4WE6E7X/HG24N9K4 Rexroth Solenoid Directional Valve NG6 315 bar 60 L/min

Product Overview

The 4WE6 series and 4WE10 series are direct-operated solenoid directional valves from Bosch Rexroth, representing one of the most widely used directional valve product lines in industrial hydraulics. The 4WE6E7X/HG24N9K4 (Material No. R901087087) is a typical NG6 model (CETOP D03 / ISO 4401-03-02-0-05 mounting interface), while the 4WE10E3X/CG24N9K4 is the corresponding NG10 model (ISO 4401-05-04-0-05).

WE-type directional valves are solenoid-actuated directional spool valves that control the start, stop, and direction of fluid flow. The directional valve basically consists of the housing (1), one or two solenoids (2), the control spool (3), and one or two return springs (4). In the de-energized condition, the control spool is held in the central position or initial position by the return springs. When energized, the wet-pin solenoid acts via the plunger on the control spool, pushing it to the required end position to release the desired flow direction. After de-energization, the return spring pushes the control spool back to its rest position.

As a direct OEM-replacement solution, this valve maintains 100% mechanical and functional interchangeability with the original Rexroth unit. Every valve undergoes rigorous simulation testing—including pressure cycling, thermal variation, and full-stroke endurance validation—to guarantee factory-grade performance. Ideal for industrial hydraulic systems demanding high reliability, fast response, and long service life.

Technical Specifications 

4WE6 Series (NG6 / CETOP D03):

• Typical Models: 4WE6E7X/HG24N9K4, 4WE6F7X/HG24N9K4, 4WE6G7X/HG24N9K4, 4WE6H7X/HG24N9K4, 4WE6J7X/HG24N9K4, 4WE6L7X/HG24N9K4, 4WE6M7X/HG24N9K4, 4WE6EA7X/HG24N9K4, 4WE6HA7X/HG24N9K4, 4WE6JA7X/HG24N9K4, 4WE6EG7X/HG24N9K4

• Brand: Bosch Rexroth

• Valve Type: Direct operated solenoid directional spool valve

• Nominal Size: NG6 (CETOP D03)

• Mounting Interface: ISO 4401-03-02-0-05

• Mounting Type: Subplate mounting

• Valve Configuration: 4/3, 4/2, or 3/2-way

• Spool Symbols: E, F, G, H, J, L, M, EA, HA, JA, EG

• Max. Operating Pressure: 315 bar (31.5 MPa)

• Max. Flow: 60 L/min

• Component Series: 7X

• Control Type: Wet-pin DC solenoids

• Coil Voltage: 24 V DC

• Electrical Connection: Connector per EN standards

• Seal Material: NBR or FKM (depending on model)

• Compatible Fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR

• Manual Override: Concealed manual override

• Weight: Approx. 1.6 kg

• Coil Protection Class: IP65

4WE10 Series (NG10 / CETOP D05):

• Typical Models: 4WE10E3X/CG24N9K4, 4WE10G3X/CG24N9K4, 4WE10J3X/CG24N9K4

• Brand: Bosch Rexroth

• Valve Type: Direct operated solenoid directional spool valve

• Nominal Size: NG10 (CETOP D05)

• Mounting Interface: ISO 4401-05-04-0-05

• Mounting Type: Subplate mounting

• Valve Configuration: 4/3, 4/2, or 3/2-way

• Spool Symbols: E, G, J

• Max. Operating Pressure: 315 bar (31.5 MPa)

• Max. Flow: 120 L/min

• Component Series: 3X

• Control Type: Wet-pin DC solenoids

• Coil Voltage: 24 V DC

• Electrical Connection: Connector per EN standards

• Seal Material: NBR or FKM (depending on model)

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

• Manual Override: Optional auxiliary operating device

• Weight: Approx. 6 kg

Key Technical Advantages

1. Wet-Pin Solenoid Design – Long Service Life and High Reliability

The 4WE6 and 4WE10 series utilize wet-pin DC solenoids, with the plunger fully immersed in pressure oil. This design effectively lubricates moving parts, reduces friction and wear, and significantly improves solenoid heat dissipation, extending solenoid service life. The solenoid coil is rotatable by 90° and can be replaced without opening the pressure-tight chamber, greatly simplifying maintenance operations.

2. Direct-Operated Design – Fast Response with No Pilot Delay

The direct-operated structure, with solenoids directly actuating the spool, eliminates pilot stage requirements for fast response and reliable shifting. Compared to pilot-operated directional valves, the direct-operated design offers superior shifting response in small-to-medium flow applications and has relatively less stringent fluid cleanliness requirements.

3. Multiple Spool Symbols and Configurations – Versatile Control Options

The 4WE series offers a wide range of standard spool symbols including E, F, G, H, J, L, M (4/3-way), as well as special symbols EA, HA, JA, EG (4/2-way). Different spool symbols correspond to different P→A/B→T flow configurations and center positions, accommodating diverse application requirements from simple bidirectional actuator control to complex differential circuit applications.

4. Premium Materials and Sealing Standards – Broad Fluid Compatibility

Manufactured with high-strength materials, the valve offers seal options of NBR or FKM, compatible with a wide range of hydraulic fluids including mineral oils (HL, HLP, HVLP), environmentally friendly fluids (HETG, HEES), and fire-resistant fluids (HFDU, HFDR). This broad media compatibility enables application across diverse industrial environments.

5. Drop-In Interchangeability – Minimized Downtime and Retrofit Costs

The valve strictly adheres to Bosch Rexroth’s original mounting dimensions and functional specifications. The 4WE6 series complies with ISO 4401-03-02-0-05, and the 4WE10 series complies with ISO 4401-05-04-0-05. Whether for new system design or legacy system upgrades, this valve offers 100% mechanical and electrical interchangeability with the original Rexroth unit—eliminating the need for manifold modifications or piping changes, significantly reducing downtime and retrofit expenses.

Application Areas

• Injection Molding Machinery – Directional switching and sequence control for hydraulic actuators

• Machine Tool Hydraulic Systems – Directional control for table reciprocation and tool feed/retract

• Hydraulic Presses – Directional switching for slide lifting and pressing operations

• Metallurgical Equipment – Directional and sequence control in rolling mill hydraulic systems

• Material Handling Equipment – Directional control for forklifts and lifting platforms

• Mobile Equipment – Directional switching and logic control for work attachments

• Packaging Machinery – Sequence control and directional switching for actuators

• Industrial Automation Lines – Directional switching and logic control for hydraulic actuators

Expert Maintenance Tips

1. Ensure Solenoid Pressure Chamber is Oil-Filled

Proper operation of wet-pin solenoids requires the pressure chamber to be completely filled with oil. During initial installation or after extended shutdown, perform air bleeding to ensure no air remains trapped in the solenoid chamber. Air entrapment will affect solenoid thrust characteristics and response speed, and may lead to solenoid burnout in severe cases.

2. Fluid Cleanliness Management

Maintain system fluid cleanliness to ISO 4406 18/16/13 or better. The clearance between spool and bore is extremely tight (typically 0.003–0.005 mm)—contaminants can cause spool sticking or abnormal wear. Install filters with a minimum rating of 10μm upstream of the valve.

3. Electrical Connections and Voltage Matching

The standard coil voltage for this series is 24 V DC. Verify that the supply voltage matches the valve’s electrical specifications prior to installation—DC solenoids must never be connected to AC power, as this will cause rapid coil burnout. Use shielded cables for control signal transmission with reliable single-point grounding to effectively suppress electromagnetic interference.

4. Internal Leakage Characteristics

Due to the design principle, WE-type directional valves have inherent internal leakage, which may increase over the service life. For applications requiring zero leakage in holding or positioning functions, consider using pilot-operated check valves or sandwich-type check valves in combination.

5. Installation and Sealing

Carefully review the Bosch Rexroth product documentation prior to installation. Ensure the mounting surface is flat and smooth, and tighten mounting bolts evenly to specified torque. The 4WE6 series uses M5 mounting bolts (torque approx. 7–9 Nm), while the 4WE10 series uses M6 mounting bolts (torque approx. 12–15 Nm). Take care not to damage or omit seals during assembly.

6. Periodic Inspection and Maintenance

Regularly verify the valve’s shifting response time and pressure drop characteristics. If sluggish response or abnormal heating is detected, inspect the solenoid condition and check for spool sticking. For systems that have been idle for extended periods, perform thorough system circulation filtration and air bleeding before restart.

Related models：

3WE6A61B/CG12N9Z4