Parameters of YUKEN Hydraulic Valves Models BG-02-3231Y, BG-03-3231Y, BG-06-3231Y

1. Model Interpretation

1.1 Model Coding Rules (Unified for All Three Models)

• BG: Series code, indicating YUKEN BG series electromagnetic directional control valve, a 3-position 4-way valve with spring-centered or detent positioning, widely used in general industrial hydraulic systems.
• 02/03/06: Nominal size code, representing the valve’s flow capacity and connection size:
  • BG-02: Nominal size 02, small flow capacity, suitable for small hydraulic systems.
  • BG-03: Nominal size 03, medium flow capacity, suitable for medium-sized hydraulic systems.
  • BG-06: Nominal size 06, large flow capacity, suitable for large hydraulic systems requiring high flow.
• 3231: Functional configuration code:
  • First “3”: 3-position valve core.
  • “2”: 4-way flow path design (P, T, A, B ports).
  • Second “3”: Spring-centered positioning (valve core returns to neutral position when power is cut off).
  • “1”: Single solenoid control (one side electromagnetic coil, the other side spring return).
• Y: Solenoid voltage code, indicating AC220V (standard voltage; other voltages such as DC24V are available on request, denoted by “D”).

2. Technical Parameters

3. Product Features

3.1 Common Features (Applicable to All Three Models)

• Reliable Operation: Adopts high-quality solenoid coil and precision valve core, ensuring stable switching performance and long service life (≥100,000 cycles).
• Spring-Centered Positioning: The valve core automatically returns to the neutral position when the solenoid is de-energized, preventing system misoperation and ensuring safe operation.
• Compact Structure: Optimized design, small overall size, easy to install in hydraulic systems with limited space.
• High Pressure Resistance: Rated pressure up to 21 MPa, suitable for medium and high-pressure hydraulic systems.
• Wide Compatibility: Compatible with petroleum-based hydraulic oils and anti-wear hydraulic oils, adapting to various industrial working conditions.
• Easy Maintenance: Modular design, easy to disassemble and replace the solenoid coil and valve core, reducing maintenance time and costs.

3.2 Model-Specific Features

• BG-02-3231Y:
  • Small nominal size and light weight, suitable for small hydraulic systems with low flow requirements (e.g., small machine tools, precision instruments).
  • Threaded connection, easy to install and disassemble, suitable for compact installation spaces.
• BG-03-3231Y:
  • Medium flow capacity, balancing size and performance, suitable for most general industrial hydraulic systems (e.g., injection molding machines, woodworking machinery).
  • Threaded connection, cost-effective, widely used in medium-sized hydraulic equipment.
• BG-06-3231Y:
  • Large flow capacity, suitable for large hydraulic systems requiring high flow (e.g., hydraulic presses, die-casting machines).
  • Flange connection, strong bearing capacity, stable operation under high flow and high pressure conditions.

4. Application Fields

• BG-02-3231Y: Small machine tools (lathes, drilling machines), precision instruments, small packaging machinery, medical equipment, and other small hydraulic systems requiring low flow and precise direction control.
• BG-03-3231Y: General industrial machinery, small to medium-sized injection molding machines, woodworking machinery, printing machinery, and textile machinery, suitable for medium flow hydraulic systems.
• BG-06-3231Y: Large hydraulic presses, die-casting machines, metallurgical equipment, construction machinery (small excavators, loaders), and other large hydraulic systems requiring high flow and high pressure.

5. Typical Model Variations

6. Installation and Operation Notes

• Before installation, check the valve model, nominal size, and solenoid voltage to ensure they match the system requirements.
• Install the valve in a dry, clean, and well-ventilated environment, avoiding direct sunlight and high-temperature radiation.
• Ensure the direction of the fluid flow (P, T, A, B ports) is consistent with the valve’s marking; reverse flow will cause valve failure.
• Tighten the connection bolts (threaded or flange) according to the specified torque to prevent oil leakage; over-tightening may damage the valve body.
• The solenoid coil should be installed correctly, ensuring good contact and avoiding loose connections that may cause coil burnout.
• Maintain hydraulic oil cleanliness at NAS 7 level or higher, and install a high-precision filter (≥10 μm) in the system to prevent impurities from damaging the valve core.
• The operating temperature of the hydraulic oil should be controlled within -10°C to 80°C; excessive temperature will affect the service life of the seal and solenoid coil.
• Regularly inspect the valve for oil leakage, abnormal noise, and slow switching; if any abnormality is found, stop the system immediately for inspection and maintenance.
• When replacing the solenoid coil, cut off the power supply first to avoid electric shock; use only genuine YUKEN replacement parts.
• Do not exceed the maximum allowable pressure and flow specified in the technical parameters to prevent valve damage.