4WRKE16W6-200L-3X Rexroth Proportional Valve 200 L/min 350 Bar

Product Overview

The 4WRKE16W6-200L-3X series pilot-operated proportional directional valve (model 4WRKE16W6-200L-3X/6EG24K31/F1D3M) is manufactured to original Bosch Rexroth technical standards. Belonging to the 4WRKE series with size 16 (NG16 / ISO 4401-07), this valve is a high-performance 2-stage electro-hydraulic proportional directional control valve. Featuring a pilot-operated two-stage design conforming to ISO 4401-07-06-0-94 mounting standards, it is equipped with electrical position feedback and integrated on-board electronics (OBE). The proportional solenoid drives the pilot spool, and the pilot pressure then positions the main spool for continuous, precise proportional control of both direction and flow magnitude.

This model employs spool type W6 with a nominal flow rate of 200 L/min (at Δp = 10 bar) and maximum operating pressure of 350 bar (5075 psi). The maximum flow capacity is 460 L/min. The integrated electronics (OBE) provide closed-loop control of the main spool position via an inductive position transducer, ensuring the spool position is independent of flow forces even at large flow rates. This product is dimensionally and functionally identical to the original Rexroth 4WRKE16 series valve, 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, spool position accuracy, flow linearity, and dynamic response characterization.

Technical Specifications (Bulleted List)

General Specifications

• Model: 4WRKE16W6-200L-3X/6EG24K31/F1D3M

• Material No.: R901000254

• Product Series: 4WRKE (Size 16 / NG16 / ISO 4401-07)

• Component Series: 3X (30 to 39 series)

• Spool Symbol: W6

• Design: Pilot-operated, 2-stage proportional directional valve with electrical position feedback and integrated on-board electronics (OBE)

• Mounting Pattern: ISO 4401-07-06-0-94

• Installation Position: Any

Hydraulic Parameters

• Nominal Flow Rate: 200 L/min (at Δp = 10 bar)

• Maximum Flow Capacity: 460 L/min

• Maximum Operating Pressure: 350 bar (5075 psi)

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

• Fluid Temperature Range: -20°C to +80°C

• Filtration: ISO 4406 19/17/14

• Flow Characteristic: Linear (L type)

Pilot Control Parameters

• Pilot Oil Supply: External

• Pilot Oil Drain: External

• Pilot Stage: Single-stage proportional directional pilot valve

• Main Stage Return: Spring centered

Electrical Parameters

• Supply Voltage: 24 VDC

• Command Signal: ±10 V voltage input / 4-20 mA current input

• Solenoid Type: Proportional solenoid with detachable coil

• Integrated Electronics: OBE (On-Board Electronics)

• Electrical Connector: 7-pole (6+PE) per EN 175201-804

• Maximum Supply Current: 1.5 A

• Maximum Power Consumption: 72 W

• Protection Class: IP65

Materials & Construction

• Valve Body: High-strength cast iron

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard)

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• Weight: approx. 11.0 kg

Key Technical Advantages

1. Main Stage Position Closed-Loop Control with Flow Force Compensation
The 4WRKE16W6-200L-3X/6EG24K31/F1D3M features main stage position control, with an inductive position transducer providing real-time monitoring and closed-loop control of the main spool position. This ensures the spool position is independent of flow forces, maintaining precise position control even at large flow rates. This characteristic delivers exceptional control accuracy and stability in medium-to-high flow hydraulic systems, meeting the demands of high-accuracy speed control applications.

2. Integrated OBE Electronics for Simplified System Architecture
The valve integrates the proportional amplifier directly into the valve body (On-Board Electronics), factory-calibrated for minimal deviation across devices in series production. The electrical zero point can be fine-tuned via an accessible potentiometer within the integrated electronics after removing the plug screw from the cover housing. Users can directly drive the spool via a ±10 V voltage signal or 4-20 mA current signal without an external amplifier, significantly simplifying system architecture while minimizing electromagnetic interference on signal transmission.

3. External Pilot Oil Circuit Design for System Flexibility
The valve features external pilot oil supply and external pilot oil drain. The pilot stage is supplied with clean fluid isolated from main line transients, ensuring stability and reliability of pilot control. Pilot flow returns directly to tank, preventing backpressure on the spool driver. This design is particularly suitable for industrial hydraulic systems with significant main circuit pressure fluctuations, effectively improving control accuracy and system stability.

4. Pilot-Operated Two-Stage Control with High Flow Capacity
The valve employs a pilot-operated two-stage control structure where the main spool is positioned by pilot pressure, achieving maximum flow capacity of 460 L/min. The main stage features spring-centered design; with de-energized solenoids, the spool automatically returns to the central position, ensuring a safe system state. The pilot stage employs a single-stage proportional directional pilot valve with optimized metering notches, delivering progressive linear flow characteristics for medium-to-high flow hydraulic systems.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every 4WRKE16W6-200L-3X/6EG24K31/F1D3M valve undergoes 100% bench testing prior to shipment, covering 350 bar rated pressure holding, spool position accuracy calibration, flow-signal linearity verification, internal leakage measurement, and solenoid dynamic response characterization. Mounting dimensions, port positions, electrical interfaces, and performance curves are strictly matched to the original Rexroth valve, with a mounting face conforming to ISO 4401-07-06-0-94, enabling direct drop-in replacement without modifying piping or control programs.

Application Areas

• Injection Molding Machines: Injection speed and holding pressure proportional control, mold closing and injection action precise control

• Hydraulic Presses: Proportional speed and direction regulation for medium-to-high flow hydraulic systems

• Die Casting Machines: Shot speed and intensification pressure precise regulation

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

• Construction Machinery: Excavator and crane hydraulic drive system direction and flow control

• Marine & Offshore: Offshore platform hydraulic control systems

• Precision Machine Tools: Hydraulic clamping systems, feed control

• Testing Equipment: Force-displacement closed-loop control for material testing

Expert Maintenance Tips

Installation Guidelines

1. The 4WRKE16W6-200L-3X series can be mounted in any position. Mounting surface flatness must be ≤ 0.05 mm. Tighten mounting bolts diagonally in stages to the specified torque value. The mounting surface conforms to ISO 4401-07-06-0-94 for direct installation on standard subplates or manifolds.

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. Tank Line Management: Ensure the tank lines do not run dry. Depending on installation conditions, installing a preload valve with approximately 5 bar preload pressure is recommended.

4. Electrical connections must use a 7-pole connector conforming to EN 175201-804 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 19/17/14 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits.

2. Electrical Zero Point Verification: The electrical zero point is factory-set. For fine-tuning, remove the plug screw from the cover housing and adjust via the internal potentiometer. Adjustments should only be conducted by trained specialists.

3. Coil Resistance Verification: Measure solenoid coil resistance every 1,000 operating hours. Deviation from factory value should not exceed ± 10%. Maximum supply current is 1.5 A and maximum power consumption is 72 W; monitor for abnormal temperature rise.

4. Internal Leakage Monitoring: Due to the design principle, pilot-operated proportional valves have inherent internal leakage. An annual internal leakage test is recommended. If leakage exceeds 150% of the factory standard, seal replacement should be scheduled.

5. Pilot Circuit Inspection: External pilot oil supply and drain lines must be kept clean and unobstructed. Periodically check the pilot circuit filter for blockage to ensure stable pilot pressure.