CBQT-F540/F420-AFPL CBQ2 Series Hydraulic Double Gear Pump | High Pressure Tandem Pump

The CBQT Series (e.g., CBQT-F540/F420-AFPL) by Chengyuan Hydraulic is a high-performance double external gear pump designed for dual-circuit independent supply in heavy-duty applications. This series integrates two pump stages into a single modular unit, ensuring 100% original-place interchangeability with standard high-pressure gear pumps. We guarantee the highest reliability through 100% simulated condition testing, ensuring every unit delivers maximum volumetric efficiency and durability in the field.

Technical Specifications (Bulleted List)

• Model Code: CBQT-F540/F420-AFPL (and full CBQ2 Series)

• Front Pump Displacement (P1): $40\text{ ml/r}$

• Rear Pump Displacement (P2): $20\text{ ml/r}$

• Rated Pressure: $20\text{ MPa (200 bar)}$

• Peak Pressure: $25\text{ MPa (250 bar)}$

• Rated Speed: $2000\text{ r/min}$

• Max Speed: $2500\text{ r/min}$

• Control Mode: Fixed Displacement High-Pressure Output

• Shaft Types: Spline Shaft (A) or Straight Key (F)

• Connection Types: Flange (P) or Threaded (L) Ports

• Rotation: CW (Right) or CCW (Left)

Key Technical Advantages

• Three-Piece High-Strength Construction: Built with high-tensile extruded aluminum and cast iron covers, our pumps withstand extreme pressure pulsations without housing distortion, protecting internal bearings and seals.

• Axial Clearance Compensation: Utilizing floating bushings and pressure-balanced side plates, the pump automatically adjusts clearances based on load, maintaining a volumetric efficiency of over $93\%$ throughout its lifespan.

• Premium DU Bearings: High-load self-lubricating DU bushings provide superior radial support, minimizing vibration and ensuring low-noise operation even under high-speed conditions.

• Modular Tandem Engineering: The specialized coupling design between P1 and P2 stages allows for independent operation and zero interference, offering maximum flexibility for hydraulic circuit design.

Application Areas

• Road Machinery: Steering and vibration systems for rollers; hydraulic drives for pavers.

• Lifting Equipment: Outrigger controls for truck cranes and power units for truck-mounted cranes.

• Sanitation Vehicles: Power sources for garbage compactor valves and sweeper auxiliary systems.

Expert Maintenance Tips

• Pre-Lubrication: Before initial startup, fill the pump housing through the inlet port with clean hydraulic oil. Never start the pump dry to prevent immediate galling of the side plates.

• Filtration Standards: Maintain system filtration at $25\text{ μm}$ or better. Hydraulic oil should be monitored to stay within ISO 4406 19/17/14 cleanliness standards.

• Alignment Accuracy: Ensure the coupling alignment deviation is within $0.05\text{mm}$. Excessive radial load will cause premature failure of the front shaft seal.