Daikin VDN & VDR Series Vane Pump | VDN-1B-2A3-20 | VDN-1B-1A3 1A4 2A4

LIC Hydraulic is a specialized provider of the Daikin VDN & VDR Series, the industry benchmark for silent and energy-efficient variable displacement vane pumps. Engineered with a sophisticated pressure-compensation mechanism, models like the VDN-1B-2A3-20 dynamically adjust their output to match system demand. This eliminates energy waste during idling and holding phases, making it an eco-friendly heart for modern hydraulic circuits. With its reputation for ultra-low noise and high responsiveness, the VDN series is essential for precision machinery requiring a stable and quiet power source.

Technical Specifications (Bulleted List)

• Series: Daikin VDN / VDR (Variable Displacement Vane).

• Pressure Range: 1A ($0.8\text{–}7.0\text{ MPa}$) and 2A ($1.5\text{–}14.0\text{ MPa}$).

• Standard Speed: $1000\text{–}1800\text{ RPM}$.

• Noise Level: Exceptionally low, typically under $60\text{ dB(A)}$ at full load.

• Design Number: 20 (Latest sequence for enhanced reliability).

• Control Type: Pressure compensation with flow adjustment.

Key Technical Advantages

• High Volumetric Efficiency: The axial pressure balance system minimizes internal slippage, maintaining consistent flow even at peak operating pressures.

• Fast Response Times: Rapid transition between maximum flow and zero flow helps prevent pressure spikes and protects sensitive downstream components.

• Compact Footprint: Optimized for space-constrained industrial machines, offering high power density in a small housing.

• Quiet Operation: Advanced port plate and vane geometry eliminate the “whine” typical of high-pressure pumps, improving the work environment for machine operators.

Application Areas

• Precision CNC Machinery: Providing reliable power for tool changers, spindles, and clamping.

• Industrial HPUs: Centralized hydraulic systems for clean-room manufacturing and laboratory equipment.

• Automated Presses: Driving high-cycle sequences in small-scale stamping and forming operations.

Expert Maintenance Tips

• Case Drain Management: Ensure the drain line is sufficiently large and free of restrictions. High backpressure in the pump case will impede the variable mechanism and may cause shaft seal leaks.

• Initial Priming: Before the first run, fill the pump housing with clean, filtered hydraulic oil through the drain port. This protects the internal vanes and cam ring from dry-run scoring.

• Filtration Standard: To maintain the precision 20-series internal tolerances, use a high-quality filter with a rating of $10\text{ microns}$ or better. Contaminants are the primary cause of sluggish pressure compensation.