Nachi IPH Series Gear Pump | IPH-6B-80 IPH-3B IPH-5B High Pressure Internal Gear Pump Replacement

Genlu Hydraulic proudly introduces our IPH Series (comprehensively covering IPH-3B, IPH-4B, IPH-5B, IPH-6B single configurations and IPH-34B, IPH-34A double combination pumps) high-performance, high-pressure internal gear pumps. This series is engineered as a seamless, premium replacement for the classic Nachi IPH series silent internal gear pumps. Serving as the fluid power core for modern electro-hydraulic servo systems, forging machinery, and energy-saving hydraulic power units, this pump series utilizes advanced axial and radial pressure compensation designs. Genlu guarantees 100% Drop-in Interchangeability across standard SAE mounting flanges, drive shafts, fluid port dimensions, and thread orientations compared to original Nachi units. Every single and double IPH pump undergoes rigorous 100% simulation testing under full dynamic load profiles to certify exceptional volumetric output and fan-grade silent acoustic performance.

Technical Specifications 

• Product Series: Nachi IPH Series High-Pressure Internal Gear Pumps

• Key Model Configurations: IPH-6B-80-11, IPH-34B-10-25-11, IPH-3B-10-3343K, IPH-34A-15-32-TT-11, IPH-5B-50-11

• Displacement Profile Matrix:

  • IPH-3B Base: 3.5 to 16.1 cc/rev

  • IPH-4B Base: 16.2 to 32.3 cc/rev

  • IPH-5B Base: 32.4 to 64.7 cc/rev (e.g., IPH-5B-50)

  • IPH-6B Base: 64.8 to 125.9 cc/rev (e.g., IPH-6B-80)

• Nominal Operating Pressure: 25 MPa (250 bar)

• Peak Circuit Pressure: 30 MPa (300 bar)

• Permissible Operational Speeds: 600 rpm to 2000 rpm (optimally responsive to servo motor frequency tuning)

• Pump Combination Layouts: Single Stage Fixed Pump / Multiple Double Stage Configurations (e.g., IPH-34B/A)

• Direction of Rotation: Code 11 / Standard (Clockwise, viewed from drive shaft facet)

Key Technical Advantages:

• Patented Axial & Radial Gap Compensation: Incorporating an internal spur gear meshing with an internal ring gear, the assembly features floating side plates and radial sealing segments. System fluid pressure automatically charges the plate backings, adjusting clearance envelopes dynamically to sustain volumetric efficiency over $95\%$ under full load.

• Ultra-Low Flow Ripple & Quiet Acoustic Control: Due to the high contact ratio and remarkably short meshing line of the internal gear teeth, flow and pressure pulsations are nearly eliminated. Operating under 25 MPa pressures, the decibel rating remains below 65 dB(A), making it the absolute prime candidate for servo-loop architectures.

• Contamination-Tolerant High-Load Bearings: Heavy-duty hydrodynamic journal bearings (DU bushings) lubricated via forced internal oil film handling enable excellent particle tolerance. This design offers a fatigue lifecycle several times longer than conventional external gear pumps.

• Highly Extensible Through-Drive Double Pump Tech: Modular architecture, like the IPH-34B or IPH-34A, enables dual or triple pump couplings via a single through-shaft. This allows multi-stage fluid distribution combining high-volume/low-pressure and low-volume/high-pressure circuits within a highly compact space envelope.

Application Areas:

• Servo Hydraulic Systems: Energy-saving plastic injection molding machines, rubber vulcanizing presses, and specialized automated shoe-making machines.

• Forging & Metal Processing Machinery: Industrial metal scrap shears, CNC press brakes, and high-precision stamping presses.

• General Industrial Infrastructure: High-pressure lubrication manifolds for metallurgy plants and heavy central power packs for modern CNC machining centers.

Expert Maintenance Tips:

• Suction Line Airtight Integrity (Critical Protocol): Internal gear pumps are highly vulnerable to air ingress during suction cycles. Inlet flanges and fitting joints must be fully secured with high-grade O-rings. Any air intake will induce sharp cavitation screaming and accelerate localized component erosion.

• Mandatory Pre-Priming Before Startup: Following a pump housing replacement or double-pump assembly installation, fill the unit completely with clean hydraulic oil through the port adapters before cranking the motor. Utilize a “jog-start” routine to bleed residual air pockets. Never run dry.

• Minimum Rotational Velocity Limits for Servo Drives: While the IPH series responds perfectly to variable speed motor programming, avoid dropping the speed below 600 rpm during continuous high-pressure holding phases. Running below this limit impairs internal oil-film replenishment, leading to localized heat spikes and accelerated wear.