Modular External Gear Pumps

How does an Internal Eccentric Gear Pump work?

Image 1: Fluid entering the pump: The orange coloured section in the image represents the process medium as it is entering the pump suction port, pump casing & filling the cavities between the Idler Gear (Red) & Rotary Gear (Brown). The 3 arrows indicate the direction of fluid passage through the pump and rotational direction of the gears.

Image 2: 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.

Image 3: 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.

Image 4: 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.

• Accurate and pulseless flow at high differential pressures
• Ability to pump fluids too viscous for Centrifugal Pumps (higher differential pressures than Centrifugal Pumps)
• High mechanical efficiency across different pressures and varying flow
• Efficient suction lift applications
• Ability to operate at different points on their curves as flow is proportional to rotational speed
  and pressure is dependent on the installed motor power
• Bi- Directional flow
• ATEX-available for use in hazardous environments

Max Capacity (m³/hr)	7,7m³/hr
Max Pressure (m)	300m
Viscosity (cSt)	up to 550 cSt
Max Speed (rpm)	1500 rpm
Max Temperature (°C)	100°C
Materials & Limits
Connection Sizes	¾” – 2”
Capacity Range	1 – 7.7 m³/hr
Pressure Range	10 – 300m
Temperature Range	up to 100ºC
Speed Range	50 – 1500 rpm
Viscosity Range	20 – 550 cSt
Pump Body & Cover	Cast Iron, Cast Steel, Stainless Steel AISI 304/316
Gears	Steel, Stainless Steel AISI 304/316
Bearings	SnBz12 Bronze, Carbon Graphite, Ina Bushing Bearings
Sealing	Soft Seal / Packed Gland, Lip Seal, Mechanical Seal

Sizes Available: