Internal gear pumps

In working environments where noise protection and precision take priority, HYDAC internal gear pumps set the standard. Thanks to the special design principle – an internally toothed gear driving an externally toothed pinion – a continuous, virtually pulse-free flow rate is generated. The result is a dramatic reduction in noise emissions compared to conventional external gear pumps. At the same time, our PGI models allow operating pressures of up to 330 bar, making them a highly efficient alternative for challenging pressing and injection moulding applications.

Design superiority

The PGI series stands out thanks to its intelligent sealing concept and compact design:

Radial and axial compensation: volumetric efficiency is maximised across the entire pressure range thanks to flexible sealing elements inside the system.
Low pulsation: the geometry of the interlocking teeth ensures minimal pressure fluctuations, reducing stress on pipes and valves.
Extended speed range: thanks to their excellent suction capabilities, these pumps are ideal for use with frequency converters, particularly in start-stop operations.

Performance data for the PGI series

Size	Flow rate (cm³ per unit)	Max. nominal pressure	Special feature
PGI 100	1.6 – 25.2	Up to 300	Ultra compact, with high speed stability
PGI 101	20.0 – 64.4	Up to 250	High power density for industrial blocks
PGI 102	4.2 – 249.9	Up to 330	Maximum pumping capacity with running smoothness
PGI 103	65.3 – 249.9	Up to 250	Optimised design for maximum efficiency and long-lasting continuous operation.

The foundation for smart drives

Design engineers and system planners prefer the PGI series for energy-efficient, variable-speed drives. Because the pump maintains stable pressure even at very low rotational speeds (e.g. during a press’s holding operation), it couples perfectly with our variable-speed drives. The PGI range’s long service life and low maintenance requirements (thanks to its generously sized sliding bearings) make it a cost-effective investment for 24/7 industrial operations. HYDAC offers technologically advanced solutions that reduce your energy costs while improving workplace comfort by reducing noise levels.