EFBG-03-160-C Yuken Proportional Valve 160 L/min 24.5 MPa

Product Overview

The EFBG-03-160-C series electro-hydraulic proportional relief and flow control valve (including model EFBG-03-160-H-21T233-L and the pilot valve EDG-01V-H-PNT13-61T) is manufactured to original YUKEN technical standards. Belonging to the EFBG series with size 03 (NG10 / CETOP 3 / ISO 4401-03), this valve is a high-performance electro-hydraulic proportional pressure and flow compound control valve. It features a subplate mounting design that integrates proportional relief valve and proportional flow valve functions into a single unit. Two independent electrical signals separately control system pressure and flow, enabling continuous, precise proportional regulation of actuator speed and pressure.

The EFBG-03-160-C features pressure adjustment range C (1.4 to 14 MPa) with a maximum adjustable flow of 160 L/min and maximum operating pressure of 24.5 MPa (3550 psi). The EDG-01V-H-PNT13-61T is a matching proportional pilot relief valve that employs a compact DC solenoid and direct-acting relief valve design. It serves as a pilot valve for low flow rate hydraulic systems, controlling pressure in proportion to the input current. The valve features an energy-saving design that automatically adjusts pump pressure according to load pressure, maintaining the pressure differential at a minimum of only 0.6 to 0.9 MPa, thereby reducing system energy consumption and fluid temperature rise.

This product is dimensionally and functionally identical to the original YUKEN EFBG-03-160 series valve, offering true drop-in interchangeability for direct replacement of same-specification OEM valves. Every unit undergoes 100% bench testing under simulated working conditions, including rated pressure holding, flow-signal linearity, pressure regulation characteristics, and internal leakage verification.

Technical Specifications (Bulleted List)

General Specifications

• Model: EFBG-03-160-C / EFBG-03-160-H-21T233-L

• Matching Pilot Valve: EDG-01V-H-PNT13-61T

• Product Series: EFBG-03 (Size 10 / NG10 / CETOP 3 / ISO 4401-03)

• Design: Electro-hydraulic proportional relief and flow control valve (pressure-flow compound control valve)

• Connection: Subplate mounting

• Installation Position: Any

Hydraulic Parameters

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

• Maximum Adjustable Flow: 160 L/min

• Flow Adjustment Range: 1 to 160 L/min

• Valve Pressure Differential: 0.6 MPa (6 kgf/cm²)

• Required Pilot Flow: 1 L/min steady state; 3 L/min transient

• Hydraulic Fluid: Mineral-based hydraulic oil

• Applicable Temperature: 20 to 60°C

Pressure Control Parameters (C Type)

• Pressure Adjustment Range: C type 1.4 to 14 MPa

• Rated Current: C type 890 mA

• Coil Resistance: 10 Ω

• Hysteresis: Less than 3%

• Repeatability: 1%

Flow Control Parameters

• Rated Current: 800 mA

• Coil Resistance: 10 Ω

• Hysteresis: Less than 7%

• Repeatability: 1%

Matching Pilot Valve EDG-01V-H-PNT13-61T Parameters

• Type: Proportional solenoid pilot relief valve

• Maximum Operating Pressure: 24.5 MPa (3550 psi)

• Minimum Flow Rate: 0.3 L/min

• Pressure Adjustment Range: H type 1.4 to 24.5 MPa

• Control: Proportional solenoid actuated, pressure proportional to input current

Materials & Construction

• Valve Body: High-strength cast steel

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard)

• Surface Treatment: Phosphating / anti-corrosion coating

Key Technical Advantages

1. Pressure-Flow Compound Control with Energy-Saving Design
The EFBG-03-160-C integrates proportional relief valve and proportional flow valve functions into a single unit, with two independent electrical signals separately controlling pressure and flow. The valve features an energy-saving design that automatically adjusts pump pressure according to load pressure, maintaining a pressure differential of only 0.6 to 0.9 MPa between pump and load, thereby minimizing system energy consumption and fluid temperature rise. The valve also features temperature compensation for stable flow control regardless of oil temperature variations.

2. High-Accuracy Closed-Loop Control with Fast Response
The valve employs a closed-loop control system with a compact proportional solenoid and linear position detector (LVD), achieving high-response, high-accuracy flow and pressure control. Pressure control hysteresis is less than 3%, flow control hysteresis is less than 7%, and repeatability is 1% for both. This enables precise control of actuator speed and output pressure, meeting the demanding requirements of injection molding machines for mold closing, injection, and holding processes.

3. Precision Spool Machining with Low Pressure Loss
The control spool is precision-ground from carburized steel with micron-level clearance control. All valve ports are CFD-optimized, significantly reducing pressure loss and enhancing system energy-saving benefits. The low valve pressure differential of 0.6 MPa further reduces system energy losses.

4. Strong Contamination Tolerance and Reliable Operation
The EFBG series valve features a rational structural design and strong anti-contamination performance, providing tolerance to particulate contamination for reliable operation in industrial field environments. The spool metering notches are optimized to maintain high-accuracy flow control while reducing the risk of spool binding caused by particulate contaminants.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every EFBG-03-160-C valve undergoes 100% bench testing prior to shipment, covering 24.5 MPa rated pressure holding, flow-signal linearity verification, pressure regulation characteristic calibration, and internal leakage measurement. Mounting dimensions, port positions, and performance curves are strictly matched to the original YUKEN valve, enabling direct drop-in replacement without modifying piping or control programs.

Application Areas

• Injection Molding Machines: Precise pressure and speed control for mold closing, injection, and holding processes; particularly suitable for energy-saving retrofits of injection molding machine hydraulic systems

• Hydraulic Presses: Proportional regulation of pressing speed and pressure

• Die Casting Machines: Precise control of shot speed and intensification pressure

• Hydraulic Power Units: Core regulating element in main control systems for precise control of actuator motion characteristics

• Automated Production Lines: Excellent performance in hydraulic transmission applications requiring frequent start-stop or speed changes

• Metallurgical Equipment: Precision control for continuous casting machines and rolling mill auxiliary hydraulic systems

• Construction Machinery: Pressure-flow compound control for small-to-medium hydraulic systems

Expert Maintenance Tips

Installation Guidelines

1. The EFBG-03-160-C series can be mounted in any position. Mounting surface flatness must be ≤ 0.05 mm. Tighten mounting bolts diagonally in stages to the specified torque value. The mounting surface conforms to ISO 4401-03 for matching with CETOP 3 standard subplates.

2. Thoroughly flush all piping circuits before installation. Ensure no welding slag, metal chips, or particulate contaminants remain. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes.

3. Air Bleeding: After installation, air must be bled from the pressure and flow solenoids. The installation posture must allow the air bleed valve to be rotated to the upward position. Set at approximately 1.5 MPa (15 kgf/cm²) during trial operation and bleed thoroughly to obtain stable pressure control.

4. Electrical connections must use the matching power amplifier to ensure control signal compatibility. Control signal cables should be shielded, with the shield grounded at one end.

Routine Maintenance Procedures

1. Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 19/17/14 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits.

2. Coil Resistance Verification: Measure solenoid coil resistance (standard value 10 Ω) every 1,000 operating hours. Replace the coil if deviation exceeds ± 10%.

3. Pressure Setting Verification: Periodically verify pressure adjustment range settings. The C-type valve pressure setting must not exceed 14 MPa. If pressure control becomes unstable, first check whether air bleeding is adequate and whether the pilot valve filter is clogged.

4. Safety Valve Setting: To prevent the preset pressure from becoming unstable, the safety valve setting should be 2 MPa (20.4 kgf/cm²) above the upper limit of the pressure adjustment range at the flow rate.

5. Seal Replacement: Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours. For high-temperature applications, reduce the interval to 2,000 hours.