Vickers KCG Series Proportional Relief Valve | KCG-3 KCG-6 | Hydraulic Solenoid Control

Chengyuan Hydraulic provides high-precision KCG Series proportional relief valves, engineered to meet the stringent standards of Vickers (Eaton). These electro-hydraulic components are essential for the remote, stepless regulation of system pressure proportional to an electrical input signal. Focusing on core models like KCG-3-L250D and KCG-6-W250, Chengyuan guarantees 100% Drop-in Interchangeability regarding mounting patterns (ISO 4401 compliant) and electrical configurations. Backed by our 100% Simulation Load Testing, every KCG valve is verified for hysteresis, repeatability, and step response before shipment. This ensures superior control stability for injection molding machines, presses, and various automated production lines.

Technical Specifications 

• Series Category: KCG-3 (NG6) / KCG-6 (NG10)

• Max Operating Pressure: Up to 315 bar

• Pressure Adjustment Ranges: 0-160 bar / 0-250 bar (Codes 160D/250D)

• Max Flow Rate: KCG-3 approx. 5 L/min (Pilot) / KCG-6 up to 40 L/min

• Rated Current: 1.5A / 1.6A (Coil dependent)

• Hysteresis: < 3% (with optimized amplifier)

• Repeatability: < ±1%

• Control Voltage: 24V DC

• Electrical Connection: H1 (DIN 43650 Connector)

• Seal Materials: NBR (Standard) or FKM (Viton)

Key Technical Advantages:

• High-Linearity Solenoids: Equipped with proportional solenoids optimized for hydraulic applications, ensuring a strict linear relationship between input current and output pressure. This provides smooth regulation and eliminates sudden pressure spikes.

• Compensated Spool Design: The internal spool is precision-ground and hardened. Specialized damping features effectively suppress vibrations caused by hydraulic shocks, maintaining low-noise operation during high-pressure transitions.

• Superior Volumetric Efficiency: The seat sealing utilizes high-grade alloy steel with a lapping process, minimizing pilot flow loss. This enhances control precision while reducing oil heat generation.

• Robust Environment Resistance: The valve body is treated with a corrosion-resistant black coating, and the fully encapsulated coil offers IP65 protection, ensuring long-term reliability in humid or dusty industrial settings.

Application Areas:

• Die-Casting & Machine Tools: Precise proportional control of clamping, injection, and cutting feed pressures.

• Marine Hydraulics: Remote pressure management for steering systems and deck machinery.

• Molding Machinery: Accurate pressure profile fitting for rubber and plastic injection molding.

• General Industry: Load simulation for hydraulic component test rigs.

Expert Maintenance Tips:

• Amplifier Matching: KCG series valves must be driven by dedicated proportional amplifiers (e.g., EEA-PAM series). Incorrect current may lead to sluggish response or solenoid burnout.

• Pilot Filtration Protection: These valves are highly sensitive to contamination. System filtration of at least 10μm is recommended to maintain oil cleanliness at NAS Class 9 or better.

• Air Bleeding: After installation, loosen the air bleed screw at the end of the solenoid until a continuous flow of oil appears without bubbles. This ensures consistent control response.