Bucher QX Series High Pressure Internal Gear Pump | QX6262 QX3223 QX52 | QX6262-125-125-S1361

LIC Hydraulic’s Bucher Hydraulics QX Series internal gear pumps are the gold standard for high-pressure, low-noise industrial applications. The QX series (including QX2, QX3, QX4, QX5, QX6, and QX8) is world-renowned for its ultra-quiet operation and minimal pressure ripple, making it the preferred choice for servo-driven energy-saving systems. We specialize in high-capacity configurations like the QX6262-125-125-S1361 double pump. We guarantee 100% Drop-in Interchangeability with OEM specifications. Each unit undergoes 100% dynamic response and noise decibel testing to ensure zero-leakage performance and exceptional service life in injection molding machines and high-precision presses.

Technical Specifications (Model Breakdown)

• Series Code: QX (High-pressure internal gear) / QXV (For low-viscosity fluids).

• Configuration: Single pumps (QX42, QX52) and Double pumps (QX3223, QX6262).

• Nominal Pressure: $250\text{ to }320\text{ bar}$ ($3625\text{ to }4640\text{ PSI}$).

• Displacement Range: From $5\text{ cc/rev}$ to over $250\text{ cc/rev}$ (per section).

• Speed Capability: Optimized for $0\text{ to }3000\text{ RPM}$, ideal for frequency-controlled servo drives.

• Efficiency: Volumetric efficiency consistently exceeds 96% even at low speeds.

Key Technical Advantages

• Whisper-Quiet Operation: The internal gearing profile eliminates the “trapped oil” effect common in external pumps, resulting in a smooth flow that is up to $20\text{ dB(A)}$ quieter than standard gear pumps.

• Advanced Radial & Axial Compensation: Patented sealing technology automatically adjusts clearances based on system pressure. This allows the pump to maintain high torque and efficiency at near-zero RPMs during pressure-holding phases.

• Unrivaled Durability: The balanced loading of internal components and low-friction bearings result in an extremely long MTBF (Mean Time Between Failure), even under continuous high-pressure cycles.

• Modular Tandem Design: The QX architecture allows for seamless stacking of different pump sizes (e.g., QX3223), providing versatile multi-circuit solutions from a single drive shaft.

Application Areas

• Injection Molding: Primary pump for high-efficiency servo-hydraulic machines.

• Die-Casting & Forging: High-pressure power for aluminum casting and industrial presses.

• Machine Tools: Precise, vibration-free power for grinding and CNC machinery.

Expert Maintenance Tips

• Rotation Direction: QX pumps are unidirectional. When integrating with a servo motor, ensure the drive parameters are locked to the correct rotation; reverse rotation will instantly damage the internal compensation plates.

• System Bleeding: Due to the extremely tight internal tolerances, ensure all air is bled from the pump housing through the highest port before full-pressure operation to prevent vibration.

• Filtration Integrity: To protect the precision-machined gears, maintain fluid cleanliness at ISO 4406 18/16/13. Clean oil is the key to achieving the $10\text{–}15$ year design life of Bucher pumps.