Product Overview
The EFBG-03-125 is a proportional electro-hydraulic flow control valve with integrated relief function from Yuken’s 10Ω–10Ω series. This energy-saving valve supplies the minimum pressure and flow necessary for actuator drive by following the load pressure while maintaining minimized differential pressure.
As a direct OEM-replacement solution, this valve maintains 100% mechanical and functional interchangeability with the original Yuken unit. Every valve undergoes rigorous simulation testing—including pressure cycling, thermal variation, and full-stroke endurance validation—to guarantee factory-grade performance. The built-in temperature compensation function ensures consistent flow control regardless of fluid temperature variations. Ideal for hydraulic systems demanding both energy efficiency and precise flow regulation.
Technical Specifications
EFBG-03-125 – Flow Control:
Model: EFBG-03-125
Brand: Yuken
Valve Type: Proportional electro-hydraulic flow control valve (with pilot relief function)
Mounting Type: Sub-plate mounting
Valve Size: 03
Max. Operating Pressure: 24.5 MPa (250 kgf/cm²)
Max. Flow: 125 L/min
Metered Flow Adjustment Range: 1 – 125 L/min
Min. Pilot Pressure: 1.5 MPa
Pilot Flow (Normal): 1 L/min
Pilot Flow (Transition): 3 L/min
Rated Current: 800 mA
Coil Resistance: 10 Ω
Differential Pressure: 0.7 MPa
Hysteresis: 3% or less
Repeatability: 1% or less
Temperature Compensation: Built-in
Mass: Refer to dimension drawing
EFBG-03-125 – Pressure Control:
Note: Specifications below apply to models with proportional pilot relief valve (e.g., EFBG-03-125-C-15)
Pressure Adjustment Range: C-type: 1.4 – 15.7 MPa; H-type: 1.4 – 24.5 MPa
Rated Current: C-type: 890 mA; H-type: 930 mA
Coil Resistance: 10 Ω
Hysteresis: 3% or less
Repeatability: 1% or less
Key Technical Advantages
1. Energy-Saving Design for Significant Power Reduction
The EFBG-03-125 automatically regulates pump output pressure and flow by following load pressure while maintaining a minimal differential pressure of only 0.7 MPa. This “supply-on-demand” control strategy substantially reduces overflow and throttling losses, delivering remarkable energy savings.
2. Built-in Temperature Compensation for Consistent Flow Across All Temperatures
An integrated temperature compensation mechanism automatically adjusts for viscosity variations caused by fluid temperature changes. Whether during cold-start low-temperature conditions or continuous operation at elevated temperatures, the set flow rate remains stable, ensuring consistent control accuracy.
3. High Repeatability and Low Hysteresis for Superior Control Quality
Flow control repeatability reaches 1% or less, with hysteresis maintained at 3% or less. This performance ensures consistent and predictable output flow during repeated adjustments—critical for automated processes requiring strict positioning repeatability.
4. Integrated Pilot Relief and Flow Control – Simplified System Design
The EFBG-03-125 integrates both proportional flow control and pilot relief valve functions within a single valve body. This integrated design eliminates the need for external pilot relief valves, simplifies hydraulic circuit layout, and reduces both system cost and potential failure points.
5. Drop-In Interchangeability – Minimized Downtime and Retrofit Costs
The valve strictly adheres to Yuken’s original mounting dimensions and functional specifications, with sub-plate mounting configuration. Whether for new system design or legacy system upgrades, this valve offers 100% mechanical and electrical interchangeability with the original Yuken unit—eliminating the need for manifold modifications or piping changes, significantly reducing downtime and retrofit expenses.
Application Areas
Injection Molding Machinery – Multi-stage proportional control of injection speed and holding pressure
Hydraulic Presses – Closed-loop control of slide velocity and pressure
Machine Tool Hydraulic Systems – Precision stepless adjustment of feed rates
Metallurgical Equipment – Proportional flow and pressure control in rolling mill hydraulic systems
Mobile Equipment – Proportional speed control and load-sensing control for work attachments
Energy Retrofit Projects – Replacing traditional throttling speed control schemes to improve system efficiency
Expert Maintenance Tips
1. Fluid Cleanliness Management
EFBG series proportional valves are highly sensitive to fluid contamination. Maintain system fluid cleanliness to ISO 4406 16/14/11 or better. The spool-to-sleeve clearance is extremely tight (less than 0.008 mm)—even minor contaminants can cause spool sticking. Install filters with a minimum rating of 10μm upstream of the valve.
2. Pilot Pressure Supply
The EFBG-03-125 requires a stable pilot pressure supply (minimum 1.5 MPa). Ensure adequate pilot flow is available; insufficient pilot pressure may result in incomplete main spool shifting or degraded flow control accuracy.
3. Electrical Connections and Signal Matching
The valve features a 10 Ω coil with a rated current of 800 mA (flow control section). Prior to installation, verify that the配套 driver amplifier output parameters match the valve’s electrical specifications. Use shielded cables for control signal transmission with reliable single-point grounding to effectively suppress electromagnetic interference.
4. Mounting Orientation and Port Connections
Ensure the mounting surface is flat and smooth during sub-plate installation, and tighten mounting bolts evenly to specified torque. Correctly identify and connect the pilot ports (internal pilot vs. external pilot)—incorrect pilot connection will prevent the valve from functioning properly.
5. Periodic Inspection and Maintenance
Regularly verify the valve’s flow-current characteristic curve. If increased hysteresis or reduced repeatability is detected, inspect the pilot valve filter element condition and clean or replace as necessary. For systems that have been idle for extended periods, perform thorough system circulation filtration before restart to ensure fluid cleanliness meets requirements.
