Vickers KDG4V3 KDG5V5 KDG5V7 Proportional Valves | KDG4V32C28SZMUH760 | KDG5V8NXMUH110

LIC Hydraulic proudly presents the Vickers KDG Series, the industry standard for precision proportional directional control. Available in direct-operated (KDG4V-3) and pilot-operated (KDG5V-5/7/8) versions, these valves offer seamless integration of hydraulic power and electronic control. The hallmark of the KDG series is the integrated LVDT feedback (MUH code), which provides closed-loop spool position monitoring. This eliminates hysteresis and ensures that your system achieves repeatable, linear flow control. Our KDG valves provide 100% original interchangeability and are 100% dynamically tested for response time and leakage.

Technical Specifications (Bulleted List)

• Series: KDG4V (Direct), KDG5V (Pilot)

• Key Part Numbers: KDG4V32C28SZMUH760, KDG5V533C80NXMUH110, KDG5V72C180N100EVMUH110

• Operating Pressure: Up to $315\text{ bar}$ ($4500\text{ PSI}$)

• Flow Capacity: From $38\text{ L/min}$ (Size 03) up to $300\text{ L/min}$ (Size 07)

• Feedback Mechanism: Integrated LVDT (Linear Variable Differential Transformer)

• Mounting Interface: ISO 4401 (NG6, NG10, NG16)

• Seals: FKM (Viton) standard for chemical and thermal resistance

Key Technical Advantages

• Closed-Loop Precision: The MUH electronic feedback corrects spool position in real-time, delivering superior accuracy compared to standard proportional valves without feedback.

• Low Hysteresis: Advanced machining and electronic compensation reduce hysteresis to less than $0.5\%$, allowing for ultra-fine movements in synchronized systems.

• Fail-Safe Center Options: Multiple spool configurations (e.g., 2C, 33C) allow the system to default to a safe state in the event of power loss.

• High Dynamic Bandwidth: Optimized for rapid signal changes, making these valves suitable for high-frequency fatigue testing and high-speed production cycles.

Application Areas

• Metal Forming: Synchronized cylinder control for CNC press brakes and deep-drawing presses.

• Plastic Processing: Precision speed and pressure control for injection and blow molding.

• Industrial Automation: Position control for material handling robots and heavy-duty stage hydraulics.

• Testing Rigs: Dynamic load simulation for aerospace and automotive components.

Expert Maintenance Tips

• Filtration Integrity: Maintaining an ISO 4406 17/15/12 cleanliness level is mandatory. Particle ingress is the #1 cause of LVDT spool stiction and control instability.

• Signal Shielding: Use high-quality shielded twisted-pair cables for the feedback signal to prevent electromagnetic interference (EMI) from noisy industrial environments.

• Amplifier Calibration: Ensure the “Gain” and “Deadband” settings on the proportional amplifier are correctly tuned to the specific valve serial parameters for optimal performance.