Product Overview
The EFBG-03-60-H-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. Additionally, the valve incorporates a temperature compensation function, ensuring stable flow control regardless of fluid temperature variations.
The EFBG-03-60-H-20T145 features 03 size (NG10 / CETOP D05) , maximum metered flow of 60 L/min, H-type proportional pilot relief valve (pressure adjustment range 1.4–21 MPa), and 20T145 design series. The valve must be used with a dedicated YUKEN proportional amplifier.
Model Code Breakdown (EFBG-03-60-H-20T145):
EFB: Electro-Hydraulic Proportional Flow Control and Relief Valve
G: Subplate Mounting
03: Valve size 03 (NG10 / CETOP D05)
60: Maximum metered flow 60 L/min
H: Proportional pilot relief valve pressure grade — H-type (range 1.4–21 MPa)
20T145: Design/configuration code (20T = main design, 145 = minor variation; mounting dimensions unchanged)
Technical Specifications
Model: EFBG-03-60-H-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 (ISO 4401-05)
Maximum Operating Pressure: 24.5 MPa (250 kgf/cm² / 3550 PSI)
Maximum Flow: 60 L/min
Metered Flow Adjustment Range: 1–60 L/min
Minimum Pilot Pressure: 1.5 MPa
Pilot Flow: Steady 1 L/min / Transition 3 L/min
Differential Pressure: 0.6 MPa (6 kgf/cm²)
Flow Hysteresis: ≤3%
Flow Repeatability: ≤1%
Pressure Hysteresis: ≤3%
Pressure Repeatability: ≤1%
Pressure Adjustment Range (H-type): 1.4–21 MPa
Rated Current (Flow Control): 670 mA
Coil Resistance: 10 Ω
Supply Voltage: 24V DC
Mass: 16–20 kg
Control Signal: 0–10V DC / 4–20mA / PWM
Temperature Compensation: Built-in
Key Technical Advantages
1. Energy-Saving Meter-In Design — Significant Power Reduction
The EFBG series 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, minimizes system heat generation and power consumption—particularly suitable for long-running hydraulic systems.
2. Dual Proportional Flow and Pressure Control
The EFBG-03-60-H-20T145 integrates flow control and pressure control (relief function) in a single valve, with two independent electrical signals controlling flow and pressure respectively. 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% ; pressure hysteresis ≤3% with repeatability ≤±1%. Ensures high precision and repeatability in actuator speed and system pressure control, meeting the stringent requirements of injection molding machines, die-casting machines, and other precision equipment.
5. Wide Pressure Adjustment Range for Flexible Application
H-type pressure adjustment range covers 1.4–21 MPa (14–210 kgf/cm²) . From low-pressure precision control to medium-high pressure heavy-duty applications, the valve adapts flexibly. The series also offers C-type (1.4–14 MPa) pressure grades for diverse system requirements.
6. International Standard Compliance with 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 (e.g., EPC series).
Application Areas
Injection Molding Machinery — Composite proportional control of injection speed and holding pressure
Die-Casting Machines — Precise proportional regulation of injection speed and pressure
Hydraulic Presses and Forging Equipment — Stepless adjustment of slide speed and working pressure
Construction Machinery — High-flow proportional control for booms and swing mechanisms
Metallurgical Equipment — Speed and pressure composite control for rolling mill hydraulic systems
Marine and Offshore Engineering — Energy-saving control for deck machinery hydraulic systems
Expert Maintenance Tips
1. Installation Guidelines
EFBG-03-60-H-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 and causing spool sticking or seal damage.
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 DC / 4–20mA / PWM.
Rated current: 670 mA, coil resistance: 10 Ω.
3. Hydraulic Fluid Management
Recommended filtration: ≥25 μm.
Working medium: ISO VG32–68 hydraulic oil.
Operating temperature range: -10°C to +70°C, optimal 30–50°C.
Recommended inspection every 6 months — clean the valve body interior and replace seals.
4. Pressure Setting and Adjustment
H-type pressure adjustment range: 1.4–21 MPa (14–210 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.
The air vent should be positioned upward and fully vented to achieve stable pressure control.
