Brochure

ManualsBrandsLittle Giant ManualsIndustrial PumpsTE-7-MD-CK Pump Head without Motor

About our

Magnetic Drive Pumps

About our

Magnetic Drive Pumps

About our

Rear

thrust

washer

Outer

driven

magnet

Inner

driven

magnet

Front

thrust

washer

Magnet

housing

(static seal)

Spindle

shaft

O-ring

Motor

Pump

discharge

Impeller

bushing

Pump

intake

Impeller

No leakage

The magnetically coupled pump system replaces the shaft

seal found in conventional pumps. The use of chemically

resistant polymers for the materials of construction permits

highly corrosive liquids to be pumped without causing

corrosion to the pumping chamber. Advanced materials used

in the MD-HC and MD-CK Series offer the highest level of

chemical resistance and provide excellent temperature and

strength properties.

Operating principle

A pair of magnets, which form part of the impeller and

motor shaft, drives the centrifugal pump. The magnet

housing separates the pump chamber and motor shaft. This

seal-less pump design eliminates conventional mechanical

shaft seals because the motor shaft magnetically drives the

impeller magnet by transmitting torque through the magnet

housing. The combined coupling torque of the drive magnet

and impeller magnet provides sufﬁ cient power to move a

wide range of liquids including high-density liquids.

1-AA-MD

TE-7-MD-CK

A variety of models from 11 L/min to 183 L/min

Little Giant MD Pumps can be selected for almost every application because there are over thirty different models

available. The pumps are grouped in four product ranges from the 1-AA-MD with the lowest ﬂ ow rate to the

TE-7-MD-CK with the highest ﬂ ow rate. Special purpose, high capacity models as well as economical models offer a

wide selection. High-density acids such as concentrated sulfuric acid can be pumped by the larger models without over-

load by changing impeller sizes. Each pump assembly consists of only a few parts. Therefore maintenance, disassembly

and inspection are very easy to perform.

Pump selection guide

Several factors are involved in the proper selection of a magnetic drive pump. Caution should be exercised in matching

the wetted pump parts to the chemicals and concentrations in the solution to be pumped. For the chemical resistance

of the wetted pump parts, refer to Little Giant Pump Company Chemical Resistance Chart (Form #995516).

Factors that must be taken into consideration in choosing a pump

• Pump Characteristics: Capacity (liters per minute or

hour), discharge lift (in meters), suction lift (if any), outlet

pressure (bar or Kg/cm2), inlet and outlet pipe size and

horizontal pipe length and any noise limitations.

• Fluid characteristics: Chemical composition, temperature

and solids content in suspension (nature, size and abra-

sive quality) and density or approximate concentration

percentage (weight per liter) and viscosity at the liquid’s

normal pumping temperature.

• Other characteristics: Motor electrical requirements

(Volts, Hertz, Phase), space limitations and normal

ambient air temperature of the area in which the

pump and motor will be installed.

Little Giant Magnet Driven Pumps feature a leak-

proof design that allows the pump to be used in a

variety of applications where continuous and reliable

operation is desired and when pumping corrosive

liquids is necessary. Four series of pumps are

offered: the MD, the MD-SC, MD-HC and MD-CK.

The four groups offer increasing product features

and chemical resistance. Little Giant MD pumps

are in wide use in over 40 countries operating in

applications ranging from circulating photographic

solutions in ﬁ lm processing machines to moving

harsh chemicals in electroplating equipment. The

pumps are also found in OEM ﬁ ltration equipment

pumping de-ionized water and in many other ﬂ uid

transfer processes.