A robust internal-gear (internal-meshing) rotary pump engineered for reliable transfer of low- to very-high-viscosity liquids and semi-solids. The design uses an internal driving gear on the main shaft to rotate internal and external gears in the same direction; a stationary crescent plate separates the suction and discharge sides to produce smooth, low-pulsation flow and strong suction at the inlet. This construction makes the pump especially well suited to high-viscosity or shear-sensitive media.
Key features
- Handles a very wide viscosity range: approximately 0.2–1,000,000 cP.
- Rotary internal-gear design: positive-displacement operation with minimal pulsation and consistent volumetric delivery.
- Reversible flow capability (change rotation direction or motor orientation to reverse discharge direction).
- Pump body can be rotated so inlet and outlet ports can be positioned at 90° increments for installation flexibility.
- Optional jacketed ports/bores for heat preservation or cooling on the pump body, end cover and bearing housing.
- Construction materials available: cast iron, cast steel, stainless steel (select material based on chemical compatibility and operating conditions).
- Low noise, high efficiency and reduced risk of trapped fluid — simplifies maintenance and prolongs service life.
Typical applications
Used across petroleum, chemical, coatings, dyes, food, oil, pharmaceutical and related industries for pumping Newtonian and non-Newtonian fluids such as silicone oils, rosin, coatings, saponins and other high-viscosity or semi-solid materials.
Why choose this style of pump
Internal-gear pumps deliver steady, metered flow with good suction lift and are tolerant of viscous, shear-sensitive and loaded liquids. The ability to orient ports, add cooling/heating jackets, and choose robust wetted materials makes them a flexible, industrial-grade solution for process lines, dosing, transfer and filling operations.
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