Product Overview
The GPA2-10-E30R, GPA1-1, GPA1-2, GPA1-4, GPA2-6, GPA2-10, GPA2-16, GPA3-25, GPA3-40, and GPA3-63 are core models of the American VICKERS GPA series low-noise internal gear pumps. The GPA series is manufactured using technology introduced by Vickers Corporation of the USA, available in both single pump and double pump configurations.
The GPA series internal gear pumps feature simple construction, smooth operation, low pressure pulsation, low noise, high reliability, and easy maintenance. The series offers single pump displacements from 1.76 to 63.6 mL/r across nine sizes, which can be combined into various double pump configurations. Rated pressures are available in 6.3 MPa and 10 MPa, with maximum speeds of 2000 to 3000 r/min.
The series is suitable for hydraulic systems in machine tools, baling machinery, injection molding machines, hoisting equipment, die casting machines, wood-based panel processing, and food processing machinery. Engineered as a direct OEM-replacement solution for VICKERS original products, these models fully comply with Vickers original design standards and mounting interface specifications, offering 100% direct interchangeability with OEM pumps. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.
Model Code Breakdown :
GPA — Series: Low-noise internal gear pump
1 / 2 / 3 — Frame size: GPA1 (small), GPA2 (medium), GPA3 (large)
1 / 2 / 4 / 6 / 10 / 16 / 25 / 40 / 63 — Displacement code (mL/r)
E — Pressure rating: E = 10 MPa series
20 / 30 — Design series code
R / R6.3 — Rotation: R = Clockwise (right-hand, viewed from shaft end)
EK1 / EK2 — Configuration: With adjustable relief valve (EK1 = external drain, EK2 = internal drain)
Technical Specifications
GPA Series General Specifications
Series: VICKERS GPA Low-Noise Internal Gear Pump
Technology Source: Manufactured under license from VICKERS (USA)
Pump Type: Fixed displacement internal gear pump
Displacement Range: 1.76 – 63.6 mL/r (nine sizes)
Rated Pressure: 10 MPa (approx. 100 bar)
Optional Pressure Ratings: 6.3 MPa and 10 MPa
Maximum Speed: 2000 – 3000 r/min
Speed Range: 600 – 3000 r/min
Configuration: Single pump / Double pump
Features: Simple construction, smooth operation, low pressure pulsation, low noise, high reliability, easy maintenance
Compatible Fluids: Anti-wear hydraulic oils (0–68℃) / Water-glycol (0–60℃)
GPA1 Series (Small Frame)
GPA2 Series (Medium Frame)
GPA3 Series (Large Frame)
Note: Performance data above are typical values at 1500 r/min, 38℃, with 40 cSt oil. Displacement values are general references for the series; actual displacement may vary slightly depending on specific configuration.
Key Technical Advantages
1. Vickers Licensed Technology – Low-Noise Internal Gear Design
The GPA series is manufactured using technology introduced from American VICKERS Corporation. The internal gear pump design delivers smooth operation, low pressure pulsation, and low noise—significantly reducing fluid noise and mechanical vibration compared to conventional external gear pumps.
2. Comprehensive Displacement Coverage & Flexible Combinations
Single pump displacements range from 1.76 to 63.6 mL/r across nine sizes. Different displacements can be combined into various double pump configurations. Three frame sizes—GPA1 (small), GPA2 (medium), and GPA3 (large)—meet diverse application requirements from precision machine tools to heavy-duty equipment.
3. Dual Pressure Ratings – Strong Adaptability
Rated pressures are available in 6.3 MPa and 10 MPa. Flexible selection based on system working pressure requirements enables optimal cost-performance matching.
4. Integrated Relief Valve – High System Integration
EK1/EK2 configurations include built-in adjustable relief valves (EK1 = external drain, EK2 = internal drain). System pressure protection is achieved without additional valve blocks, simplifying hydraulic system design and reducing costs.
5. Wide Speed Range – Strong Adaptability
Speed range of 600 – 3000 r/min accommodates various prime mover conditions from low-speed motors to high-speed drives.
6. 100% Factory Tested & Direct Interchangeability
Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure retention verification, internal leakage detection, and flow validation. Fully compliant with VICKERS original design standards, with flange dimensions, shaft specifications, and mounting interfaces identical to OEM pumps—direct drop-in replacement with zero modifications required.
Application Areas
The GPA series internal gear pumps are widely used in the hydraulic systems of the following equipment:
Machine Tools: Various metal cutting machine tools, grinding machines
Baling Machinery: Waste baling machine hydraulic systems
Injection Molding Machines: Plastic injection molding machine hydraulic systems
Hoisting Equipment: Cranes, lift platforms
Die Casting Machines: Die casting equipment hydraulic systems
Wood-Based Panel Processing Equipment: Panel production line hydraulic systems
Food Processing Machinery: Food processing equipment hydraulic systems
Expert Maintenance Tips
1. Model Confirmation
The GPA series includes both single and double pump types. GPA1-1, GPA1-2, GPA1-4 belong to GPA1 small frame; GPA2-6, GPA2-10, GPA2-16 belong to GPA2 medium frame; GPA3-25, GPA3-40, GPA3-63 belong to GPA3 large frame. Before installation, confirm the correct displacement based on system flow requirements and verify the complete model code on the pump nameplate.
2. Rotation Direction Confirmation
Suffix “R” indicates clockwise rotation (viewed from shaft end). Before installation, always verify that the PTO rotation direction of the host machine matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to internal components within a short period.
3. Installation Precautions
Thoroughly clean the mounting flange and shaft mating surfaces before installation to ensure no debris remains
Connect the pump shaft and prime mover output shaft using a flexible coupling; coaxiality error ≤ 0.1 mm, end clearance 2–4 mm
Never use the pump flange to support piping weight
The suction line internal diameter must not be less than the pump suction port diameter
The pump base must have sufficient rigidity
4. First Start-Up and Bleeding
Before first start-up, must fill the pump with hydraulic oil through the inlet port—never start dry
After start-up, run at low speed with no load for 2–3 minutes to ensure complete air evacuation from the system
Check for abnormal noise or leakage—internal gear pumps are particularly sensitive to cavitation
5. Fluid and Filtration
Anti-wear hydraulic oil operating temperature range: 0 – 68℃
Water-glycol operating temperature range: 0 – 60℃
Recommended filtration: 25 μm
Maintain system oil cleanliness to ISO 4406 18/15 or better
Regularly replace return line filters to prevent contaminants from entering the pump
6. Periodic Maintenance
Check mounting bolt torque every 1,000 operating hours
Regularly monitor system operating pressure—not to exceed 10 MPa (100 bar) rated pressure
Regularly inspect shaft seals to prevent leakage
If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly
