4WREE6E16-3X/V/24A1-655 Rexroth Proportional Valve

Model Number	4WREE6E16-3X/V/24A1-655

Product Description

Product Overview

The Bosch Rexroth 4WREE6E16-3X/V/24A1-655 is a direct-operated proportional directional valve from the 4WREE 3X series, designed for electronic flow and directional control in industrial hydraulic systems.

The valve uses electrical spool-position feedback and integrated onboard electronics (OBE). This closed-loop architecture continuously monitors spool position and regulates the proportional solenoids to achieve repeatable hydraulic flow control. Rexroth identifies the 4WREE 3X platform as a Size 6 proportional directional valve with a maximum operating pressure of 350 bar and a maximum flow capability of 80 L/min.

The exact 4WREE6E16-3X/V/24A1-655 configuration is identified with:

E spool
16 L/min nominal flow
24 VDC supply
±10 V command signal
FKM seals
7-pin electrical connector
approximately 2.65 kg weight.

The 16 L/min figure is the specific rated-flow configuration at Δp = 10 bar. The 80 L/min value represents the maximum recommended flow capability of the Size 6 4WREE 3X platform and should not be presented as the normal rated flow of this exact model.

Our replacement valves are manufactured with emphasis on OEM dimensional interchangeability and undergo 100% simulated operating-condition testing, including command response, spool movement, position feedback, pressure performance and leakage verification.

Technical Specifications (Bulleted List)

Manufacturer: Bosch Rexroth
Product Family: 4WREE
Complete Model: 4WREE6E16-3X/V/24A1-655
Valve Type: Proportional Directional Control Valve
Construction: Direct Operated
Control: Electrical Proportional Control
Feedback: Electrical Spool-Position Feedback
Electronics: Integrated Onboard Electronics (OBE)
Nominal Size: NG06 / Size 6
Spool Symbol: E
Rated Flow: 16 L/min at Δp = 10 bar
Maximum Operating Pressure, P/A/B: 350 bar
Maximum Operating Pressure, T: 210 bar
Recommended Maximum Flow: 80 L/min
Supply Voltage: 24 VDC
Command Signal: ±10 V
Electrical Connector: 7-pin, 6 + PE
Electronic Interface: A1
Mounting: Subplate
Mounting Standard: ISO 4401
Seal Material: FKM
Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR
Recommended Viscosity: 30–46 mm²/s
Permitted Viscosity: 20–380 mm²/s
Maximum Contamination Level: ISO 4406 Class 20/18/15
Protection Class: IP65 with properly installed and locked connector
Weight: Approximately 2.65 kg
Displacement: Not applicable
Maximum Rotational Speed: Not applicable

The core 4WREE 3X specifications are confirmed by Bosch Rexroth’s official product selector and technical documentation.

Key Technical Advantages

Closed-Loop Spool Position Feedback

Unlike a simple open-loop proportional valve, the 4WREE uses electrical spool-position feedback. This allows the onboard electronics to monitor the actual spool position and improve command-to-flow repeatability.

Integrated Onboard Electronics

The OBE electronics are integrated into the valve, eliminating the need for a separate basic proportional amplifier for standard operation. This reduces external control hardware and simplifies system integration.

350 bar Pressure Capability

The Size 6 4WREE 3X platform is rated for up to 350 bar at the P, A and B ports, supporting demanding industrial hydraulic applications. The T port is rated at 210 bar.

16 L/min Rated Flow Configuration

The E16 configuration provides a 16 L/min rated flow at a 10 bar valve pressure differential, providing a defined flow class for system sizing and replacement selection.

Precision E-Spool Flow Control

The E spool provides proportional metering characteristics, allowing the effective hydraulic flow area to change continuously with spool position and electrical command. Rexroth provides dedicated flow characteristics for the different spool configurations.

FKM Sealing

The V designation identifies the FKM seal configuration. This is appropriate for applications requiring fluorocarbon elastomer sealing, subject to hydraulic-fluid and temperature compatibility verification.

Standard NG06 Interface

The Size 6 / ISO 4401 mounting interface allows straightforward integration into standardized industrial hydraulic manifolds and subplates.

Application Areas

Typical applications include:

CNC Machine Tools
Hydraulic Presses
Metal Forming Equipment
Plastic Processing Machinery
Industrial Automation
Hydraulic Positioning Systems
Material Handling Machinery
Hydraulic Test Benches
Industrial Production Equipment
Electronically Controlled Hydraulic Cylinders

Expert Maintenance Tips

Verify the Complete Ordering Code

Always verify the complete model rather than ordering only a generic 4WREE6 valve.

The replacement must match:

Spool type
Rated flow
Component series
Seal material
Supply voltage
Command interface
Electrical connector
Additional suffix configuration

Rexroth’s official selector independently defines the 16 L/min flow, FKM seal, 24 VDC supply and A1 ±10 V interface.

Match the ±10 V Command Signal

The A1 electronic interface uses a ±10 V command input. A 4–20 mA controller should not be connected directly to this valve unless an appropriate signal interface is provided.

Maintain a Stable 24 VDC Supply

The nominal supply voltage is 24 VDC, with the series documentation specifying an operating range of approximately 19.4–35 V. Excessive supply ripple or transient interference can affect the onboard electronics.

Maintain Hydraulic Cleanliness

Maintain the hydraulic fluid within the specified ISO 4406 Class 20/18/15 cleanliness level. Contamination can increase spool friction, affect position feedback and reduce proportional repeatability.

Understand the Mechanical Center Position

Rexroth notes that the mechanically spring-centered spool position is not necessarily identical to the hydraulic center position for every spool symbol. With the electronic control loop active, the spool is positioned according to the hydraulic center reference.

Do Not Open the Adjustment Hardware

Rexroth explicitly warns that the PG fitting must not be opened and that unauthorized mechanical adjustment of the internal adjustment nut can damage the valve.