R901089245 Bosch Rexroth: Precision 4/2 Directional Control
The R901089245 (Type Code: 4WE 6 D6X/EG24N9K4) is a high-performance direct operated directional spool valve from Bosch Rexroth. It is a standard Size 6 (CETOP 3) component, essential for modern hydraulic circuits. This specific model features the Symbol D spool configuration, which denotes a 4-way, 2-position (4/2) function. Unlike 4/3 valves, the «D» spool has two distinct states (switched or unswitched/spring return) without a neutral center position, making it ideal for actuators that require binary «extend/retract» or «on/off» control logic without an intermediate stop.
Technical Specifications
- Valve Type: 4/2 Directional Spool Valve.
- Spool Symbol: D (Operated by Solenoid, Spring Return).
- Voltage: 24 VDC (Direct Current).
- Max Pressure: 350 bar (Ports P, A, B) / 210 bar (Port T).
- Max Flow: 80 l/min.
- Manual Override: N9 (Concealed with rubber cap).
- Connector: K4 (DIN EN 175301-803).
Engineer’s Field Notes
Lifecycle State: Active. Diagnosis: The Symbol D valve is solenoid actuated on one side (Side ‘a’ or ‘b’ depending on piping) and spring returned. If the actuator drifts, check the spool for internal leakage (varnish buildup). Installation Advice: Ensure the subplate surface is perfectly flat. The R901089245 uses 24V DC «High Power» solenoids; ensure your power supply can handle the inrush current. Compatibility: Fully compatible with Siemens SIMATIC S7 digital outputs. It acts as the primary pilot interface in many larger hydraulic systems or as a direct actuator control in injection molding clamping units.
| Metric | Value |
|---|---|
| Weight | 1.5 kg |
| Seal Material | NBR (Standard) |
| Fluid Temp | -30°C to +80°C |
| Mounting | ISO 4401-03-02 |
Why Symbol D?
The «D» spool is preferred for safety circuits where a known default position (spring return) is required upon power loss, ensuring the cylinder retracts or extends to a safe state automatically.
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