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Rexroth A10VSO18DFR/31R-PPA12N00 Hydraulic Pump
Overview
The Rexroth A10VSO18DFR/31R-PPA12N00 is a high-performance axial piston variable displacement pump manufactured by Bosch Rexroth. As part of the A10VSO series, 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.
DFR Pressure and Flow Control (Load Sensing) — The pump is equipped with DFR control, which combines pressure compensation (load sensing) with a pressure cut-off function. The FR valve maintains a constant pressure difference (typically around 14 bar) between the pump outlet and the load-sensing signal port, ensuring that the pump delivers only the flow required by the load. When the system pressure reaches the set maximum (controlled by the DR valve), the pump automatically reduces its displacement to a low-flow standby state. This DFR control system enables the pump to match output precisely to system demand, significantly reducing energy waste and heat generation.
Nominal Displacement & Pressure Ratings — The pump has a maximum geometric displacement of 18 cm³ per revolution. It operates at a nominal pressure of 280 bar and can withstand maximum intermittent pressures up to 350 bar.
Compact Design & High Power-to-Weight Ratio — The pump offers a high power-to-weight ratio, contributing to space-saving installation and efficient system design. Its compact size enables powerful hydraulic output without adding excessive weight to machinery. The pump weighs approximately 12–13 kg.
Excellent Suction Performance — The A10VSO series features superior suction characteristics, ensuring reliable operation even under challenging inlet conditions and reducing the likelihood of cavitation.
Low Noise Operation — The pump is designed for low noise levels, with typical operating noise below 75 dB(A), enhancing operator comfort and supporting environmental compliance in noise-sensitive industrial environments.
Long Service Life & Robust Construction — Designed with high-quality materials, a cast iron housing, and wear-resistant components, the pump is built for long-term reliability in demanding industrial environments.
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.
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 ISO standard mounting flanges and standard port connections, ensuring compatibility with a wide range of hydraulic systems. Two case drain ports are provided for convenient installation.
Wide Operating Range — The pump operates effectively with mineral oil-based hydraulic fluids (HLP according to DIN 51524) across a wide viscosity and temperature range, with a recommended fluid cleanliness of ISO 4406 18/16/13 or better.
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.
Load-Sensing Control — The DFR control system provides load-sensing functionality, where the pump automatically adjusts its displacement to maintain a constant pressure difference between the pump outlet and the load. This ensures that the pump delivers only the flow required by the actuator, minimizing overflow losses and improving system efficiency.
Pressure Cut-Off — The DR pressure compensation function provides a pressure cut-off limit. When the system pressure reaches the set maximum, the pump automatically reduces its displacement to a low-flow state, protecting the system from overpressure conditions and reducing energy consumption.
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.
Energy Efficient Operation — The DFR load-sensing control ensures that the pump delivers only the power required by the load, automatically adjusting displacement in response to system demands. This reduces hydro-mechanical losses, minimizes heat generation, lowers power consumption, and contributes to energy savings of 15–25% compared to fixed displacement systems.
High Volumetric Efficiency — The pump delivers high volumetric efficiency of approximately 95%, contributing to overall system efficiency and reduced operating costs.
High Reliability & Low Maintenance — With its robust construction, high-quality materials, and wear-resistant components, the pump ensures long-term operational stability with minimal maintenance requirements, reducing downtime and total cost of ownership.
Application Sectors
The Rexroth A10VSO18DFR/31R-PPA12N00 hydraulic pump is designed for medium-pressure industrial and mobile applications requiring reliable hydraulic power with load-sensing control. The A10VSO series is widely used across a broad spectrum of industries:
| Industry Sector | Typical Applications |
|---|---|
| Industrial Hydraulics | Injection molding machines, hydraulic presses, machine tools, die-casting machines, blow molding equipment |
| Plastics & Rubber Machinery | Plastic injection molding machines, rubber processing machinery, extruders requiring pressure-flow adaptive control |
| Construction Machinery | Excavators, cranes (high energy-saving scenarios), concrete pump trucks, small to medium construction equipment |
| Agricultural Machinery | Combine harvesters, tractors, self-propelled agricultural equipment requiring load-sensing hydraulic systems |
| Mining Equipment | Mining machinery, material handling systems requiring efficient hydraulic power |
| Marine & Offshore | Ship hydraulic systems, deck machinery, marine cranes, steering gear |
| Steel & Metallurgy | Steel mill hydraulic stations, rolling mills, continuous casting equipment |
| Ceramic & Refractory Industry | Ceramic press machines, tile presses, brick presses |
| Paper Manufacturing | Paper mill hydraulic systems, paper machinery hydraulic components |
| Forestry Equipment | Forestry machinery with space constraints and high efficiency requirements |
| Mobile Equipment | Agricultural and forestry machinery requiring compact, efficient hydraulic systems |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Bosch Rexroth |
| Series | A10VSO |
| Model Code | A10VSO18DFR/31R-PPA12N00 |
| Pump Type | Axial piston variable displacement pump (swashplate design) |
| Circuit Type | Open circuit |
| Displacement (Vg max) | 18 cm³/rev |
| Nominal Pressure (Continuous) | 280 bar (4,060 psi) |
| Maximum Pressure (Intermittent) | 350 bar (5,076 psi) |
| Maximum Speed | 3,300 rpm |
| Maximum Flow Rate | 59.4 L/min (at 3,300 rpm) |
| Rated Flow Rate | 27 L/min (at 1,500 rpm) |
| Control Type | DFR — Pressure and flow control (load sensing with pressure cut-off) |
| Pressure Differential (FR) | 14 bar |
| Rotation Direction | Clockwise (R) when viewed from shaft end |
| Series | 31 |
| Shaft Type | Parallel key shaft (DIN 6885) / ISO shaft key |
| Mounting Type | ISO 3019-2 (metric), 2-hole flange |
| Porting | PPA12N00 configuration |
| Through-Drive | N00 — No through-drive |
| Seals | NBR (with FKM shaft seal) |
| Housing Material | Cast iron |
| Weight | 12–13 kg |
| Fluid Compatibility | Mineral oil-based hydraulic fluids (HLP per DIN 51524) |
| Recommended Fluid Viscosity | ISO VG 46 |
| Fluid Temperature Range | -20°C to +80°C (optimal 30–60°C) |
| Fluid Cleanliness Requirement | ISO 4406 18/16/13 or better |
| Minimum Suction Pressure | 0.8 bar absolute |
| Maximum Case Drain Pressure | 0.5 bar |
| Volumetric Efficiency | ~95% |
| Operating Noise |
Conclusion
The Rexroth A10VSO18DFR/31R-PPA12N00 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, DFR load-sensing control, excellent suction characteristics, 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 DFR control system is its defining feature, providing integrated load-sensing and pressure cut-off functionality. This ensures that the pump delivers only the flow required by the load, maintaining a constant pressure difference between the pump outlet and the load-sensing signal port while automatically reducing displacement when the set maximum pressure is reached. This load-sensing capability makes the pump particularly well-suited for applications where energy efficiency and precise flow control are critical, such as injection molding machines, hydraulic presses, and mobile equipment.
With a displacement of 18 cm³, nominal pressure of 280 bar, peak pressure up to 350 bar, maximum speed of 3,300 rpm, and a compact 12–13 kg cast iron construction, this pump is an ideal solution for a wide range of medium-pressure applications — from industrial machinery, injection molding machines, and hydraulic presses to construction equipment, agricultural machinery, and mining equipment.
As a proven, reliable, and energy-efficient solution for open-circuit hydrostatic drives worldwide, the A10VSO18DFR/31R-PPA12N00 stands out as a versatile component where load-sensing control, high-pressure performance, and long-term dependability are essential requirements.
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