MOOG D631-3006B Servo Valve
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Advantages of the MOOG D631-3006B Servo Valve
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High Dynamic Response: Fast, accurate control suitable for high-frequency hydraulic systems.
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Exceptional Repeatability: Very low hysteresis ensures consistent performance and precise command tracking.
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Robust Construction: Engineered with high-strength materials for long service life in demanding operating environments.
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Low Internal Leakage: Optimized spool and sleeve design ensures efficient hydraulic performance.
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Wide Application Compatibility: Ideal for servo hydraulic systems across aerospace, plastics machinery, testing platforms, and industrial automation.
| Parameter | Specification |
|---|---|
| Valve Type / Series | Direct-operated, 2-stage servo valve (631 / D631 series) |
| Mounting Pattern | ISO 4401, Size 05 (ISO 4401-05-05-0-94) |
| Pilot Stage | Nozzle / flapper; standard (or high-response variant) |
| Rated Flow (per land) | 2 / 4 / 8 / 16 / 24 / 30 L/min at Δp = 5 bar |
| Maximum Operating Pressure (P, A, B) | Up to 350 bar (depending on model) |
| Step Response (0–100%) | ~25 ms for standard model, ~13 ms for high-response version |
| Threshold (deadband) | < 1% (command signal) |
| Hysteresis (without dither) | < 5% for standard; < 3% for high-response model |
| Null Shift (ΔT = 55 K) | < 5% (standard), < 4% (high-response) |
| Frequency Response / Bandwidth | ~ 75 Hz (for 631-series typical) |
| Rated Signal / Electrical Input | 30 to 150 mA (standard for 631 series) |
| Weight | ~ 2.2 kg for 631-series valve body |
| Hydraulic Ports | Standard P, A, B, T ports (ISO mounting) |
| Seal / Materials | Seals suitable for typical hydraulic fluids; robust valve body |
| Filter | Field-replaceable first-stage disc filter for pilot stage |