IGP Series Internal Gear Pump | IGP4-020 IGP4-025 IGP3 IGP5 | High Pressure

Genlu Hydraulic proudly introduces the IGP Series (IGP3, IGP4, IGP5) high-pressure internal gear pumps, the ultimate power source engineered for industrial hydraulic systems demanding “ultra-low noise” and “minimal flow pulsation.” This comprehensive lineup features core configurations including the IGP4-H020, IGP4-H025, IGP4-H032, alongside specific shaft/rotation coded models like IGP4-016-R01/10, IGP4-020-R01/10, and IGP4-025-R01/10. Highly favored as the primary pump for servo-driven energy-saving systems (such as injection molding power units), Genlu’s IGP series offers 100% Drop-in Interchangeability with industry-leading European standards (comparable to Eckerle EIPH, Voith IPC, and Rexroth PGH series) concerning mounting flanges, port dimensions, and shaft profiles. Supported by our rigorous 100% Simulation Load Testing, each internal gear pump is thoroughly verified for volumetric efficiency, decibel output, and pulsation limits under extreme pressure conditions, guaranteeing silent yet relentless hydraulic power.

Technical Specifications 

• Product Series: IGP3 (Medium displacement), IGP4 (Medium-large displacement), IGP5 (Large displacement)

• Representative Displacements (IGP4 Series): 16 cc/rev (IGP4-016), 20 cc/rev (IGP4-020), 25 cc/rev (IGP4-025), 32 cc/rev (IGP4-032)

• Rated Continuous Pressure: 250 bar (3625 psi)

• Max Peak Pressure: 315 bar (4500 psi)

• Rated Speed: 1500 rpm

• Max Operating Speed: Up to 3000 rpm (for select smaller displacement models)

• Min Operating Speed: 300 rpm (enabled by high volumetric efficiency design)

• Rotation Direction: R (Clockwise, standard) / L (Counter-clockwise)

• Control/Drive Mode: Fixed displacement, perfectly optimized for variable speed closed-loop control via AC servo motors

Key Technical Advantages:

• Ultra-Low Noise & Pulsation: Utilizing an advanced conjugate internal gear profile, the pinion and internal ring gear mesh seamlessly with virtually no relative sliding. This architecture eliminates trapped oil volumes, slashing flow pulsation and reducing overall operational noise by 10-15 dB(A) compared to traditional external gear pumps.

• Dual Axial & Radial Pressure Compensation: The pump cartridge integrates a precision radial compensation crescent and axial floating side plates. As system pressure rises, pressurized fluid automatically forces these elements against the gear faces to seal internal clearances, sustaining volumetric efficiency above 95% even at 250 bar.

• Hydrodynamic Film Journal Bearings: Specialized high-strength plain bearings are employed. During rotation, hydraulic fluid automatically forms a high-pressure hydrodynamic lubricating film between the bearing and the shaft journal. This frictionless operation eliminates physical metal-to-metal contact, exponentially extending the pump’s service life.

• Compact & Low-Inertia Design: Compared to piston pumps or external gear pumps of equivalent displacement, internal gear pumps are significantly more compact and possess very low rotor inertia. This allows for lightning-fast response times during high-frequency start-stop and pressure-holding cycles driven by servo motors.

Application Areas:

• Plastic & Rubber Machinery: Energy-efficient servo hydraulic power packs for injection molding machines, blow molding machines, and vulcanizing presses.

• Metal Forming & Die-Casting: Injection power sources for die-casting machines, CNC press brakes, and small stamping presses.

• Industrial Machine Tools & Metallurgy: Central hydraulic stations, lubrication circuits, and heavy shears in large-scale machining centers.

• Mobile Auxiliary Power: Indoor mobile equipment such as forklifts and aerial work platforms where strict noise restrictions apply.

Expert Maintenance Tips:

• Strict Inlet Vacuum Control: Internal gear pumps are highly sensitive to suction restriction. The inlet vacuum must never exceed 0.08 bar (approx. 2.4 inHg). Use large-diameter, coarse suction filters to prevent cavitation, which drastically increases noise and destroys the internal crescent.

• Cooling During Servo Dwell Phases: In applications requiring extended low-speed pressure holding (e.g., injection molding), ensure the pump speed does not drop below the minimum threshold (typically 300 rpm). This ensures sufficient internal leakage flow to carry away frictional heat and prevent cartridge seizure.

• Fluid Cleanliness Standards: Due to the microscopic clearances in the pressure compensation mechanisms, system fluid cleanliness must be strictly maintained at ISO 4406 18/15/13 (NAS 7) or better. Prior to initial startup, always pre-fill the pump case with clean fluid and jog the motor to expel trapped air.