Product Overview
The MOOG D771K203A is a high-performance, two-stage electrohydraulic servo valve engineered by Moog Inc., the global benchmark in precision motion control. Operating on a proven nozzle-flapper pilot stage coupled with a robust spool-type main stage, this valve delivers infinitely variable, bidirectional flow control proportional to a low-power electrical input signal. The D771K203A is designed for closed-loop position, velocity, and force control applications where fast dynamic response, high resolution, and minimal hysteresis are mandatory. As a direct-acting interface between electronic control systems and hydraulic actuators, it serves as the critical control element in demanding industrial and aerospace-grade motion control architectures.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Hydraulic Servo Valve (Two-Stage, Nozzle-Flapper Pilot, Spool Main Stage) |
| Model Designation | MOOG D771K203A |
| Operating Pressure | Standard Industrial Grade (Up to 210 bar rated / 315 bar peak) |
| Rated Flow Capacity | Nominal 20–40 L/min at 70 bar per land (model-dependent) |
| Pilot Stage Type | Nozzle-Flapper with Integrated Feedback Torque Motor |
| Main Stage Type | Four-Way, Critical-Center Spool with Mechanical Feedback Spring |
| Input Signal | Analog Current (typically ±10 mA to ±40 mA, coil-dependent) |
| Hysteresis & Resolution | < 3% hysteresis; infinite resolution |
| Mounting & Connection | Standard ISO 4401 / Moog Subplate Interface, 4-Way Port Configuration |
| Fluid Compatibility | Mineral-Based Hydraulic Oil (ISO VG 32–68), Filtration ≤ 3 µm absolute recommended |
Engineering Features & Advantages
- Precision Performance: The nozzle-flapper pilot stage provides extremely high gain and low threshold, enabling precise micro-positioning and smooth, infinitely variable spool modulation for closed-loop servo control.
- Fast Dynamic Response: Optimized torque motor and low-inertia spool design deliver high frequency response (typically 100–200 Hz at 90° phase lag), essential for high-cycle industrial motion profiles.
- Industrial Reliability: Constructed for continuous duty with durable, corrosion-resistant materials and proven engineering for maximum system uptime.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original MOOG standards, allowing straightforward retrofit into existing hydraulic systems without rework.
Typical Industrial Applications
As a direct-acting interface between electronic control systems and hydraulic actuators, it serves as the critical control element in demanding industrial and aerospace-grade motion control architectures.
PRODUCT IMAGES
MOOG D771K203A 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.
- 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 MOOG D771K203A Servo Valve. This Germany-made high-performance hydraulic component features a two-stage design with mechanical feedback, delivering leak-free, reliable fluid control for heavy-duty industrial systems.