Product Overview
The Rexroth 4WSE2EM6-21/20B9ET315K17EV (Material Number: R900952168) is a high-response, two-stage directional servo valve engineered by Bosch Rexroth for demanding closed-loop electrohydraulic control applications. This valve operates on a nozzle-flapper pilot stage principle combined with a main spool positioned by hydraulic pressure feedback, delivering exceptionally fast dynamic response and precise flow metering proportional to the electrical input signal. As a critical control element in high-performance industrial systems, it regulates the direction and magnitude of hydraulic flow with minimal hysteresis, making it ideal for position, velocity, and force control loops in precision machinery.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Directional Servo Valve (Two-Stage, Nozzle-Flapper Pilot) |
| Model Designation | 4WSE2EM6-21/20B9ET315K17EV / R900952168 |
| Operating Pressure | Up to 315 bar (Rated), 350 bar (Peak) |
| Nominal Flow Rate | 20 L/min at Δp = 35 bar per land |
| Mounting & Connection | ISO 4401-03 (NG6) Subplate Mounting; Standard Rexroth Interface |
| Actuation | Electromagnetic Torque Motor with Mechanical Feedback |
| Electrical Interface | Analog ±10 V DC or ±20 mA Command Signal |
| Spool Type | Critical Center, Zero Overlap (Closed Center) |
Engineering Features & Advantages
- Precision Performance: The nozzle-flapper pilot stage provides extremely high resolution and low threshold response, enabling accurate flow control with minimal hysteresis and excellent repeatability for closed-loop servo applications.
- Fast Dynamic Response: Designed for high-frequency response, this valve achieves rapid spool positioning essential for high-speed position and force control loops in injection molding and testing machinery.
- Industrial Reliability: Built for continuous operation under severe industrial conditions with robust construction, contamination-resistant pilot stage, and proven Rexroth manufacturing quality.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM Rexroth 4WSE2 series servo valves, ensuring drop-in replacement without system modification.
- Stable Operation: Hydraulic position feedback of the main spool ensures stable, load-independent performance across the full pressure and flow range.
Typical Industrial Applications
This Rexroth servo valve is widely deployed in high-precision industrial scenarios including plastic injection molding machines requiring accurate injection velocity and pressure profiling, metallurgical presses for precise force and position control, CNC machine tools and testing systems demanding high-bandwidth motion control, and general closed-loop hydraulic systems in aerospace and marine applications where fast, accurate directional flow control is critical.
PRODUCT IMAGES
Rexroth 4WSE2EM6-21/20B9ET315K17EV / R900952168 Directional Servo Valve
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- 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.
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- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine REXROTH 4WSE2EM6-21/20B9ET315K17EV / R900952168 Proportional Directional Valve. This Germany-made 24V DC hydraulic component features a 4-way, 3-position design with integrated electronics, delivering leak-free, reliable fluid control for heavy-duty industrial systems.