Product Overview
The HQB 025RK23 10S100, HQ12-016RK23-10S122, HQ13 Series, and HQI2/HQI3 Series hydraulic internal gear pumps originate from the German Eckerle Technologies GmbH System ECKERLE technology platform, operated by HOERBIGER under the System ECKERLE brand. Eckerle, founded in 1935, is a globally renowned family-owned manufacturer of internal gear pumps, celebrated for high pressure, low pulsation, and long service life.
These products are gap-compensated constant-flow internal gear pumps featuring axial and radial gap compensation with a two-piece eccentric segment design that enhances radial pressure compensation performance. The engagement length of the gear teeth ensures minimal flow and pressure pulsation, delivering low-noise operation. Pressure pulsation is as low as 2% , with noise levels below 66 dB(A) .
Product Line Description:
HQB Series: Eckerle internal gear pumps; 025 indicates approximately 25 cm³/rev displacement; RK23 denotes shaft/seal configuration; 10S100 is the design code
HQ12 / HQ13 Series: HOERBIGER System ECKERLE internal gear pumps with displacements covering 4 – 100 cm³/rev, specifically developed for sheet metal working machines, presses, and forming equipment
HQI2 / HQI3 Series: HOERBIGER System ECKERLE industrial-grade internal gear pumps with continuous operating pressures up to 330 bar and peak pressures up to 350 bar
Key Interchangeability Advantage: Our HQB/HQ12/HQ13/HQI2/HQI3 series internal gear pumps are manufactured to strict German Eckerle original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces (SAE-A-2 flange), shaft configurations, and port positions are identical to the original product – no modifications required. Every pump undergoes 100% factory performance testing under simulated operating conditions (covering rated pressure, peak pressure, and full speed range performance curves), guaranteeing plug-and-play reliability with zero performance deviation.
Technical Specifications
HQB Series – General Specifications
Product Series: HQB Series Gap-Compensated Internal Gear Pump
Brand: Eckerle Technologies GmbH (Germany)
Pump Type: Internal Gear Pump with axial and radial gap compensation
Displacement Range: 4 – 100 cm³/rev
Continuous Operating Pressure: Up to 250 bar
Peak Pressure: Up to 320 bar
Maximum Speed: 3200 rpm
Pressure Pulsation: ≤ 2%
Noise Level: ≤ 66 dB(A)
Housing Material: Aluminum alloy
Seals: NBR
Mounting Flange: SAE-A-2 bolt
Shaft Type: 25 mm straight shaft
Port Connections: SAE flange standard
Recommended Fluid: ISO VG32 – VG68 hydraulic oil
Operating Temperature Range: -20°C to +80°C
Filtration Requirement: NAS 1638 Class 8, β10>100
HQB 025RK23 10S100
Series: HQB Series Internal Gear Pump
Displacement: Approx. 24.8 cm³/rev
Continuous Operating Pressure: 250 bar
Peak Pressure: 320 bar
Maximum Speed: 3200 rpm
Flow Rate (@1500 rpm): 37.5 L/min
Shaft Type: 25 mm straight shaft
Mounting Flange: SAE B 2-bolt
HQ12 Series (including HQ12-016RK23-10S122)
Series: HOERBIGER System ECKERLE HQ12 Series Internal Gear Pump
Displacement Options: 4 / 5 / 6 / 8 / 11 / 13 / 16 / 19 / 22 / 25 cm³/rev
HQ12-016RK23-10S122 Displacement: 16 cm³/rev
Continuous Operating Pressure: 250 bar
Peak Pressure: Up to 320 bar
Speed Range: 600 – 4000 rpm
Pressure Pulsation: Low-pulsation design
Mounting Flange: SAE-A-2 flange
Typical Applications: Press brakes, presses, sheet metal forming equipment
HQ13 Series
Series: HOERBIGER System ECKERLE HQ13 Series Internal Gear Pump
Displacement Options: Covers larger displacement range (e.g., 050 = 50 cm³/rev)
Continuous Operating Pressure: 250 bar
Peak Pressure: Up to 320 bar
Speed Range: 600 – 4000 rpm
Design Features: Gap-compensated constant-flow internal gear pump
HQI2 Series
Series: HOERBIGER System ECKERLE HQI2 Industrial Internal Gear Pump
Displacement Range: 5 – 25 cm³/rev
Continuous Operating Pressure: 330 bar (NG 5 – NG 16)
Peak Pressure: 350 bar
Maximum Speed: 4200 rpm
Ambient Temperature Range: -40°C to +80°C
HQI3 Series
Series: HOERBIGER System ECKERLE HQI3 Industrial Internal Gear Pump
Displacement Range: 20 – 50 cm³/rev
Continuous Operating Pressure: 330 bar (NG 20 – NG 32) / 250 bar (NG 40 – NG 50)
Peak Pressure: 350 bar (NG 20 – NG 32)
Ambient Temperature Range: -20°C to +80°C
Key Technical Advantages
1. Axial and Radial Gap Compensation for High Efficiency and Long Service Life
The HQB/HQ12/HQ13/HQI2/HQI3 Series features integrated axial and radial gap compensation with a two-piece eccentric segment design that enhances radial pressure compensation performance. Axial compensation is achieved through axial pressure discs, while radial compensation is accomplished via split filler blocks and spring-loaded sealing rollers. This design ensures automatic hydraulic clearance adjustment between gears and housing under all operating conditions, significantly improving volumetric efficiency (≥ 92% , up to 98% ) and minimizing internal leakage – maintaining stable efficiency even under partial load conditions.
2. Ultra-Low Pressure Pulsation (≤ 2%) for Smooth System Operation
The HQB/HQ12/HQ13/HQI2/HQI3 Series delivers pressure pulsation of only 2%. Ultra-low pressure pulsation effectively reduces hydraulic system vibration, ensuring smooth equipment operation and extending the service life of other hydraulic system components.
3. Ultra-Low Noise Operation (≤ 66 dB(A)) for Indoor and Quiet Environments
Thanks to the optimized internal gear design and gap compensation structure, the HQB/HQ12/HQ13/HQI2/HQI3 Series operates at extremely low noise levels, with test values below 66 dB(A) . This characteristic makes it particularly suitable for press brake workshops, injection molding facilities, precision equipment, and other applications with strict noise requirements.
4. High Pressure Capacity for Heavy-Duty Applications
The HQB/HQ12/HQ13 Series delivers continuous operating pressure of 250 bar with peak pressures of 320 bar. The HQI2/HQI3 Series delivers even higher continuous pressure of 330 bar with peak pressures of 350 bar. The HQI2 additionally withstands maximum speeds of 4200 rpm, making it ideal for high-speed, heavy-duty applications.
5. Wide Displacement Coverage and Flexible Configuration
The HQB/HQ12/HQ13/HQI2/HQI3 Series covers displacements from 4 to 100 cm³/rev. The HQ12 Series offers 10 displacement options (4/5/6/8/11/13/16/19/22/25 cm³/rev). Multiple shaft types, seal materials, and mounting configurations are available for easy system integration and upgrades.
Application Areas
Press Brakes and Presses: Sheet metal working equipment, hydraulic press brakes, stamping presses – the signature application for HQB/HQ12 series
Injection Molding Machinery: Hydraulic systems for injection molding and rubber injection machines
General Machine Tools: Hydraulic transmission and control systems for various machine tools
Conveyor and Lifting Technology: Conveying equipment, lifting machinery hydraulic systems
Paper Industry: Paper machinery hydraulic systems
Plastics and Rubber Industry: Plastic injection molding, rubber vulcanization equipment hydraulic systems
Energy-Efficient Servo Drive Systems: Variable-speed servo-driven hydraulic systems
Special Purpose Machinery: Various specialized equipment hydraulic systems
Expert Maintenance Tips
1. Model Confirmation and Selection
Complete HQB/HQ12/HQ13/HQI2/HQI3 series model should include: Series + Displacement + Shaft/Seal Configuration + Design Code.
HQB 025RK23 10S100: 025 indicates approximately 25 cm³/rev displacement; RK23 denotes 25 mm straight shaft configuration.
HQ12-016RK23-10S122: 016 indicates 16 cm³/rev displacement.
HQI2/HQI3 are industrial high-pressure series with continuous pressure 330 bar – higher than HQB/HQ12/HQ13’s 250 bar. Verify operating pressure requirements during selection.
2. Pre-Installation Checks
Confirm pump rotation direction (typically right-hand/clockwise) matches system drive direction.
Check mounting flange type (SAE-A-2 bolt flange) to ensure compatibility with system interface.
Confirm shaft type specifications (25 mm straight shaft) precisely match coupling.
Use couplings to compensate for shaft misalignment – avoid radial or axial forces on the pump drive shaft.
3. First Start-Up & Oil Priming
Prime the pump housing with clean hydraulic oil before first start-up; ensure suction line is fully filled – never run dry.
Recommended fluid: ISO VG32 – VG68 mineral hydraulic oil.
Maintain operating temperature within -20°C to +80°C.
Speed range: 600 – 4000 rpm.
4. Filtration & Fluid Cleanliness
System filtration should meet NAS 1638 Class 8 or better, with filtration rating β10 > 100.
Regularly monitor fluid cleanliness to prevent contaminants from accelerating gear and bearing wear.
5. Operating Monitoring
Continuous operating pressure must not exceed 250 bar (HQB/HQ12/HQ13) or 330 bar (HQI2/HQI3).
If abnormal noise or pressure fluctuation occurs, first check suction lines for leakage or blockage.
Return outflow must be below the oil surface.
Regularly check torque on pump and piping connection bolts to prevent loosening from vibration.
