Original Imported Moog Servo Valve with Single Cylinder Keyed or Splined Shaft and Free Maintenance

D634-341C D664-4380K
075F130C 078F130C
D062-512e 0514-950001
D661-4341C D633-460B
0514701443 0062-191C MOOG servo valve electro-hydraulic, made in Germany, imported with original packaging

FAQ:

How to maintain servo valves?

• Oil quality management: Use recommended fluids (e.g., phosphate ester fire-resistant oil) and maintain cleanliness per NAS 1638 Class 5 standards. Regularly check acidity and resistivity .

• Routine inspections: Test for electrical issues (e.g., coil resistance), clean filters, and check for loose components .

• Pre-startup checks: Ensure oil circulation before powering the valve to prevent clogging .

5. How to troubleshoot unstable operation (e.g., cylinder drift or oscillation)?

• Check servo valve resolution and zero zone stability .

• Inspect for internal leakage or spool wear .

• Verify control system parameters and calibrate zero bias if needed .

6. What if the valve doesn’t move?

• Confirm electrical signals and coil connectivity .

• Check for spool sticking caused by debris in oil .

• Ensure correct startup sequence: oil flow before electrical power .

7. Can Moog servo valves be customized?

Yes. Models like the D636/D637 series support fieldbus interfaces and programmable electronics for application-specific tuning .

8. What specifications should I consider?

• Operating pressure: Up to 350 bar .

• Flow rate: 5–100 L/min (at Δp 35 bar) .

• Voltage/current: Typically 220V, 1.5A .

• Mounting: Complies with ISO 4401 standards .

9. How to ensure long-term reliability?

• Use high-quality filters and maintain oil cleanliness .

• Avoid prolonged operation beyond rated temperatures .

• Schedule periodic professional servicing .

10. Where are Moog servo valves used?

Applications include aviation, aerospace, steel mills, power generation, and industrial automation .

For specific model details (e.g., G761-3004B or D661 series), refer to technical datasheets or contact authorized suppliers .

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This FAQ is based on general product information and common industry practices. Always consult official Moog documentation for valve-specific guidelines.

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