Rexroth Hydraulic Valve 4WRA6 Series Proportional Directional Valve with Subplate Mounting Cast Steel Material and Threaded Installation

4WRA6E30-2X/G24N9K4/V
4WRA6EA30-2X/G24N9Z4/V
4WRA6E15-2X/G24Z4/V
4WRA6E15-2X/G24K4/V
4WRA6E30-2X/G24K4/V Directional valve, Rexroth proportional hydraulic valve, made in Germany and imported

FAQ:

Frequently Asked Questions (FAQ) for Proportional Directional Valve Series 4WRA6

1. What is the 4WRA6 valve?

The 4WRA6 is a series of direct-operated proportional directional valves manufactured by REXROTH. It is designed as a subplate-mounted component and is typically used to control both the direction and flow rate of hydraulic fluid in a system, thereby managing the direction and speed of hydraulic actuators .

2. What are the main features of the 4WRA6 series?

• Direct-Operated Design: The valve spool is moved directly by proportional solenoids without the need for a pilot pressure stage .

• Spring-Centered Spool: When the solenoids are de-energized, the spool returns to and is maintained in the center position by compression springs .

• Mounting: Subplate mounting with porting interface according to ISO 4401 .

• Two Configurations: Available with external control electronics (4WRA type) or with integrated onboard electronics (OBE) (4WRAE type) .

• Flow Control: Provides proportional flow control with a progressive flow characteristic (metering notch) in addition to direction control .

3. What is the difference between 4WRA and 4WRAE?

The key difference lies in the location of the control electronics.

• 4WRA: Requires an external, separate amplifier to function. The amplifier processes the input signal (e.g., from a PLC) and provides the necessary power to the valve's solenoids .

• 4WRAE: Features Integrated OnBoard Electronics (OBE). The control electronics are built into the valve, allowing it to accept standard analog input signals (e.g., ±10 V or 4-20 mA) directly .

4. How do I read the model number? A typical 4WRA6 model code is structured as follows :

• 4WRA: Series designation for proportional directional valve without OBE. "E" after WRA (4WRAE) indicates integrated electronics.

• 6: Nominal size (06). Alternative size is 10.

• W / E / etc.: Spool symbol/type (e.g., W, E, EA), which defines the flow characteristics and center position condition .

• 07 / 15 / 30: Nominal flow rate in liters per minute at a pressure drop (Δp) of 10 bar. For size 06, common values are 7, 15, or 26/30 L/min .

• 2X: Component series (20-29).

• G24: Supply voltage (24 V DC).

• K4 / K31: Electrical connection type (e.g., without plug, with specific component socket) .

• V: Seal material (e.g., FKM for mineral oil) .

• A1 / F1 (for 4WRAE): Control value input type (A1 for ±10V, F1 for 4-20mA) .

5. What are the key technical specifications?

• Maximum Operating Pressure: Up to 350 bar for P, A, B ports .

• Maximum Flow: Varies with model (e.g., 42 L/min for some 4WRAE6 models) .

• Recommended Fluid Cleanliness: ISO 4406 20/18/15 .

• Voltage: Typically 24 V DC .

6. What are common applications for the 4WRA6 valve?

These valves are used in various industrial hydraulic systems requiring precise control, such as:

• Plastic injection molding machines .

• Presses and bending machines .

• Mobile equipment.

• Industrial automation systems where proportional control of speed and direction is needed.

7. What are common troubleshooting issues?

Common problems and their potential causes include :

• Valve does not shift or responds slowly: Check solenoid coil for burnout or open circuit; check power supply voltage; check for contamination causing the spool to stick.

• Internal Leakage: Worn spool or seals, or contamination causing improper sealing .

• Valve sticking: Often due to inadequate fluid cleanliness, insufficient lubrication, or internal damage .

• Excessive noise: Can be caused by excessive vibration, voltage fluctuations, or issues with the solenoid .

• No function despite signal: Check the amplifier (for 4WRA), wiring, and connections between the control unit and the valve .

Subplate Mounting Rexroth Hydraulic Valve

Cast Steel Material Proportional Directional Valve

Threaded Installation 4WRA6 Series Valve

Rexroth Hydraulic Valve 4WRA6 Series Proportional Directional Valve with Subplate Mounting Cast Steel Material and Threaded Installation Images