R910991846 AA10VS018DFR1/31R-VPA12N00 Rexroth Hydraulic Pump
High-performance axial piston variable pump manufactured in Germany, designed for open-circuit hydraulic systems with pressure and flow control capabilities.
Technical Specifications
| Parameter |
Specification |
| Manufacturer / Series |
Rexroth A10VSO Series 31 |
| Order Code |
R910991846 |
| Full Model |
AA10VS018DFR1/31R-VPA12N00 |
| Pump Type |
Axial Piston Variable Pump (Swashplate Design, Open Circuit) |
| Control Type |
DFR1 (Pressure & Flow Control) |
| Displacement |
18 cm³/rev (Max geometric) |
| Nominal Pressure |
280 bar |
| Peak Pressure |
350 bar |
| Nominal Size |
NG 18 |
| Rotation Direction |
Right-hand (R, viewed from shaft end) |
| Shaft Type |
Parallel Keyed Shaft (DIN 6885) |
| Ports |
S (Suction), B (Pressure), L (Case Drain), X (Control) |
| Port Size |
Code 12 (Metric threads) |
| Mounting Flange |
ISO 3019-2 (SAE 2-bolt) |
| Max. Speed |
3300 rpm (at max displacement) |
| Max. Flow |
~59 L/min (at 3300 rpm) |
| Seal Material |
FKM (Viton) |
| Hydraulic Fluid |
Mineral oils (HL, HLP), HETG, HEES, HFDU |
| Operating Temperature |
-20°C to +80°C |
| Weight |
Approx. 12.9 kg |
| Country of Origin |
Germany |
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Frequently Asked Questions
Q1: What is the function of the "DFR1" control?
DFR1 stands for
"Pressure Flow Controller". It combines two functions:
- Pressure Control (Limiting): Acts as a pressure compensator, destrokeing the pump when system pressure reaches the set value (like a DR control).
- Flow Control (Load Sensing): Automatically adjusts displacement to maintain a constant pressure differential (Δp) across a downstream orifice, providing load-independent flow control. This makes it highly energy-efficient for systems with varying loads.
Q2: What does the "VPA12N00" suffix indicate?
This code defines the mechanical configuration:
- V: FKM (Viton) seals, offering superior chemical and temperature resistance.
- P: Standard parallel key shaft (DIN 6885).
- A12: Port size code 12 (metric threads).
- N00: No through-drive (solid shaft end, cannot mount additional pumps on the shaft).
Q3: What is the key difference between DFR and DFR1?
The primary difference is the integration of the pressure limiter and flow controller. The DFR1 is a more compact and optimized version of the DFR control, offering similar functionality with potentially faster response times and simplified external piping.
Q4: What are the X and L ports used for?
- X Port (Control): Used for load-sensing feedback. It connects to the downstream system to sense the load pressure, allowing the pump to adjust its displacement to maintain the set Δp.
- L Port (Case Drain): Must be connected directly to the tank. It relieves internal leakage pressure to protect the shaft seal (max backpressure typically 2 bar).
Q5: Can this pump be used in a closed-loop system?
No. The A10VSO DFR1 is designed exclusively for open-circuit applications (pump → valve → actuator → tank). For closed-loop hydrostatic transmissions, you would need an A4VG or A2FM series unit.
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