AA10VSO45DFR/31R-PPA12KB3

The AA10VSO45DFR/31R-PPA12KB3 pump is manufactured by Bosch Rexroth as part of the A10VSO Variable Pumps series. It is intended for closed-loop hydraulic automation where variable displacement supports pressure and flow control. A displacement of 45 cm³ per revolution defines the volume moved by the rotating group each cycle, allowing proportional output to shaft speed. Standard differential pressure control is set at 200 psi, so the pump reduces displacement once that pressure rise is detected. At a shaft speed of 1800 rpm and maximum displacement, the pump delivers 21.4 gpm, supplying medium-flow circuits without oversizing the power unit. Nominal pressure is rated at 4100 psi, giving a working limit suited to high-duty servo valves and cylinders. Nominal speed with full displacement reaches 2600 rpm, providing a reference point for sizing electric or diesel prime movers. Inlet conditions are controlled between a minimum absolute pressure of 12 psi and a maximum of 145 psi to prevent cavitation or seal overload. Torque demand at 100 bar is 53 lb-ft, and power draw at 1800 rpm under 280 bar load is 50 HP, assisting designers in motor selection.

The pump housing tolerates a case pressure of 30 psi, supporting installations where return back-pressure cannot be avoided, and keeping the shaft seal within its load limit. The internal rotating group remains dynamically balanced up to a maximum permissible speed of 3100 rpm, which allows short-term overspeed without component damage; this margin is useful when the prime mover reaches high idle. The maximum flow associated with its nominal operating setting reaches 30.9 gpm, providing headroom for cylinders that demand rapid extension. System limits are defined by a maximum pressure of 5100 psi, ensuring the unit withstands load-induced spikes common in mobile hydraulics. For precise load-sensing, the DFR regulator holds flow deviation to 0.50 gpm so actuator velocity changes stay within tight margins and minimize oscillation in servo loops. When the circuit runs at 280 bar near its rated speed, power consumption rises to 74 HP, and the shaft must transmit 148 lb-ft of torque, data that guides coupling and drive sizing.