Bosch Rexroth | A10VSO45DRG31R-VPA12K25
A10VSO45DRG/31R-VPA12K25
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The A10VSO45DRG/31R-VPA12K25 pump is manufactured by Bosch Rexroth as part of the A10VSO Variable Pumps series and provides variable flow for hydraulic automation systems. Its displacement is 45 cm³ per revolution, allowing precise adjustment of actuator speed. When operated at nominal speed with maximum displacement, the pump supplies 30.9 gpm (117 l/min), supporting medium-duty circuits that need steady flow. A nominal pressure capability of 280 bar defines the continuous load the housing and ports can sustain. The DRG pressure control maintains a differential of 290 psi (20 bar), keeping load-sense performance stable. Power demand at nominal speed and 280 bar is 74 HP (55 kW), so prime movers can be sized accurately. Shaft torque at the same condition reaches 148 lb-ft (200 Nm), indicating the mechanical strength required at the coupling. Clockwise rotation matches standard industrial engines, and a maximum permissible speed of 3100 rpm offers a wide operating envelope.
When the unit runs at maximum displacement, speed must not exceed 2600 rpm to prevent excessive inlet velocities. A maximum pressure limit of 350 bar sets the ceiling for short-term overloads in the circuit. The internal case volume of 0.420 gal (1.6 l) stores leakage oil that lubricates bearings and cools rotating parts. Pilot fluid consumption can reach 1.2 gpm (4.5 l/min), a value designers must include in total pump flow calculations. Cold starts are permitted down to –13 °F (–25 °C) provided fluid viscosity remains below 1600 cSt, ensuring reliable operation in low-temperature installations. During continuous duty the fluid may rise to +230 °F (+110 °C), so hose and seal materials need corresponding thermal ratings. The pump weighs 52 lb (23.5 kg) without a through drive, which simplifies manual handling and mounting in confined power-unit frames.
Technical Specifications
Case Volume
0.420 gal (1.6 l)
Cold Start Min Temperature
–13 °F (–25 °C)
Cold Start Viscosity Max
1600 cSt
Differential Pressure (drg)
290 psi (20 bar)
Direction Of Rotation
Clockwise
Displacement
45 cm3/rev
Flow At Nnom (vg Max)
30.9 gpm (117 l/min)
Max Fluid Temperature
+230 °F (+110 °C)
Max Permissible Speed
3100 rpm
Max Speed At Vg Max
2600 rpm
Maximum Pressure
350 bar
Nominal Pressure
280 bar
Pilot Fluid Consumption Max
1.2 gpm (4.5 l/min)
Power At Nnom (280 Bar)
74 HP (55 kW)
Torque At 280 Bar (vg Max)
148 lb-ft (200 Nm)
Weight Without Through Drive
52 lb (23.5 kg)
1620 Old Apex Road
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