EFBG-06-250-20T145 | YUKEN Flow Control Valve 250L/min 24.5MPa

Product Overview

The EFBG-06-250-20T145 is a classic model in the YUKEN EFBG series of proportional electro-hydraulic flow control and relief valves. This valve is an energy-saving meter-in type flow control valve that integrates flow control and pressure control (relief function) in a single unit, supplying only the minimum pressure and flow necessary for actuator drive.

The core design philosophy of the EFBG series is demand-based energy supply: the valve controls pump pressure by following the load pressure while keeping the differential pressure minimized—maintaining pump-side pressure only 0.7 MPa (7 kgf/cm²) above the load pressure. This characteristic significantly reduces overflow losses and system heat generation. Additionally, the valve incorporates a temperature compensation function, ensuring stable flow control regardless of fluid temperature variations.

The EFBG-06-250-20T145 features 06 size (NG10 / CETOP D05) , maximum metered flow of 250 L/min, and 20T145 design series. The valve must be used with a dedicated YUKEN proportional amplifier.

Model Code Breakdown (EFBG-06-250-20T145):

• EFB: Electro-Hydraulic Proportional Flow Control and Relief Valve

• G: Subplate Mounting

• 06: Valve size 06 (NG10 / CETOP D05)

• 250: Maximum metered flow 250 L/min

• 20T145: Design/configuration code (20T = main design, 145 = minor variation; mounting dimensions unchanged)

Technical Specifications (Bulleted List)

• Model: EFBG-06-250-20T145

• Brand: YUKEN

• Series: EFBG Series

• Product Type: Proportional Electro-Hydraulic Flow Control and Relief Valve

• Mounting Type: Subplate Mounting

• Mounting Standard: CETOP D05 / NG10

• Maximum Operating Pressure: 24.5 MPa (250 kgf/cm² / 3550 PSI) 

• Maximum Flow: 250 L/min

• Metered Flow Adjustment Range: 2.5–250 L/min

• Minimum Pilot Pressure: 1.5 MPa

• Pilot Flow: Steady 1 L/min / Transition 4 L/min

• Differential Pressure: 0.7 MPa (7 kgf/cm²) 

• Flow Hysteresis: ≤3%

• Flow Repeatability: ≤1%

• Flow Control Rated Current: 750 mA

• Coil Resistance: 10 Ω

• Supply Voltage: 24V DC

• Control Signal: 0–10V / 4–20mA

• Medium: ISO VG32–68 hydraulic oil

• Operating Temperature: -20°C to +80°C

• Ambient Temperature: 0°C to +50°C

• Temperature Compensation: Built-in

• Mass: Approx. 30 kg

Key Technical Advantages

1. Energy-Saving Meter-In Design — Significant Power Reduction

The EFBG-06-250-20T145 is an energy-saving meter-in type flow control valve that supplies only the minimum pressure and flow necessary for actuator drive. The valve maintains pump-side pressure only 0.7 MPa (7 kgf/cm²) above the load pressure. This characteristic significantly reduces overflow losses, minimizes system heat generation—particularly suitable for long-running hydraulic systems.

2. Dual Proportional Flow and Pressure Control

The EFBG-06-250-20T145 integrates flow control and pressure control (relief function) in a single valve. As a “flow-pressure composite proportional valve,” it enables precise stepless speed regulation of actuators while simultaneously providing system pressure setting and overload protection. One valve replaces what traditionally required two valves, significantly simplifying hydraulic system layout.

3. Built-in Temperature Compensation — Stable Flow Regardless of Oil Temperature

The valve incorporates a built-in temperature compensation function, ensuring stable flow control regardless of fluid temperature variations. This ensures consistent actuator speed across varying operating temperatures, improving machining precision and operational stability.

4. High Precision with Low Hysteresis

Flow hysteresis ≤3% with repeatability ≤±1%. Ensures high precision and repeatability in actuator speed control, meeting the stringent requirements of injection molding machines, die-casting machines, and other precision equipment.

5. 250 L/min High Flow Capacity

The EFBG-06-250-20T145 delivers 250 L/min maximum flow capacity in an NG10 package. The metered flow adjustment range covers 2.5–250 L/min—from low-speed precision feed to high-speed high-flow applications.

6. Shock-Free Start/Stop — Enhanced System Stability

The EFBG series enables shock-free starting, stopping, and speed changes of actuators. This optimizes system start/stop characteristics, reduces hydraulic shock damage to actuators and piping, and extends equipment service life.

7. International Standard Compliance for High Installation Compatibility

Mounting conforms to CETOP D05 (NG10) standards. Fully compatible with globally adopted NG10 size interfaces for direct replacement of same-series, same-specification products. Must be used with a dedicated YUKEN proportional amplifier.

Application Areas

• Injection Molding Machinery — Precise proportional control of injection speed

• Die-Casting Machines — Proportional regulation of injection speed

• Hydraulic Presses and Forging Equipment — Stepless adjustment of slide speed

• CNC Machine Tools — Speed control for rapid traverse and feed switching

• Metallurgical Equipment — Speed control for rolling mill hydraulic systems

• Construction Machinery — Proportional speed control for travel and working equipment

• Automotive Manufacturing Automation — Precise speed control for hydraulic actuators

Expert Maintenance Tips

1. Installation Guidelines

• EFBG-06-250-20T145 is subplate mounting — mounting surface must conform to CETOP D05 (NG10) standards.

• Vertical installation is recommended to ensure spool movement is not affected by gravity.

• Thoroughly clean the mounting surface and all ports (P, A, B, T) before installation to prevent foreign particles from entering the valve.

2. Electrical Requirements

• A dedicated YUKEN proportional amplifier is mandatory! PLC direct voltage output cannot drive the proportional solenoid—current amplification is required.

• Power supply: 24V DC.

• Control signals: 0–10V / 4–20mA.

• Flow control rated current: 750 mA.

• Coil resistance: 10 Ω.

3. Hydraulic Fluid Management

• Recommended cleanliness: ISO 18/15 or better, recommended 10 μm filtration.

• Working medium: ISO VG32–68 hydraulic oil.

• Operating temperature: -20°C to +80°C.

• Ambient temperature: 0°C to +50°C.

• Minimum pilot pressure: 1.5 MPa.

4. Pressure Setting and Adjustment

• This model is standard configuration (without proportional pilot relief valve) — maximum pressure is set by the system relief valve.

• For pressure control functionality, select C-type (1.4–15.7 MPa) or H-type (1.4–24.5 MPa) pressure grade models.

• Adjust gradually under system operating conditions to achieve the desired flow rate.

5. Periodic Maintenance and Troubleshooting

• Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.

• Check electrical connectors for looseness, oxidation, or moisture ingress.

• If flow instability or slow response occurs: First check fluid cleanliness and pilot screens for blockage.

• Periodically check pilot oil circuit for blockage, ensuring pilot pressure remains above 1.5 MPa.