EFBG-06-250A-C-20T145 | YUKEN Proportional Valve 250L/min 24.5MPa

Product Overview

The EFBG-06-250A-C-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 0.6–0.9 MPa (6–9 kgf/cm²) above the load pressure. This characteristic significantly reduces overflow losses and system heat generation, achieving substantial energy savings (system energy consumption reduced by over 30%). Additionally, the valve incorporates a temperature compensation function, ensuring stable flow control regardless of fluid temperature variations.

The EFBG-06-250A-C-20T145 features 06 size (NG10 / CETOP D05) , maximum metered flow of 250 L/min, C-type proportional pilot relief valve (pressure adjustment range 1.4–15.7 MPa), and 20T145 design series. The valve must be used with a dedicated YUKEN proportional amplifier (e.g., AMN series).

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

Technical Specifications (Bulleted List)

• Model: EFBG-06-250A-C-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%

• Pressure Adjustment Range (C-type): 1.4–15.7 MPa (14–157 kgf/cm²) 

• Pressure Hysteresis: ≤3%

• Pressure Repeatability: ≤1%

• Flow Control Rated Current: 750 mA

• Pressure Control Rated Current: 820 mA (C-type) 

• 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

• Recommended Cleanliness: NAS Class 7 or better, recommended 10 μm filtration

• Response Time: ＜20 ms

• Cycle Life: Over 10 million cycles

• Mass: Approx. 30 kg

Key Technical Advantages

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

The EFBG-06-250A-C-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 0.6–0.9 MPa (6–9 kgf/cm²) above the load pressure. This characteristic significantly reduces overflow losses, achieving over 30% energy savings, and effectively suppresses system temperature rise.

2. Dual Independent Proportional Flow and Pressure Control

The EFBG-06-250A-C-20T145 integrates flow control and pressure control (relief function) in a single valve, with two independent electrical signals controlling flow and pressure respectively for decoupled precision regulation. 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 and Pressure Compensation — Stable Flow Unaffected by Load or Temperature

The valve incorporates a built-in temperature compensation function, ensuring stable flow control regardless of fluid temperature variations. Combined with pressure compensation, flow remains unaffected by load pressure and oil temperature changes. Excellent low-speed stability with speed fluctuation ＜±2% ensures smooth operation at low speeds. Consistent performance across a wide oil temperature range of -20°C to 80°C.

4. High Precision with Low Hysteresis

Flow hysteresis ≤3% with repeatability ≤±1%; pressure hysteresis ≤3% with repeatability ≤±1%. Ensures high precision and repeatability in actuator speed and system pressure control.

5. 250 L/min High Flow Capacity

Delivers 250 L/min maximum flow capacity in an NG10 package. The metered flow adjustment range covers 2.5–250 L/min. The high-flow series (EFBG-06-500) achieves up to 500 L/min. Compact size with high flow reduces system volume and weight.

6. Fast Response and High Reliability

Response time ＜20 ms minimizes overshoot and ensures system dynamic stability. High contamination resistance with anti-contamination rating of NAS Class 7. Key components feature wear-resistant materials with cycle life exceeding 10 million cycles.

7. International Standard Compliance for High Installation Compatibility

Mounting conforms to CETOP D05 (NG10) standards. Fully compatible with globally adopted NG10 size interfaces. Must be used with a dedicated YUKEN proportional amplifier (e.g., AMN series).

Application Areas

• Injection Molding Machinery — Composite proportional control of injection speed and holding pressure

• Die-Casting Machines — Precise proportional regulation of clamping, injection speed, and pressure

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

• Metallurgical Equipment — Speed and pressure composite control for rolling mill hydraulic systems

• Marine Hydraulic Systems — Energy-saving control for deck machinery

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

• Test Benches and Servo Hydraulic Systems — High-precision control for dynamic loading and simulation

Expert Maintenance Tips

1. Installation Guidelines

• EFBG-06-250A-C-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.

• The independent large-diameter drain port must be routed separately back to the tank to avoid return line interference.

• 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.

• Pressure control rated current: 820 mA (C-type) .

• Coil resistance: 10 Ω.

3. Hydraulic Fluid Management

• Recommended cleanliness: NAS Class 7 or better, recommended 10 μm filtration.

• Working medium: ISO VG32–68 hydraulic oil.

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

• Minimum pilot pressure: 1.5 MPa.

4. Pressure Setting and Adjustment

• C-type pressure adjustment range: 1.4–15.7 MPa (14–157 kgf/cm²) .

• Pressure adjustment is performed via the proportional pilot relief valve—adjust gradually under system operating conditions.

• Factory-preset; refer to YUKEN technical documentation for adjustments.

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 pressure fluctuation occurs: First check fluid cleanliness and pilot screens for blockage.

• If slow response or reduced control precision occurs: Check proportional amplifier parameter settings and solenoid coil resistance.

• High contamination resistance: Key components feature special surface treatment with cycle life exceeding 10 million cycles.