Product Overview
The Rexroth 4WS2EM10-51/30B11ET315K31EV (Material Number: R900949285) is a high-response, two-stage servo directional valve engineered for precise electro-hydraulic control of position, velocity, force, and pressure in demanding industrial motion systems. Manufactured by Bosch Rexroth, this valve utilizes a torque-motor-driven pilot stage with a mechanical feedback mechanism to position the main spool proportionally to the electrical command signal. The 4WS2EM series is a proven platform for closed-loop control architectures, delivering exceptional dynamic response, minimal hysteresis, and high resolution metering characteristics. With a nominal size of NG10 (Size 10) and a rated flow capacity of 30 L/min at a 31.5 bar (315 bar rated system pressure) pressure drop, this servo valve is purpose-built for applications requiring fast, accurate, and repeatable hydraulic actuation.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Servo Directional Valve (Two-Stage, Electro-Hydraulic) |
| Model Designation | 4WS2EM10-51/30B11ET315K31EV |
| Material Number | R900949285 |
| Nominal Size | NG10 (Size 10) |
| Rated Flow | 30 L/min (at Δp = 31.5 bar per land) |
| Operating Pressure | Up to 315 bar (rated system pressure) |
| Pilot Stage | Torque motor with mechanical feedback (nozzle-flapper principle) |
| Spool Type | Critical center, closed-loop main spool |
| Electrical Interface | Proportional solenoid / torque motor, ±10 V DC or ±10 mA command signal |
| Mounting & Connection | ISO 4401-05 / CETOP 5 subplate mounting, 4-way |
| Hydraulic Fluid | Mineral oil based hydraulic fluid (ISO VG 32–68), cleanliness class ISO 4406 18/16/13 or better |
Engineering Features & Advantages
- Precision Performance: The servo directional valve (two-stage, electro-hydraulic) delivers precise, repeatable performance with low hysteresis and stable control across the full working range.
- Industrial Reliability: Designed for dependable long-term operation in demanding industrial environments, with quality bearings and sealing systems ensuring extended maintenance intervals.
- Direct Fit Replacement: Precision-manufactured to original REXROTH specifications for direct replacement, minimising downtime and eliminating fitment issues.
- Rated Capability: Rated for pressure ratings up to 315 bar and flow rates up to 30 L/min, supporting stable operation across the full working range.
Typical Industrial Applications
With a nominal size of NG10 (Size 10) and a rated flow capacity of 30 L/min at a 31.5 bar (315 bar rated system pressure) pressure drop, this servo valve is purpose-built for applications requiring fast, accurate, and repeatable hydraulic actuation.
PRODUCT IMAGES
REXROTH 4WS2EM10-51/30B11ET315K31EV / R900949285 Servo Directional Valve
⚡ Emergency Plant Maintenance & Ready-to-Ship Notice:
- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine REXROTH 4WS2EM10-51/30B11ET315K31EV / R900949285 High-Response Directional Control Valve. This Germany-made 315V hydraulic component features a high-response pilot-operated design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.
