Control valve A4VTG90HWC
2 month ago
Product details
LRDU2 valve A11VLO190/260
LRDS valve A11VO130-145
I. Model Breakdown
• A11VLO:
Rexroth variable displacement axial piston pump series code, indicating aswashplate-type axial piston pumpwith support for pressure, flow, or power control.
• 130:
Displacement specification (unit: cm³/rev), meaning the pump delivers130 cm³ of hydraulic oil per revolution, suitable for medium-to-high flow demands.
• LRDU2:
Control method and feature combination code, with the following meanings:
• L:Load Sensing Control, automatically adjusting output pressure based on system load demands.
• R:Remote Pressure Control, enabling external signal-based pressure regulation.
• D:Bidirectional Rotation, allowing the pump to operate in both forward and reverse directions.
• U2:Electro-Hydraulic Proportional Control, achieving stepless displacement or pressure adjustment via electrical signals (e.g., 0-10V or 4-20mA).
II. Performance Features
1. Load Sensing Control (L):
• Matches system load demands automatically, reducing energy waste and improving efficiency.
• Ideal for multi-actuator parallel systems to avoid pressure conflicts.
2. Remote Pressure Control (R):
• Supports external pressure sensor or proportional valve integration for flexible pressure adjustment.
3. Bidirectional Rotation (D):
• Enables forward/reverse pump operation, suitable for applications requiring directional changes (e.g., crane slewing mechanisms).
4. Electro-Hydraulic Proportional Control (U2):
• Achieves precise displacement or pressure regulation (accuracy ±1%) via proportional solenoids.
5. High-Pressure Performance:
• Rated pressure up to350 bar, peak pressure400 bar, meeting heavy-duty operational requirements.
6. High Reliability:
• Features high-strength bearings and wear-resistant piston pairs for extended service life and reduced maintenance.
III. Applications
1. Construction Machinery:
• Excavators, cranes, concrete pump trucks, and other equipment requiring precise pressure control and bidirectional rotation.
2. Industrial Automation:
• Injection molding machines, die-casting machines, and metal forming presses demanding dynamic flow/pressure adjustments.
3. Marine & Offshore Engineering:
• Steering gear systems and deck machinery requiring high-pressure, large-flow control.
4. Energy & Metallurgy:
• Rolling mill hydraulic systems and wind turbine pitch control mechanisms.
IV. Selection Guidelines
1. Displacement Matching:
• Calculate system flow requirements (Q=V×n Q = V \times n Q=V×n, whereQ Q Q= flow,V V V= displacement,n n n= speed) to confirm if 130 cm³/rev is suitable.
2. Pressure Requirements:
• Ensure system operating pressure stays within the pump’s rated range (350 bar).
3. Control Method:
• Choose U2 for electrical signal control; consider alternative models (e.g., LRDU1) for pure hydraulic control.
4. Environmental Adaptability:
• Select based on operating temperature (-20°C to +80°C) and fluid cleanliness (recommended NAS 6-8).
V. Maintenance & Troubleshooting
1. Routine Inspections:
• Fluid Cleanliness: Replace filters regularly to prevent contaminants from entering the pump.
• Oil Temperature: Monitor optimal range (40-60°C); excessive heat or cold degrades performance.
• Leakage Checks: Inspect shaft seals and end covers for oil leaks.
2. Common Faults & Solutions:
• Insufficient Flow:
• Causes: Clogged suction filter, internal pump wear, or proportional valve failure.
• Solutions: Clean/replace filters, inspect pump wear, and recalibrate the proportional valve.
• Pressure Fluctuations:
• Causes: Unstable load sensing signals or incorrect relief valve settings.
• Solutions: Verify pressure sensor signals and reset relief valve pressure.
• Abnormal Noise:
• Causes: Misaligned coupling, air entrainment, or bearing damage.
• Solutions: Realign coupling, perform air bleeding, and replace bearings.
3. Maintenance Recommendations:
• Drain oil and apply anti-rust coating during long-term storage to prevent internal corrosion.
• Use Rexroth-recommended hydraulic fluids (e.g., HD series) for oil replacement.
VI. Comparison with Similar Products
• A11VLO vs. A4VG:
• A11VLO emphasizes load sensing and electro-hydraulic proportional control for high dynamic response systems; A4VG offers a more compact design for space-constrained applications.
• U2 Control vs. Other Controls:
• U2 provides closed-loop control via electrical signals for higher precision than manual adjustments (e.g., LRDU1), albeit at a higher cost.
VII. Precautions
1. No Dry Running:
• Avoid operating without oil to prevent severe pump wear or failure.
2. Electrical Signal Compatibility:
• Ensure proportional control signals match the pump’s input range (e.g., 0-10V) to prevent signal distortion.
3. Alignment:
• Maintain pump-motor shaft alignment within ≤0.05mm to minimize vibration and noise.
4. Explosion-Proof Requirements:
• Select explosion-proof solenoids for hazardous environments.
For detailed technical parameters (e.g., torque curves, efficiency charts) or selection support, contact Rexroth directly or consult authorized distributors for product manuals.
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