4WE6E6X/EG24N9K4 | Rexroth Solenoid Valve 350bar 80L/min NG6

Product Overview

The 4WE6E6X/EG24N9K4 is a Bosch Rexroth 4WE6 series direct-operated solenoid directional valve, NG6 (CETOP 3 / NFPA D03) size, with mounting pattern conforming to ISO 4401-03-02-0-05. This 4/3-way directional valve features E spool type — all ports fully closed in neutral position — with direct-operated wet-armature solenoid construction.

The 4WE6 series is Bosch Rexroth‘s most iconic solenoid directional valve product line, widely recognized as the “gold standard” in global industrial hydraulics. The valve body is constructed from spheroidal cast iron with steel internal components and NBR seals. The cast internal flow passages effectively reduce pressure drop and increase flow capacity — nearly double that of other valves of the same size.

As an original Bosch Rexroth 4WE6 series solenoid directional valve, this product offers complete interchangeability with Parker, Eaton/Vickers, Atos, Yuken, and other major brands — requiring no modifications to mounting interfaces or piping layouts.

Model Code Breakdown (4WE6E6X/EG24N9K4):

• 4WE: 4-way solenoid directional valve (4/3- or 4/2-way version)

• 6: Nominal Size NG6 (6 mm)

• E: Spool Type E — all ports fully closed in neutral

• 6X: 6X Series (60–69, unchanged installation and connection dimensions)

• E: With wet-type solenoid (wet-pin solenoid)

• G24: DC 24V supply (G = DC)

• N9: With concealed manual override

• K4: Without mating connector / connection box

Technical Specifications 

4WE6E6X/EG24N9K4 Specifications:

• Model: 4WE6E6X/EG24N9K4

• Material Number: R900561278

• Brand: BOSCH REXROTH

• Series: 4WE6 Series

• Product Type: Direct Operated Solenoid Directional Valve

• Spool Configuration: 4/3-way

• Spool Type: E — all ports fully closed in neutral

• Nominal Size: NG6 (6 mm)

• Mounting Standard: ISO 4401-03-02-0-05 / CETOP 3 / NFPA D03

• Mounting Type: Subplate Mounting

• Maximum Operating Pressure: 350 bar (5075 psi) 

• Maximum Flow Rate (DC): 80 L/min (21 GPM) 

• Maximum Flow Rate (AC): 60 L/min 

• Recommended Flow: ≤40 L/min (suggested)

• Power Consumption (DC): 30 W 

• Coil Voltage: 24V DC 

• Voltage Tolerance: ±10% 

• Solenoid Type: Wet-Pin Solenoid, 90° rotatable

• Electrical Connector: 3-pin device plug (2 + PE) per DIN EN 175301-803

• Protection Class: IP65

• Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HFC

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

• Viscosity Range: 2.8–500 mm²/s 

• Body Material: Spheroidal Cast Iron

• Internal Parts: Steel

• Seals: NBR

• Manual Override: Equipped (concealed)

• Certifications: CE (Low Voltage Directive 2014/35/EU), CSA, UL (UR marking)

• Weight: 1.98 kg 

• Mounting Bolts: M5×50 (4 bolts, strength class 12.9)

Key Technical Advantages

1. E Spool Type — Precise Actuator Positioning and Locking

The 4WE6E6X/EG24N9K4 features E spool type — all ports P, A, B, and T are fully closed in neutral. This center position ensures the hydraulic actuator is precisely positioned and locked when de-energized, with no position drift due to oil leakage. Ideal for applications requiring strict position holding in neutral — such as machine tool worktable positioning and heavy load lifting/holding.

2. Direct-Operated Wet-Armature Solenoid Design for Quiet, Long-Life Operation

The 4WE6E6X/EG24N9K4 features a wet-armature solenoid directly actuating the control spool. The movable iron core operates fully submerged in hydraulic oil, providing lubrication to reduce wear and cushioning against switching impact and vibration. The solenoid coil can be rotated 90° for flexible electrical connection orientation.

3. 350 bar High Pressure and 80 L/min High Flow in Compact NG6 Size

Delivers 350 bar peak operating pressure and 80 L/min (DC) flow capacity in a compact NG6 valve body. Tank port allowable back pressure reaches 160 bar (AC) / 210 bar (DC) . The cast internal flow passages effectively reduce pressure drop — offering nearly double the flow capacity of other valves of the same size.

4. Reliable Manual Override and IP65 Protection

Features a concealed manual override for emergency operation during power failure. The manual override can be operated at 5–10 bar pressure. IP65 protection is achieved with properly installed connector, effectively resisting dust and water ingress.

5. International Standard Compliance for Global Interchangeability

Mounting conforms to ISO 4401-03-02-0-05 / CETOP 3 / NFPA D03 international standards. The 4WE6 series offers complete interchangeability with Parker, Eaton/Vickers, Atos, Yuken, and other major brands. CE certification (Low Voltage Directive 2014/35/EU), CSA, and UL (UR marking) ensure compliance with international safety standards.

6. Extended Service Life and High Reliability

The 4WE6 series has passed fatigue life and endurance testing exceeding 10 million cycles. The spheroidal cast iron body and precision-ground steel spool ensure extremely low internal leakage and long-term shifting accuracy. Operating temperature range covers -30°C to +80°C for diverse extreme climate conditions.

Application Areas

4WE6E6X/EG24N9K4 (E Spool — All Ports Closed in Neutral):

• CNC Machine Tools — Precision worktable positioning and locking control

• Injection Molding Machinery — Directional and positioning control for clamping, injection, and ejection cylinders

• Hydraulic Presses and Forging Equipment — Press slide position holding and control

• Die-Casting Machines — Directional and positioning control for high-pressure casting equipment

• Metallurgical Equipment — Precision directional and position control for rolling mill hydraulic systems

• Heavy Lifting Equipment — Lifting position holding and locking control

• Industrial Automation Production Lines — Hydraulic actuator control requiring precision position holding

Expert Maintenance Tips

1. Installation Guidelines

• Mounting surface must conform to ISO 4401-03-02-0-05 / CETOP 3 / NFPA D03 standards.

• Use 4 M5×50 mounting bolts, strength class 12.9.

• Thoroughly clean the mounting surface and all ports (P, A, B, T) before installation to prevent foreign particles from entering and causing spool sticking or seal damage.

• The solenoid coil can be rotated 90° — adjust coil orientation according to wiring requirements.

• K4 suffix indicates without mating connector — users must separately select a compatible connector.

2. Hydraulic Fluid Cleanliness

• Compatible fluids: HL, HLP, HLPD, HVLP, HVLPD, HFC.

• Fluid temperature range: -30°C to +80°C .

• Viscosity range: 2.8–500 mm²/s .

• Install a return line filter with minimum 10 μm filtration rating.

• Seals are NBR — for phosphate ester or other specialty fluids, select FKM seal option.

3. Electrical Connection Specifications

• 4WE6E6X/EG24N9K4 uses 24V DC supply with voltage tolerance of ±10% .

• Power consumption: 30 W .

• Electrical connector: 3-pin device plug (2 + PE) per DIN EN 175301-803.

• Ensure the connector is fully locked to maintain IP65 protection.

4. E Spool Type Usage Considerations

• E spool type features all ports fully closed in neutral — the actuator is locked when de-energized with no position drift.

• Suitable for applications requiring precise actuator positioning and holding.

• For applications requiring free actuator movement in neutral, select J type (P blocked, A&B to T) or H type (all ports open).

5. Periodic Maintenance Inspection

• Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.

• Check electrical connectors for looseness, oxidation, or moisture ingress.

• Wet-armature solenoid coils can be replaced quickly without disturbing hydraulic connections.

• If response lag or unstable shifting is observed, first check system fluid cleanliness and verify the spool is not sticking.

• Periodically test the manual override function to ensure emergency availability.