Original Moog G631 Series Hydraulic Servo Valve
Description:
The Original Moog G631 Series Hydraulic Servo Valve is a high-performance, two-stage electrohydraulic flow-control servo valve designed for demanding motion-control applications. Its mechanical feedback design, low-friction double-nozzle pilot stage, and rugged spool-and-bushing construction provide accurate and responsive hydraulic control. The G631/631 Series is suitable for controlling actuator position, velocity, pressure, and force in industrial hydraulic systems.
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Original Moog G631 Series Hydraulic Servo Valve
| Item | Specification |
|---|---|
| Product Name | Original Moog G631 Series Hydraulic Servo Valve |
| Brand | Moog |
| Series | G631 / 631 Series |
| Valve Type | Two-Stage Electrohydraulic Flow Control Servo Valve |
| Feedback Type | Mechanical Feedback (MFB) |
| Pilot Stage | Symmetrical Double-Nozzle and Flapper |
| Torque Motor | Double Air-Gap, Dry Torque Motor |
| Output Stage | Closed-Center, Four-Way Sliding Spool |
| Mounting Pattern | ISO 4401-05-05-0-94 |
| Standard Rated Flow | 5, 10, 20, 40, 60, 75 L/min |
| Rated Flow Range | Approx. 3.8–78 L/min depending on configuration |
| Maximum Operating Pressure | Up to 350 bar / 5,000 psi depending on configuration |
| Standard Pressure Rating | Up to 315 bar / 4,500 psi |
| Step Response | Approx. 18 ms for 0–100% stroke |
| Frequency Response | Up to 75 Hz |
| Rated Signal | 30–150 mA |
| Standard Signal | 30 mA / 100 mA |
| Weight | Approx. 2.2 kg / 4.9 lb |
| Installation Position | Any orientation |
| Hydraulic Fluid | Hydraulic oil according to DIN 51524 Parts 1–3 and ISO 11158 |
| Recommended Viscosity | 10–85 mm²/s (cSt) |
| Seal Material | FKM, 85 Shore A; other options available |
| Temperature Range | Ambient: -40 to +135°C; fluid: according to specified configuration |
| Applications | Industrial machinery, metal forming, presses, plastics machinery, oil & gas, testing systems |
| Key Features | High response, precise flow control, low hysteresis, rugged construction, long service life |