EIPS2-005 EIPS3-020/025/032/040 Eckerle Internal Gear Pump 400 bar

Product Overview

The EIPS2-005RD34-111 and EIPS3-020RK23-10, EIPS3-025RK23-10, EIPS3-032RK23-10, EIPS3-040RK23-10 are high-pressure internal gear pumps from the German manufacturer ECKERLE EIPS series.

The EIPS series represents ECKERLE’s next-generation gap-compensated high-pressure internal gear pump, developed on the foundation of over 60 years of internal gear pump manufacturing experience. The series features combined radial and axial pressure compensation along with the patented two-piece crescent seal design, delivering exceptional volumetric efficiency and long-term operational stability. The EIPS series incorporates a 180° suction and pressure port arrangement, offering a compact design ideal for industrial and mobile hydraulic applications with space constraints.

The EIPS2 series covers displacements from 5 to 25 cm³/rev with maximum intermittent pressure up to 400 bar; the EIPS3 series offers larger displacement options with equally excellent pressure capabilities.

Interchangeability: The EIPS series is manufactured to exacting ECKERLE original design standards. Mounting flange, shaft type, port dimensions, and rotation direction are fully compliant with genuine ECKERLE specifications, enabling 100% drop-in replacement without any system modification.

Technical Specifications 

EIPS2-005RD34-111

• Brand: ECKERLE (Germany)

• Series: EIPS2

• Displacement: 5.4 cm³/rev

• Continuous operating pressure: 250 bar

• Peak pressure (max. 10 sec): 320 bar

• Maximum intermittent pressure: 350 – 400 bar

• Speed range: 400 – 4,200 rpm

• Maximum speed: 4,200 rpm

• Mounting flange: 52 mm direct mounting

• Rotation: Right-hand (clockwise)

• Thread standard: Metric

• Seal kit: NBR

• Shaft type: Ø19.5 mm

• Net weight: Approx. 2.9 kg

• Housing material: Cast iron

EIPS3-020RK23-10

• Brand: ECKERLE (Germany)

• Series: EIPS3

• Displacement: 20.0 cm³/rev

• Continuous operating pressure: 250 bar

• Peak pressure (max. 10 sec): 320 bar

• Maximum intermittent pressure: 350 – 400 bar

• Maximum speed: 3,600 rpm

• Mounting flange: SAE B 2-bolt (Ø101.6 mm)

• Rotation: Right-hand (clockwise)

• Thread standard: Metric

• Seal kit: NBR

• Shaft type: Straight Ø25 mm with 8 mm key

• Net weight: Approx. 8 kg

• Housing material: Cast iron

EIPS3-025RK23-10

• Brand: ECKERLE (Germany)

• Series: EIPS3

• Displacement: 24.8 cm³/rev

• Continuous operating pressure: 250 bar

• Peak pressure (max. 10 sec): 320 bar

• Maximum intermittent pressure: 350 – 400 bar

• Maximum speed: 3,200 rpm

• Mounting flange: SAE B 2-bolt (Ø101.6 mm)

• Rotation: Right-hand (clockwise)

• Thread standard: Metric

• Seal kit: NBR

• Shaft type: Straight Ø25 mm with 8 mm key

• Net weight: Approx. 8.5 kg

• Housing material: Cast iron

EIPS3-032RK23-10

• Brand: ECKERLE (Germany)

• Series: EIPS3

• Displacement: 32.1 cm³/rev

• Continuous operating pressure: 250 bar

• Peak pressure (max. 10 sec): 320 bar

• Maximum intermittent pressure: 350 – 400 bar

• Maximum speed: 3,000 rpm

• Mounting flange: SAE B 2-bolt (Ø101.6 mm)

• Rotation: Right-hand (clockwise)

• Thread standard: Metric

• Seal kit: NBR

• Shaft type: Straight Ø25 mm with 8 mm key

• Net weight: Approx. 9.5 kg

• Housing material: Cast iron

EIPS3-040RK23-10

• Brand: ECKERLE (Germany)

• Series: EIPS3

• Displacement: 40.1 cm³/rev

• Continuous operating pressure: 250 bar

• Peak pressure (max. 10 sec): 320 bar

• Maximum intermittent pressure: 350 – 400 bar

• Maximum speed: 2,500 rpm

• Mounting flange: SAE B 2-bolt (Ø101.6 mm)

• Rotation: Right-hand (clockwise)

• Thread standard: Metric

• Seal kit: NBR

• Shaft type: Straight Ø25 mm with 8 mm key

• Net weight: Approx. 10.5 kg

• Housing material: Cast iron

Key Technical Advantages

1. Bidirectional Radial and Axial Clearance Compensation

ECKERLE’s patented radial and axial pressure compensation design automatically adapts to clearance variations under different operating pressures and fluid viscosities. The patented two-piece crescent seal design effectively enhances radial pressure compensation performance, ensuring stable volumetric efficiency throughout the entire service life.

2. Exceptional High-Pressure Capability

The EIPS series internal gear pumps achieve maximum intermittent pressure up to 400 bar with continuous operating pressure of 250-330 bar. This outstanding high-pressure performance makes them ideal for injection molding machines, hydraulic presses, and other high-pressure applications.

3. Ultra-Low Noise Operation

The EIPS series operates at noise levels below 66 dB, significantly outperforming comparable products. This low-noise characteristic is particularly valuable in noise-sensitive work environments, contributing to a more operator-friendly workspace.

4. Extremely Low Pressure Pulsation (≤2%)

Pressure pulsation as low as 2% ensures stable system pressure and uniform flow output, effectively extending the service life of other hydraulic components (valves, actuators, etc.) and improving overall machine precision.

5. Wide Speed Range and Compact Design

The EIPS2 series achieves maximum speeds up to 4,200 rpm, while the EIPS3 series reaches up to 3,600 rpm. The 180° suction and pressure port arrangement offers flexible installation options, making these pumps ideal for space-constrained industrial and mobile hydraulic applications.

6. Flexible Multi-Pump Configurations

Supports multi-pump combinations with independent or common suction, accommodating diverse flow and pressure requirements for complex hydraulic systems.

Application Areas

• Injection Molding Machines – Delivers stable high-pressure oil supply for precise injection and clamping control

• Hydraulic Presses & Forming Machines – Meets continuous high-pressure, high-flow demands

• Servo-Hydraulic Energy Saving Systems – Enables on-demand oil supply when paired with servo motors, significantly reducing energy consumption

• Material Handling & Lifting Equipment – Forklifts, lifting platforms, and other handling machinery hydraulic systems

• Paper Industry – Reliable hydraulic power source for long-term continuous operation

• Wind Power Equipment – Hydraulic control systems for wind turbine generators

• Marine & Offshore Engineering – Marine hydraulic systems

Expert Maintenance Tips

1. Fluid Cleanliness Management

EIPS series internal gear pumps are sensitive to fluid contamination. Recommended fluid cleanliness: ISO 4406 18/16/13 (NAS 1638 Class 9) or higher. Install a suction filter with minimum 100 μm filtration and a return line filter with 10 μm filtration.

2. Fluid Viscosity & Temperature Control

Mineral-based hydraulic oils conforming to ISO/DIN standards are recommended. Operating viscosity should be maintained within 10-300 mm²/s. Optimal operating temperature: 40-60°C. For cold starts, ensure fluid temperature is above -10°C to prevent cavitation due to excessive viscosity.

3. Rotation Direction Verification

Always verify the pump rotation direction indicator before start-up (standard EIPS2/EIPS3 configuration is right-hand/clockwise). Start with jog operation to confirm correct rotation, then gradually load to operating pressure.

4. Alignment During Installation

Ensure concentricity between pump shaft and drive motor shaft does not exceed 0.05 mm, with angular misalignment within 0.5°. Flexible couplings are recommended to compensate for minor misalignment. When installing the coupling, avoid applying axial force and never use a hammer.

5. First Start-Up and Bleeding

Before initial start-up, pre-lubricate the pump by filling clean hydraulic oil through the case drain port. After start-up, run the pump in no-load operation for a few seconds to ensure sufficient lubrication. The pump must be bled before building up system pressure. Never allow the pump to run without oil. If the pumped oil still contains bubbles after approximately 20 seconds, investigate the cause.

6. Periodic Maintenance

Replace hydraulic oil and filters every 2,000 operating hours or annually. Regularly monitor pump body temperature (surface temperature should not exceed 80°C) and listen for abnormal noise increases, which may indicate internal wear or cavitation. Provide a cooler if necessary to control fluid temperature.