GPA Internal Gear Pump | GPA1 GPA2 GPA3 Series | GPA1-2-EK2-20R6.3 High Pressure Pump

LIC Hydraulic presents the GPA Series, a premium line of fixed displacement Internal Gear Pumps. Covering frame sizes GPA1, GPA2, and GPA3, this series (including models like GPA1-2-EK2-20R6.3) is designed for high-pressure industrial applications where noise reduction and precision are paramount. Based on the legendary Eckerle design, the GPA series utilizes dual axial and radial pressure compensation to deliver near-perfect volumetric efficiency. Our GPA pumps are 100% interchangeable with original Bosch Rexroth and Eckerle units and undergo 100% dynamic load testing to ensure zero-defect performance.

Technical Specifications

• Series Codes: GPA1, GPA2, GPA3

• Common Models: GPA1-2-EK2-20R6.3, GPA1-4-EK2-20R6.3, GPA2-16, GPA3-63

• Displacement: 1.7 to 63.0 cm³/rev

• Nominal Pressure: 250 bar (3625 psi)

• Peak Pressure: 315 bar (4570 psi)

• Speed Range: 500 to 3600 rpm (Servo-compatible)

• Noise Levels: 50 – 65 dB(A) (Ultra-quiet operation)

• Drive Shafts: SAE Standard Splined or Parallel Keyed

• Fluid Compatibility: Mineral oils and Fire-resistant fluids (HLP/HFC)

Key Technical Advantages

• Dual Pressure Compensation: The radial and axial compensation system automatically adjusts clearances based on the actual load, ensuring efficiency remains above 96% throughout the pump’s life.

• Whisper-Quiet Performance: The internal gear engagement geometry significantly minimizes flow ripples, resulting in operational noise levels far lower than comparable piston or external gear pumps.

• Robust Low-Speed Stability: Engineered with low internal friction, these pumps provide consistent torque and flow even at low RPMs, making them the industry standard for Servo-Hydraulic drives.

• High Pressure Capability: Despite its compact size and quiet operation, the GPA series easily handles continuous duties up to 250 bar, offering high power density for machine tools.

Application Areas

• Plastic Machinery: High-efficiency Servo-driven Injection Molding Machines.

• Metal Working: Precision CNC Bending Machines, Shears, and small Hydraulic Presses.

• Machine Tools: Grinding machines and high-precision CNC machining centers.

• Testing Rigs: High-pressure lab environments requiring pulse-free hydraulic flow.

Expert Maintenance Tips

• Case Priming: Never start the pump dry. Fill the pump body through the inlet port and rotate the shaft manually to ensure internal lubrication of the compensation plates.

• Filtration Protocol: To protect the precision-lapped internals, maintain oil cleanliness at ISO 18/15/12 or better. High-quality pressure filters are strongly recommended.

• Air Ingestion Warning: Ensure the suction line is perfectly airtight. Internal gear pumps are highly sensitive to aeration; any air bubbles will cause severe pressure fluctuations and damage the internal gear profiles.