4WREE6V16-2X/G24K31/A1V
Product Overview
The 4WREE6V16-2X/G24K31/A1V 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 V 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 (4WREE6V16-2X/G24K31/A1V):
4WREE: Direct-operated proportional directional valve with electrical position feedback and integrated electronics (OBE)
6: Nominal Size NG6 (6 mm)
V: Spool Symbol V
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 — Analog, command value ±10V
A1V: Seal material and option code (FKM seals)
Technical Specifications
Model: 4WREE6V16-2X/G24K31/A1V
Material Number: R900925657
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 V
Nominal Size: NG6 (6 mm)
Mounting Standard: ISO 4401-03-02-0-05 / CETOP 3 / NFPA D03
Mounting Type: Subplate Mounting
Number of Ports: 4 main ports
Switching Positions: 3 positions
Maximum Operating Pressure: 350 bar (5075 psi)
Maximum Flow: 80 L/min
Nominal Flow: 16 L/min
Supply Voltage: 24V DC
Command Value Input: Analog, ±10V
Electrical Connector: 7-pin device plug (6 + PE) per EN 175201-804
Protection Class: IP65 (with properly installed connector)
Seal Material: FKM (Fluoroelastomer)
Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR
Weight: 2.44 kg
4WREE6E16-2X/G24K31/A1V-655
Product Overview
The 4WREE6E16-2X/G24K31/A1V-655 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) . 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)
2X: 2X Component Series (20–29)
G24: DC 24V supply (G = DC)
K31: Control electronics interface configuration — Analog, command value 0–10V
A1V: Seal material and option code (FKM seals)
655: Factory internal configuration code
Technical Specifications (Bulleted List)
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 P/A/B: 315 bar (4568 psi)
Maximum Flow: 180 L/min
Nominal Flow: 16 L/min
Supply Voltage: 24V DC
Command Value Input: Analog, 0–10V
Electrical Connector: Device plug per EN standard
Protection Class: IP65 (with properly installed connector)
Seal Material: FKM (Fluoroelastomer)
Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR
Switching Positions: 2 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 ±10V or 0–10V command signals. This significantly simplifies the electrical control architecture of hydraulic systems, reduces external component count, minimizes system failure points, and reduces wiring complexity.
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 compared with the command value, continuously correcting spool position to ensure 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. Positive overlap design ensures precise control at low pressure ranges with minimal leakage.
4. FKM Seals for Broad Fluid Compatibility
Both 4WREE6V16-2X/G24K31/A1V and 4WREE6E16-2X/G24K31/A1V-655 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 for phosphate esters and other specialty fluids.
5. 350 bar / 315 bar High Pressure with High Flow Capacity
4WREE6V16-2X/G24K31/A1V delivers 350 bar maximum operating pressure and 80 L/min maximum flow in a compact NG6 package. 4WREE6E16-2X/G24K31/A1V-655 delivers 315 bar maximum operating pressure and 180 L/min maximum flow. These valves are among the highest-performing direct-operated proportional directional valves in their class.
6. International Standard Compliance for High Installation Compatibility
4WREE series mounting conforms to ISO 4401-03-02-0-05 / CETOP 3 / NFPA D03 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 / NFPA D03 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.
Tighten mounting bolts evenly to the specified torque to ensure proper O-ring sealing between the valve body and mounting surface.
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. Verify supply voltage matches coil rated voltage before connection.
4WREE6V16-2X/G24K31/A1V command value input: ±10V. 4WREE6E16-2X/G24K31/A1V-655 command value input: 0–10V.
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 affecting control precision.
4. Pilot Supply and Leakage Oil
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.
Solenoid coils can be replaced without disturbing hydraulic connections.
