4WE6D6X/OFEG24N9K4 Rexroth Solenoid Directional Valve 350bar

Product Overview

Models such as 4WE6D6X/OFEG24N9K4, 4WE6E1X/HG24N9K4, WE6J1X/24 and 4WE6D70/HG24N9K4 belong to the Bosch Rexroth 4WE6 / WE6 series of direct-operated solenoid directional spool valves. Featuring wet-pin high-power solenoids with detachable coils, they comply with ISO 4401-03-02-0-05 (NG6 / CETOP 03) mounting standards. Every unit undergoes rigorous 100% simulated operating-condition testing and offers excellent drop-in interchangeability with equivalent NG6 solenoid directional valves. Spring return or detent (OF) versions ensure reliable switching, making them ideal for industrial hydraulic systems requiring precise start-stop and directional control.

Technical Specifications 

• Model examples: 4WE6D6X/OFEG24N9K4, 4WE6E1X/HG24N9K4, WE6J1X/24, 4WE6D70/HG24N9K4
• Valve type: Direct-operated solenoid directional spool valve (4/3 or 4/2-way)
• Nominal size: NG6 (Size 6)
• Mounting interface: ISO 4401-03-02-0-05
• Spool symbols: D, E, J etc. (depending on specific model)
• Maximum operating pressure: 350 bar at ports P, A, B; 210 bar at port T (DC)
• Maximum flow: 80 l/min (DC)
• Actuation: Wet-pin high-power solenoids with detachable coil
• Supply voltage: 24 VDC (G24 / HG24)
• Electrical connection: N9K4 (3-pole device connector according to DIN EN 175301-803)
• Additional function: OF = without spring return with detent (selected models)
• Component series: 6X / 1X / 70 etc. (unchanged installation and connection dimensions within series)
• Weight: approx. 1.45 kg (single solenoid); approx. 1.95 kg (double solenoid)
• Protection class: IP65 (with correctly mounted mating connector)
• Hydraulic fluid compatibility: HL, HLP, HLPD, HVLP, HVLPD, HFC, etc.

Key Technical Advantages

1. Wet-pin high-power solenoids with detachable coils: Coils can be replaced and rotated 90° without opening the pressure-tight chamber, simplifying maintenance while delivering strong magnetic force for reliable switching under frequent operation.
2. Precision spool and spring/detent design: High-accuracy machined spool combined with spring return or OF detent ensures fast, accurate shifting and reliable holding or return on power loss, enhancing system safety.
3. Excellent drop-in interchangeability: Strict compliance with ISO 4401-03 mounting face and standardized electrical interfaces allows direct replacement of equivalent NG6 solenoid directional valves, minimizing modification costs and downtime.
4. High pressure and flow capability: Rated for up to 350 bar operating pressure and 80 l/min flow, with low internal leakage and high volumetric efficiency for medium-to-high-pressure systems.
5. Flexible configurations and manual override: Available in single/double solenoid versions with various spool functions and optional concealed manual override to suit diverse application needs.

Application Areas

Injection moulding machines, die-casting machines, metal-forming equipment, machine-tool hydraulics, packaging machinery, automated production lines, mobile equipment actuator control and other medium-to-high-pressure hydraulic circuits requiring precise start-stop and directional switching.

Expert Maintenance Tips

1. Verify mounting surface flatness and roughness before installation; use specified M5 bolts and tighten to the recommended torque; fit seals correctly to prevent external leakage.
2. Maintain recommended fluid cleanliness per ISO 4406; use hydraulic fluids compatible with the installed seal material. Thoroughly bleed the system before first start-up to avoid cavitation and noise.
3. Use standard-compliant shielded cables for electrical connections and keep supply voltage within 24 VDC ±10%. Periodically inspect connector sealing and coil temperature.
4. Manual override (if fitted) should only be operated within the allowable system pressure range to avoid damage to the override pin. Clean and protect the valve during long-term storage.
5. Do not disassemble internal components other than the solenoid coil. Seal replacement or repairs should be performed only by technicians experienced with Rexroth products; always perform functional and leakage tests before returning the valve to service.