Product Overview
The MOOG G631-3006B / H19JOFM4VBR 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, bidirectional flow control proportional to the electrical input command. Designed for closed-loop position, velocity, and force control architectures, the G631 series valve provides exceptional dynamic response, minimal hysteresis, and high resolution metering, making it a critical control element in demanding industrial and aerospace-grade hydraulic systems. The H19JOFM4VBR designation defines the specific spool configuration, rated flow, and electrical interface of this factory-configured unit.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Two-Stage Electrohydraulic Servo Valve (Flapper-Nozzle Pilot, Spool Second Stage) |
| Model Designation | G631-3006B / H19JOFM4VBR |
| Manufacturer | Moog Inc. |
| Operating Pressure | Standard Industrial Grade (Up to 210 bar rated supply pressure) |
| Rated Flow | Nominal 5–40 L/min at 70 bar valve pressure drop (per spool configuration) |
| Pilot Stage | Torque motor with dual nozzle-flapper assembly |
| Input Signal | Analog current command (typically ±10 mA to ±40 mA coil rating) |
| Mounting & Connection | Standard ISO 4401 / Moog subplate interface with 4-way porting |
| Hysteresis | < 3% of rated current (typical) |
| Threshold | < 1% of rated current (typical) |
Engineering Features & Advantages
- Precision Performance: The torque-motor flapper-nozzle pilot stage delivers extremely high resolution and low threshold, enabling accurate micro-positioning and smooth velocity control in closed-loop servo systems.
- High Dynamic Response: Optimized magnetic circuit and low-inertia spool design provide fast step response and high frequency bandwidth, essential for high-cycle industrial motion profiles.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with robust construction and wear-resistant internal components for extended service life.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original MOOG OEM standards, ensuring drop-in replacement without modification to existing manifolds or piping.
Typical Industrial Applications
Designed for closed-loop position, velocity, and force control architectures, the G631 series valve provides exceptional dynamic response, minimal hysteresis, and high resolution metering, making it a critical control element in demanding industrial and aerospace-grade hydraulic systems.
PRODUCT IMAGES
MOOG G631-3006B / H19JOFM4VBR Servo Valve
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Shop the genuine MOOG G631-3006B / H19JOFM4VBR Servo Valve. This Germany-made 24V DC hydraulic component features a two-stage design with mechanical feedback, delivering leak-free, reliable fluid control for heavy-duty industrial systems.