EDFG-01 Shockless Type Directional and Flow Control Valves

🌟 Core Features

1. Shockless Design
   1. Inherits the basic concept of YUKEN “G series solenoid operated directional valves”
   2. Adjustable shifting time eliminates hydraulic shock during direction changes
   3. Significantly improves system stability and extends component lifespan
2. Integrated Control
   1. Combines directional control and flow regulation in a single valve
   2. Flow rate changes proportionally with input current to the proportional coils
   3. Direction is controlled by energizing one of the two proportional coils
3. Precision Performance
   1. Maximum flow adjustment capability (not available in standard G series valves)
   2. Enables precise setting of actuator maximum speed
   3. Works with YUKEN’s dedicated digital amplifiers for enhanced maneuverability and repeatability
   4. Provides accurate control of displacement, speed, and force through electrical signal input
4. Operational Advantages
   1. Simplifies hydraulic circuits by replacing multiple valves
   2. Reduces system cost and complexity
   3. Allows independent control of speed, acceleration, and direction in one valve

📊 Technical Specifications (EDFG-G01 Model)

⚙️ Working Principle

1. Direction Control: Energizing one proportional coil shifts the spool to direct flow to the actuator (extend or retract)
2. Flow Control: The magnitude of the input current to the energized coil determines the spool position, which in turn controls the flow rate proportional to the current
3. Shockless Operation: Adjustable shifting time feature controls the spool movement speed, eliminating pressure spikes and mechanical shock during direction changes
4. Maximum Flow Limiting: A dedicated adjustment screw allows setting the maximum flow rate, preventing over-speed of the actuator
5. Amplifier Interface: Works with YUKEN’s digital amplifiers to provide closed-loop control, improving response time and repeatability

🛠️ Applications

• Injection Molding Machines: For mold opening/closing, ejector movement, and plasticizing screw control
• Press Machines: Controlling slide movement and pressure application with minimal shock
• CNC Machine Tools: Axis movement control for precise positioning
• Material Handling Equipment: Crane and lift controls requiring smooth acceleration/deceleration
• Packaging Machinery: Precise control of packaging processes with reduced product damage
• Textile Machinery: Smooth operation of weaving and knitting machines

🧩 Model Nomenclature (Example: F-EDFG-01-30-3C2)

📌 Installation & Operation Notes

1. Amplifier Requirement: Must be used with YUKEN’s dedicated digital amplifier for optimal performance
2. Hydraulic Fluid: Use clean hydraulic oil (ISO VG 32-68) with maximum contamination level of NAS 1638 Class 7
3. Filter Recommendation: Install a 10 μm filter in the supply line to protect the valve from contamination
4. Mounting: Can be mounted in any orientation, but keep the coil vertical for best heat dissipation
5. Adjustment: Set maximum flow rate before adjusting shifting time for shockless operation
6. Wiring: Follow the amplifier and valve wiring diagrams to ensure proper electrical connections