EHBG Proportional Relief Valves (
Yuken)
EHBG series are
electro-hydraulic proportional pilot-operated relief valves manufactured by
Yuken Kogyo, designed to regulate hydraulic system pressure proportionally to an input electrical signal . They combine a small high-performance EH series proportional pilot valve with a low-noise main relief valve for precise, responsive pressure control .
Core Construction & Operating Principle
-
Pilot stage: EH series 1/8" proportional electro-hydraulic pilot relief valve with proportional solenoid
-
Main stage: Specially developed low-noise main relief valve
-
Operation: Input current (via power amplifier) adjusts pilot pressure, which controls main valve opening to maintain system pressure proportionally
-
Key: Requires compatible power amplifier for operation
Key Specifications
|
Model
|
Size
|
Max Flow
|
Min Flow
|
Max Pressure
|
Pressure Ranges
|
|
EHBG-03
|
03 (NG06)
|
100 L/min
|
3 L/min
|
24.5 MPa (3,550 psi)
|
B: 0.2–7.0 MPa C: 1.5–21.0 MPa H: 1.5–24.5 MPa
|
|
EHBG-06
|
06 (NG10)
|
200 L/min
|
3 L/min
|
24.5 MPa (3,550 psi)
|
Same as above
|
|
EHBG-10
|
10 (NG16)
|
400 L/min
|
3 L/min
|
24.5 MPa (3,550 psi)
|
Same as above
|
-
Electrical: DIN 43650 (ISO 4400) connector
-
Mounting: Subplate (CETOP/DIN standard)
-
Response: Fast proportional response with low hysteresis
-
Noise: Low-noise main valve design
Model Number Designation (Example: EHBG-06-H-50)
|
Segment
|
Meaning
|
|
EHBG
|
Series: Electro-Hydraulic proportional relief valve with low-noise main valve
|
|
06
|
Size code (03, 06, 10)
|
|
H
|
Pressure range (B/C/H)
|
|
50
|
Design code
|
|
SU (optional)
|
With manual override
|
Distinctive Features
-
Proportional control: System pressure varies linearly with input current
-
Low noise: Specially designed main valve reduces hydraulic noise
-
High precision: Stable pressure control with minimal hysteresis
-
Dual functionality: Combines pilot proportional control with high-flow main relief
-
Versatile integration: Compatible with traditional controllers and microprocessors
-
Reliable performance: Yuken’s proven hydraulic technology
Applications
-
Industrial machinery: Plastic injection molding, die casting, metal forming presses (force profiling)
-
Test equipment: Hydraulic test rigs (precise pressure programming)
-
Mobile hydraulics: Construction machinery, agricultural equipment requiring smooth pressure modulation
-
Automation systems: Servo-hydraulic actuators in production lines
-
Any system needing: Remote pressure adjustment, multi-pressure setpoints, or smooth pressure transitions
Installation & Usage Notes
-
Power amplifier: Must be used with compatible Yuken power amplifier (e.g., HNC-1085)
-
Fluid compatibility: Use clean hydraulic oil (ISO 32–68) with recommended filtration (≥10 μm)
-
Wiring: Follow electrical connection guidelines for DIN 43650 connector
-
Mounting: Subplate mounting per CETOP/DIN standards; ensure proper sealing
-
Adjustment: Calibrate input current vs. pressure relationship for application requirements
-
Maintenance: Regularly check for leaks, contamination, and electrical connector integrity
Related Yuken Valve Series
-
EBG: Basic proportional electro-hydraulic relief valve (without low-noise main valve)
-
EHRBG: Proportional relieving and reducing valve (combines relief and reducing functions)
-
EHFBG: Proportional flow control and relief valve (adds flow control capability)
EHBG series balances precision, noise reduction, and flow capacity, making it suitable for applications requiring both accurate pressure control and quiet operation in medium-to-high flow hydraulic systems.
