Daikin VDS Series Variable Vane Pump | VDS-0B-1A2-U-1249L VDS-0A-1A3 | Hydraulic Vane Pump

The VDS Series variable displacement vane pumps by Chengyuan Hydraulic are compact, high-efficiency power units designed for low energy consumption and ultra-quiet operation. Fully compatible with Daikin technical standards, these pumps offer 100% original-place interchangeability. The VDS series utilizes a pressure-compensated control mechanism that automatically adjusts flow based on system demand. Once the preset pressure is reached, the pump shifts to a near-zero flow output (deadhead), significantly reducing heat generation and power loss. Each VDS pump undergoes 100% simulated condition testing, ensuring rapid response times and exceptional stability for precision machine tools and automated production lines.

Technical Specifications :

• Model Representative: VDS-0B-1A2-U-1249L, VDS-0B-1A1-U-10, VDS-0A-1A3-10

• Displacement: $8\text{ cm}^3\text{/rev}$ (0A size) / $15\text{ cm}^3\text{/rev}$ (0B size)

• Max Operating Pressure: $7\text{ MPa (70 bar / 1015 psi)}$

• Pressure Adjustment Ranges:

  • 1A1: $0.8\text{–}1.5\text{ MPa}$

  • 1A2: $1.5\text{–}4.0\text{ MPa}$

  • 1A3: $3.5\text{–}7.0\text{ MPa}$

• Speed Range: $800\text{–}1800\text{ rpm}$

• Control Type: A (Pressure Compensated Control)

• Weight: Approx. $4.5\text{–}5.5\text{ kg}$ (Ultra-compact design)

Key Technical Advantages:

• Ultra-Low Noise Operation: Specifically engineered to address vane pump noise, the VDS series features optimized vane-to-stator contact geometry. Even under full pressure deadhead conditions ($7\text{ MPa}$), noise levels remain exceptionally low, ideal for indoor machine tool environments.

• High-Sensitivity Pressure Compensation: The integrated precision spring compensator allows the stator eccentricity to reset to center within milliseconds once the target pressure is hit. This eliminates unnecessary relief loss and suppresses fluid temperature rise.

• Axial Balance for High Efficiency: The side plates utilize a hydraulic axial balance design, which minimizes vane end-face wear and maintains peak volumetric efficiency across the entire pressure range. Tested service life is $30\%$ longer than standard variable vane pumps.

• Extremely Compact Footprint: The VDS series is among the smallest variable displacement pumps in its class. Featuring high-strength die-cast aluminum covers and an integrated rotor shaft, it allows for easy integration into space-constrained Hydraulic Power Units (HPUs).

Application Areas:

• Precision Machine Tools: Grinders, lathes, and hydraulic clamping circuits.

• Automation Lines: Small-scale hydraulic stations and electronic assembly presses.

• Light Industrial Machinery: Shoemaking machinery and leather cutting equipment.

Expert Maintenance Tips:

• Pressure Adjustment: To adjust pressure, loosen the locknut and turn the adjustment bolt clockwise to increase pressure or counter-clockwise to decrease. Avoid running the pump above the model’s rated limit (e.g., 1A2 limit).

• Temperature Management: For optimal compensator sensitivity, maintain oil temperature between $15\text{–}60\text{°C}$. Excessive heat increases internal leakage and compromises pressure compensation accuracy.

• Air Bleeding: During initial startup or after an oil change, jog the motor under no-load conditions to bleed air. If the pump starts at maximum eccentricity with air in the cavity, it can cause vane impact damage.