Bosch Rexroth | AA4VG180EP4DM132L-NXD52F071KH-S
AA4VG180EP4DM1/32L-NXD52F071KH-S
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The AA4VG180EP4DM1/32L-NXD52F071KH-S variable pump belongs to the AA4VG Variable Pumps series and is manufactured by Bosch Rexroth for closed-loop hydraulic automation that requires continuous pressure regulation. The unit handles a nominal pressure of 400 bar, furnishing stable energy to actuators, while the maximum pressure of 450 bar accommodates brief overloads during load spikes. Measuring ports Ma and Mb are rated for 450 bar so diagnostic gauges can read full system pressure. Control ports X1 and X2 accept up to 40 bar, letting pilot signals adjust displacement without leakage. The pilot pressure port Ps matches this 40 bar limit, simplifying pilot line design. A suction port S limit of 5 bar absolute prevents cavitation when drawing fluid from the reservoir. The drain port T1 is restricted to 3 bar, keeping case flow low to protect shaft seals, and a 100 % duty cycle allows the pump to run continuously in automated machinery.
The pump’s electrohydraulic control relies on a proportional solenoid fed by 24 V with a ±20 % tolerance, making it compatible with standard industrial power supplies. Displacement changes begin at a start-of-control current of 200 mA, and a minimum oscillation range of 120 mA reduces hunting around the neutral position. Maximum displacement is reached at an end-of-control current of 600 mA, while a current limit of 0.77 A safeguards the coil against overheating. The winding presents a nominal resistance of 22.7 Ω, aiding accurate driver sizing. A dither frequency of 100 Hz minimizes stick-slip in the control spool for smoother response. The pump continues to operate with circuit temperatures up to 115 °C, maintaining performance in high-temperature environments.
Technical Specifications
Control Ports X1/x2 Pmax
40 bar
Dither Frequency
100 Hz
Drain Port T1 Pmax
3 bar
Duty Cycle
100%
Max Circuit Temperature (a/b)
115 °C
Maximum Pressure
450 bar
Measuring Ports Ma/mb Pmax
450 bar
Minimum Oscillation Range
120 mA
Nominal Pressure
400 bar
Pilot Pressure Port Ps Pmax
40 bar
Proportional Solenoid Current Limit
0.77 A
Proportional Solenoid End-of-control Current
600 mA
Proportional Solenoid Nominal Resistance
22.7 Ω
Proportional Solenoid Start-of-control Current
200 mA
Proportional Solenoid Voltage
24 V (±20%)
Suction Port S Pmax
5 bar (absolute)
1620 Old Apex Road
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