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Pressure Reducing &amp; Relieving Valves (RBG)

更新时间：2026-05-09 10:19:20

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RBG series valves are composite pressure control components developed by Yuken specifically for hydraulic balancing circuits, integrating both pressure reducing and counterbalancing/relieving functions in a single unit. These valves serve as a compact alternative to conventional setups requiring separate pressure reducing, relief, and check valves, optimizing system design and performance.

Core Functions & Working Principle

Dual Operational Modes

Pressure Reducing Mode: Maintains a stable downstream pressure regardless of upstream fluctuations by throttling flow through an adjustable orifice
Pressure Relieving/Counterbalancing Mode: Prevents excessive pressure buildup in hydraulic circuits by opening to bypass fluid when pressure exceeds the set limit, protecting system components

Operating Mechanism

Utilizes a spring-loaded piston/diaphragm that senses downstream pressure
When downstream pressure drops below the setpoint, spring force opens the valve to increase flow
When pressure exceeds the setpoint, fluid pressure overcomes spring force to close the valve (reducing mode) or open the relief port (relieving mode)
Internal check valve allows free reverse flow when needed

Key Specifications (Yuken RBG Series)

Parameter	Value
Max. Operating Pressure	25 MPa (3,630 psi)
Max. Flow Rate	Up to 125 L/min (33 gpm)
Body Type	Threaded cartridge design for easy installation
Available Sizes	RBG-03 (small) and RBG-06 (large) series
Control Type	Manual adjustment (proportional EHRBG variant also available)
Mounting	In-line or sub-plate mounting options

Applications

RBG valves excel in hydraulic systems requiring precise pressure control and load balancing:

Hydraulic Balancing Circuits: Ideal for applications where multiple actuators operate at different pressure levels
Machine Tools: Controls pressure for clamping, feeding, and auxiliary functions
Material Handling Equipment: Balances loads in lifting mechanisms, preventing drift and ensuring safety
Mobile Hydraulics: Used in construction machinery for stable operation of boom, arm, and bucket functions
Industrial Automation: Maintains consistent pressure in production line actuators
Presses & Forming Equipment: Controls pressure during forming operations for quality consistency

Advantages Over Conventional Systems

Benefit	Description
Space Savings	Single valve replaces three separate components (reducer, relief, check valve)
Cost Efficiency	Lower purchase and installation costs compared to multi-valve setups
Improved Response	Integrated design provides faster pressure adjustment and more stable control
Simplified Maintenance	Fewer components mean reduced potential failure points and easier troubleshooting
Energy Savings	Optimized flow control minimizes pressure losses and improves system efficiency

Model Number Explanation (RBG-03-R-10)

Code	Meaning
RBG	Pressure Reducing & Relieving Valve Series
03	Nominal Size (03 = small, 06 = large)
R	Body Type (R = standard, other options may apply)
10	Setting Range Code (varies by model)

Installation & Maintenance Tips

Proper Orientation: Install with flow direction matching arrow on valve body
Filter Placement: Always install a 10 μm or finer filter upstream to protect valve internals
Pressure Setting: Adjust pressure gradually while monitoring system pressure with a gauge
Regular Inspection: Check for leaks, corrosion, and proper operation every 6 months
Fluid Compatibility: Use only hydraulic fluids recommended for the valve's seal materials
Temperature Range: Operate within specified temperature limits (-20°C to +80°C typical)

Conclusion

RBG pressure reducing & relieving valves represent a sophisticated solution for modern hydraulic systems, combining multiple functions into a single, compact package. By providing precise pressure control and reliable overpressure protection, these valves enhance system performance, safety, and efficiency across a wide range of industrial and mobile applications. For detailed application-specific guidance, consult the Yuken RBG series catalog or contact an authorized distributor.

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