EDFHG-04-140-3C40-XY-31T Yuken Proportional Valve 250bar

Product Overview

Models such as EDFHG-04-140-3C40-XY-31T and EDFHG-04-140-3C40-XY-E-30T belong to the Yuken EDFHG series of electro-hydraulic proportional directional and flow control valves. Featuring a two-stage design (pilot proportional reducing valve + main stage), they enable simultaneous direction and flow control via dual proportional solenoids. Every unit undergoes rigorous 100% simulated operating-condition testing and offers excellent drop-in interchangeability with equivalent proportional valves. High-precision response and low hysteresis allow a single valve to handle speed, acceleration/deceleration and directional control, simplifying hydraulic circuits for high-performance industrial and mobile systems.

Technical Specifications

• Model examples: EDFHG-04-140-3C40-XY-31T, EDFHG-04-140-3C40-XY-E-30T
• Valve type: Electro-hydraulic proportional directional and flow control valve (two-stage)
• Nominal size: 04 (CETOP 07 / NG16 class)
• Rated flow: 140 L/min (at 1.0 MPa valve pressure drop)
• Maximum operating pressure: 25 MPa (250 bar)
• Pilot pressure: 1.5–16 MPa
• Pilot flow: approx. 1 L/min (normal); approx. 4 L/min (transition)
• Spool type: 3C40
• Control: Proportional solenoids (XY = meter-in & meter-out)
• Rated current: approx. 980 mA
• Hysteresis: ≤5%
• Repeatability: ≤1%
• Maximum tank line back pressure: approx. 21 MPa
• Weight: approx. 12 kg
• Recommended amplifier: Yuken AMN series

Key Technical Advantages

1. Two-stage proportional design: Pilot proportional reducing valve drives the main stage for precise direction and flow control at high flow rates with fast response and high stability.
2. Multi-function integration in a single valve: Flow rate and direction are controlled by varying input current, simplifying circuits and reducing system cost and space.
3. Excellent drop-in interchangeability: Strict compliance with Yuken standard mounting dimensions and interfaces allows direct replacement of equivalent EDFHG proportional valves, minimizing modification costs and downtime.
4. Low hysteresis and high repeatability: ≤5% hysteresis and ≤1% repeatability deliver excellent control performance when paired with the dedicated amplifier.
5. Flexible pilot options: Internal/external pilot and internal/external drain configurations adapt to different system oil supply and return conditions.

Application Areas

Injection moulding machines, die-casting machines, metal-forming equipment, machine-tool hydraulics, metallurgical equipment, marine hydraulics, mobile machinery and other high-performance hydraulic circuits requiring precise proportional directional and flow control.

Expert Maintenance Tips

1. Ensure mounting surfaces are clean and flat before installation; use specified bolts and tighten to the recommended torque; fit seals correctly to prevent external leakage.
2. Maintain stable pilot pressure within 1.5–16 MPa and keep the differential to drain port back pressure greater than 1.5 MPa; ensure fluid cleanliness meets recommended standards.
3. Use shielded cables for electrical connections and ensure stable power and signal supply; thoroughly bleed air from the solenoids before first start-up.
4. Pair with Yuken dedicated power amplifiers for optimal performance; periodically check coil temperature and connection status.
5. Do not disassemble pilot or main stage internal components. Seal replacement or repairs should be performed only by technicians experienced with Yuken products; always perform functional and response tests before returning the valve to service.