4WEH25-5X/6X/7X hydraulic valve

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Product details

4WEH25-5X/6X/7X Hydraulic Valve Technical Overview

I. Product Overview

The4WEH25-5X/6X/7Xseries hydraulic valve is aelectro-hydrauli c directional control valveproduced byRexroth (Bosch Rexroth). It belongs to the WEH series and is designed for precise control of hydraulic fluid direction in industrial applications. The valve is available in three variants:5X,6X, and7X, which differ in terms of connection type, electrical interface, and additional features.

II. Key Technical Specifications

【表格】

Parameter Specification

Nominal Size 25 mm

Maximum Operating Pressure 350 bar

Maximum Flow Rate 1100 L/min

Control Type Electro-hydrauli c (solenoid-operated pilot control)

Connection Standard DIN 24340 A (plate-mounted)

Available Variants 5X, 6X, 7X (differences in connection type, electrical interface, and features)

Optional Features Manual override, switching time adjustment, main valve stroke adjustment

Solenoid Type Wet-type DC solenoid (optional AC versions available)

Electrical Connection Individual or centralized (with or without manual button)

Main Valve Centering Spring-centered or hydraulic pressure-centered

Seal Material NBR (Nitrile Butadiene Rubber)

Media Compatibility Hydraulic oil (HLP, HVLP, etc.)

III. Structural Features

1. Design Components:

• Main Valve Body: Houses the main valve spool and internal passages.

• Main Valve Spool: Controls the fluid direction under the action of pilot pressure or spring force.

• Reset Springs: Ensure the main valve spool returns to the neutral position when pilot pressure is released.

• Pilot Solenoid Valve: A wet-type solenoid valve that controls the pilot pressure to actuate the main valve spool.

2. Operational Principles:

• Spring-Centered: The main valve spool is held in the neutral position by two reset springs.

• Pilot-Operated: The solenoid valve controls the pilot pressure to shift the main valve spool, enabling directional control of the hydraulic fluid.

• Hydraulic Reset: In some configurations, hydraulic pressure is used to reset the main valve spool, enhancing reliability in high-pressure systems.

3. Optional Enhancements:

• Pre-Pressure Valve: Can be installed in the main valve to regulate pilot pressure.

• Insertion Dampers: Limit the flow rate to the pilot valve, improving control stability.

• Pressure Relief Valve: Required for working pressures exceeding 25 MPa to protect the system.

IV. Application Areas

• Construction Machinery: Hydraulic systems in excavators, cranes, and loaders.

• Metallurgical Equipment: Rolling mills, presses, and hydraulic power units.

• Marine Systems: Steering gear, winches, and thruster control systems.

• Industrial Automation: Hydraulic actuators, cylinders, and rotary tables.

V. Installation and Maintenance

1. Installation Guidelines:

• Mounting: Plate-mounted design for easy integration into hydraulic manifolds (ISO 4401 compliant).

• Electrical Connections: Follow the manufacturer's guidelines for proper wiring and grounding.

• Hydraulic Connections: Ensure cleanliness of hydraulic lines to prevent contamination.

2. Maintenance Recommendations:

• Regular Inspections: Check for leaks, solenoid function, and valve response.

• Filter Replacement: Maintain hydraulic oil cleanliness to extend valve lifespan.

• Seal Replacement: Replace worn seals to prevent internal and external leakage.

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