Nachi IPH-5B Series Hydraulic Pump | IPH-5B-40-11 IPH-5B-64-11 | High Pressure Internal Gear Pump

The IPH-5B Series high-pressure internal gear pumps from Chengyuan Hydraulic are premium power units fully compatible with Nachi industrial standards. This series is specifically engineered for applications requiring extended service life, high operating pressure, and ultra-quiet performance. By utilizing advanced axial and radial pressure compensation technology, the IPH-5B series (e.g., IPH-5B-40-11, IPH-5B-64-11) maintains exceptional volumetric efficiency even under 30MPa high-pressure conditions. Every unit undergoes 100% simulated load testing before shipment to ensure that mounting dimensions, flow rates, and pressure stability achieve 100% original-place interchangeability.

Technical Specifications :

• Model Range: IPH-5B-40-11, IPH-5B-50-11, IPH-5B-64-11

• Displacement: 40.7 mL/rev, 50.8 mL/rev, 64.8 mL/rev

• Rated Operating Pressure: 25 MPa (250 bar)

• Maximum Peak Pressure: 30 MPa (300 bar)

• Maximum Speed: 2000 rpm

• Minimum Speed: 600 rpm

• Mounting: SAE 2-bolt flange

• Typical Noise Level: 68-73 dB(A) at full load

Key Technical Advantages:

• Dual Axial and Radial Pressure Compensation: The IPH series features a unique compensation structure where side plates and radial seals adjust automatically based on system pressure. This maintains efficiency over 95% at 30MPa while minimizing internal mechanical wear.

• Ultra-Low Noise Performance: The internal gear set utilizes an evolved involute tooth profile design, resulting in a high contact ratio and minimal flow pulsation. This provides an unmatched advantage for indoor hydraulic stations and precision machinery requiring silent operation.

• High-Pressure Stability & Durability: Constructed with high-strength precision cast iron and specialized hardened gear sets, the pump offers excellent contamination resistance and fatigue strength, ensuring consistent output under heavy-duty cycles.

• 100% Interchangeability: Manufactured strictly to Nachi OEM standards, including port positions, drive shaft splines, and flange dimensions. Users can replace original IPH-5B pumps directly without any piping or bracket modifications.

Application Areas:

• Industrial Presses: Main power source for hydraulic shears, press brakes, and high-speed punching machines.

• Injection Molding: Power and holding circuits for servo-hydraulic injection molding machines.

• Precision Machine Tools: Hydraulic systems for grinders and machining centers requiring minimal vibration.

Expert Maintenance Tips:

• Suction Environment Check: Internal gear pumps are sensitive to cavitation. Maintain suction pressure between -0.03MPa and +0.03MPa. Regularly check suction filters to prevent air ingestion.

• Oil Cleanliness Standards: To optimize the pressure compensation mechanism, maintain system oil cleanliness within NAS Grade 9. ISO VG 32/46/68 anti-wear hydraulic oil is recommended.

• Shaft Alignment Precision: Use flexible couplings for installation and ensure that the misalignment between the pump and motor shaft is within 0.05mm to prevent premature bearing failure due to excessive radial loads.