)
MDK-25 267 200 140 50 100 77 63 228 96 (Rc1)
MDK-32 317 235 175 46 110 110 97 68 234 90 (Rc1-1/4)
MDK-40 270 362 310 20 270 44 230 135 130 70 269 110 (Rc1-1/2)
l
20
27
40
45
7. Performance curves

- 9 -
8. Construction and parts names
The drawing shows every composing parts. Disassembling of pump must be limited to the extent shown on
"Maintenance" section.
No. Parts Q'ty Material Remarks
MDK-20 MDK-25 MDK-32 MDK-40
1 Front casing 1 SCS14
3 Magnet capsule 1 SUS316/SUS329J1
8 Hex. socket head bolt 4 Stainless steel M6 × 12 M8 × 16
9 Rear casing 1 SUS316
10 Packing 1 PTFE
11 Hex. socket head bolt 4 Stainless steel M6 × 12 M8 × 16
12 O ring 1 PTFE
13 Key 1 SUS316
14 Impeller 1 SUS316
15 Casing cover 1 SCS14
16 Gasket 5 PTFE
17 Hex. head bolt 6 Stainless steel M8 × 16
18 Priming plug 1 SUS316 Rp 3/8"
19 Gasket 1 PTFE
20 Air vent plug 1 SUS316 Rp 1/8"
21 Drain plug 1 SUS316 Rp 1/8"
22 Suction flange 1 SCS14 Rp3/4" Rp1" Rp1-1/4" Rp1-1/2"
23 Check valve 1 PTFE/SUS316
24 Hex. head bolt 4 Stainless steel M12 × 30
25 Discharge flange 1 SCS14 Rp3/4"
26 Flange gasket 1 PTFE
27 Hex. head bolt 4 Stainless steel M12 × 45
28 Hex. nut 4 Stainless steel M12
32 Drive magnet 1 SS400
33 Bracket 1 FC150
36 Motor 1
37 Thrust washer 2 PTFE
54 Hex. socket head bolt 4 SUS316 M6 × 12 M8 × 16
101 Bearing housing set B 1 Carbon/SUS316 or PTFE/
SUS316
102 Bearing housing set A 1 Carbon/ SCS14 or PTFE/
SCS14
Rp1" Rp1-1/4" Rp1-1/2"
M12 × 50

INSTALLATION
1. Precautions before use of pump ... 11~12
2. Plumbing .............................................. 14
3. Electrical wiring .................................... 16
- 10 -

- 11 -
1. Precautions before use of pump
1) Precautions when pump is started or stopped
To avoid water hammer phenomenon, pay attention to followings when pump is started or stopped. Especially, pay
special attention in case discharge piping is long.
(1) When pump is started
After pump is primed, open the discharge valve and then turn on power to start pump. After pump starts,
gradually close the valve to get desired duty point.
(2) When pump is stopped
When pump is stopped, close the discharge valve gradually to go to minimum flow and then turn off power. The
discharge valve must be closed completely after the pump stopped.
Never close the flow suddenly by solenoid valve or so. Sudden shut-down may cause excessive pressure
increase resulting in pump damage.
2) Do not install nor store pump at following places
 ●Placeswhereambienttemperaturebecomeszerodeg.Corbelow.
 ●Corrosiveorexplosivegasenvironment
 ●Placeswheredewdrops
 ●Ambienttemperaturemorethan40deg.C
 ●Highhumidplace(Allowablehumidityis35to85%RH.)
 ●Dustyplaceorplaceinfluencedbyexternalshockorvibration
Caution
● Do not run pump dry
When you operate pump first time after the installation or after repair works, prime the
pump to start. Dry running (running with no liquid) will cause the seizure of rubbing
parts resulting in pump failure.
Running parts are self-lubricated and cooled by pumped liquid. Dry running or running
with valve closed will damage the impeller because the automatic balancing mecha-
nism does not work.
● If pump runs dry by mistake, turn off power and leave it for one more than one hour
without pouring liquid into pump.
● Dry running protective device is recommended to avoid dry running.
● Keep pump away from fire
For your safety, do not put dangerous or flammable substance near to pump.
● Do not use pump for transferring dangerous liquids mentioned as below.
Explosive and flammable liquids
Corrosive and irritating odor toxic liquid
● Do not remodel pump
Remodeled pump may cause accident, electrical shock or pump failure.
Do not remodel pump.
Prohibited
Prohibited
Prohibited
Prohibited

- 12 -
3) Prime pump
Both air-liquid separation tank located top part of pump body and pump chamber must be primed. Before start pump,
fill them with liquid. Dry running (pump operation without liquid) may cause pump seizure or shortened pump parts.
4) Max. pressure limit of pump
Max. pressure limit of pump is 0.6MPa for MDK-20,25 and 32, and 0.8MPa for MDK-40.
5) Pumped liquid
1) Slurry liquid
Liquid which contains slurry (solid substance) can not be pumped.
2) Performance influenced by specific gravity and viscosity of pumped liquid
In case handled liquid is heavier and more viscous than water, the shaft power , discharge capacity and head are
not the same as pumping water. The pump is made according to the information given to us when we received
order from you. If you change the liquid or operating condition, please consult us to confirm if the pump can be
used for the changed liquid or conditions.
3) Change of temperature of pumped liquid
Pump performance is not influenced by the change of temperature of pumped liquid but the temperature change of
pumped liquid influences viscosity, vapor pressure and corrosiveness of liquid. Pay attention to the change of
characteristics of pumped liquid.
● Pumped liquid temperature range : 0 - 80 deg.C (in case of water)
● Allowable ambient temperature range: 0 - 40 deg.C
● Allowable humidity range : 35 - 85% RH
Ask us for the allowable liquid temperature range of chemical liquids.
6) Dimension of bearing
Radial direction wear limit of bearing is 2 mm. Temperature rise value of bearing in standard performance range is s3
deg. C or less.
7) Intermittent operation
So often repeated pump starting and stopping cause pump damage. Starting and stopping pump is limited to six times
or less an hour.
8) Dislocated magnet coupling
When the magnet coupling is dislocated, stop the pump within a minute. If pump runs with magnet coupling
disconnected, the coupling force is reduced.
9) Installation space
Select a level location, free from vibration, that won't hold liquid.
Allow sufficient space around the pump for easy access and maintenance.

- 13 -
Example of recommended plumbing
(1) Discharge pipe
(Install pipe support so that piping load
can not be put on pump.)
(2) Gate valve
(3) Check valve
(4) Pressure gauge
(5) Motor
(6) Pump
(7) Priming pipe, air vent
(8) Strainer
(9) Drainage ditch
(10) Compound gauge
(11)Suction pipe (Pipe dia.: D)
(Horizontal part is as short as possible
and take an ascending inclination
approx. 1/100 towards pump.)
(12) Pipe support
(13) Pump drain
(14) Suction pipe (Pipe dia. : D)
(15) 2D or more than 500mm
(16) Expansion joint
(17) Flushing piping (Discharge side)
(18) Flushing piping (Suction side)
(19) Screen
(20) More than 1.5D
(21) 2D or more than 500mm
(22) More than 1.5D
■ Foundation work
•Installationareashouldbelargerthanthefootprint
of the pump. Or a plastic base may break due to a
concentrated load.
•Ifpipingvibratessympatheticallywiththepumpin
operation, provide an expansion joint between the
pump and the piping to reduce vibration.
Shim
Foundation bolt
Liner
Concrete
Base

- 14 -
2. Plumbing
2-1. Tightening torque between the pump and pipework
Connect the pump to pipework via inlet and outlet flanges according to the tightening torque below. The
table is based on use of metal pipe flanges with rubber gaskets. Tighten bolts diagonally at even torque.
Bolt size Tightening torque
M16 79N•m
2-2. Piping load and momentum
Try not to apply a heavy load to the inlet and outlet flanges.
Permissible piping weight and moment to the pump are as below.
Load direction Load (k•N)
MDK-20 MDK-25 MDK-32 MDK-40
Inlet ange
Fx (comp.) 0.98 1.35 1.37 1.54
Fx (tens.) 0.69 0.85 0.73 1.32
Fy (comp.) 0.43 0.62 0.71 0.93
Fy (tens.) 0.43 0.62 0.71 0.93
Fz (comp.) 0.36 0.47 0.62 0.84
Fz (tens.) 0.36 0.47 0.62 0.84
Outlet ange
Fx (comp.) 0.93 1.24 1.01 1.01
Fx (tens.) 0.63 0.78 0.62 0.87
Fy (comp.) 1.02 1.07 1.07 1.70
Fy (tens.) 1.02 1.07 1.07 1.70
Fz (comp.) 0.47 0.69 0.50 0.97
Fz (tens.) 0.47 0.69 0.50 0.97
2-3. Suction side plumbing
● Suction lift height depends on liquid temperature. Refer to following table.
Liquid temperature (deg.C) 0 20 40 60 70 80
Suction lift height (m) 7.6 7.2 5.4 3.2 1.7 0.3
(1) Flooded suction is recommended if possible. Employ shorter and less bends as possible. Install pipe supports so
that the pipe load can not be added to the pump.
(2) Do not make the air trap where the air stays. Arrange 1/100 or more inclination towards pump.
(3) Suction pipe must be connected with care so that the air can not get into pump. The air sucked in pump may cause
malfunction of pump. When suction flange is removed, pay attention not to damage the polished surface of check
valve.
(4) If the suction pipe is installed underground, test it with approx. 1.6MPa pressure.
Y
X
Z

- 15 -
Good No Good
(5) Sink the suction pipe end in the liquid of suction tank by depth of 500mm or double of pipe diameter.
(6) Install a reducer in case the pump suction port bore is not the same as suction pipe diameter. Install the reducer so
that the upper part becomes horizontal as shown above. Do not use the suction pipe of which the diameter is
smaller than pump suction bore.
(7) If slurries or foreign matters possibly get into, install a strainer at the end of suction pipe.
(8) Install a compound gauge near to pump to check the excessive vacuum due to clogging by foreign matters.
(9) Take any measure for the foreign matters not to get into the suction tank. Foreign matters may cause pump failure.
Keep sufficient distance between the end of suction pipe and the bottom or side wall of suction tank or liquid
surface.
(10) In case of severe suction condition (pressure of suction tank is lower than atmospheric pressure, suction lift is high,
longsuctionsidepiping),itisrecommendedthatNPSHavailablevalueislargerthan"1.2xNPSHrequiredvalue".
(11) In case of suction lift application (Pump sucks up liquid.), prime the pump when the pump is operated for the first
time.
(12) In case of suction lift application, incline the suction piping ascending towards pump so that no air pocket is made
in suction piping.
(13) In case of flooded suction (Pumps suction port is below the liquid level.), it is recommended that the valve is
installed in suction piping so that the maintenance works can be done easily. Always open this valve during pump
operation because it is installed for maintenance works only.

- 16 -
2-4. Discharge side plumbing
(1) Install pipe support so that the pipe load can not be added to the pump.
(2) Long piping will increase pipe resistance which may prevent pump from desired performance. Calculate pipe
resistance to get suitable pipe size.
(3) It is recommended to install a check valve in the following cases. Take the permissible pressure into consideration
for the selection of check valve.
 ●Longdischargepiping
 ●Dischargeheadexceeds15meters.
 ●Dischargepipeendislocatedat9metersormorehigherthantheliquidlevelofsuctiontank.
 ●Incasetwopumpsareconnectedinparallel
(4) It is recommended to install a gate valve in the discharge piping to adjust flow rate or to avoid overloaded motor. If
bothcheckvalveandgatevalveareinstalled,itisrecommendedthattheyareinstalledinorderofpump→check
valve→gatevalve.
(5) Install a pressure gauge in discharge piping.
(6) If discharge pipe is long horizontally, install a air vent on the way.
(7) If it is possible the liquid in the discharge piping is frozen, install a drain to remove the liquid in the discharge
piping.
3. Electrical wiring
Electrical works must be done by qualified person using quality wiring products observing local laws or shop
standard.
(1) Use a electromagnetic switch suitable for the specification of used motor.
(Voltage and capacity etc.)
(2) If pump is installed outdoor, take measures so that rain or water can not get into the switch.
(3) Electromagnetic switch and push button switch should be securely installed at the place apart from pump.

OPERATION
- 17 -
1. Precautions on operation .................. 18
2. Precautions on operation .................. 18
3. Operation .......................................... 19
4. To stop pump .................................... 19

- 18 -
1. Precautions on operation
2. Preparation for operation
When the pump is operated first time after it was installed or after a long time of rest, do the preparation works as
mentioned below.
(1) Clean piping and tank before liquid is supplied.
(2) Re-tighten bolts to connect flange and pump fixing bolts.
(3) After the pump is primed, fully open the discharge valve. Check to confirm if air vent valve or valve for flushing is
closed.
(4) Direction of rotation of motor
After the pump is primed, check the direction of rotation of motor by rotating it instantly. The direction of rotation is
shown on the pump by arrow. If you find the rotation is in reverse, change two phases wires among three phases.
Caution
● Dry running or operation with suction side valve closed cause pump damage.
Prohibited
● If pump is operated in cavitation condition, stop it within a minute.
Do not run pump with air being sucked in suction port.
● Check the rotational direction of the pump. Clockwise seen from the motor end is
a correct direction. Operation in a reverse direction may cause pump damage.
● If magnet coupling is disconnected, stop the pump within a minute. If pump runs
with magnet coupling disconnected, magnet coupling force is reduced.
● If the pump is operated for a long time with discharge valve closed, liquid tem-
perature increases resulting in pump damage.
Caution
● If power supply is discontinued during the pump operation, turn off the power
switch and open the discharge valve.
● Pay attention so that the discharge pressure does not exceed the pump max.
allowable pressure during the pump operation. (See page 12 for max. allowable
pressure of pump)
Caution
● When high temperature liquid is pumped, the surface of pump body is very hot.
Take protective measures to avoid the burn.
● Noise level
Model MDK-20 MDK-25 MDK-32 MDK-40
Noise level 75dB 80dB
In case the pump noise affects human health or communication to secure a safety, pro-
vide a noise reduction cover. Be careful not to reduce cooling effect by a motor fan.