EBG Proportional Relief Valves
EBG Proportional Relief Valves (EBG Series Electro-Hydraulic Proportional Relief Valves)
The EBG series is a core product line of pilot-operated electro-hydraulic proportional relief valves produced by manufacturers such as YUKEN. Through proportional electromagnet + electro-hydraulic feedback control, it achieves precise linear correspondence between system pressure and input current signal, adapting to the closed-loop pressure control and remote stepless pressure regulation needs of medium and high-pressure hydraulic systems.
I. Core Structure and Working Principle
The EBG valve consists of two parts that work together to achieve precise pressure control:
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Proportional Pilot Valve: A small high-performance 1/8 electro-hydraulic proportional relief valve with a manual pressure adjustment device (to limit the maximum pressure).
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Low-Noise Main Relief Valve: A specially developed large-flow main valve that provides low-noise and high-response pressure control.
Working Process:
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The electronic amplifier receives the control signal (0-10V/4-20mA) and outputs an adjustable current of 0~800mA to the proportional electromagnet.
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The proportional electromagnet generates an electromagnetic force proportional to the current to control the pilot pressure.
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The pilot pressure acts on the main valve core, proportionally adjusting the main valve opening to realize continuous stepless control of the system pressure.
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The main valve integrates a pressure feedback mechanism to ensure pressure control accuracy and stability.
II. Main Models and Technical Parameters
1. Common Model Specifications (YUKEN Standard)
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Model
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Maximum Flow Rate
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Rated Pressure
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Interface Size
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Coil Specification
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Application Scenario
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EBG-01-C-60T
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25 L/min
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0.2~14 MPa
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G1/4
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DC24V, 700mA
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Small and Medium Flow Circuits
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EBG-03-C-60T
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80 L/min
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0.2~14 MPa
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G3/8
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DC24V, 750mA
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Medium Flow Main Circuits
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EBG-06-C-60T
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25~160 L/min
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0.2~14 MPa
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G3/4
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DC24V
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Large Flow Main Circuits
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EBG-10
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250 L/min
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0.2~14 MPa
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CETOP-8
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DC24V
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Ultra-Large Flow Systems
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Data Source: YUKEN Official Product Manual
2. Key Performance Features
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Control Accuracy: Low hysteresis (≤3%), high linearity, and pressure repeatability of ±1%.
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Response Characteristics: Step response time ≤200ms, adapting to dynamic pressure regulation needs.
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Noise Level: Optimized design of the main valve, reducing noise by 10-15dB compared with traditional relief valves.
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Electromagnet: Wet structure, low electromagnetic interference, and long service life (≥10 million cycles).
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Safety Protection: Built-in manual adjustment device to preset the maximum system pressure and prevent overload.
III. Application Fields
EBG proportional relief valves are widely used in hydraulic systems that require multi-stage pressure control, remote pressure regulation or closed-loop pressure control:
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Industry
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Typical Application Equipment
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Control Requirements
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Plastic Machinery
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Injection Molding Machines, Extruders
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Clamping Force Control, Multi-Stage Injection Pressure Regulation
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Machine Tool Equipment
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CNC Machining Centers, Grinding Machines
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Spindle Pressure Control, Tool Feeding Pressure Regulation
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Forming Equipment
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Hydraulic Presses, Die Casting Machines
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Precise Pressing Force Control, Multi-Stage Pressure Forming
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Construction Machinery
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Excavators, Cranes
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Working Device Pressure Matching, Energy-Saving Control
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Automated Production Lines
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Robots, Automated Assembly Lines
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End Effector Pressure Control, Force Feedback Regulation
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IV. Usage Points
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Matching Requirements: Must be used with a dedicated power amplifier (such as YUKEN EPC series), which can be panel-mounted or rail-mounted.
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Control Signal: Supports potentiometer manual adjustment and PLC analog control (0-10V/4-20mA), enabling open-loop or closed-loop control.
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Installation Method: Standard plate mounting (CETOP-3/5/8), easy to integrate into hydraulic systems.
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Maintenance Notes:
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Oil Cleanliness Requirement: NAS Class 9 or above; it is recommended to install a 10μm precision filter.
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Operating Oil Temperature: -10°C ~ +60°C, optimal operating temperature 30-50°C.
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Regularly check the insulation performance of the proportional electromagnet to prevent short-circuit faults.
V. Selection Guide
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Selection by Flow Rate: Select the corresponding model (EBG-01/03/06/10) according to the maximum system flow rate. It is recommended that the flow rate does not exceed 80% of the rated value to ensure response performance.
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Selection by Pressure: Confirm that the maximum system pressure does not exceed the rated valve pressure (14MPa); the manual adjustment device can limit the maximum pressure.
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Control Method: Select a suitable amplifier according to the control system, which needs to support the required control signal type (voltage/current).
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Special Requirements:
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High-Frequency Response Requirement: Select a model with faster response time (such as EBG-03).
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Low-Noise Environment: Prioritize the EBG series (lower noise than traditional relief valves).
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Explosion-Proof Requirement: Explosion-proof proportional electromagnets can be selected (special customization required).
Summary
EBG Proportional Relief Valves are key components for achieving precise pressure control in hydraulic systems. Their electro-hydraulic proportional control technology allows the system pressure to be continuously adjusted according to the input signal, significantly improving the automation level and control accuracy of the equipment. Compared with traditional manual relief valves, the EBG series has the advantages of remote control, multi-stage pressure setting, and fast dynamic response, and is widely used in modern industrial automation equipment.
