Double internal gear pumps address the need to manage two separate hydraulic circuits and/or configurations for handling high/low pressure flow rates using a single drive motor, while retaining the low-noise and smooth-flow advantages inherent to internal gear technology. Two independent pumping sections, each based on the rotor-satellite geometry, share the same shaft and pump body.

This configuration is a design choice that is highly valued in applications where the overall dimensions of the motor-pump unit must be very compact. Typical applications include machine tools with main and auxiliary circuits, dual-line lubrication systems, press power units, and automation installations where each circuit demands a dedicated and independent flow rate.

Compared to a tandem of two single pumps, the double version eliminates one mechanical coupling, reduces overall group length, and simplifies hydraulic connections. The two stages can have equal or different displacements, providing full freedom in sizing each line.

At Fluid-Hub, you'll find double internal gear pumps selected to ensure:

• Dual outlet with configurable flow rates: each stage can be independently sized to match the specific circuit load.

• Best-in-class noise levels: the internal meshing profile ensures minimal pulsations even with both stages running simultaneously.

• Reduced footprint and weight compared to coupling two single pumps, with a single motor connection.

• Good self-priming capability, simplifying start-up even in systems with long suction lines.

If your system requires a single delivery line or a different technology, consider the alternatives on Fluid-Hub:

• Single internal gear pumps: the most compact configuration in the family, ideal when a single smooth and ultra-quiet flow rate is all that is needed.

• External gear pumps: for applications where robustness and cost containment take priority, even at the expense of higher flow pulsation.

• Helical gear pumps: when pulsation and noise reduction is a key design requirement, for instance in high-performance mobile equipment.

Explore the full range of internal gear pumps and all gear pumps available on Fluid-Hub. For mechanical connection to the motor, browse our dedicated bell housings and couplings; for intake circuit protection, see our suction filters.