| A4VSO71 Series Axial Piston Variable Pump – Technical Overview |
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| 1. Product Introduction |
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| The A4VSO71 is a high-performance axial piston variable pump designed for open-circuit hydraulic systems. It features a swashplate design, enabling precise and stepless flow adjustment by varying the swashplate angle. This series is widely used in industries such as ceramic presses, steel forging, metallurgy, mining, marine machinery, and engineering equipment due to its reliability and efficiency. |
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| 2. Key Specifications |
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| • Displacement: 71 mL/rev (other sizes in the series include 40, 125, 180, 250, 355, 500, and 750 mL/rev). |
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| • Pressure Ratings: |
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| ◦ Nominal pressure: 350 bar (35 MPa) |
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| ◦ Peak pressure: 400–420 bar (40–42 MPa). |
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| • Speed Range: Compatible with speeds up to 4,000 rpm (dependent on inlet pressure and fluid viscosity). |
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| • Fluid Compatibility: Mineral oils, HFC fluids (water-glycol), with a cleanliness requirement of NAS 9级 or SAE 6级. |
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| 3. Design Features |
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| • Swashplate Mechanism: Allows infinite flow adjustment via swashplate angle control, proportional to drive speed and displacement. |
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| • Long Service Life: Equipped with high-precision, aerospace-grade roller bearings and optimized sealing systems. |
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| • Low Noise & High Efficiency: Advanced design reduces noise while maintaining high power-to-weight ratios. |
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| • Modularity: Through-drive shaft design enables combination with additional pumps for multi-circuit systems. |
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| 4. Control Options |
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| The A4VSO71 supports multiple control modes to suit diverse applications: |
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| • DR/DRG: Pressure control (constant pressure). |
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| • LR: Power control (hyperbolic curve). |
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| • DFR: Load-sensing flow control. |
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| • EO2: Electro-proportional control for precision adjustments. |
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| 5. Installation & Maintenance |
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| • Installation: Can be mounted in any orientation, but the pump casing must remain filled with fluid during operation. |
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| • Flushing Requirements: For non-mineral oils or extreme conditions, a flushing flow of 5 L/min is recommended for the 71-size pump. |
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| • Temperature Limits: |
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| ◦ Operating range: -25°C to +90°C (short-term peaks allowed). |
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| ◦ Storage range: -50°C to +60°C. |
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| 6. Applications |
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| Ideal for high-power hydraulic systems, including: |
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| • Industrial presses (ceramic, forging). |
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| • Marine and offshore equipment. |
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| • Mining and construction machinery. |
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| • Energy and metallurgical plants. |
