Bosch Rexroth | A10VSO18DR31R-VPA12KB2-SO275
A10VSO18DR/31R-VPA12KB2 SO275
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The A10VSO18DR/31R-VPA12KB2 SO275 axial piston unit is part of the A10VSO Variable Pumps series manufactured by Bosch Rexroth for hydraulic drives that require adjustable flow. With a displacement per revolution of 18 cm³, the pump meters a fixed volume of fluid every shaft turn, letting the control system scale output precisely with speed. When the shaft turns at 1800 rpm and the swash plate is at maximum angle, the pump delivers 32 l/min, a rate suitable for moderate actuator circuits. Running at the nominal speed of 3300 rpm and the same displacement setting, flow rises to 59 l/min so that larger consumers can be served without changing hardware. The nominal pressure of 280 bar defines the continuous working load the housing and rotating group can sustain. At this working point the pump can transmit up to 28 kW of mechanical power, while the drive must be able to resist the 80 Nm of torque produced at 280 bar; these figures guide motor sizing and coupling selection.
System designers can momentarily load the pump to a maximum pressure of 350 bar, yet the integrated control on version SO275 caps the pressure setting at 100 bar when the relief function is active to protect downstream components. If a rapid command change is required, the rotating group tolerates a pressure ramp of 16 000 bar/s without instability. Safe overspeed is limited to 3900 rpm when the displacement is trimmed below maximum, giving extra dynamic range for intermittent demands. Pilot control ports accept a signal up to 350 bar so proportional controllers can shift the swash plate under full system pressure. Correct inlet conditions are maintained by keeping the supply above 0.8 bar absolute and below 10 bar, while the high-pressure gallery should not fall under 10 bar absolute to avoid cavitation. Case drainage is allowed up to 2 bar absolute so seal life is preserved, and these pressure windows ensure reliable lubrication, cooling, and overall service life.
Technical Specifications
Displacement Per Revolution
18 cm3
Flow At 1800 Rpm (vg Max)
32 l/min
Flow At Nominal Speed (vg Max)
59 l/min
Max Case Drain Pressure (absolute)
2 bar
Max Inlet Pressure
10 bar
Max Permissible Speed (vg<vg Max)
3900 rpm
Max Pilot Port Pressure (x)
350 bar
Max Power At Nominal Speed (280 Bar)
28 kW
Max Pressure Change Rate
16000 bar/s
Max Pressure Setting (so275)
100 bar
Max Torque At 280 Bar
80 Nm
Maximum Pressure
350 bar
Min High-pressure Side Pressure (abs)
10 bar
Min Inlet Pressure (absolute)
0.8 bar
Nominal Pressure
280 bar
Nominal Speed (vg Max)
3300 rpm
1620 Old Apex Road
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