Product Introduction
This Series Internal Gear Pump is a heavy-duty, positive displacement pump engineered to excel at handling high-viscosity, temperature-sensitive, and shear-sensitive fluids. It is the definitive choice for challenging applications involving resins, polymers, adhesives, asphalt, and other thick liquids that are difficult or impossible to move with other pump types. Its unique “gear-within-a-gear” design provides a smooth, low-pulsation flow, making it a reliable and efficient solution for both transfer and metering of demanding fluids.
Design Philosophy & Construction
The pump operates on the highly efficient internal gear principle, which is optimized for viscous fluids.
- Gear-within-a-Gear Principle: The pump features two primary moving parts:
- An external rotor gear, which has internal teeth and is driven by the motor.
- An internal idler gear, which has external teeth and is smaller, rotating inside the rotor. A stationary, crescent-shaped partition is fixed to the pump casing and sits between the two gears in the area where their teeth are not in mesh.
- Pumping Action:
- Suction: As the gears rotate, their teeth begin to un-mesh at the suction port. This creates an expanding volume and a powerful vacuum that draws the thick fluid into the pump.
- Transfer: The crescent partition separates the flow, guiding the fluid into the spaces between the teeth of both the inner and outer gears. The fluid is then carried smoothly around the crescent.
- Discharge: As the gears’ teeth begin to mesh again on the discharge side, the volume is reduced, and the fluid is forced out of the discharge port in a continuous, non-pulsating stream.
- Heavy-Duty & Jacketed Construction:
- The pump is typically built with a rugged cast iron or cast steel casing to handle high temperatures and pressures.
- For applications like resins and asphalt that solidify when cooled, the pump is available with an integrated heating jacket. This jacket allows steam, hot oil, or hot water to be circulated around the pump casing to maintain the fluid at an optimal temperature and ensure it remains liquid.
Key Features & Benefits
- Exceptional High-Viscosity Performance: The large, open flow path and low-speed operation make it the ideal pump for liquids with very high viscosities, ensuring reliable flow without cavitation.
- Gentle, Low-Shear Handling: The gentle pumping action does not agitate or shear the fluid, protecting the integrity of sensitive polymers, resins, and emulsions.
- Smooth, Non-Pulsating Flow: Delivers a very steady and continuous output, which is critical for applications like feeding coating machines or for accurate metering.
- Temperature Control Capability: The optional heating jacket provides precise control over the fluid’s temperature, preventing solidification, reducing viscosity, and protecting the pump from damage.
- Reversible Operation: The pump is bi-directional, meaning the direction of flow can be reversed by simply changing the motor’s rotation. This allows a single pump to be used for both loading and unloading tanks or vessels.
- Excellent Self-Priming: Creates a strong vacuum, allowing it to self-prime and pull fluid from a lower level, even with thick liquids.
Common Applications
The pump is the problem-solver for the most viscous and temperature-sensitive transfer applications.
- Chemical Industry: Pumping all types of resins, polymers, adhesives, isocyanates, and polyols.
- Asphalt & Roofing: Loading, unloading, and transferring hot asphalt, bitumen, coal tar, and roofing compounds.
- Paint, Varnish & Inks: High-viscosity transfer of finished paints, printing inks, and their raw material bases.
- Soaps & Detergents: Moving concentrated surfactants, liquid soaps, and glycerin.
- Food Processing: Transferring highly viscous food products such as chocolate, molasses, corn syrup, and peanut butter (requires a food-grade, sanitary version).
- Oil Refining: Pumping heavy fuel oils, crude oil residue, and lubricating grease.
