GPA Series Internal Gear Pump | GPA3-25 GPA3-40 GPA3-63 | GPA3-25-EK1-20R

LIC Hydraulic’s GPA Series high-pressure internal gear pumps are the premier choice for achieving high-performance, low-noise hydraulic drives. This series (including GPA1, GPA2, and GPA3) is optimized for machine tool applications requiring steady pressure and minimal ripple. We offer 100% Drop-in Interchangeability for specific codes like GPA3-25-EK1-20R and GPA3-63-E-20-R6.3. Engineered for continuous duty at pressures up to 250 bar, each pump undergoes 100% full-load efficiency testing to ensure zero-defect reliability in servo-driven or conventional hydraulic stations.

Technical Specifications (Bulleted List)

• Series Models: GPA1, GPA2, GPA3-25, GPA3-40, GPA3-63.

• Rated Pressure: $250\text{ bar}$ ($3625\text{ PSI}$).

• Speed Range: $600\text{ to }3000\text{ RPM}$.

• Fluid Compatibility: Anti-wear hydraulic oil (ISO VG32/46).

• Efficiency: Consistently exceeds $95\%$ volumetric efficiency under peak load.

• Construction: High-tensile cast iron housing with precision-ground internal gears.

Key Technical Advantages

• Ultra-Low Noise Profile: The internal gear meshing design ensures a smooth flow with virtually no pressure spikes, reducing operating noise by up to $15\text{–}20\text{ dB(A)}$ compared to standard gear pumps.

• Integrated Pressure Compensation: Features axial and radial clearance compensation mechanisms that minimize internal leakage, providing consistent torque and speed even at near-zero RPM in servo applications.

• Compact & Modular Design: The small footprint allows for easy integration into tight compartments, making it ideal for high-precision machine tool HPU units.

• High Wear Resistance: Utilizing specialized surface treatments and reinforced bearings, the GPA series is designed for long service life under high-frequency switching cycles.

Application Areas

• Metalworking Machinery: Main power for CNC folding machines, shearing machines, and hydraulic presses.

• Industrial Molding: Reliable power for injection molding and rubber processing equipment.

• Servo-Hydraulic Systems: Perfectly suited for frequency-controlled energy-saving drives.

Expert Maintenance Tips

• Priming is Critical: Never start the pump dry. Ensure the pump body is filled with filtered oil before the first run to protect the internal gear clearances.

• Bleeding Air: After installation, run the system at low pressure for several minutes. Trapped air can cause cavitation, which damages the precision internal gearing.

• Oil Quality Control: To achieve a 10-year service life, maintain oil cleanliness at ISO 4406 19/17/14 or better. High-quality filtration is the best investment for internal gear pumps.