Multistage Internal Gear Pump GPC4 Series | GPC4-40-1E2F3-G5 | GPC4-63/50/40

LIC Hydraulic’s GPC4 Series multistage internal gear pumps are the gold standard for high-pressure, quiet-running industrial power. Designed for precision and durability, the GPC4 series (ranging from GPC4-20 to GPC4-80) offers a linear, pulsation-free flow that is essential for modern servo-driven machinery. We provide 100% Drop-in Interchangeability for complex configurations like GPC4-40-1E2F3-G5 and multi-stage units like GPC4-63/50/40-1E2F1-30L. With continuous pressure ratings up to $25\text{ MPa}$, these pumps utilize a specialized axial and radial pressure compensation system to ensure maximum volumetric efficiency and a service life that exceeds standard piston pumps in factory environments.

Technical Specifications (Quick Reference)

• Series Models: GPC4 (Standard High Pressure).

• Displacement Grades: $20, 25, 32, 40, 50, 63, 80\text{ cc/rev}$.

• Rated Pressure: $25\text{ MPa}$ ($3625\text{ PSI}$).

• Peak Pressure: $31.5\text{ MPa}$ ($4570\text{ PSI}$).

• Efficiency: Over $95\%$ volumetric efficiency through pressure compensation.

• Noise Level: Significantly lower than external gear and piston pumps, ideal for indoor use.

Key Technical Advantages

• Whisper-Quiet Operation: The straight-tooth internal gear design results in a smooth meshing cycle, reducing noise to as low as $65\text{ dB(A)}$, even under full load.

• Ultra-Low Pressure Ripple: The high overlap coefficient of the internal gears provides a near-constant flow, which is critical for applications requiring high precision and surface finish quality.

• Servo-Optimized Performance: The GPC4 is specifically designed to handle the frequent stop-start and variable speed cycles of modern servo-hydraulic machines, offering rapid pressure buildup and energy-saving hold-pressure phases.

• Dual Pressure Compensation: Advanced axial and radial compensation plates adjust automatically to internal pressures, maintaining tight clearances and high efficiency even as the pump ages.

Application Areas

• Injection Molding: Primary power source for energy-efficient servo-driven plastic machines.

• Metal Forming: High-speed presses, CNC bending machines, and shearing equipment.

• Material Testing: Providing stable, ripple-free oil flow for sensitive hydraulic test benches.

Expert Maintenance Tips

• Rotation Compliance: Always verify the rotation direction (L for Left, R for Right) before powering the system. Operating a GPC4 pump in the wrong direction will result in catastrophic failure of the internal compensation components.

• Prevent Cavitation: Internal gear pumps are sensitive to suction conditions. Ensure the inlet piping is large enough and the suction filter is clean to prevent the high-pitched “whine” caused by cavitation.

• Temperature Management: For servo systems, maintain oil temperatures between $40\text{–}55\text{°C}$. Excessive heat reduces oil viscosity, which can compromise the effectiveness of the pressure compensation plates and lead to increased wear.

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