VCM-DF30D VCM-DF40B Variable Displacement Double Vane Pump | Yuken Interchangeable | High Efficiency

The VCM Series variable displacement vane pumps by Chengyuan Hydraulic are engineered to deliver high energy efficiency and precise flow control for modern hydraulic systems. This versatile series includes single pumps (SF), double pumps (DF), and specialized tandem combinations (SF+EGA). Designed for 100% original-place interchangeability with leading Japanese brands like Yuken and Nachi, our VCM pumps feature an advanced pressure compensation mechanism that adjusts flow based on load demand. This significantly reduces power consumption and heat generation. Every unit undergoes 100% simulated condition testing to guarantee ultra-low noise levels and robust reliability in demanding industrial environments.

Technical Specifications 

• Model Series: VCM-SF (Single) / VCM-DF (Double) / VCM-SF+EGA (Combination)

• Displacement Codes: 30 (approx. $15.8\text{–}20\text{ cm}^3\text{/rev}$) / 40 (approx. $20\text{–}26\text{ cm}^3\text{/rev}$)

• Pressure Adjustment Ranges:

  • Code A: $0.8\text{–}1.4\text{ MPa}$

  • Code B: $1.4\text{–}3.5\text{ MPa}$

  • Code C: $3.5\text{–}5.5\text{ MPa}$

  • Code D: $5.5\text{–}7.0\text{ MPa}$

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

• Max Operating Pressure: $7.0\text{ MPa (70 bar)}$

• EGA Gear Pump Attachment: $6.2\text{ cc/rev}$ (for auxiliary cooling or lubrication)

• Control Type: Pressure Compensated Variable Control

• Efficiency: Volumetric Efficiency $\ge 90\%$

Key Technical Advantages

• Pressure-Compensated Efficiency: The integrated high-sensitivity spring and cam ring allow the pump to reduce displacement automatically once the preset pressure is reached. This prevents energy waste and keeps the system oil temperature stable.

• Low Noise Acoustic Engineering: Featuring precision-ground vanes and optimized fluid channels, the VCM series operates with minimal vibration. The noise level remains significantly below industry averages, even at a peak pressure of $7.0\text{ MPa}$.

• High-Durability Rotor Components: Rotors and stators are crafted from high-chromium alloy steel with deep carburizing heat treatment. This ensures exceptional wear resistance and maintains high volumetric efficiency throughout the pump’s service life.

• Compact Tandem Design (DF Series): Double pump configurations (e.g., DF30D-30D) allow for independent circuit control within a single housing, saving space and simplifying plumbing for complex machinery.

Application Areas

• Machine Tools: Clamping, tool changing, and auxiliary circuits for CNC lathes and milling machines.

• Light Industrial Machinery: Shoe-making machines, leather cutting units, and automated packaging lines.

• Automation HPUs: Power sources for woodworking machinery and low-pressure automation stations.

Expert Maintenance Tips

• Initial Priming & Air Bleeding: Before the first start, fill the pump housing with clean hydraulic oil through the drain port. Jog the motor to ensure air is fully exhausted to prevent cavitation damage.

• Independent Drain Line: The VCM series requires an external drain line connected directly to the reservoir. Ensure the line is large enough to keep backpressure below $0.03\text{ MPa}$ to protect the shaft seal.

• Fluid Cleanliness: Variable vane pumps are sensitive to contaminants. Maintain oil cleanliness at NAS Class 10 or better and ensure operating temperatures stay within the optimal $15\text{°C}$ to $60\text{°C}$ range.