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Magnetic Drive Internal Gear pumps

Connection sizes
: 1-1/2” to 2-1/2”
Capacity range
: 0.1 – 55 m3/hr
Pressure range
: 1 – 12 Bar
Temperature range
: Upto 250 Deg c
Speed Range
: 20 – 1500 RPM
Viscosity range
: 20 – 5,000 cPs
Pump body & cover
Cast iron / Spheroidal cast iron/
Cast steel/ Stainless steel AISI 304/
Stainless steel SS316
Spheroidal cast iron / Cast steel /
SS304/ SS316 / CrNi stainless steel/
SnBz12 Bronze
Carbon graphite/ Silicon carbide/
Hard metal coated steel
: Sealless magneƟc drive
Model Max flow, m3/hr> Max pressure, Bar Viscosity range, cSt Max speed (Rpm) Max temperature (Deg c)
CMG 1-1/2 5.7 12 10 – 5,500 1400 250
CMGF 2 15 12 10 – 5,500 500 250
CMGF 2-1/2 25.5 12 10 – 5,500 500 250
CMGUF 2-1/2 32 12 10 – 5,500 500 250
CMGF 3 32 12 10 – 5,500 500 250
CMGBF 3 55 12 10 – 5,500 500 150

Internal eccentric gear pump working principle:

The simple “Gear within gear” principle of internal eccentric gear pumps means that there are only 2 moving components within the process medium. the posible displacement of which is achieved by the filling of the cavity between the teeth of both the rotary and ideler gears located in the pump head. With each revolution, a fixed volume of fluid, enetrs the casing through the sucƟon port, filling the space between the teeth of the gears. The crescent within the pump head then seperates the fluid as the idler gear turns on the pump shaft. The following 4 images demonstarate this operaƟon in more detail.

Fluid entering the pump:

The yellow coloured section in the image represents the process & it is entering the pump suction port, pump casing & filling the cavities between the idler gear and rotary gear. The arroes indicate the direction of the fluid passage through the pump and rotational direction of the gears.

Fluid filling the cavities & split of flow:

As the fluid progresses through the pump head and fills the cavities between the gears it is also separated by the crescent shape in the pump head, which acts as a seal preventing back flow between the suction & discharge ports.

Pump almost flooded:

As the fluid fully fills the casing all cavities between the gears are completely filled in the form of locked pockets of fluid to guarantee absolute volume control and enable the pump to deliver a fixed volume per revolution.

Pump is flooded & starts to discharge the process medium under pressure:

Once the pump is fully flooded, the rotor and idler gears mesh together and form a liquid seal which is equidistant between the pump ports which then enables the fluid to exit the discharge of the pump under pressure. The delivery pressure is dependent on the installed power of the motor.


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