Vickers KBFDG4V-3 KBFDG4V-5 Proportional Valve | Integrated Electronics | KBFDG4V-3-33C20N-Z-M1-PH7-H7-11

LIC Hydraulic presents the Vickers KBFDG4V Series, the premier solution for high-dynamic proportional control. These valves, including the KBFDG4V-3 (NG6) and KBFDG4V-5 (NG10), represent the bridge between standard proportional valves and high-end servo valves. Featuring Integrated Electronics (OBE) and an LVDT (Linear Variable Differential Transformer) for spool position feedback, the KBFDG4V series ensures that the spool position precisely follows the command signal regardless of flow forces or fluid viscosity changes. The model KBFDG4V-3-33C20N-Z-M1-PH7-H7-11 is widely recognized for its ultra-low hysteresis and superior repeatability in closed-loop motion control systems.

Technical Specifications (Bulleted List)

• Series: KBFDG4V (Proportional Directional Valve with OBE & Feedback)

• Sizes: NG6 (ISO 4401-03) and NG10 (ISO 4401-05)

• Control Type: Integrated On-Board Electronics (Analog or Fieldbus options)

• Feedback: Spool position LVDT for closed-loop accuracy.

• Supply Voltage: $24\text{ VDC}$ ($18\text{V}$ to $36\text{V}$ range)

• Command Signal: $\pm 10\text{V}$ or $4\text{–}20\text{mA}$ options.

• Hysteresis: $< 0.1\%$ of total stroke.

Key Technical Advantages

• Servo-Class Dynamics: High frequency response allows for high-speed switching and precise path following in automated hydraulic axes.

• Calibration-Free Setup: The OBE is factory-matched to the valve’s mechanical characteristics, ensuring optimal performance right out of the box without manual gain adjustments.

• Robust EMC Protection: The integrated housing protects the sensitive electronics from electromagnetic interference and harsh industrial environments.

• Precision Fluid Metering: Hardened and ground spools with precisely machined notches provide linear flow control and excellent metering characteristics across the full range of movement.

Application Areas

• Plastic & Rubber Processing: Precise injection speed and pressure profile control in molding machines.

• Test Rigs: Dynamic load simulation and component fatigue testing.

• Steel Mills: Control of rolling mill gap settings and strip guiding systems.

• Aerospace Manufacturing: High-precision fixture positioning and component forming.

Expert Maintenance Tips

• Cable Integrity: Use only high-quality 7-pin or 12-pin connectors. Ensure the cabling is routed away from high-voltage motor lines to avoid signal noise.

• Filtration is Critical: Proportional valves with LVDT feedback have extremely tight tolerances. A failure to maintain oil cleanliness will lead to “stiction” or LVDT signal errors.

• Thermal Management: If operating at high duty cycles, ensure the manifold has adequate cooling. Excessive heat can drift the electronic components in the OBE, leading to accuracy loss.

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