CPO-20-P-10R Internal Gear Pump | Sumitomo CPO Series Replacement

Genlu Hydraulic proudly introduces our CPO Series (spanning full displacement range from 08 to 100) high-performance internal gear pumps. This series is engineered to be a seamless, high-value replacement for Sumitomo (Sumitomo Heavy Industries) CPO series industrial hydraulic pumps. Specifically optimized for plastic injection molding, die-casting, and precision industrial servo-hydraulic systems, the CPO series is renowned for its ultra-low noise, exceptional service life, and stable performance under high-pressure conditions. Genlu guarantees 100% Drop-in Interchangeability in mounting flanges, drive shaft profiles, and port geometries compared to the original Sumitomo units. Each CPO pump undergoes rigorous 100% simulation load testing to ensure optimal volumetric efficiency and reliability, making it the perfect choice for hydraulic system upgrades and industrial power units.

Technical Specifications 

• Product Series: Sumitomo CPO Series Internal Gear Pump

• Configuration Model: CPO-20-P-10R (and full series CPO-08 to CPO-100)

• Displacement: 20 cc/rev (for CPO-20 model)

• Rated Operating Pressure: 25 MPa (250 bar)

• Maximum Peak Pressure: 28 MPa (280 bar)

• Maximum Speed: 3000 rpm

• Control Mode: Fixed displacement, internal gear transmission

• Rotation Direction: Clockwise (R)

• Fluid Compatibility: Mineral hydraulic oil; recommended viscosity 10-300 cSt

Key Technical Advantages:

• Pulsation-Free Internal Gear Design: Utilizing a unique internal gear meshing mechanism, the pump delivers a near-constant fluid flow, virtually eliminating pressure pulsations and maintaining noise levels below 65dB(A) during operation.

• Precision CNC Gear Profiling: Core gears are forged from wear-resistant alloy steel and nitrided for extreme durability. Precision tooth profiling minimizes friction losses and maximizes volumetric efficiency even under high-pressure loads.

• Automatic Pressure Compensation: Integrated axial and radial pressure compensation mechanisms automatically adjust internal clearances based on system demands, maintaining a high-performance seal and minimizing internal bypass.

• High-Rigidity Casing: The pump body is engineered using high-rigidity cast iron, analyzed via Finite Element Method (FEM) to ensure structural stability and prevent housing deflection during high-pressure cycles.

Application Areas:

• Injection & Die-Casting Machinery: Main system pressure supply and servo-energy-saving control circuits.

• Industrial Presses & Forming Equipment: Main power output for hydraulic press brakes and forging machines.

• Machine Tools & Machining Centers: High-pressure power sources for cooling/lubrication and auxiliary clamping systems.

• Servo-Hydraulic Systems: High-precision test benches where noise suppression and dynamic response are mission-critical.

Expert Maintenance Tips:

• Strict Fluid Cleanliness (ISO 4406 17/15/12): Internal gear pumps are highly sensitive to particulate contaminants. Always use high-performance filtration (≤10µm) on the inlet side to prevent early pitting of the gear meshing surfaces.

• Cold Start Protection: After extended downtime or in cold environments, perform a low-speed, no-load warm-up cycle for 10-15 minutes before applying full system load to ensure adequate internal lubrication.

• Drive Shaft Alignment: Always use a flexible coupling when connecting to the electric motor. Maintain a coaxiality error within 0.05mm to avoid radial loading that can lead to premature failure of the pump shaft seal.