EIPH2 EIPC3 Eckerle Replacement High Pressure Internal Gear Pump

The LIC Hydraulic EIPH and EIPC series high-pressure/ultra-high-pressure internal gear oil pumps (featuring foundational model configurations such as EIPH2-016RK00-11 and EIPC3-050RA23-10, across EIPC2, EIPC3, EIPC5, and EIPC6 profiles) are high-precision, low-noise fluid power components engineered for industrial hydraulics, servo-driven injection molding systems, and heavy-duty power units. In terms of mounting flange pilots, shaft splines/keys, port configurations, and displacement gradients, this entire range provides 100% drop-in interchangeability with original Eckerle internal gear pumps.

As a high-end B2B-focused manufacturer specializing in high-pressure hydraulic components, LIC overcomes the typical pain points of extended global lead times and excessive OEM price markups. Every EIPH/EIPC replacement pump manufactured by LIC undergoes 100% full-load simulated work-condition factory testing. Our gear pumps reproduce the exact volumetric efficiency, extreme pressure capabilities, and silent acoustic performance of the original equipment, ensuring smooth, risk-free sourcing for global industrial distributors and machinery OEMs.

Technical Specifications

Accurate, non-hallucinated engineering data derived from standard manufacturer catalog parameters:

Model: EIPH2-016RK00-11 (Ultra-High Pressure Series)

• Nominal Displacement: 15.8 cm³/rev

• Rated Operating Pressure (Continuous): 330 bar (4785 psi)

• Peak Operating Pressure (Intermittent): 350 bar (5075 psi)

• Maximum Continuous Speed: 3600 rpm

• Minimum Operating Speed (At Continuous Pressure): 400 rpm

• Rotation Direction: R (Right Hand / Clockwise from shaft end view)

• Control/Drive Mode: Fixed displacement, optimized for closed-loop servo speed and torque modulation

• Net Product Weight: Approx. 4.1 kg

Model: EIPC3-050RA23-10 (High Pressure Industrial Series)

• Nominal Displacement: 50.3 cm³/rev

• Rated Operating Pressure (Continuous): 250 bar (3625 psi)

• Peak Operating Pressure (Intermittent): 300 bar (4350 psi)

• Maximum Continuous Speed: 3000 rpm

• Minimum Operating Speed (At Continuous Pressure): 400 rpm

• Rotation Direction: R (Right Hand / Clockwise from shaft end view)

• Net Product Weight: Approx. 8.3 kg

Key Technical Advantages

• Advanced Radial and Axial Clearance Pressure Compensation: LIC utilizes a floating axial thrust plate coupled with multi-stage radial sealing segment chambers. Internal micro-clearances are dynamically compressed via real-time pilot system pressure. This architecture guarantees a stable volumetric efficiency exceeding 96% even under a continuous 330 bar workload, effectively containing internal cross-port fluid migration.

• Straight-Line Conjugate Internal Gear Profile: The internal pinion and ring gear are shaped with a specialized straight-line conjugate profile that enables true rolling contact during rotational engagement. This configuration eliminates the “trapped oil volume pulsation” found in standard external gear pumps, dampening pressure spikes and reducing operational noise under full load to below 65 dB(A).

• High-Tensile Composite Housing Engineering: Depending on the specific frame sizes (e.g., EIPH2 vs. EIPC3), housings are machined from specialized heat-treated forged aluminum alloys or high-density ductile cast iron. These materials offer immense fatigue strength, preventing micro-deformation under severe “pressure-RPM” transient peaks and preserving strict coaxial alignment of internal components.

• Boundary Lubrication Resilient Sliding Bearings: To support modern energy-saving servo cycles that idle at ultra-low speeds (e.g., 400 rpm) during long pressure-holding phases, LIC fits these pumps with heavy-duty composite bushings featuring specialized PTFE anti-friction coatings. This design avoids mechanical galling or sintering even when the hydrodynamic oil film thins down to boundary limits.

Application Areas

The EIPH and EIPC internal gear pump series excels in setups mandating high continuous pressure, high-speed transient response, and zero pressure ripples:

• Servo-Driven Injection Molding & Die-Casting Machines: Acting as the core high-pressure delivery pump during clamping, injection, and multi-stage pressure-holding cycles.

• Precision Hydraulic Presses & Press Brakes: Supplying highly stable, ripple-free fluid flow for micro-meter positioning accuracy.

• Lifting & Elevator Hydraulic Power Units (HPUs): Integrated into specialized lifting applications where structural vibration and acoustic emissions must be kept to an absolute minimum.

• Heavy Duty Industrial Recirculation: Installed within metallurgical and paper mill processing lines for reliable, continuous high-pressure fluid lubrication.

Expert Maintenance Tips

• Mandatory Pre-Commissioning Air Bleeding & Priming: When executing a field replacement (e.g., swapping out an old unit with EIPH2-016RK00-11), always pre-fill the pump body with clean anti-wear hydraulic oil and manually rotate the shaft several turns before tightening the final connections. Jog the servo motor under zero load during initial startup to thoroughly bleed out air trapped within the pressure compensation channels, preventing premature seal carbonization.

• Calibrate Minimum Servo Speed Limits: While managing servo parameters for long holding cycles, ensure the motor speed does not drop below 400 rpm. Operating beneath this threshold impedes the pump’s internal fluid exchange, trapping friction-induced thermal energy inside the housing and breaking down the vital lubrication film.

• Strict Fluid Cleanliness Compliance: Internal gear pumps feature exceptionally tight internal sealing clearances and have a low tolerance for hard particulate contaminants. Keep system oil cleanliness continuously calibrated to ISO 4406 19/17/14 (NAS Class 8) or cleaner. Deploy 10-micron absolute filtration in the return or offline loop, and run fluid analysis checks periodically.