Product Overview
The EIPH series (EIPH2 / EIPH3 / EIPH6), EIPC series (EIPC3 / EIPC5), and EIPS series (EIPS2 / EIPS3) are internal gear pumps from the German manufacturer Eckerle. The EIPH series is a high-pressure industrial series, specifically developed for the demanding requirements of industrial hydraulics. The EIPC series features an aluminum housing for medium-to-high pressure applications. The EIPS series is designed for medium-to-low pressure industrial applications.
The EIPH2 series covers displacements from 4.2 to 25.2 cm³/rev; the EIPH3 series from 14.6 to 64.4 cm³/rev; and the EIPH6 series from 64 to 299.5 cm³/rev. The EIPC3 covers 20 to 64.4 cm³/rev; the EIPC5 covers 40.2 to 100.5 cm³/rev.
Eckerle internal gear pumps feature axial and radial gap compensation technology, delivering low noise, extremely low pulsation (pressure pulsation ~2%), and long service life. They are widely used in injection molding machines, molding machines, and servo-hydraulic energy saving systems.
Every unit is manufactured to original equipment specifications, ensuring 100% drop-in interchangeability. Each pump undergoes rigorous 100% simulated duty-cycle testing to validate pressure-flow-efficiency performance curves.
Brand Disclaimer: This product is a high-quality compatible replacement engineered for full interchangeability with Eckerle original equipment. All Eckerle brand names and model codes are referenced solely to indicate compatibility and interchangeability. This product is manufactured by an independent producer and is not an original Eckerle product.
Technical Specifications
EIPH Series (High-Pressure Industrial Series)
EIPH2 Series
Displacement Range: 4.2 – 25.2 cm³/rev (10 sizes: 4.2, 5.4, 6.4, 7.9, 10.9, 13.3, 15.8, 19.3, 22.2, 25.2)
Continuous Operating Pressure: 250 – 330 bar (varies by displacement)
Peak Pressure (10 sec/15% duty cycle): 280 – 350 bar
Cut-in Peak Pressure: 300 – 400 bar
Speed Range: 400 – 3,600 rpm
Maximum Speed: 4,200 rpm
Operating Viscosity: 10 – 300 mm²/s
Starting Viscosity: 2,000 mm²/s
Operating Temperature: -20°C to +80°C
Inlet Pressure: 0.8 – 2.0 bar (absolute) , min. 0.6 bar for start-up
Weight: Approx. 4.9 – 5.2 kg
EIPH3 Series (User-Specified Models)
EIPH3-014RK23-10: 14.6 cm³/rev, 330 bar continuous， weight 9.4 kg
EIPH3-016RK23-10: 16.0 cm³/rev, 330 bar continuous
EIPH3-020RK23-10: 20.0 cm³/rev, 330 bar continuous
EIPH3-025RK23-10: 25.0 cm³/rev, 330 bar continuous
EIPH3-032RK23-10: 32.1 cm³/rev, 330 bar continuous， 350 bar peak
EIPH3-040RK23-10: 40.0 cm³/rev
EIPH3-050RK23-10: 50.0 cm³/rev
EIPH3-064RK23-10: 64.4 cm³/rev
Speed Range: 400 – 3,000 rpm
Operating Viscosity: 10 – 300 mm²/s
EIPH6 Series
Displacement Range: 64 – 299.5 cm³/rev
Rated Pressure: Up to 33 MPa (330 bar)
Peak Pressure: Up to 35 MPa (350 bar)
EIPC Series (Aluminum Medium-High Pressure Series)
EIPC3 Series
Displacement Range: 20.0 – 64.4 cm³/rev
Continuous Operating Pressure: 180 – 250 bar
Peak Pressure (10 sec/15% duty cycle): 210 – 320 bar
Cut-in Peak Pressure: 210 – 350 bar
Speed Range: 100 – 3,900 rpm
Operating Viscosity: 10 – 300 mm²/s
Starting Viscosity: 2,000 mm²/s
Operating Temperature: -20°C to +100°C
EIPC5 Series
Displacement Range: 40.2 – 100.5 cm³/rev
Continuous Operating Pressure: 180 – 250 bar
Peak Pressure (10 sec/15% duty cycle): 210 – 320 bar
Maximum Speed: 3,000 – 3,600 rpm
EIPS Series (Medium-Low Pressure Industrial Series)
Key Technical Advantages
1. Axial & Radial Gap Compensation – High Efficiency
The EIPH/EIPC/EIPS series all feature axial and radial gap compensation technology. The patented two-piece eccentric segment design effectively enhances radial pressure compensation performance, maintaining high volumetric efficiency even at low speeds and low viscosities.
2. Ultra-Low Noise & Minimal Pulsation (~2%)
Eckerle internal gear pumps are renowned for their low noise characteristics. Pressure pulsation is only approx. 2%, ensuring stable mechanical operation. Noise test values below 66 dB.
3. Ultra-High Pressure Rating – Industrial-Grade Durability
EIPH series continuous pressure up to 330 bar, peak pressure up to 400 bar. EIPC series continuous pressure up to 250 bar, peak up to 320 bar. High-strength design ensures long-term reliability under high-pressure, high-frequency, continuous-duty operations.
4. Extended Service Life & Low Pulsation Design
Eckerle internal gear pumps are known for their long service life. Extremely low flow and pressure pulsation significantly reduce system vibration, extending the service life of the pump and all system components.
5. Broad Speed & Viscosity Range
Operating viscosity range 10 – 300 mm²/s, starting viscosity up to 2,000 mm²/s. EIPH2 max speed 4,200 rpm, EIPC3 max speed 3,900 rpm. Stable performance from low-speed precision control to high-speed continuous duty.
6. Modular Design – Flexible Multi-Pump Expandability
Supports single and multiple pump combinations (separate or common inlet). Flexible combinations adapt to complex hydraulic systems requiring multiple independent flow circuits.
7. 100% Simulated Duty-Cycle Testing
Every pump is 100% tested on dedicated hydraulic test benches under simulated real-world operating conditions—validating pressure-flow characteristics and efficiency curves at rated pressure and full speed range—ensuring zero-defect, plug-and-play performance upon installation.
Application Areas
Injection Molding Machines: Servo hydraulic systems, energy-efficient oil pump systems
Molding Machines: High-pressure hydraulic machinery
Servo-Hydraulic Energy Saving Systems: Variable-speed drives, energy-efficient hydraulics
Industrial Hydraulic Equipment: Presses, press brakes, etc.
Mobile Hydraulics: Off-highway vehicle hydraulic systems
Expert Maintenance Tips
1. Fluid Cleanliness Control
Internal gear pumps have relatively low sensitivity to contamination, but maintain system fluid cleanliness to ISO 4406 19/17/14 or better as good practice. Install a ≤10 μm absolute filtration filter upstream of the inlet port.
2. Inlet Line Requirements
Keep suction lines short and straight with adequate diameter—not less than the port size. Inlet pressure must be maintained between 0.8 – 2.0 bar (absolute) , with minimum 0.6 bar for start-up. Prevent cavitation from insufficient suction.
3. Coupling Alignment Precision
Ensure pump shaft-to-drive shaft coaxiality deviation ≤0.05 mm and angular deviation ≤0.5° during installation. Flexible couplings are strongly recommended.
4. First-Start Priming Procedure
Before initial startup, thoroughly bleed air through the drain port or a loosened outlet fitting. Perform 2–3 jog starts under no-load conditions (outlet open) until oil fills the pump cavity without air bubbles, then connect the load circuit for full operation.
5. Viscosity & Temperature Monitoring
Operating viscosity: 10 – 300 mm²/s; starting viscosity up to 2,000 mm²/s. Operating temperature: -20°C to +80°C (EIPC series up to +100°C). During cold starts when viscosity is high, ensure adequate suction conditions or preheat the fluid.
6. Rotation Direction Confirmation
“R” indicates right-hand (clockwise) rotation; “L” indicates left-hand (counterclockwise) . Always verify that the drive motor/engine rotation matches the pump before installation.
