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Rexroth A10VSO45DRG/31R-VPA12N00 Hydraulic Pump
Overview
The Rexroth A10VSO45DRG/31R-VPA12N00 is a high-performance axial piston variable displacement pump manufactured by Bosch Rexroth. As part of the A10VSO Series 31, this pump features a swashplate design and is engineered for open-circuit hydraulic systems, delivering precise control of fluid flow and exceptional reliability in demanding industrial and mobile applications. The A10VSO series is widely recognized for its high power density, excellent suction characteristics, low noise operation, and long service life.
Technical Features
Swashplate Axial Piston Design — The pump utilizes a swashplate-type axial piston variable displacement design specifically tailored for open-circuit hydrostatic transmissions. The flow output is proportional to the input drive speed and displacement volume, and by adjusting the swashplate angle, output flow can be infinitely varied from zero to maximum displacement.
DRG Remote Pressure Control — The pump is equipped with DRG control, which is a remote pressure control system. Unlike standard DR pressure control where the pressure setting is adjusted locally on the pump, DRG allows the maximum pressure setting to be adjusted remotely via an external pilot relief valve connected to the control port. This remote control capability is particularly useful in applications where multiple pumps operate in parallel and share a common pressure setting, as it allows all pumps to be controlled simultaneously from a single remote relief valve. The DRG control maintains a constant maximum pressure at the pump outlet within the setting range of 50 to 350 bar.
Nominal Displacement & Pressure Ratings — The pump has a maximum geometric displacement of 45 cm³ per revolution. It operates at a nominal pressure of 280 bar (4,060 psi) and can withstand maximum intermittent pressures up to 350 bar (5,076 psi). At its nominal speed of 2,600 rpm, the pump outputs 117 L/min, developing 55 kW of hydraulic power for cylinders or motors.
Excellent Suction Performance — The A10VSO series features superior suction characteristics with a minimum absolute inlet pressure requirement of 0.8 bar to prevent cavitation. This ensures reliable operation even under challenging inlet conditions and promotes consistent fluid flow.
Low Noise Operation — The pump is designed for low operating noise with low pressure pulsation, enhancing operator comfort and supporting environmental compliance in noise-sensitive industrial environments.
Long Service Life & Robust Construction — Designed with high-quality materials, a robust cast iron construction, and wear-resistant components, the pump is built for long-term reliability in demanding environments. The drive shaft can withstand both axial and radial loads.
Short Control Response Times — The pump features short control response times, ensuring rapid adaptation to changing system demands and precise operation in dynamic hydraulic applications.
High Power-to-Weight Ratio — The pump offers an excellent power-to-weight ratio. It weighs approximately 23.5 kg (without through-drive), contributing to space-saving installation and efficient system design.
Through-Drive Capability — The pump supports through-drive capability (N00 indicates no through-drive in this specific configuration, but the series supports it), allowing for the mounting of additional pumps up to the same nominal size directly onto it without requiring separate coupling mechanisms. This allows for versatile multi-circuit system configurations.
Clockwise Rotation — The pump is designed for clockwise rotation when viewed from the shaft end, denoted by the "R" in its model code, ensuring proper operation and compatibility with other hydraulic components.
Standardized Mounting & Porting — The pump features an ISO 2-hole mounting flange (ISO 3019-2 / SAE J744 Type A). The VPA12N00 porting configuration includes specific sealing and shaft configurations, with N00 indicating no through-drive.
FKM Shaft Seal with NBR Housing Seals — The pump is equipped with NBR (nitrile rubber) seals for the housing and an FKM (fluoroelastomer) shaft seal, ensuring compatibility with standard mineral oil-based hydraulic fluids (HLP according to DIN 51524-2).
Wide Operating Range — The pump operates effectively with mineral oil-based hydraulic fluids across a wide viscosity and temperature range. The maximum continuous fluid temperature is +110°C, with a maximum case pressure of 2 bar absolute and a maximum inlet pressure of 10 bar.
Key Functionalities
Stepless Variable Displacement — The flow rate can be infinitely varied by adjusting the swashplate angle, providing precise, stepless control over hydraulic output across the entire operating range from zero to maximum displacement. This allows the pump to optimize flow according to actual needs, improving overall system efficiency.
Remote Pressure Control — The DRG control system is the defining feature of this pump. It allows the maximum system pressure to be set remotely via an external pilot relief valve connected to the control port. When the system pressure reaches the set maximum, the pump automatically reduces its displacement to a low-flow standby state, maintaining constant pressure while protecting the system from overpressure conditions. When the pilot valve is de-energized, the pump operates at a low standby pressure (approximately 15 bar), allowing for no-load starting.
Open-Circuit Hydrostatic Transmission — The pump is specifically designed for open-circuit operation, where fluid returns to the reservoir after each cycle, making it ideal for industrial and mobile hydraulic systems requiring consistent and powerful operation.
Multiple Pump Configurations — The through-drive capability allows the pump to serve as a primary unit driving secondary pumps (gear pumps or axial piston pumps up to the same nominal size), reducing system complexity and enabling compact, space-saving hydraulic system designs.
Energy Efficient Operation — The DRG pressure control ensures that the pump delivers only the flow required to maintain the set pressure, automatically adjusting displacement in response to system demands. This reduces hydro-mechanical losses, minimizes heat generation, and lowers power consumption compared to fixed displacement systems.
High Reliability & Low Maintenance — With its robust construction, high-quality materials, wear-resistant components, and proven design, the pump ensures long-term operational stability with minimal maintenance requirements, reducing downtime and total cost of ownership.
Application Sectors
The Rexroth A10VSO45DRG/31R-VPA12N00 hydraulic pump is designed for medium-pressure industrial and mobile applications requiring reliable hydraulic power with remote pressure control capability. The A10VSO series is widely used across a broad spectrum of industries:
| Industry Sector | Typical Applications |
|---|---|
| Industrial Hydraulics | Hydraulic presses, machine tools, injection molding machines, die-casting machines, test rigs |
| Construction Machinery | Excavators, cranes, concrete pump trucks, small to medium construction equipment |
| Mining Equipment | Mining machinery, material handling systems requiring efficient hydraulic power |
| Marine & Offshore | Ship hydraulic systems, deck machinery, steering gear, offshore platform equipment |
| Metallurgy & Steel | Steel mill hydraulic stations, rolling mills, forging presses |
| Agricultural Machinery | Combine harvesters, tractors, self-propelled agricultural equipment |
| Ceramic & Refractory Industry | Ceramic press machines, tile presses, brick presses |
| Industrial Automation | Automated production lines requiring precise hydraulic control |
| Energy Industry | Wind turbine pitch systems, power plant hydraulic equipment |
| General Industry | Industrial manufacturing lines, hydraulic power units |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Bosch Rexroth |
| Series | A10VSO, Series 31 |
| Model Code | A10VSO45DRG/31R-VPA12N00 |
| Pump Type | Axial piston variable displacement pump (swashplate design) |
| Circuit Type | Open circuit |
| Displacement (Vg max) | 45 cm³/rev |
| Nominal Pressure (Continuous) | 280 bar (4,060 psi) |
| Maximum Pressure (Intermittent) | 350 bar (5,076 psi) |
| Nominal Speed (at Vg max) | 2,600 rpm |
| Maximum Speed (reduced displacement) | 3,100 rpm |
| Maximum Flow Rate (at 2,600 rpm) | 117 L/min |
| Rated Power (at nominal speed and pressure) | 55 kW |
| Torque Output (at 280 bar) | 200 Nm |
| Control Type | DRG — Remote pressure control |
| Pressure Setting Range | 50 to 350 bar |
| Standby Pressure (pilot de-energized) | Approx. 15 bar |
| Rotation Direction | Clockwise (R) when viewed from shaft end |
| Shaft Type | Parallel key shaft |
| Mounting Type | ISO 2-hole flange (ISO 3019-2 / SAE J744 Type A) |
| Porting Configuration | VPA12N00 |
| Through-Drive | Without through-drive (N00) |
| Seals | NBR housing / FKM shaft seal |
| Housing Material | Cast iron |
| Weight (without through-drive) | 23.5 kg |
| Fluid Compatibility | Mineral oil-based hydraulic fluids (HLP per DIN 51524-2) |
| Maximum Continuous Fluid Temperature | +110°C |
| Minimum Inlet Pressure (absolute) | 0.8 bar |
| Maximum Inlet Pressure | 10 bar |
| Maximum Case Pressure (absolute) | 2 bar |
| Pilot Port Pressure Capability | 350 bar |
| Fluid Cleanliness Requirement | ISO 4406 minimum (recommended 18/16/13 or better) |
Conclusion
The Rexroth A10VSO45DRG/31R-VPA12N00 is a high-performance axial piston variable displacement pump that exemplifies Bosch Rexroth's decades of expertise in hydraulic drive technology. With its advanced swashplate design, DRG remote pressure control, excellent suction characteristics, through-drive capability, and robust cast iron construction, it delivers exceptional power density, precise flow control, and reliable operation for demanding open-circuit hydraulic systems.
The pump's DRG control system is its defining feature, providing remote pressure adjustment capability via an external pilot relief valve. This allows the maximum system pressure to be set from a distance, making it particularly well-suited for applications where multiple pumps operate in parallel and share a common pressure setting. The remote control capability also enables no-load starting, reducing mechanical stress on system components during startup.
With a displacement of 45 cm³, nominal pressure of 280 bar, peak pressure up to 350 bar, maximum speed of 2,600 rpm, maximum flow of 117 L/min, and a compact 23.5 kg cast iron construction, this pump is an ideal solution for a wide range of medium-pressure applications — from industrial machinery, machine tools, and hydraulic presses to construction equipment, agricultural machinery, mining equipment, marine systems, and energy industry applications.
As a proven, reliable, and energy-efficient solution for open-circuit hydrostatic drives worldwide, the A10VSO45DRG/31R-VPA12N00 stands out as a versatile component where remote pressure control capability, high-pressure performance, and long-term dependability are essential requirements.
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