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Our Internal Eccentric Gear Pump is based on the “gear within gear” principle. It features a large internal gear with internal teeth and a smaller gear (pinion), separated by a fixed crescent to achieve positive displacement.
This ATEX-available pump is capable of pumping viscous fluids with exceptional performance at low speeds, low pulsation and a smooth flow for consistent product quality.
Typical applications include:
| Max Capacity (m³/hr) | 200m³/hr |
| Max Pressure (Bar) | 15 Bar |
| Viscosity (cSt) | up to 55,000 cSt |
| Max Speed (rpm) | 1400 rpm |
| Max Temperature (°C) | 200°C |
| Part Codes | YMK, YP, YK, YKU, YKF, YMB |
The “gear within gear” principle means there are only two moving components within the process medium. Positive displacement is achieved as fluid fills the cavities between the teeth of the rotary and idler gears in the pump head. With each revolution, a fixed volume of fluid enters through the suction port and fills the spaces between the gear teeth, while the crescent within the pump head separates the fluid as the idler gear turns on the pump shaft.
Fluid entering the pump
As the process medium enters the suction port and casing, it fills the cavities between the idler and rotary gears, and is carried through the pump in the rotational direction of the gears.
Fluid filling the cavities & split of flow
As fluid progresses through the pump head, the fixed crescent splits the flow and acts as a seal, preventing backflow between the suction and discharge ports.
Flooding of the pump
Once all cavities between the gears are filled, they form locked pockets of fluid — guaranteeing absolute volume control and a fixed volume per revolution.
The pump is flooded & discharges under pressure
With the pump fully flooded, the rotor and idler gears mesh to form a liquid seal equidistant between the ports, allowing fluid to exit the discharge under pressure. Delivery pressure depends on the motor’s installed power.