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A4VSO series Rexroth Piston Pump
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Description
Rexroth A4VSO Series Variable Displacement Piston Pumps
1. Product Overview
The Rexroth A4VSO series is a range of variable displacement axial piston pumps with a swashplate design, manufactured by Bosch Rexroth, a leading provider of hydraulic solutions. Specifically engineered for open-circuit hydrostatic drive systems, these pumps feature output flow proportional to the drive speed and displacement, which can be infinitely adjusted by modifying the swashplate angle. Reversing the swashplate angle across the centerline enables smooth reversal of the flow direction. With excellent suction performance, rapid control response, and robust construction, the A4VSO series is widely recognized for its long service life, low noise level, and outstanding power-to-weight ratio. Its through-shaft structure allows for stacking to form combination pumps, enhancing system flexibility.
2. Technical Specifications
2.1 Core Parameters
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Specification Item
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Details
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|---|---|
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Nominal Pressure
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350 bar
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Maximum Pressure
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400 bar (absolute)
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Displacement Range
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40 – 1000 cm³/rev (models include A4VSO40, A4VSO71, A4VSO125, A4VSO180, A4VSO250, A4VSO355, A4VSO500, A4VSO750, A4VSO1000)
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Maximum Speed
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Varies by model: 2200 rpm (A4VSO40) to 1000 rpm (A4VSO750/1000)
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Flow Rate
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Proportional to drive speed and displacement; up to 1000 L/min (at maximum speed for large models)
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Case Pressure (Maximum Leakage Pressure)
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4 bar (absolute)
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Hydraulic Fluid
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HLP mineral oil conforming to DIN 51524, with specific viscosity ranges for cold start, warm-up, continuous, and short-term operation
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Weight
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39 kg (A4VSO40) to 605 kg (A4VSO1000), depending on model
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2.2 Key Design Features
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Axial piston swashplate design for open-circuit operation
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Through-drive capability for mounting additional pumps of the same nominal size
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Modular design for easy integration and maintenance
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Visual swivel angle indicator for convenient monitoring
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Optional mounting positions to adapt to different system layouts
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High-precision aviation-grade full roller bearings for extended service life
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Suitable for operation with HF fluids under reduced operational data
3. Applications
Thanks to its high pressure capacity, reliability, and flexible control, the A4VSO series is widely applied across multiple industries requiring robust hydraulic power. Typical application fields include:
3.1 Construction Machinery
Provides stable and efficient power for heavy equipment such as excavators, cranes, loaders, and bulldozers. The pump’s high pressure resistance and rapid response meet the dynamic load requirements of construction operations, ensuring precise control of mechanical movements.
3.2 Metallurgy and Steel Industry
Ideal for steel and forging machinery, including rolling mills, press machines, and metallurgical equipment. Its robust structure and resistance to harsh working conditions (e.g., high temperature and vibration) ensure continuous operation in demanding metallurgical processes.
3.3 Mining Machinery
Adaptable to mining equipment such as hydraulic excavators and mine-specific pumps. The pump’s durability and high load-bearing capacity enable reliable performance in dusty, high-humidity, and heavy-load mining environments.
3.4 Marine Engineering
Used in ship steering systems, deck machinery, and other marine hydraulic equipment. Its excellent sealing performance and corrosion resistance ensure stable operation in marine environments with high salt content.
3.5 Industrial Automation and Machinery
Widely employed in hydraulic presses, injection molding machines, die-casting machines, and machine tools. The infinitely adjustable flow rate and precise control response support high-precision process operations, improving production efficiency and product quality.
3.6 Oil and Energy Industry
Applied in oil drilling equipment, energy chemical plants, and wind power pitch systems. The pump’s energy-saving characteristics reduce operational costs, while its redundant design ensures high reliability in critical energy infrastructure.
4. Supplementary Notes
For explosive environments, specific models of the A4VSO series (e.g., Series 10, 11, 30) comply with the ATEX directive 2014/34/EU, with certification for zones II 2 G Ex h IIC T4-T1 GB X and II 3 G Ex h IIC T4-T1 GC X. Regular maintenance in accordance with the manufacturer’s manual is recommended to extend service life, with the service life primarily limited by built-in bearings and shaft seals.
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