MOOG G631-3003 Electro-hydraulic Flow Servo Valve

Product Description

MOOG G631-3003 is a two-stage nozzle-flapper electro-hydraulic flow servo valve of the G631 series. It adopts dry torque motor, double nozzle pilot stage and spool mechanical feedback structure, without integrated drive electronics. The output flow is proportional to the analog current input signal. It features high resolution, low hysteresis, fast step response and excellent stability. It serves as the core precision component for closed-loop electro-hydraulic control of position, speed, pressure and force, widely used in high-end industrial hydraulic servo systems.

Technical Specifications

• Model: G631-3003 (G631-3003B)
• Brand: MOOG (USA)
• Series: G631 two-stage flow control servo valve
• Rated Flow: 19 L/min (5 gpm, at 7MPa pressure drop across valve)
• Rated Input Current: 100mA
• Max Operating Pressure: 310 bar (4500 psi)
• 100% Step Response: ≤18 ms
• Frequency Response: 75 Hz
• Mounting Standard: ISO 4401-05-05-0-94 (Size 05)
• Weight: 2.2 kg
• Construction: Two-stage, 4-way, closed center, nozzle-flapper pilot stage, mechanical feedback
• Hysteresis: ≤3%
• Resolution: ≤0.5%
• Fluid: Anti-wear hydraulic oil, phosphate ester fluid (optional)
• Operating Oil Temperature: -20℃ ~ +80℃
• Sealing: Metal body seal, sealed coil assembly
• Certifications: CE

Application

1. Material testing machines, fatigue test benches, hydraulic shakers
2. Hydraulic AGC, bending roll and shifting roll servo control for metallurgical rolling mills
3. Wind turbine pitch servo, hydraulic actuator for hydro turbine governors
4. Motion simulation platforms, flight simulator hydraulic drive units
5. Military equipment, precision injection molding and die-casting closed-loop hydraulic control
6. Steam turbine bypass, electro-hydraulic governor and actuator retrofitting spare parts for power plants

Series Models

G631-3002, G631-3003, G631-3004, G631-3005, G631-3006, G631-3023