Johnson Pump MDR Series - Type Designation; Function and Operating Principle

7
MDR/EN (0909) 1.0
• Thepumpunitmustnotbeexposedtorapidtemperaturechangesoftheliquid
without prior pre-heating/pre-cooling. Absolutely forbidden to flush a hot pump with
cold water. Big temperature changes can cause crack formation or explosion, which in
turn can entail severe personal injuries.
• Thepumpmustnotoperateabovestatedperformance.
• Beforeinterveninginthepump/system,thepowermustbeshutoffandthestarting
device be locked. When intervening in the pump unit, follow the instructions for
disassembly/assembly. If the instructions are not followed, the pump or parts of the
pump can be damaged. It will also invalidate the warranty.
• Ifthepumpdoesnotfunctionsatisfactorily,contactyourdistributor.
1.4 Type designation
Example
1 Family name
Magnetic Drive Centrifugal Pump
2 Pump size
45, 75, 85, 105, 116
3 Pump material
P2 = polyvinylidenfluoride (PVDF)
P3 = polypropylene (PP)
4 Impeller diameter
1V = full diameter for specific gravity up to 1.2 kg/dm
3
and viscosity 10 cP
1VD = reduced diameter for specific gravity up to 1.8 kg/dm
3
and viscosity 30 cP
1.5 Function and operating principle
The drive magnet, attached to the drive shaft transfers its torque to the impeller magnet.
The impeller can thereby rotate around the ceramic shaft in the pump body without any
physical contact between the drive shaft and the pump body. This makes the pump
completely leak-proof.
Ceramic shaft
Impeller magnet
Impeller
Magnet housing
Drive shaft
Drive magnet
MDR 45 P2 - 1V
1 2 3 4