Product Overview

The Rexroth A10VSO28DFR1/31R-VSA12N00-S1228 (Material Number: R902401212) is a high-performance axial piston variable displacement pump engineered for open-circuit industrial hydraulic systems. Featuring a swashplate design, this pump delivers precise, load-sensing flow control through its integrated DFR1 pressure and flow compensator, which combines a pressure controller and a flow controller in a single compact housing. With a nominal displacement of 28 cm³/rev and a size 31 through-drive configuration, the A10VSO series is globally recognized for its high power density, fast response characteristics, and exceptional volumetric efficiency. This pump serves as a critical power source in demanding hydraulic circuits, converting mechanical drive energy into controlled hydraulic flow while maintaining system pressure at the exact level required by the load, thereby minimizing energy loss and heat generation.

Technical Specifications

Engineering Features & Advantages

• Precision Performance: The DFR1 load-sensing control adjusts pump displacement to match actuator demand, delivering only the flow required while maintaining a constant pressure differential — significantly reducing throttling losses and system heat.
• High Power Density: Swashplate axial piston design achieves high operating pressures up to 350 bar in a compact, weight-optimized housing suitable for space-constrained installations.
• Industrial Reliability: Built for continuous duty operation under severe industrial conditions, with robust bearings, hardened piston/cylinder interfaces, and proven long service life.
• Direct Fit Replacement: Exact dimensional and functional compatibility with original Rexroth OEM standards, ensuring drop-in interchangeability without modification.

Typical Industrial Applications

This pump is ideally suited for plastic injection molding machines, metallurgical presses, CNC machine tools, and general industrial hydraulic power units requiring precise pressure and flow control. It is also widely deployed in construction and marine hydraulics, where reliable variable displacement performance under continuous duty is essential.

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