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The key difference lies in the loion 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.
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) indies 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).
What are the key technical specifiions?
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.
What are common appliions 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
What are common troubleshooting issues?
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 lubriion, 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.
What maintenance is required?
Regularly check the solenoid coils and valve spool for wear.
Maintain fluid cleanliness to prevent contamination, which is a primary cause of valve failure. Ensure the filtration system is functioning properly.
Periodically inspect electrical connections and seals.
Note: For specific technical details, ordering information, or detailed troubleshooting for your appliion, always refer to the official REXROTH technical documentation or contact a certified supplier. The information provided here is for general reference based on public sources.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Total Annual:
1 million-10 millon
Employee Number:
>50
Ecer Certification：
Verified Supplier
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha... Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha...
