Nachi IPH Series Hydraulic Gear Pump | IPH-6B-80-11 IPH-5B-64-11 IPH-4A-32-LT | Internal Gear Pump

The IPH Series high-pressure internal gear pumps from Chengyuan Hydraulic are high-performance power units fully compatible with Nachi engineering standards. The core advantage of this series lies in its unique “Axial and Radial Pressure Compensation” structure, allowing it to maintain exceptional volumetric efficiency even at 30MPa. For models like IPH-6B-80 and IPH-4A-32-LT (long shaft/tank mount), we implement ultra-precision ground gear sets. Every pump undergoes 100% simulated full-load condition testing to ensure noise control and service life match original OEM standards, guaranteeing 100% original-place interchangeability.

Technical Specifications:

• Series Models: IPH-2A/2B through IPH-6A/6B

• Displacement (IPH-6B): 80.1 cm³/rev to 125.9 cm³/rev

• Displacement (IPH-3A): 10.1 cm³/rev to 15.8 cm³/rev

• Peak Operating Pressure: 30 MPa (300 bar)

• Rated Operating Pressure: 25 MPa (250 bar)

• Max Speed: 1200 – 2000 rpm (depending on size)

• Minimum Speed: 500 rpm

• Noise Level: ≤ 60-72 dB(A) at 21MPa

• Volumetric Efficiency: ≥ 95%

• Seal Options: NBR (Standard) / FKM (Optional for high-temp)

Key Technical Advantages:

• Dual-Directional Compensation Technology: The IPH series utilizes automatic radial and axial clearance compensation. As pressure builds, internal side plates and radial blocks micro-adjust to seal against the gear faces and outer diameters, minimizing internal leakage and stabilizing efficiency at 25MPa.

• Precision Involute Short-Tooth Gearing: Unlike standard gear pumps, the IPH uses a specialized involute short-tooth profile to minimize gear deformation and fluid entrapment under pressure. This eliminates vibration and keeps noise levels exceptionally low—ideal for noise-sensitive indoor environments.

• High-Load Bearing System: Drive shafts are crafted from high-alloy steel with precision heat treatment, paired with high-load sliding bearings. The LT (Long Shaft) variants are reinforced to ensure the bearings remain cool and aligned during long-term, variable-load operations.

• 100% Interchangeability & Modularity: Mounting flanges (SAE or ISO), shaft extensions, and port specs are identical to original Nachi units. The modular design supports double-pump configurations for easy integration into existing hydraulic circuits.

Application Areas:

• Precision Machine Tools: Primary power for CNC lathes, machining centers, and grinders.

• Heavy-Duty Presses: Main pumps for die-casting, bending, and shearing machines.

• Automated Production Lines: Indoor hydraulic systems requiring 24/7 continuous operation and low noise.

Expert Maintenance Tips:

• Priming and Air Bleeding: Always fill the pump housing with hydraulic oil before initial startup. Use “inching” at low pressure until all air bubbles are purged from the return line to prevent cavitation damage.

• Filtration Standards: Due to the precision fit of compensation parts, maintain a filtration rating of 10μm or better to keep oil cleanliness at NAS Grade 9 or higher.

• Inlet Suction Monitoring: Ensure the suction vacuum does not exceed -0.03MPa. Regularly clean the suction strainer to prevent cavitation and high-pitched noise.