Flow Control and Relief Valves (FBG-03/06/10)
FBG-03/06/10 series are Yuken integrated flow control and relief valves designed for meter-in type flow control and pressure control in hydraulic systems. These power-saving valves maintain a minimal differential pressure of 0.6 MPa (87 PSI) between inlet and load pressure, significantly reducing energy consumption compared to conventional systems.
Core Functions & Working Principle
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Dual Control Capability
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Flow Control: Precise meter-in flow regulation with temperature compensation for consistent performance regardless of fluid temperature
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Pressure Control: Maintains inlet pressure 0.6 MPa above load pressure at all times
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Overpressure Protection: Functions as a relief valve to protect the system from excessive pressure
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Energy-Saving Operation
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Unlike conventional systems where pump pressure reaches preset maximum regardless of load, FBG valves follow load pressure while keeping minimal differential pressure
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Reduces power consumption, heat generation, and extends component life
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Working Principle
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The valve combines a flow control section with a pressure relief section
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The relief section maintains the constant 0.6 MPa differential pressure across the flow control orifice
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Flow rate is determined by the orifice size and the fixed differential pressure, ensuring stable flow regardless of load variations
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Technical Specifications
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Parameter
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FBG-03
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FBG-06
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FBG-10
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Unit
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Nominal Size
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03 (10mm)
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06 (20mm)
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10 (30mm)
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–
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Connection Size
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3/8″
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3/4″
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1-1/4″
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–
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Max Pressure Rating
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25
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25
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25
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MPa (3630 PSI)
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Max Flow Capacity
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125
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250
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500
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L/min (33/66/132 USGPM)
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Flow Adjustment Range
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1-125
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2-250
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5-500
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L/min
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Pressure Adjustment Range
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C: 0.8-14 MPa (116-2030 PSI) H: 1.0-21 MPa (145-3045 PSI)
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Same as 03
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Same as 03
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–
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Differential Pressure Setting
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0.6 MPa (87 PSI)
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Same as 03
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Same as 03
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–
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Mounting Type
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Sub-plate (CETOP standard)
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Same as 03
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Same as 03
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–
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Fluid Type
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Mineral oil (ISO VG 32-68)
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Same as 03
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Same as 03
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–
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Fluid Temperature Range
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-10°C to +60°C
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Same as 03
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Same as 03
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–
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Source: Yuken Europe Ltd. Specifications
Model Number Designation
FBG – XX – XXX – X | | | | | | | └─ Pressure Range: C (0.8-14 MPa) or H (1.0-21 MPa) | | └────── Flow Capacity (L/min): 125, 250, 500 | └─────────── Valve Size: 03, 06, 10 └─────────────── Series: Flow Control and Relief Valve
Example: FBG-06-250-C = Size 06, 250 L/min, C pressure range
Key Features
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Integrated Design: Combines flow control and pressure relief functions in one compact unit
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Temperature Compensation: Maintains consistent flow control despite fluid temperature changes
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Minimal Differential Pressure: 0.6 MPa setting for optimal energy efficiency
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Easy Installation: Sub-plate mounting conforms to international standards
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Reliable Performance: Robust construction for industrial applications
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Low Noise Operation: Advanced design minimizes hydraulic noise
Application Areas
FBG series valves are ideal for:
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Industrial Machinery: Injection molding machines, hydraulic presses, machine tools
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Mobile Equipment: Construction machinery, agricultural equipment, material handling systems
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Automation Systems: Production lines requiring precise speed control
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Energy-Saving Projects: Retrofits to reduce power consumption in existing hydraulic systems
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Systems with Variable Loads: Applications where load pressure changes frequently but flow needs to remain constant
Installation & Maintenance Tips
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Mounting
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Use specified sub-plates for correct alignment and leak-free operation
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Ensure proper orientation as indicated by the arrow on the valve body
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Tighten mounting bolts to recommended torque values
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Fluid Requirements
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Maintain clean hydraulic fluid (ISO 4406 Class 18/15 or better)
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Use recommended oil viscosity (ISO VG 32-68)
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Install a high-quality filter upstream of the valve
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Adjustment
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Flow adjustment: Turn the flow control knob clockwise to decrease flow, counterclockwise to increase
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Pressure adjustment: Turn the relief valve knob clockwise to increase pressure setting, counterclockwise to decrease
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Always adjust pressure with the system under load for accurate setting
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Maintenance
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Regularly check for leaks and abnormal noise
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Clean or replace the filter element as per maintenance schedule
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Periodically verify pressure and flow settings to ensure optimal performance
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Comparison with Conventional Systems
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Aspect
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FBG Series Valves
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Conventional Flow Control + Relief Valve Systems
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Energy Consumption
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Low (follows load pressure)
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High (pump runs at maximum pressure)
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Heat Generation
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Minimal
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Significant
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Component Life
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Extended
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Reduced due to higher stress
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System Complexity
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Low (integrated design)
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High (two separate valves)
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Installation Space
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Compact
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Larger
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Flow Stability
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Excellent (temperature compensated)
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Good (may vary with temperature)
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Conclusion
FBG-03/06/10 flow control and relief valves offer a superior solution for hydraulic systems requiring precise flow control with energy efficiency. Their integrated design, minimal differential pressure operation, and temperature compensation make them ideal for a wide range of industrial and mobile applications. By reducing energy consumption and heat generation, these valves contribute to lower operating costs and longer system life.
For detailed technical specifications, installation instructions, and maintenance guidelines, refer to the official Yuken FBG series catalog or contact your local Yuken distributor.
