German Rexroth Hydraulic Valve with Proportional Control for Hydraulic Systems Compatible with Mineral Oil and Phosphate Ester
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| Attribute | Value |
|---|---|
| Processing & Customization | Yes |
| Type | Proportional valve |
| Material | Cast steel |
| Brand | REXROTH |
| Scope of Application | Hydraulic system |
| Product Alias | Proportional directional valve |
| Applicable Medium | Oil products |
| Applicable Temperature | Normal temperature (℃) |
| Nominal Pressure | Normal pressure (MPa) |
| Nominal Diameter | 6-way diameter (mm) |
| Installation type | Threaded installation |
| Operating Temperature | Room temperature |
| Type (channel location) | Straight through type |
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The REXROTH 4WRA6 is a direct-operated, proportional directional valve without electrical position feedback or integrated electronics (OBE). It controls the direction and volume of hydraulic fluid flow and is designed for subplate mounting per ISO 4401 standards. Its maximum operating pressure is 315 bar, with flow rates up to 75 L/min (depending on model).
- Direct-operated design for precise flow control without external feedback
- Proportional solenoid control with detachable coils and centering thread for easy maintenance
- Spring-centered spool that returns to neutral when de-energized
- Compatiblity with external electronics (e.g., Eurocard amplifiers) for signal control
- Compact sizes: NG6 and NG10
When an electrical signal is sent to the proportional solenoid, it generates a force that moves the spool proportionally. This adjusts the opening of flow paths between ports P (pressure), A/B (actuator lines), and T (tank), enabling continuous control of flow direction and volume. The spool returns to center via springs when de-energized.
This valve suits applications requiring precise hydraulic control, such as:
- Industrial machinery (e.g., presses, plastic injection molding)
- Mobile equipment (e.g., cranes, excavators)
- Systems needing directional and flow control without integrated electronics
Model codes indicate specifications (e.g., 4WRA6E07-2X/G24N9K4/V):
- 4WRA6: Series and size (NG6)
- E07: Spool type and control configuration
- G24N9K4: 24V DC supply, corrosion-resistant coating
Consult REXROTH datasheets or suppliers for exact requirements like flow rate, spool type, and electrical inputs.
- Use the specified subplate (ISO 4401) to avoid leakage
- Ensure the tank line is never unloaded; a pre-load valve (~2 bar) may be required
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