Sumitomo QT32 QT42 QT52 Series Gear Pump | QT32-10F-A QT32-12.5F-A | High Pressure Internal Gear Pump

The QT Series high-pressure internal gear pumps from Chengyuan Hydraulic are premium fluid power components fully compatible with Sumitomo industrial standards. Specifically engineered for servo-hydraulic systems, these pumps utilize a unique internal meshing design to achieve exceptional operating pressures (up to 25MPa) while maintaining ultra-low noise levels. The QT32, QT33, and QT52 series (e.g., QT32-12.5F-A, QT32-16F-A) are widely deployed in precision injection molding machines, press brakes, and various industrial presses. As a high-performance flagship of Chengyuan, every QT pump undergoes 100% simulated full-load testing to ensure pressure ripple characteristics match OEM standards, guaranteeing 100% original-place interchangeability.

Technical Specifications :

• Core Model Series: QT32, QT33, QT42, QT43, QT52, QT53, QT62, QT63

• Displacement Range (QT32): 10.0, 12.5, 16.0, 20.0, 25.0, 31.5 mL/r

• Nominal Pressure: 25 MPa (250 bar)

• Peak Pressure: 31.5 MPa (320 bar)

• Rated Speed: 1500 – 1800 rpm

• Maximum Speed: 3000 rpm (model dependent)

• Control Method: Fixed displacement, optimized for variable speed servo drives

• Mounting Type: F (Standard Flange Mount)

• Porting Configuration: Side Inlet/Outlet

Key Technical Advantages:

• Ultra-Low Noise & Ripple Characteristics: The QT series features a unique straight-tooth internal gear profile that eliminates “trapped oil” and sudden pressure spikes. Even at $250\text{ bar}$, noise levels are significantly lower than competing piston pumps, making it the preferred choice for silent servo-pump systems.

• Superior Volumetric Efficiency: Built with precision axial and radial pressure compensation mechanisms. These structures automatically adjust clearances based on load, ensuring volumetric efficiency remains above 95% during continuous high-temperature and high-pressure operation.

• Perfect Servo Integration: Low rotational inertia and excellent suction characteristics allow the pump to follow servo motor commands—including frequent starts/stops, reverse rotation, and zero-speed pressure holding—with millisecond response accuracy.

• Heavy-Duty Long-Life Design: Gears crafted from specialized alloy steel with advanced heat treatment, combined with high-load sliding bearings, offer extreme fatigue and wear resistance. In high-cycle injection molding applications, service life can reach tens of thousands of hours.

Application Areas:

• Precision Injection Molding: Primary power source for servo-driven clamping and injection control.

• Sheet Metal Machinery: High-pressure hydraulic control for CNC press brakes and shears.

• Industrial Presses: Silent power circuits for drawing, forming, and cold extrusion equipment.

Expert Maintenance Tips:

• Suction Seal Integrity: Internal gear pumps are highly sensitive to air ingress. Ensure the suction flange is hermetically sealed; air bubbles will cause severe vibration noise and drastically shorten bearing life.

• Viscosity Management: Maintain operating temperatures between $30\text{–}55\text{°C}$ with fluid viscosity in the $20\text{–}100\text{ mm}^2/\text{s}$ range. Excessive heat reduces the sealing effectiveness of internal compensation structures.

• Initial Air Bleeding: During initial servo system commissioning, run the pump at low speed without load to bleed air. Wait until the flow is steady and foam-free before gradually loading to nominal pressure.