Rexroth A4VG 28,A4VG40,A4VG56,A4VG71,A4VG90 Piston Pump, Hydraulic System EP4 EZ DA HW EP

Flexible Variable Control: Supports multiple control methods, including direct hydraulic control (DG), mechanical servo control (HW), electrical proportional control (EP), electronic two-point control (EZ), and speed-related DA control, enabling stepless adjustment of flow rate and smooth change of fluid flow direction.14.

High-pressure Protection Design: Two relief valves are installed on the high-pressure oil side to prevent system overload and also function as charge valves. An internal auxiliary pump serves as the charge and control pump, and a standard pressure cut-off valve provides additional protection.13.

Efficient and Stable Operation: The flow rate is proportional to the drive speed and displacement. The swashplate angle can be adjusted steplessly to ensure efficient output under different working conditions. An internal charge relief valve limits the maximum charge pressure to optimize system stability.15.

Displacement and Pressure: The displacement ranges from 28 to 250 cm³. The nominal pressure is 400 bar (40 MPa), and the peak pressure can reach 450 bar (45 MPa).13.

Speed Range: The minimum speed is 500 rpm, and the maximum speed varies by specification (e.g., the A4VG28 can reach 4250 rpm), with a maximum limit speed of up to 5000 rpm.514.

Performance Data: At the maximum speed and rated pressure, the output flow rate can reach 600 L/min (A4VG250), the power can reach 400 kW, and the maximum torque is 1590 Nm (Δp = 400 bar).57.

Structural Design: It uses a through-shaft drive and supports tandem pump configuration. The compact housing design features high power density and light weight (e.g., the A4VG28 weighs approximately 29 kg), making it suitable for high-pressure closed systems.17.