4WE6J6X Rexroth Solenoid Directional Valve 80 L/min 350 Bar

Product Overview

The 4WE6J series solenoid directional valve (including models 4WE6J6X/EG24N9K4/B10 and 4WE6J53/AG24NK4) 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-A6. It employs wet-pin DC solenoids with concealed manual override and is available with various standard spool types.

The 4WE6J6X/EG24N9K4/B10 features spool symbol J (4/3-way, spring-centered, P blocked and A/B connected to T in center), equipped with 24 VDC high-power wet-pin solenoids, concealed manual override (N9), and K4 electrical connector (per DIN EN 175301-803). The 4WE6J53/AG24NK4 features the same J-type spool function with 24 VDC solenoids. The valve body is made of high-strength spheroidal cast iron with steel internal parts and NBR seals, offering excellent pressure resistance and durability. Maximum operating pressure is 350 bar (5075 psi) on ports P/A/B, with 210 bar (3045 psi) on port T and maximum flow of 80 L/min (DC 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: 4WE6J6X/EG24N9K4/B10 / 4WE6J53/AG24NK4

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

• Design Series: 6X (60 to 69 series)

• Spool Symbol: J type (4/3-way, spring-centered, P blocked and A/B connected to T in center)

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

• Ways/Positions: 4-way, 3-position

• 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 Tank Port Pressure (Port T): 210 bar (3045 psi)

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

• Nominal Flow: 80 L/min (at Δp = 5 bar)

• Hydraulic Fluid: Mineral-based hydraulic oil (HL, HLP) per DIN 51524; HFA, HFB, HFC, HFDR supported

• 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: < 0.3 L/min (at 350 bar)

Electrical Parameters

• Supply Voltage: 24 VDC (G24)

• Rated Current: 1.25 A (24 VDC)

• Coil Power Consumption: 34 W (at nominal voltage)

• Voltage Tolerance: ± 10%

• Solenoid Type: High-power wet-pin solenoid, detachable coil, rotatable by 90°

• Coil Insulation Class: Class H

• Maximum Coil Surface Temperature: 120°C

• Electrical Connector: K4 type (DIN EN 175301-803)

• Protection Class: IP65 (with standard connector)

• Duty Cycle: Continuous (ED = 100%)

• Manual Override: Concealed (N9)

Performance Data

• Response Time (DC solenoid, energizing): 25-40 ms (no ramps)

• Response Time (DC solenoid, de-energizing): 20-35 ms

• Full Stroke Shifting Time: 40-70 ms (no load)

• Hysteresis: < 10% (of activation pressure)

• P-Port Throttle Insert: 1.0 mm (integrated throttle insert for improved spool stability)

Materials & Construction

• Valve Body: High-strength spheroidal cast iron

• Internal Parts: Steel

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard), suitable for HFC hydraulic fluids

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• Single solenoid models: approx. 1.45 kg (3.2 lb)

• Double solenoid models: approx. 1.95 kg (4.3 lb)

Key Technical Advantages

1. Wet-Pin Solenoid Design for High Reliability
The 4WE6J series employs a wet-pin solenoid design where the armature operates in hydraulic fluid, effectively reducing shifting impact noise and wear while improving heat dissipation. Wet-pin 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. J-Type Spool Function for Load Holding Capability
The J-type spool in the spring-centered (neutral) position blocks port P and connects ports A/B to tank (port T). This function enables the actuator’s two working chambers to connect to the return line in the neutral position, achieving a free-floating state for the actuator, particularly suitable for hydraulic circuits requiring load holding or rapid unloading. The control spool is precision-ground from carburized steel with micron-level clearance control, ensuring low internal leakage and responsive shifting performance.

3. High-Power Solenoid with Flexible Installation
The valve features high-power wet-pin solenoids with coils 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. A concealed manual override (N9) is provided for commissioning and maintenance under power-off conditions. An integrated 1.0 mm throttle insert in port P improves spool stability and suppresses hydraulic shock.

4. High Power-to-Weight Ratio with Compact System Design
The 4WE6J series features a compact design, with single solenoid models weighing only approximately 1.45 kg and double solenoid models approximately 1.95 kg, 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. Sandwich plate mounting (pressure valves, flow control valves, and check valves) allows stacking into compact circuits, maximizing installation space savings.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every 4WE6J 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 4WE6J series is dimensionally interchangeable with Huade 4WE6J, Yuken DSG-01 series, 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 4WE6J 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 7 N·m. 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 to maintain IP65 protection. Control signal cables should be shielded, with the shield grounded at one end.

4. The solenoid coil can be rotated by 90°. Adjust the coil angle according to the actual wiring direction before tightening.

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%. Rated current is 1.25 A and coil power is 34 W; 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 exceeds 0.3 L/min @ 350 bar, inspect spool wear and fluid contamination levels.

4. Seal Replacement: Standard NBR seals compatible with mineral-based and HFC 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 210 bar (3045 psi). If system return back pressure is high, inspect the return line for blockage or undersized piping.

6. Manual Override Maintenance: Periodically check that the concealed manual override (N9) is in the non-activated state to prevent accidental spool shifting.