Nachi IPH IPC Series Internal Gear Pump | IPH4-25 IPH5-40 IPC4 IPC5 | High Pressure

The IPH/IPC Series high-pressure internal gear pumps by Chengyuan Hydraulic are precision components fully compatible with Nachi industrial standards. Featuring advanced axial and radial pressure compensation structures, these pumps maintain exceptional volumetric efficiency even under $30\text{ MPa}$ pressure. As Chengyuan’s premier low-noise series, every IPH/IPC pump undergoes 100% simulated full-load testing to ensure noise and ripple characteristics match the original specifications. These are the ideal power solutions for injection molding machines and CNC press brakes, ensuring 100% original-place interchangeability.

Technical Specifications :

• Core Models: IPH4-25-101, IPH5-40-101, IPC4-32, IPC6-100 (Covering series 3, 4, 5, 6, 7)

• Displacement Range: $3.6\text{ cm}^3/\text{rev}$ to $125.9\text{ cm}^3/\text{rev}$

• Nominal Pressure: $25\text{ MPa (250 bar)}$

• Peak Pressure: $30\text{ MPa (300 bar)}$

• Rated Speed: $600\text{–}2000\text{ rpm}$

• Volumetric Efficiency: $\ge 95\%$ under high pressure

• Operational Noise: $\le 65\text{ dB(A)}$ (Typical load)

• Sealing Material: NBR or Viton (FKM) available

Key Technical Advantages:

• Dual Pressure Compensation: Utilizing special axial support plates and radial sealing blocks that tighten as pressure increases. This eliminates internal leakage and ensures stable, high efficiency throughout the pump’s lifecycle.

• Ultra-Low Pressure Ripple: The continuous contact design of internal gears results in highly uniform flow output. With pressure ripples at only $1/3$ the level of external gear pumps, it significantly improves the positioning accuracy of actuators and reduces system vibration.

• Exceptional Quietness: Specially ground gear teeth and smooth volume transitions in the suction zone suppress cavitation noise. Even at high pressure, the noise level is remarkably lower than piston pumps, making it perfect for indoor factory environments.

• Long-Term Mechanical Stability: Supported by high-load sliding bearings and forced oil-film lubrication, the non-contact sealing principle minimizes mechanical wear, ensuring reliability during 24/7 continuous operations.

Application Areas:

• Plastics Machinery: Pressure-holding circuits for injection molding and blow molding machines.

• Sheet Metal Equipment: CNC press brakes and precision shearing machines.

• Machine Tools: Power sources for vertical/horizontal machining centers and hydraulic servo systems.

Expert Maintenance Tips:

• Direction Verification: Model codes (e.g., 101) define port orientation and rotation. Verify against the nameplate before installation; reverse rotation will cause immediate damage to compensation blocks.

• Contamination Control: The internal structure is highly precise. A $10\mu\text{m}$ high-pressure filter is recommended. Fluid contamination will scratch compensation plates, leading to pressure loss.

• Startup Bleeding: Before initial startup, manually rotate the shaft and loosen the pressure-side fitting to bleed air until the oil flow is bubble-free, preventing erosion caused by dry friction.