Parameters of YUKEN Relief Valves Models BG-02, BG-03, BG-06, BG-10

1. Model Interpretation

1.1 Model Coding Rules (Unified for All Four Models)

• BG: Series code, indicating YUKEN BG series sub-plate mounted pilot operated relief valve, widely used in general industrial hydraulic systems requiring pressure protection and regulation.
• 02/03/06/10: Nominal size code, representing the valve’s flow capacity and connection size:
  • BG-02: Nominal size 02, smallest flow capacity, suitable for small hydraulic systems with low flow requirements.
  • BG-03: Nominal size 03, small to medium flow capacity, suitable for small to medium-sized hydraulic systems.
  • BG-06: Nominal size 06, medium to large flow capacity, suitable for medium to large-sized hydraulic systems.
  • BG-10: Nominal size 10, largest flow capacity, suitable for large hydraulic systems requiring high flow rates.
• Additional Code Explanation: Complete model typically includes design code (32/40), pressure adjustment range code, and other options:
  • 32: Conventional design, standard performance.
  • 40: Low noise design (S-BG series), reduced operating noise by up to 10dB compared to conventional models.
  • Pressure adjustment range codes: 1 (0.6-7MPa), 2 (3.5-21MPa), 3 (7-31.5MPa), etc. (specific ranges may vary by model).

2. Technical Parameters

3. Product Features

3.1 Common Features (Applicable to All Four Models)

• Pilot Operated Design: High pressure control accuracy, stable performance, and low pressure drop at full flow compared to direct acting relief valves.
• Sub-plate Mounted: Easy integration into hydraulic manifolds, space-saving, and convenient for system layout optimization.
• Remote Control Capability: Equipped with remote control port (X), allowing remote pressure adjustment and system unloading through external control valves.
• Wide Pressure Range: Multiple pressure adjustment ranges available (0.6-31.5MPa), suitable for various pressure requirements in industrial applications.
• High Reliability: Adopts high-quality materials and precision manufacturing processes, ensuring long service life (≥50,000 cycles) and stable operation under harsh conditions.
• Low Noise Option: Low noise design (S-BG series, design code 40) available for applications requiring reduced noise levels.

3.2 Model-Specific Features

• BG-02:
  • Smallest nominal size and light weight, suitable for small hydraulic systems (e.g., small machine tools, precision instruments) requiring low flow and low to medium pressure protection.
  • Lower maximum flow (up to 30 L/min), ideal for systems with limited flow requirements.
• BG-03:
  • Balanced size and performance, suitable for most general industrial hydraulic systems (e.g., small injection molding machines, woodworking machinery).
  • Medium flow capacity (up to 80 L/min), cost-effective, and widely used in medium-sized hydraulic equipment.
• BG-06:
  • Large flow capacity (up to 200 L/min), suitable for medium to large hydraulic systems (e.g., medium-sized hydraulic presses, plastic machinery).
  • Higher maximum operating pressure (31.5 MPa), suitable for high-pressure applications requiring large flow rates.
• BG-10:
  • Largest flow capacity (up to 400 L/min), suitable for large hydraulic systems (e.g., large hydraulic presses, die-casting machines, metallurgical equipment).
  • Heavy-duty construction, designed to withstand high flow and high pressure conditions, ensuring reliable operation in demanding industrial environments.

4. Application Fields

• BG-02: Small machine tools, precision instruments, medical equipment, small packaging machinery, and other small hydraulic systems requiring low flow and precise pressure control.
• BG-03: General industrial machinery, small to medium-sized injection molding machines, woodworking machinery, printing machinery, and textile machinery.
• BG-06: Medium-sized hydraulic presses, plastic machinery, rubber processing equipment, and other medium to large hydraulic systems requiring high flow and high pressure protection.
• BG-10: Large hydraulic presses, die-casting machines, metallurgical equipment, construction machinery (e.g., small excavators), and other large hydraulic systems requiring very high flow rates.

5. Typical Model Variations

6. Installation and Operation Notes

• Before installation, check the valve model, nominal size, pressure range, and design code to ensure they match the system requirements.
• Clean the mounting surface and ensure no debris or contaminants are present to prevent leakage and valve damage.
• Use the correct mounting bolts and torque specifications (refer to YUKEN technical documentation) to ensure proper sealing and prevent valve body deformation.
• Connect the hydraulic lines correctly: P (pressure port), T (tank port), X (remote control port – plug if not used).
• Ensure the remote control port (X) is properly sealed if not in use to prevent oil leakage and pressure loss.
• Adjust the pressure setting gradually using the adjustment handle, ensuring the system pressure does not exceed the maximum operating pressure of the valve.
• 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 pilot valve and main 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 valve performance.
• Regularly inspect the valve for oil leakage, abnormal noise, and pressure fluctuations; if any abnormality is found, stop the system immediately for inspection and maintenance.
• When replacing parts, use only genuine YUKEN replacement parts to ensure compatibility and maintain valve performance.
• Do not exceed the maximum allowable pressure and flow specified in the technical parameters to prevent valve damage and system failure.