Parameter Description of Sumitomo Gear Pumps QT43-31.5/QT53-40/QT53-50

General Overview

1. Model QT43-31.5

1.1 Model Interpretation

• QT: Series identifier, indicating the QT series internal gear pump, adopting advanced internal meshing gear technology and precision manufacturing process.
• 43: Size grade, specifying the pump’s small structural size and matching corresponding compact installation dimension standard, suitable for small and compact equipment layout.
• 31.5: Displacement specification, representing a theoretical displacement of 31.5 cm³ per revolution (cm³/rev), belonging to the small displacement range of the QT series.

1.2 Core Technical Parameters

1.3 Performance Characteristics

• Ultra-Compact & Lightweight: With small structural size and light weight, it is especially suitable for equipment with limited installation space, realizing space-saving layout of hydraulic systems.
• High Efficiency & Energy-Saving: Adopts precision internal meshing gears and optimized flow channel design, with volumetric efficiency up to 94% and overall efficiency up to 89%, effectively reducing energy consumption of the whole machine.
• Low Noise Operation: The optimized gear tooth profile and internal meshing structure minimize flow pulsation and operating noise, ensuring quiet operation in precision equipment.
• Strong Reliability: Made of high-quality alloy materials and subjected to strict precision machining and heat treatment, it has excellent wear resistance and long service life under rated working conditions.

2. Model QT53-40

2.1 Model Interpretation

• QT: Series identifier, indicating the QT series internal gear pump, inheriting the series’ advantages of high efficiency, low noise and reliable operation.
• 53: Size grade, specifying the pump’s medium-small structural size, larger than the 43 size grade, matching corresponding installation dimension standard for medium-compact equipment.
• 40: Displacement specification, representing a theoretical displacement of 40 cm³ per revolution (cm³/rev), larger than the QT43-31.5, belonging to the small-medium displacement range of the QT series.

2.2 Core Technical Parameters

2.3 Performance Characteristics

• Balanced Performance: With a displacement of 40 cm³/rev, it balances compact structure and flow output, adapting to the requirements of small-medium flow hydraulic systems.
• High Pressure Resistance: The reinforced pump body and precision assembly process ensure stable operation under rated pressure of 21 MPa and maximum pressure of 25 MPa, with strong load-bearing capacity.
• Low Pulsation & Stable Flow: The optimized internal meshing structure and flow channel design reduce flow pulsation, ensuring stable pressure output and protecting downstream hydraulic components.
• Easy Installation & Maintenance: Compact structural design, consistent installation dimensions with other QT series models, convenient disassembly and maintenance, reducing equipment downtime.

3. Model QT53-50

3.1 Model Interpretation

• QT: Series identifier, indicating the QT series internal gear pump, maintaining the series’ high-quality and high-reliability characteristics.
• 53: Size grade, same as QT53-40, specifying the pump’s medium-small structural size, matching medium-compact equipment installation dimensions.
• 50: Displacement specification, representing a theoretical displacement of 50 cm³ per revolution (cm³/rev), larger than the QT53-40, belonging to the medium displacement range of the QT series.

3.2 Core Technical Parameters

3.3 Performance Characteristics

• Stable Medium Flow Output: With a displacement of 50 cm³/rev, it provides stable medium flow hydraulic output, suitable for hydraulic systems requiring balanced flow and pressure.
• High Reliability & Durability: The thickened pump body, high-strength gears and precision bearing design ensure stable operation under long-term high-load conditions, with low failure rate.
• Energy-Saving & Efficient: The optimized hydraulic structure reduces internal leakage, improves volumetric efficiency, and effectively saves energy during long-term operation.
• Strong Adaptability: Suitable for a variety of hydraulic oils, with good adaptability to different working temperatures and harsh working conditions, ensuring reliable operation in complex environments.

4. Common Operating Requirements (Applicable to All Three Models)

• Hydraulic Fluid: Recommended to use R&O type and wear-resistant hydraulic oil with ISO VG 32 to 68 (viscosity index ≥ 90). The kinematic viscosity during operation should be 20 to 150 mm²/s to ensure stable operation of the pump.
• Operating Temperature: The ambient temperature range is 0 to 60℃ (32 to 140℉), and the hydraulic oil temperature range is -40 to 65℃ (40 to 149℉). Preheat at low pressure when the startup oil temperature is below -40℃ until it reaches the normal operating temperature.
• Suction Conditions: The suction pressure should be 0.02 to 0.3 MPa (2.9 to 44 psi), and the flow rate at the suction port should be greater than 1.83 m/s (6 ft/sec). A suction strainer with 100 µm (150 mesh) filtering grade is recommended, and a 25 µm line filter should be installed in the return line to protect the pump components.
• Contamination Control: The hydraulic fluid contamination level should be maintained at NAS 10 or lower, avoiding contamination by water and other impurities. Check the fluid color and cleanliness regularly to prevent air or dirt contamination.
• Installation Notes: Install the pump with the shaft horizontally, avoiding radial or thrust loads on the shaft end from pulleys or gears. Bleed air from the pump and pipelines through inching operation (start-stop) during startup to ensure smooth operation. Check for abnormal noise, vibration and leakage during trial operation.

5. Application Scope

• QT43-31.5: Suitable for small flow hydraulic systems, such as small precision machine tools, mini hydraulic power units, light industrial equipment and compact construction machinery.
• QT53-40: Suitable for small-medium flow hydraulic systems, such as small and medium-sized construction machinery, precision hydraulic equipment, plastic machinery and light metallurgical equipment.
• QT53-50: Suitable for medium flow hydraulic systems, such as medium-sized construction machinery, industrial hydraulic stations, packaging machinery and medium-load hydraulic equipment, especially scenarios requiring stable medium flow and medium pressure output.