Description
This string represents a full model and configuration code for a Moog 631 Series Mechanical Feedback (MFB) Electrohydraulic Servo Valve.
Technical Breakdown
| Feature | Specification Details |
| Valve Series | 631 Series (2-stage flow control servo valve with mechanical feedback) |
| Mounting Pattern | Size 05 (ISO 4401-05-05-0-94) |
| Rated Flow (\mathbf{H10}) | 10 l/min (2.6 gpm) at a 35 bar (500 psi) valve drop per spool land |
| Pilot Stage (\mathbf{JO}) | Standard response, nozzle-flapper pilot stage with mechanical feedback |
| Pressure Rating (\mathbf{FM}) | Standard high-pressure configuration (typically up to 210 to 315 bar / 3,000 to 4,500 psi) |
| Electrical Interface (\mathbf{5}) | Specific coil resistance / rated control signal variant (typically dual-coil configuration) |
| Seals & Fluid Compatibility (\mathbf{V}) | Fluorocarbon (FKM / Viton) seals, ideal for mineral and synthetic hydraulic oils |
| Options (\mathbf{Q}) | Special factory or auxiliary options specifier |
General Performance Data
- Step Response: \approx 18 ms (for 0 to 100% stroke)
- Frequency Response: ~75 Hz at 90° phase lag
- Internal Leakage: Low-friction double-nozzle design ensuring high resolution and low hysteresis (<3\% of rated signal)
- Weight: 2.2 kg (4.9 lbs)
