Parameters of YUKEN Relief Valves Models RG-01-C-22, RG-03-C-22, RG-06-C-22

1. Model Interpretation

1.1 Model Coding Rules (Unified for All Three Models)

• RG: Series code, indicating YUKEN RG series direct-acting relief valve, featuring simple structure, quick response, and threaded connection for easy integration into small to medium hydraulic systems.
• 01/03/06: Nominal size code, representing the valve’s flow capacity and connection size, which directly determines the applicable system flow range:
  • RG-01-C-22: Nominal size 01, smallest flow capacity, suitable for small hydraulic systems with low flow requirements.
  • RG-03-C-22: Nominal size 03, medium flow capacity, suitable for small to medium-sized hydraulic systems with moderate flow demands.
  • RG-06-C-22: Nominal size 06, large flow capacity, suitable for medium-sized hydraulic systems requiring higher flow rates.
• C: Adjustment type code, indicating manual knob adjustment (rotary knob for precise pressure setting, easy operation and adjustment).
• 22: Structural design code, representing the standard structural configuration (single-stage direct-acting design, spring-loaded, with pressure relief function, consistent installation and connection dimensions for the same nominal size).

2. Technical Parameters

3. Product Features

3.1 Common Features (Applicable to All Three Models)

• Direct-Acting Design: Simple structure, few components, fast pressure response, and reliable pressure relief performance, suitable for small to medium hydraulic systems requiring quick pressure adjustment.
• Manual Knob Adjustment: Equipped with a precision rotary knob for easy and accurate pressure setting, with clear adjustment scales for convenient operation and maintenance.
• Threaded Connection: Standard BSPP threaded connection, easy to install and disassemble, suitable for compact hydraulic system layouts where space is limited.
• Stable Performance: Adopts high-quality spring and precision valve core, ensuring stable pressure control and low pressure fluctuation during operation.
• Wide Pressure Range: Multiple pressure adjustment ranges available (0.3-21MPa), adaptable to various pressure requirements of industrial hydraulic systems.
• Cost-Effective: Simple structure, low manufacturing and maintenance costs, high cost performance for general industrial applications.

3.2 Model-Specific Features

• RG-01-C-22:
  • Smallest nominal size and light weight (approx. 0.8kg), suitable for small hydraulic systems with low flow requirements (≤15 L/min), such as small machine tools and precision instruments.
  • 1/4″ BSPP threaded connection, compact size, ideal for installation in narrow spaces.
  • Suitable for low to medium pressure systems, pressure adjustment range up to 14MPa, meeting the needs of small equipment.
• RG-03-C-22:
  • Balanced size and performance, medium flow capacity (≤30 L/min), suitable for most general industrial hydraulic systems, such as small injection molding machines and woodworking machinery.
  • 3/8″ BSPP threaded connection, cost-effective, widely used in medium-sized hydraulic equipment requiring moderate flow and pressure.
  • Supports pressure adjustment up to 21MPa, adaptable to more complex working conditions compared to RG-01-C-22.
• RG-06-C-22:
  • Large flow capacity (≤80 L/min), suitable for medium-sized hydraulic systems requiring higher flow rates, such as medium hydraulic presses and plastic machinery.
  • 3/4″ BSPP threaded connection, larger flow channel, low pressure loss during full flow operation.
  • Heavy-duty structure, strong pressure-bearing capacity, stable operation under high flow and high pressure conditions.

4. Application Fields

• RG-01-C-22: Small machine tools (lathes, drilling machines), precision instruments, small packaging machinery, medical equipment, and other small hydraulic systems requiring low flow, compact installation, and precise pressure control.
• RG-03-C-22: General industrial machinery, small to medium-sized injection molding machines, woodworking machinery, printing machinery, textile machinery, and other medium-sized hydraulic systems with moderate flow demands.
• RG-06-C-22: Medium-sized hydraulic presses, plastic machinery, rubber processing equipment, small construction machinery auxiliary systems, and other medium-sized hydraulic systems requiring high flow and high pressure protection.

5. Typical Model Variations

6. Installation and Operation Notes

• Before installation, check the valve model, nominal size, pressure range, and thread specification to ensure they match the system requirements.
• Clean the threaded ports and hydraulic lines to remove debris and contaminants, preventing damage to the valve core and seal.
• Use a suitable wrench to tighten the threaded connection, ensuring proper sealing without over-tightening to avoid thread damage or valve body deformation.
• Install the valve in a dry, clean, and well-ventilated environment, avoiding direct sunlight and high-temperature radiation to prevent seal aging.
• Connect the hydraulic lines correctly: inlet port (P) to the system pressure line, outlet port (T) to the oil tank line; reverse connection will cause valve failure and system damage.
• Adjust the pressure setting gradually using the rotary knob, starting from the minimum pressure and increasing to the required working pressure, ensuring the system pressure does not exceed the maximum operating pressure of the valve.
• Maintain hydraulic oil cleanliness at NAS 8 level or higher, and install a filter (≥15 μm) in the system to prevent impurities from jamming the valve core and affecting performance.
• The operating temperature of the hydraulic oil should be controlled within -10°C to 80°C; excessive temperature will reduce the service life of the spring and seal.
• 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 adjusting the pressure, ensure the system is in a no-load or low-load state to avoid sudden pressure changes causing equipment damage.
• When replacing parts, use only genuine YUKEN replacement parts to ensure compatibility and maintain valve performance; non-genuine parts may cause pressure instability or valve failure.
• Do not disassemble the valve without authorization; if maintenance is required, refer to the YUKEN technical manual or contact professional maintenance personnel.