A11VO Series Control Valves
4 month ago
Product details
A11VO Series LRDU2 Control Valve: Detailed Overview
TheA11VO seriesis a line of axial piston variable-displacement pumps developed byBosch Rexroth, widely used in construction machinery and industrial hydraulic systems. Among them, theLRDU2is a typical control valve model designed forload-sensing (LS) and constant-power control, offering advanced functionality for complex hydraulic applications. Below is a detailed breakdown of its technical features, applications, and model specifications.
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I. Technical Features
1. Load-Sensing Control (LS)
• Function: Automatically adjusts pump displacement by sensing system load pressure, ensuring output flow matches load demand and minimizing energy waste.
• Advantages: Improves system efficiency by over 20%, ideal for multi-actuator parallel systems (e.g., concrete pump trucks, excavators).
• Implementation: Integrates a pressure compensator in the valve body to dynamically regulate swashplate angle by comparing load pressure with pump outlet pressure.
2. Constant-Power Control
• Function: Limits pump input power to prevent motor/engine overload. Reduces displacement when system pressure rises to maintain constant power.
• Advantages: Protects power sources and extends equipment lifespan, suitable for power-constrained mobile devices (e.g., cranes, road rollers).
• Implementation: Controls maximum swashplate tilt via a balance between spring force and hydraulic signals.
3. Hybrid Control Logic
• Combines load-sensing and constant-power modes, prioritizing load demand while switching to power control near pressure limits for efficiency and safety.
4. High Precision & Reliability
• Materials: Valve body made of high-strength cast iron; critical components (swashplate, pistons) use bearing steel or special alloys for 50% higher wear resistance.
• Seals: Fluororubber (FKM) or hydrogenated nitrile rubber (HNBR) seals ensure operation from -20°C to +80°C.
• Lifespan: MTBF (Mean Time Between Failures) exceeds 25,000 hours, meeting industrial-grade continuous operation requirements.
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II. Applications
1. Construction Machinery
• Concrete Pump Trucks: Controls main pumps for precise boom movement and energy-efficient operation.
• Excavators: Ensures proportional flow distribution during simultaneous swing and travel motions via load-sensing.
• Cranes: Prevents motor overload during luffing/hoisting with constant-power control.
2. Industrial Equipment
• Aluminum Extrusion Presses: High-precision pressure control reduces scrap rates.
• Ceramic Presses: Load-sensing adapts to varying mold flow demands, shortening mold-change times.
3. Harsh Environments
• Coal Mine Roadheaders: Explosion-proof LRDU2 variants (e.g., A11VO60LRDU2) withstand dust and vibration.
• Cold-Start Applications: Optional pre-heating units support -30°C startup (e.g., A11VO145LRDU2).
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III. Typical Model & Specifications
Example:A11VO145LRDU2/10R-NZD12K02
• Displacement: 145 cm³/rev
• Rated Pressure: 35 MPa (peak 40 MPa)
• Control Type: Hybrid load-sensing + constant-power
• Mounting: Flange-type (SAE/ISO standard interfaces)
• Fluid: Mineral-based hydraulic oil (ISO VG32–VG68)
• Weight: ~95 kg (including charge pump)
• Applications: Sany SY550H excavator main pump, Zoomlion ZLJ5440THB concrete pump truck.
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IV. Selection Guidelines
1. Displacement Matching: Choose based on system flow requirements (e.g., A11VO95, A11VO130, A11VO190).
2. Pressure Rating: Ensure system peak pressure ≤ pump’s rated value (typically 35 MPa).
3. Control Function:
• Single LS demand: Opt for LRDS models (e.g., A11VO130LRDS).
• Electro-proportional control: Select EP2D variants (e.g., A11VO145EP2D).
4. Environmental Adaptability: Use special coatings/seals for high-temperature or corrosive environments.
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V. Maintenance & Troubleshooting
1. Routine Care:
• Replace hydraulic oil and filters every 1,000 hours (use ISO 46/68 anti-wear oil).
• Inspect charge pump to prevent cavitation-induced wear.
2. Common Issues:
• Flow Instability: Check for stuck LS valve spools; clean/replace filters.
• Low Pressure: Inspect constant-power spring integrity or compensator seal leaks.
• Excessive Noise: Verify oil cleanliness (NAS ≤ 9) and check for bearing damage.
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