4WRLE16EZ180SJ-3X/G24ETK0/A1M Rexroth Proportional Valve NG16 350 bar

Product Overview

The 4WRLE16EZ180SJ-3X/G24ETK0/A1M (Material No. 0811404319) is a pilot-operated high-response proportional directional valve from Bosch Rexroth’s 4WRLE series. Featuring electrical position feedback and integrated onboard electronics (OBE), this NG16 valve conforms to ISO 4401-07-07-0-05 mounting interface standards.

The 4WRLE series consists of pilot-operated 4/3 directional control valves with a two-stage pilot/main stage control architecture. The pilot valve (NG6) features a control piston and sleeve in servo quality, actuated on one side, with a 4/4 fail-safe position when de-energized. Both the main stage and pilot stage are equipped with electrical position feedback, and the integrated OBE electronics are factory-calibrated and compensated. These valves are ideal for demanding closed-loop applications requiring high control accuracy, dynamic response, and reliability.

The 4WRLE series covers sizes NG10 through NG35, with nominal flow rates ranging from 50 to 1100 L/min (at Δp = 10 bar). The 4WRLE16 offers a nominal flow of 180 L/min (at Δp = 10 bar) and a maximum operating pressure of 350 bar.

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.

Technical Specifications 

4WRLE16EZ180SJ-3X/G24ETK0/A1M (0811404319):

• Model: 4WRLE16EZ180SJ-3X/G24ETK0/A1M

• Material Number: 0811404319

• Brand: Bosch Rexroth

• Valve Type: Pilot-operated high-response proportional directional valve with electrical position feedback and integrated OBE

• Nominal Size: NG16

• Mounting Interface: ISO 4401-07-07-0-05

• Mounting Type: Subplate mounting

• Valve Configuration: 4/3-way directional valve

• Spool Symbol: EZ (E-type spool with Z zero overlap compensation)

• Rated Flow: 180 L/min (at Δp = 10 bar, 5 bar per metering notch)

• Max. Flow: 800 L/min

• Max. Operating Pressure: 350 bar

• Component Series: 3X (30–39 series, installation and connection dimensions unchanged)

• Control Type: Proportional solenoid with integrated OBE

• Supply Voltage: 24 V DC

• Command Signal: ±10 V (A1 type)

• Electrical Connection: 7-pin round connector (6 + PE) per EN 175201-804

• Pilot Oil Supply: Internal supply (E), internal return (T)

• Flow Characteristic: Progressive (S)

• Seal Material: NBR, suitable for mineral oils (HL, HLP)

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

• Weight: Approx. 13 kg

• Protection Class: CE compliant per EMC Directive 2014/30/EU

Key Technical Advantages

1. Dual Position Feedback on Main Stage and Pilot Stage – Ultra-High Control Precision

The 4WRLE series features electrical position feedback on both the main stage and pilot stage. This unique dual-feedback architecture ensures exceptional correlation between spool displacement and command signal, maintaining superior control accuracy and repeatability even under load fluctuations and oil temperature variations—making it the ideal choice for closed-loop control applications.

2. Servo-Quality Pilot Stage Design – High Frequency Response

The pilot valve features NG6 size with a control piston and sleeve in servo quality, actuated on one side. The servo-quality machining precision and clearance control endow the valve with extremely high frequency response characteristics, enabling precise direction and flow control even in rapid cycling applications.

3. Integrated OBE Electronics – Factory Calibration and Electronic Compensation

The valve integrates onboard electronics (OBE) that are factory-calibrated and compensated. Supporting ±10 V standard control signal input, no external amplifier is required. This integrated design significantly simplifies system wiring, reduces potential failure points, and lowers system costs.

4. Progressive Flow Characteristics with Zero Overlap Compensation – Sensitive Flow Adjustment

The valve features progressive (S-type) flow characteristics combined with J-type zero overlap compensation signal, enabling sensitive flow regulation near the null position. This design offers significant advantages in applications requiring fine flow control.

5. Broad Size Coverage and Modular Design – Versatile Application Support

The 4WRLE series covers five sizes from NG10 to NG35, with nominal flow rates from 50 to 1100 L/min. All sizes conform to ISO 4401 mounting interface standards, and the modular design ensures consistent installation and maintenance practices across the entire series.

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

The valve strictly adheres to Bosch Rexroth’s original mounting dimensions and functional specifications, with ISO 4401-07-07-0-05 interface compliance. 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 – High-precision closed-loop proportional control of injection speed and holding pressure

• Hydraulic Presses – Precision closed-loop control of slide position, velocity, and pressure

• Metallurgical Equipment – High-frequency response direction and flow control in rolling mill AGC (Automatic Gauge Control) systems

• Test Rigs and Simulation Systems – High-precision dynamic hydraulic excitation for laboratory and production testing

• Machine Tools – Precision direction and flow control for table feed and positioning

• Closed-Loop Position and Velocity Control Systems – Demanding industrial applications requiring high control accuracy and dynamic response

Expert Maintenance Tips

1. Fluid Cleanliness Management

4WRLE series valves have extremely stringent fluid cleanliness requirements. The spool-to-sleeve clearance is extremely tight (servo quality)—even minor contaminants can cause spool sticking or degraded position feedback accuracy. Maintain system fluid cleanliness to ISO 4406 16/14/11 or better. Install high-pressure filters with a minimum rating of 10μm (β₁₀≥75) upstream of the valve.

2. Pilot Oil Supply and Return Configuration Verification

The “ET” designation in the model code indicates internal pilot oil supply (x = internal) and internal pilot oil return (y = internal). Verify that the system’s pilot supply and return configuration matches this specification prior to installation. Incorrect pilot supply configuration will result in valve malfunction or abnormal response.

3. Electrical Connections and Signal Matching

The valve features a 7-pin round connector (6 + PE) per EN 175201-804 with ±10 V command signal (A1 type). Verify that the command signal type and supply voltage (24 V DC) match the system specifications prior to installation. Use shielded cables for control signal transmission with reliable single-point grounding to effectively suppress electromagnetic interference.

4. Installation and Sealing

Carefully review the Bosch Rexroth product documentation (RE 29089) prior to installation. Ensure the mounting surface is flat and smooth, and tighten mounting bolts evenly to specified torque. The mounting interface conforms to ISO 4401-07-07-0-05. Properly install NBR seals without damage or omission.

5. Commissioning and Parameter Configuration

Nominal values are factory-calibrated. During initial commissioning, test spool actuation with low-voltage signals first, then gradually increase signal amplitude after confirming normal operation. Parameter adjustments can be made using appropriate software tools if required.

6. Periodic Inspection and Maintenance

Regularly verify the valve’s flow-current characteristic curve and step response time. If abnormal response, increased hysteresis, or reduced repeatability is detected, inspect the OBE electronics unit functionality and check for spool sticking. For systems that have been idle for extended periods, perform thorough system circulation filtration before restart to ensure fluid cleanliness meets requirements.