Product Overview
The MOOG G631-3004B / H40JOFM4VBR is a high-performance, two-stage electrohydraulic servo valve engineered by Moog Inc., the global benchmark in precision motion control. This valve operates on a torque-motor, flapper-nozzle pilot stage that hydraulically positions a precision-ground spool within the second stage, delivering infinitely variable flow control proportional to the electrical input signal. Designed for closed-loop servo systems, the G631 series provides exceptional dynamic response, minimal hysteresis, and high resolution, making it the definitive choice for applications demanding micron-level position, velocity, or force control. The H40JOFM4VBR designation defines the specific spool configuration, rated flow, and mechanical interface of this factory-configured unit, ensuring direct integration into Moog-standard manifolds and OEM control blocks.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Electrohydraulic Servo Valve (Two-Stage, Flapper-Nozzle Pilot) |
| Model Designation | G631-3004B / H40JOFM4VBR |
| Manufacturer | Moog Inc. |
| Operating Pressure | Standard Industrial Grade (Up to 210 bar rated, 315 bar peak) |
| Rated Flow | Per H40 spool code (nominal 40 L/min at 70 bar valve drop) |
| Pilot Stage | Torque motor with dual nozzle-flapper assembly |
| Spool Configuration | Four-way, closed-center, critical lapped spool & sleeve |
| Mounting & Connection | Standard Moog ISO interface, subplate or manifold mounting |
| Electrical Interface | Standard Moog valve connector, differential current input |
Engineering Features & Advantages
- Precision Performance: The torque-motor flapper-nozzle pilot stage delivers extremely high resolution and low threshold, enabling accurate metering of flow with minimal hysteresis (<3%) and excellent linearity across the full command range.
- High Dynamic Response: Optimized pilot stage and low-inertia spool design provide fast step response and wide frequency bandwidth, essential for high-gain closed-loop position and force control systems.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with hardened critical lapped spool and sleeve for long service life and consistent performance in high-cycle applications.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM Moog G631 series specifications, ensuring drop-in replacement without manifold or control loop modification.
- Direct Fit Replacement: Precision-manufactured to original MOOG specifications for direct replacement, minimising downtime and eliminating fitment issues.
Typical Industrial Applications
Designed for closed-loop servo systems, the G631 series provides exceptional dynamic response, minimal hysteresis, and high resolution, making it the definitive choice for applications demanding micron-level position, velocity, or force control.
PRODUCT IMAGES
MOOG G631-3004B / H40JOFM4VBR 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 G631-3004B / H40JOFM4VBR 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.