4WREE6E16-2X/G24K31/A1V-655
Product Overview
The 4WREE6E16-2X/G24K31/A1V-655 (Material Number R900950342) is a Bosch Rexroth 4WREE series direct-operated proportional directional valve, NG6 (CETOP 3) size, with mounting pattern conforming to ISO 4401-03-02-0-05. This 4/3-way proportional directional valve features Symbol E spool, direct-operated construction with proportional solenoids featuring central thread and detachable coil.
The 4WREE series is a direct-operated proportional directional valve with electrical position feedback and integrated electronics (OBE) . The solenoids are controlled by the integrated electronics, enabling precise control of flow direction and size via electrical signals. Internal piston position feedback ensures extremely high control accuracy. The -655 suffix denotes a factory internal configuration code.
Model Code Breakdown (4WREE6E16-2X/G24K31/A1V-655):
4WREE: Direct-operated proportional directional valve with electrical position feedback and integrated electronics (OBE)
6: Nominal Size NG6 (6 mm)
E: Spool Symbol E
16: Nominal flow rating (16 L/min @ Δp = 10 bar per control edge)
2X: 2X Component Series (20–29, unchanged installation and connection dimensions)
G24: DC 24V supply (G = DC)
K31: Control electronics interface configuration
A1: Command signal type — 0–10V
V: Seal material — FKM (Fluoroelastomer)
655: Factory internal configuration code
Technical Specifications
Model: 4WREE6E16-2X/G24K31/A1V-655
Material Number: R900950342
Brand: BOSCH REXROTH
Series: 4WREE Series, 2X Component Series
Product Type: Direct-operated proportional directional valve with electrical position feedback and integrated electronics (OBE)
Spool Configuration: 4/3-way
Spool Symbol: Symbol E
Nominal Size: NG6 (6 mm)
Mounting Standard: ISO 4401-03-02-0-05
Mounting Type: Subplate Mounting
Maximum Operating Pressure: 315 bar (4568 psi)
Maximum Flow Rate: 80 L/min
Nominal Flow (@ Δp = 10 bar): 16 L/min
Supply Voltage: 24V DC
Command Value Input: 0–10V (A1)
Electrical Connector: 7-pin device plug (6 + PE) per EN 175201-804
Protection Class: IP65
Seal Material: FKM (Fluoroelastomer)
Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR
Weight: 2.44 kg
Switching Positions: 3 positions
4WREE6E1-16-2X/G24K31/F1V
Product Overview
The 4WREE6E1-16-2X/G24K31/F1V (Material Number R900617482) is a Bosch Rexroth 4WREE series direct-operated proportional directional valve, NG6 (CETOP 3) size, with mounting pattern conforming to ISO 4401-03-02-0-05. This 4/3-way proportional directional valve features Symbol E1 spool, direct-operated construction with proportional solenoids featuring central thread and detachable coil.
The 4WREE series is a direct-operated proportional directional valve with electrical position feedback and integrated electronics (OBE) . The solenoids are controlled by the integrated electronics, enabling precise control of flow direction and size via electrical signals. Internal piston position feedback ensures extremely high control accuracy.
Model Code Breakdown (4WREE6E1-16-2X/G24K31/F1V):
4WREE: Direct-operated proportional directional valve with electrical position feedback and integrated electronics (OBE)
6: Nominal Size NG6 (6 mm)
E1: Spool Symbol E1
16: Nominal flow rating (16 L/min @ Δp = 10 bar per control edge)
2X: 2X Component Series (20–29, unchanged installation and connection dimensions)
G24: DC 24V supply (G = DC)
K31: Control electronics interface configuration
F1: Command signal type — 4–20 mA
V: Seal material — FKM (Fluoroelastomer)
Technical Specifications (Bulleted List)
Model: 4WREE6E1-16-2X/G24K31/F1V
Material Number: R900617482
Brand: BOSCH REXROTH
Series: 4WREE Series, 2X Component Series
Product Type: Direct-operated proportional directional valve with electrical position feedback and integrated electronics (OBE)
Spool Configuration: 4/3-way
Spool Symbol: Symbol E1
Nominal Size: NG6 (6 mm)
Mounting Standard: ISO 4401-03-02-0-05
Mounting Type: Subplate Mounting
Maximum Operating Pressure: 315 bar (4568 psi)
Maximum Flow Rate: 80 L/min
Nominal Flow (@ Δp = 10 bar): 16 L/min
Supply Voltage: 24V DC
Command Value Input: 4–20 mA (F1)
Electrical Connector: 7-pin device plug (6 + PE) per EN 175201-804
Protection Class: IP65
Seal Material: FKM (Fluoroelastomer)
Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR
Weight: 2.44 kg
Switching Positions: 3 positions
Key Technical Advantages (4WREE Series Common)
1. Integrated On-Board Electronics (OBE) — No External Amplifier Required
The 4WREE series comes standard with integrated on-board electronics (OBE) , directly accepting 0–10V (A1) or 4–20 mA (F1) command signals. This significantly simplifies the electrical control architecture, reduces external component count, and minimizes system failure points.
2. Electrical Position Feedback for Extremely High Control Accuracy
The 4WREE series is equipped with electrical position feedback, enabling precise monitoring and control of spool position via internal piston position feedback. The feedback signal is continuously compared with the command value, ensuring extremely high repeatability and minimal hysteresis.
3. Direct-Operated Design for Fast Response
The direct-operated design employs proportional solenoids to directly actuate the control spool with no pilot stage delay. Solenoids feature central thread and detachable coil construction for easy maintenance. Coils can be replaced without opening the pressure-tight chamber.
4. FKM Seals for Broad Fluid Compatibility
Both models are equipped with FKM (fluoroelastomer) seals, compatible with HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR, and other hydraulic fluids. FKM seals offer superior heat and chemical resistance.
5. 315 bar High Pressure with 80 L/min Flow Capacity
Delivers 315 bar maximum operating pressure and 80 L/min maximum flow in a compact NG6 package. This valve is among the highest-performing direct-operated proportional directional valves in its class.
6. International Standard Compliance for High Installation Compatibility
4WREE series mounting conforms to ISO 4401-03-02-0-05, NFPA D03, and CETOP 3 international standards. Fully compatible with globally adopted NG6 interfaces for direct replacement of same-series, same-specification products. The 7-pin device plug (6 + PE) conforms to EN 175201-804.
Application Areas
Injection Molding Machinery — Precise proportional control of injection speed and holding pressure
Die-Casting Machines — Proportional regulation of injection speed and pressure
CNC Machine Tools — Proportional control of spindle feed rates and worktable indexing
Material Testing Machines — Precise proportional control of loading force and displacement
Metallurgical Equipment — Precise position and speed control for rolling mill hydraulic systems
Wind Turbine Systems — Hydraulic proportional control for pitch systems
General Industrial Hydraulic Systems — Various high-precision applications requiring proportional directional and flow control
Expert Maintenance Tips
1. Installation Guidelines
Mounting surface must conform to ISO 4401-03-02-0-05 / CETOP 3 standards.
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.
Important Notice: The PG fitting (11) must not be opened. Mechanical adjustment of the adjustment nut located below is prohibited and damages the valve!
2. Hydraulic Fluid Cleanliness
Recommended fluids: Mineral oils per DIN 51524 (HL, HLP, HLPD, HVLP, HVLPD) or synthetic oils (HETG, HEES, HEPG, HFDU, HFDR).
Recommended fluid cleanliness: ISO 4406 18/16/13 or better.
Install a return line filter with minimum 10 μm filtration rating.
3. Electrical Connection Specifications
Both models use 24V DC supply.
4WREE6E16-2X/G24K31/A1V-655 command value input: 0–10V (A1) .
4WREE6E1-16-2X/G24K31/F1V command value input: 4–20 mA (F1) .
Electrical connector: 7-pin device plug (6 + PE) per EN 175201-804. Ensure the connector is fully locked to prevent contact issues caused by vibration.
Shielded cables are recommended for command signal connections to prevent electromagnetic interference.
4. Tank Line Precautions
The tank line must not be allowed to run empty.
With corresponding installation conditions, a preload valve (preload pressure approx. 2 bar) must be installed.
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.
Periodically inspect OBE electronics status to confirm normal power supply and command signal.
If response lag or reduced control precision is observed, first check system fluid cleanliness and verify the spool is not sticking.
Note: Due to the design principle, internal leakage which may increase over the life cycle is inherent to the valves.
