EFBG-06-500-C-5120 Yuken Proportional Flow Control Valve

Product Overview

The EFBG-03, EFBG-06-500-C-5120 and EFBG-10-500-C-11 belong to the Yuken EFBG series of proportional electro-hydraulic flow control and relief valves. These energy-saving load-sensing valves automatically adjust pump pressure according to actuator load while maintaining minimal differential pressure, significantly reducing system power consumption. Built-in temperature compensation ensures stable flow control independent of oil temperature. Fully interchangeable with original Yuken EFBG units, every valve undergoes 100% simulated operating-condition testing for consistent performance in demanding hydraulic systems requiring precise combined flow and pressure control.

Technical Specifications 

• Model: EFBG-03 / EFBG-06-500-C-5120 / EFBG-10-500-C-11 (series covers multiple flow ratings)
• Type: Proportional electro-hydraulic flow control and relief valve (sub-plate mounting)
• Maximum operating pressure: 24.5 MPa
• Maximum flow: EFBG-03 approx. 125 L/min (high-flow versions up to 250 L/min); EFBG-06 approx. 250–500 L/min; EFBG-10 approx. 500–1000 L/min
• Metered flow adjustment range: EFBG-03 1–125 L/min; EFBG-06 2.5–250 / 5–500 L/min; EFBG-10 5–500 L/min
• Minimum pilot pressure: approx. 1.5 MPa
• Flow control: Hysteresis ≤3–7%, repeatability ≤1%, differential pressure approx. 0.6–1.2 MPa
• Pressure control (C/H types): C type approx. 1.4–15.7 MPa; H type approx. 1.4–24.5 MPa
• Rated current (flow control): approx. 600–900 mA (depending on size)
• Coil resistance: approx. 10 Ω or 43.5 Ω (depending on series)
• Mounting: Sub-plate
• Weight: approx. 17–30+ kg depending on size

Key Technical Advantages

1. Energy-saving load-sensing design: Automatically follows load pressure and maintains minimal differential pressure, delivering significant power savings as a classic energy-efficient PQ valve.
2. Temperature-compensated high-precision flow control: Built-in temperature compensation ensures stable flow independent of oil temperature variations, with low hysteresis and high repeatability.
3. True interchangeability and combined control: Identical mounting dimensions and interfaces to original Yuken EFBG series enable direct drop-in replacement; simultaneously provides proportional flow and pressure control.
4. 100% functional verification under simulated conditions: Every unit is fully tested across flow-pressure-current characteristics before shipment, guaranteeing consistency and long-term reliability.

Application Areas

• Combined flow/pressure control on injection molding and die-casting machines
• Energy-saving circuits on hydraulic presses and forging equipment
• Proportional flow regulation on machine tools and machining centers
• Metallurgical and rolling mill systems
• Industrial hydraulic power units requiring load-sensing and precise flow control

Expert Maintenance Tips

Ensure the sub-plate mounting surface is clean and flat; tighten bolts to the specified torque. Pilot drain lines should return separately to tank at low pressure. Maintain fluid cleanliness at the appropriate ISO 4406 class to protect the proportional spool. Regularly check solenoid coil resistance and amplifier compatibility. If flow instability occurs, first inspect oil temperature, pilot pressure and fluid contamination. For long-term storage keep the valve filled with oil and cycle periodically. Always use original-specification seals when servicing.