Bucher QXV Series Internal Gear Pump | QXV41 QXV46 QXV51 | QXV46-032R

LIC Hydraulic proudly offers the Bucher Hydraulics QXV Series, a legendary high-pressure internal gear pump engineered for precision and longevity. The QXV series, including frame sizes from QXV41 to QXV51, is specifically optimized for low-viscosity fluids and demanding industrial environments. The model QXV46-032R features Bucher’s proprietary involute gearing, providing nearly ripple-free flow at continuous pressures up to $300\text{ bar}$ ($4350\text{ PSI}$). Known for its world-class low-noise operation and ability to handle fluids like jet fuel and low-viscosity oils, the QXV series remains the gold standard for test stands and high-end servo-hydraulic systems.

Technical Specifications (Bulleted List)

• Series: Bucher QXV (Low Viscosity Optimization)

• Displacement Range: $5\text{ cc/rev}$ (QXV41) to $250\text{ cc/rev}$ (QXV51).

• Max Operating Pressure: Continuous up to $300\text{ bar}$, peak up to $320\text{ bar}$.

• Fluid Compatibility: Mineral oils, synthetic fluids, and low-viscosity fuels ($0.8\text{ to }10\text{ mm}^2\text{/s}$).

• Mounting: SAE and ISO standard 2-bolt/4-bolt patterns.

• Design: Multi-stage internal gear with axial and radial compensation.

Key Technical Advantages

• Exceptional Low-Noise Performance: The non-contact gear meshing reduces vibration and fluid-borne noise to an absolute minimum, often making the motor the loudest part of the system.

• Volumetric Stability: Advanced axial and radial pressure compensation plates ensure that volumetric efficiency remains above $95\%$ throughout the pump’s entire life cycle.

• High Speed Capability: Thanks to the internal gear geometry, QXV pumps can operate at higher speeds compared to standard gear pumps without the risk of cavitation.

• Rugged Construction: Minimal moving parts and large hydrodynamic bearings provide a robust solution that is less sensitive to cavitation and fluid contaminants than piston pumps.

Application Areas

• Aerospace Testing: Fuel injection testing and hydraulic simulation rigs for aircraft components.

• Plastic & Rubber: Core pull and clamping functions in high-speed injection molding machines.

• Oil & Gas: Controlling and lubricating systems for turbines and large compressors.

Expert Maintenance Tips

• Priming the Pump: To prevent dry-running at startup, the pump case must be filled with the operating fluid. This is critical for the QXV series as the low-viscosity fluid provides a thin but vital lubricating film.

• Shaft Alignment: Ensure that the coupling between the motor and the QXV46-032R is perfectly aligned. Even minor misalignment can lead to bearing wear and premature seal failure due to the high internal pressures.

• Monitor Fluid Temperature: While QXV handles low viscosity well, excessive heat can cause the fluid to lose its lubricating properties. Ensure your cooling system is sized to keep the reservoir below $60\text{°C}$ for optimal performance.

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