Rexroth Series Manual Control Valves A4VG28-90 HD

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Product details

1. Product Positioning

TheRexroth A4VG28-90 HD Series Manual Control Valvesare high-pressure axial piston variable displacement pump modules designed by Bosch Rexroth for closed-loop hydraulic systems. The "HD" suffix denotesHigh Dynamicperformance, enabling precise flow/pressure regulation in applications requiring rapid response (e.g., construction machinery, marine propulsion).

Typical Applications:

• Construction Equipment: Excavators, rollers, cranes (closed-loop drive systems)

• Industrial Vehicles: Forklifts, aerial work platforms (hydrostatic transmission)

• Marine Propulsion: Steering gears, bow thrusters (variable displacement control)

• Energy Systems: Wind turbine pitch control, drilling rig power heads

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2. Key Specifications

【表格】

Parameter A4VG28-90 HD Typical Values

Displacement Range 28–90 cm³/rev (stepless adjustment via manual control lever)

Rated Pressure 400 bar (continuous); Peak pressure: 450 bar (short-term)

Speed Range 600–3000 rpm (compatible with diesel engines or electric motors)

Control Mode Manual Mechanical Control (HD version supports remote handle/short lever)

Weight ~25–35 kg (including valve block, excluding motor/engine)

IP Rating IP65 (dust/waterproof for outdoor use)

Fluid Compatibility Mineral oil, HFA/HFB water-based fluids (viscosity 10–400 mm²/s)

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3. Technical Features

3.1 Manual Control Unit

• Control Type:

• Mechanical Lever: Direct swashplate angle adjustment via rotation/push-pull (HD: 1:1 force feedback).

• Remote Operation: Optional cable-operated handle (max. 5m length) for centralized cab control.

• Precision:

• Flow control resolution ≤1% FS (full scale); Pressure regulation lag <0.3s.

3.2 HD High Dynamic Design

• Swashplate Structure: Dual-acting bearing support reduces friction losses, enhancing response speed.

• Charge Pump: Integrated high-pressure charge pump (optional) prevents suction void in closed loops.

• Contamination Resistance: Port plate with laser-cladded coating; NAS 1638 ≤9 grade particle tolerance.

3.3 Closed-Loop Advantages

• Efficiency: >90% total efficiency (vs. 80–85% for open-loop systems).

• Compact Design: Integrates pump, control valve, and charge functions, minimizing piping.

• Four-Quadrant Operation: Supports forward/reverse rotation and regenerative braking (ideal for hybrid vehicles).

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