4WE6D6X/EG24N9Z5L Rexroth Solenoid Valve 80 L/min 350 Bar

Product Overview

The 4WE6 series solenoid directional valve (including models 4WE6D6X/EG24N9Z5L, 4WE6E61B/CG24N9Z5L, and 4WE6D6X/EG24K4OMBG24) is manufactured to original Bosch Rexroth technical standards. Belonging to the 4WE6 series with size 6 (NG6 / CETOP 3 / ISO 4401-03), this valve is a direct-operated solenoid directional spool valve. The valve uses solenoids to directly move the spool, with connection dimensions conforming to DIN 24340. It employs wet armature AC or DC solenoids, with optional manual override, and is available with individual or central electrical connections and 53 standard spool types.

The valve body is made of high-strength spheroidal cast iron with steel internal parts and NBR (nitrile rubber) seals, offering excellent pressure resistance and durability. The three models feature D-type (P/A/B/T blocked in center) and E-type (all ports closed in center) spool configurations, equipped with 24 VDC wet armature solenoids. Maximum operating pressure is 350 bar (ports P/A/B), with maximum flow of 80 L/min (DC solenoid) or 60 L/min (AC solenoid).

This product is dimensionally and functionally identical to the original Rexroth 4WE6 series valve, with a mounting surface conforming to ISO 4401-03-02-0-05 (with or without locating hole), offering true drop-in interchangeability for direct replacement of same-specification OEM valves. Every unit undergoes 100% bench testing under simulated working conditions, including rated pressure holding, directional response verification, internal leakage measurement, and solenoid response characterization.

Technical Specifications 

General Specifications

• Model: 4WE6D6X/EG24N9Z5L / 4WE6E61B/CG24N9Z5L / 4WE6D6X/EG24K4OMBG24

• Product Series: 4WE6 (Size 6 / NG6 / CETOP 3 / ISO 4401-03)

• Design Series: 60 series / 61 series

• Spool Type: D type (P/A/B/T blocked in center) / E type (All ports closed in center)

• Design: Direct-operated, subplate mounting solenoid directional valve with wet armature solenoids

• Ways/Positions: 2-position 4-way / 3-position 4-way

• Mounting Pattern: DIN 24340-A6 / ISO 4401-03-02-0-05 / CETOP R 35 H-03 / NFPA-D03

• Installation Position: Any

Hydraulic Parameters

• Maximum Operating Pressure (Ports P/A/B): 350 bar (5075 psi)

• Maximum Flow Rate: 80 L/min (21 USgpm) DC / 60 L/min (15.8 USgpm) AC

• Maximum Tank Port Pressure (Port T): Refer to catalog curves

• Hydraulic Fluid: Mineral-based hydraulic oil (HL, HLP, HLPD, HVLP, HVLPD, HFC)

• Viscosity Range: 2.8 – 500 mm²/s (cSt)

• Fluid Temperature Range: -30°C to +80°C

• Filtration: ISO 4406 20/18/15 or better

• Internal Leakage: ≤ 0.1 L/min at rated pressure

Electrical Parameters

• Supply Voltage: 24 VDC (G24/CG24)

• Voltage Tolerance: ± 10%

• Solenoid Type: Wet armature (wet-pin) solenoid, high-power, optionally rotatable by 90°

• Coil Winding Insulation: Class H

• Coil Encapsulation: Class F

• Electrical Connector: K4 (DIN EN 175301-803, 3-pole 2+PE) / Z5L (large plug-in connector with indicator light)

• Protection Class: IP65 (with standard connector)

• Power Consumption: approx. 30 W (DC)

• Response Time: Energizing 25-45 ms / De-energizing 10-20 ms

• Duty Cycle: Continuous (ED = 100%)

Materials & Construction

• Valve Body: High-strength spheroidal cast iron

• Internal Parts: Steel

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard) / FKM (optional)

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• Single solenoid models: approx. 1.45 kg

• Double solenoid models: approx. 2.0 kg

Key Technical Advantages

1. Wet Armature Solenoid Design for High Reliability
The 4WE6 series employs a wet armature solenoid design where the armature operates in hydraulic fluid, effectively reducing shifting impact noise and wear while improving heat dissipation. Wet armature solenoids have a longer service life because the armature moves in oil, reducing impact and wear. DC solenoids feature soft switching characteristics, high operating frequency, no danger to the coil when the armature is held in a certain position, and insensitivity to low voltage, short-term overvoltage, overload, or mechanical binding.

2. High-Power Solenoid with Flexible Installation
The valve features high-power solenoids that are optionally rotatable by 90° to accommodate different electrical wiring layouts. Solenoid coils can be changed quickly without leakage from the hydraulic system, significantly reducing downtime and maintenance costs. Optional concealed manual override is available for commissioning and maintenance.

3. Precision Spool Machining with 53 Spool Options
The control spool is precision-ground from carburized steel with micron-level clearance control. The 4WE6 series offers 53 standard spool types including D type (P/A/B/T blocked in center) and E type (all ports closed in center), meeting diverse hydraulic circuit design requirements. The precision spool clearance ensures internal leakage ≤ 0.1 L/min at rated pressure.

4. High Power-to-Weight Ratio with Compact System Design
The 4WE6 series features a compact design weighing only approximately 1.45 kg (single solenoid), offering a high power-to-weight ratio. When used with Rexroth sandwich plates and multi-port subplates, compact and cost-effective system designs are achieved. The multi-fluid compatible NBR seals are compatible with HL, HLP, HLPD, HVLP, HVLPD, and HFC hydraulic fluids.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every 4WE6 series valve undergoes 100% bench testing prior to shipment, covering 350 bar rated pressure holding, directional response time measurement, internal leakage verification, and solenoid response characterization. Mounting dimensions, port positions, electrical interfaces, and performance curves are strictly matched to the original Rexroth valve, with a mounting surface conforming to ISO 4401-03-02-0-05, enabling direct drop-in replacement without modifying piping or control programs. The 4WE6 series is dimensionally interchangeable with Huade 4WE6, Yuken DSG-01, and Parker D1VW series valves at the same CETOP 3 frame size.

Application Areas

• Injection Molding Machines: Mold opening/closing direction control, ejector system control

• Machine Tools: CNC hydraulic clamping systems, tool changer control

• Hydraulic Presses: Main cylinder directional control, fast/slow speed switching

• Construction Machinery: Mini excavators, loader auxiliary hydraulic circuits

• Metallurgical Equipment: Continuous casting machines, rolling mill auxiliary directional control

• Marine Hydraulics: Steering gear control, deck machinery hydraulic systems

• Testing Equipment: Material testing machine hydraulic loading direction control

• Wind Power Generation: Pitch control system hydraulic directional control

Expert Maintenance Tips

Installation Guidelines

1. The 4WE6 series can be mounted in any position. Mounting surface flatness must be ≤ 0.05 mm. Use grade 12.9 M5×50 bolts and tighten diagonally in stages to the specified torque value. Note: Bolts and plugs are not included in the scope of delivery and must be ordered separately.

2. Thoroughly flush all piping circuits before installation. Ensure no welding slag, metal chips, or particulate contaminants remain. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes.

3. Electrical connections must use a K4 connector conforming to DIN EN 175301-803 or Z5L large plug-in connector to maintain IP65 protection. Control signal cables should be shielded, with the shield grounded at one end.

Routine Maintenance Procedures

1. Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 20/18/15 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits.

2. Solenoid Electrical Inspection: Periodically inspect connectors for seal integrity and terminal tightness. Measure coil resistance and replace the coil if deviation exceeds ± 10%. Coil insulation is Class H; monitor for abnormal temperature rise.

3. Shifting Performance Verification: Periodically check each position for smooth shifting and absence of binding. If shifting response becomes sluggish or internal leakage increases, inspect spool wear and fluid contamination levels.

4. Seal Replacement: Standard NBR seals, compatible with multiple hydraulic fluids. Under normal operating conditions, replace valve seals every 3,000-5,000 operating hours.

5. Tank Port Back Pressure Management: Tank port back pressure must not exceed the permissible value. If system return back pressure is high, inspect the return line for blockage or undersized piping. Controlling back pressure below 50 bar is recommended in system design to reduce spool binding risk and extend valve service life.