Product Overview
The MOOG G631-3005B / H04FOFM4VBR is a high-performance, two-stage electrohydraulic servo valve engineered by MOOG, the global benchmark in precision motion control. Operating on a torque-motor driven, flapper-nozzle pilot stage with a spool-type power stage, this valve converts low-power electrical command signals into highly accurate hydraulic flow and pressure outputs. The G631 series is designed for closed-loop position, velocity, and force control in demanding industrial and aerospace-grade motion systems, delivering exceptional dynamic response, minimal hysteresis, and long-term null stability. The H04FOFM4VBR configuration designates the specific spool, flow rating, and porting arrangement, making it a direct-fit solution for OEM servo axes requiring precise, repeatable metering.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Electrohydraulic Servo Valve (Two-Stage, Flapper-Nozzle Pilot) |
| Model Designation | G631-3005B / H04FOFM4VBR |
| Manufacturer | MOOG Inc. |
| Operating Pressure | Standard Industrial Grade (Up to 210 bar rated / 315 bar peak) |
| Rated Flow | Nominal 5–40 L/min (configuration dependent per H04 spool code) |
| Pilot Stage | Torque motor with dual nozzle-flapper assembly |
| Power Stage | Four-way, closed-center sliding spool |
| Mounting & Connection | Standard ISO 4401 / MOOG subplate interface, 4-way porting |
| Electrical Interface | Differential current command, standard MOOG valve connector |
| Hysteresis / Null Shift | < 3% (typical), factory-set null |
Engineering Features & Advantages
- Precision Performance: The flapper-nozzle pilot stage provides extremely high resolution and low threshold, enabling accurate micro-metering of flow for closed-loop servo control with minimal deadband.
- Fast Dynamic Response: High torque-motor force output and optimized spool dynamics deliver rapid step response and wide frequency bandwidth, essential for high-cycle motion axes.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with hardened spool and sleeve assemblies resisting contamination-induced wear.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original MOOG standards, allowing straightforward retrofit into existing hydraulic systems without rework.
Typical Industrial Applications
The G631 series is designed for closed-loop position, velocity, and force control in demanding industrial and aerospace-grade motion systems, delivering exceptional dynamic response, minimal hysteresis, and long-term null stability.
PRODUCT IMAGES
MOOG G631-3005B / H04FOFM4VBR 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 G631-3005B / H04FOFM4VBR Servo Valve. This USA-made high-performance hydraulic component features a two-stage design with mechanical feedback, delivering leak-free, reliable fluid control for heavy-duty industrial systems.