MOOG G631-3005B Servo Valve
Core Specifications
Hydraulic Parameters
| Parameters |
Indicators |
Description |
| Model |
G631-3004B |
Complete Model: G631-3004B |
| Type |
Two-stage servo valve |
Dual-nozzle baffle pilot + spool power stage, Mechanical Feedback (MFB) |
| Maximum Working Pressure |
315 bar (31.5 MPa) |
P/A/B port; T port ≤315 bar |
| Rated Flow Rate |
20 L/min |
@35 bar Valve Pressure Drop (single valve port) |
| Maximum Flow Rate |
Approx. 75 L/min |
Depending on valve core specification |
| Step Response |
≤12–15 ms |
100% signal, at 210 bar |
| Frequency Response |
75–120 Hz |
±100% input signal |
| Control Accuracy |
Hysteresis ≤0.2%, Resolution < 0.1%, Repeatability < 0.3% |
High precision control parameters |
Working Medium: Petroleum-based hydraulic oil (DIN 51524), water-glycol, phosphate ester
Oil Viscosity: Recommended 10–85 mm²/s; Permissible 5–1250 mm²/s
Cleanliness: ISO 4406 <17/14/11 (long life); <19/16/13 (functional safety)
Electrical Parameters
| Parameters |
Indicators |
Description |
| Control Signal |
±30 mA / ±100 mA (standard) |
Optional ±15 mA / ±50 mA |
| Coil Resistance |
Approx. 80 Ω |
Single coil |
| Protection Rating |
IP65 |
With matching plug |
| Ambient Temperature |
-40°C ~ +135°C |
Oil: -20°C ~ +80°C |
| Vibration |
30g |
Triaxial |
Mechanical and Installation
| Parameters |
Indicators |
Description |
| Installation Standard |
ISO 4401 |
Dimension 05 (CETOP 05) |
| Installation Method |
Flange Fixed |
Any Installation Position |
| Valve Body Material |
Aluminum Alloy / Stainless Steel |
Durable construction materials |
| Sealing |
Nitrile Rubber (NBR) |
Fluororubber (FKM) Optional |
| Weight |
2.2 kg |
Compact and lightweight design |
Supply and Warranty
- Delivery Time: Regularly 8–12 weeks, some in stock
- Warranty: 12 months from the manufacturer
- Origin: USA
Core Advantages
- Dual Nozzle Baffle + Mechanical Feedback: Extremely high control accuracy, minimal hysteresis, and extremely fast response, suitable for precision closed-loop control
- Robust and Durable: Hardened valve core and sleeve, dry torque motor, resistant to contamination and long service life
- Flexible Configuration: Supports independent pilot control from the fifth port (X port), adaptable to complex systems
- Easy Maintenance: Pilot stage filter disc can be replaced on-site, reducing downtime
- Wide Operating Condition Adaptability: High pressure, wide temperature, and wide viscosity range, meeting harsh industrial environments
Typical Applications
- Precision Testing Equipment: Material testing machines, servo testing benches
- Plastics Machinery: Precision control of injection molding machines and extruders
- Metallurgical Equipment: Servo systems for rolling mills and continuous casting machines
- Industrial Automation: Pressure/position/force closed-loop control systems
- Aerospace: Ground testing equipment, hydraulic simulation systems