I. Product Overview
The 4WRKE25-3X is an electro-hydraulic proportional directional control valve manufactured by Bosch Rexroth, belonging to the 4WRKE series. This valve adopts a pilot-operated design and features two-stage proportional control, enabling precise control over the flow direction and rate of hydraulic oil in hydraulic systems.
II. Technical Features
1. Proportional Control: It achieves continuous and proportional control over the flow direction and rate of hydraulic oil through proportional solenoid operation.
2. Pilot-Operated Design: Utilizing a pilot-operated two-stage proportional control mechanism, the main control spool incorporates electrical position feedback and integrated electronic components (OBE), enhancing control accuracy and stability.
3. High Pressure and Large Flow Rate: It can withstand a maximum operating pressure of up to 350 bar and deliver a maximum flow rate of up to 870 L/min (specific values may vary depending on the model and configuration), making it suitable for high-pressure and large-flow hydraulic systems.
4. Integrated Electronic Components: The built-in electronic amplifier board (OBE) processes input signals (filtering, amplification, linearization) and converts them into current signals to drive the proportional solenoids of the pilot stage, simplifying system wiring and improving control accuracy.
5. Multiple Installation Options: It is suitable for subplate mounting, with port connection patterns conforming to ISO 4401 standards, facilitating easy integration with hydraulic systems.
6. Spring-Centered Design: The main control spool is spring-centered, ensuring that the valve spool returns to the neutral position when no signal is input, enhancing system safety and reliability.
III. Application Scenarios
The 4WRKE25-3X electro-hydraulic proportional directional control valve is widely used in scenarios requiring precise control over the flow direction and rate of hydraulic oil, such as:
1. Industrial Automation Equipment: For precise positioning and speed regulation in injection molding machines, machine tools, and other equipment.
2. Construction Machinery: For controlling the force and sequence of movements of components such as booms and buckets in excavators, cranes, and other equipment.
3. Metallurgical Equipment: For hydraulic system control in rolling mills, continuous casting machines, and other equipment.
4. Marine Machinery: For hydraulic system control in steering gears, deck machinery, and other equipment.
IV. Model Interpretation
Take the model 4WRKE25E350L-3X/6EG24EK31/A1D3M as an example to interpret each part of the model:
• 4WRKE: Indicates an electro-hydraulically operated proportional directional control valve.
• 25: Represents a size of 25 (usually referring to a bore diameter of 25 mm).
• E350L: Indicates the rated flow rate and pressure rating (specific values may vary depending on the model).
• 3X: Indicates a component series ranging from 30-39, where X represents any digit from 0-9.
• 6EG24: Represents a pilot control valve size of 6, equipped with detachable coil proportional solenoids, and a power supply voltage of DC 24V.
• EK31: Indicates the type and interface form of the integrated electronic components (OBE).
• A1D3M: Indicates that the electronic component interface control value is ±10V, as well as other specific functions or configurations (which may vary depending on the model).
V. Usage Precautions
1. Installation and Commissioning: Install and commission the valve correctly according to the product manual, ensuring that all components are securely connected and free from leaks.
2. Electrical Connection: Pay attention to the polarity and voltage rating of electrical connections to avoid damage caused by incorrect or reversed connections.
3. Maintenance and Upkeep: Regularly maintain and upkeep the valve, inspecting and replacing worn components and seals to ensure normal operation.
4. Safe Operation: Exercise caution during operation to prevent high-pressure oil injection injuries or equipment damage.
