D635-671E | MOOG | High-performance Servo Valve

Description

MOOG D635-671E Electrohydraulic Servo Valve

As an authorized distributor for Moog industrial components, Saulcontrol provides precision motion control solutions with expert technical support. All products include our 1-year comprehensive warranty and global shipping for reliable performance in critical applications.

Technical Specifications

Main Features and Advantages

The D635-671E delivers exceptional precision control through Moog’s proven jet pipe technology, providing superior contamination resistance compared to traditional nozzle-flapper designs. Its symmetrical spool configuration ensures consistent bidirectional performance with minimal null leakage. Integrated LVDT position feedback enables real-time monitoring and diagnostics for predictive maintenance.

D635-671E

Rugged aerospace-grade construction withstands high shock and vibration environments while maintaining stable flow gain characteristics throughout its operating range. Industry-leading response times under 15ms guarantee precise motion control for dynamic positioning tasks. The valve’s wide temperature tolerance allows reliable performance in extreme environments from arctic conditions to steel mill heat zones.

Application Areas

Test and Simulation: The D635-671E powers hydraulic actuators in aircraft structural test rigs, accurately replicating flight loads during fatigue testing. Automotive proving grounds utilize its precision control for suspension durability simulators that accurately reproduce road conditions.

Industrial Machinery: Steel rolling mills employ this valve for precise gauge control in finishing stands where micron-level thickness tolerances are critical. Plastic injection molding machines benefit from its rapid response for controlled mold clamping velocities. In heavy machinery, it enables vibration isolation platforms for semiconductor manufacturing equipment.

Related Products

D631-XXXX series – Compact valves for space-restricted applications
D661-XXXX series – Industrial-grade servo valves
D680-XXXX series – High-pressure models rated to 350 bar
D633-R04K01M0NSM2 – Spare solenoid coil for maintenance
G631-3004 – Servo amplifier optimized for D6-series valves
J760-001 – Test adapter kit for field diagnostics
D665 – Next-generation valve with enhanced connectivity

Installation and Maintenance

Installation Preparation: Before installing the D635-671E, verify hydraulic fluid cleanliness meets ISO 4406 16/14 class. Use Moog-recommended port-sealing techniques to prevent case distortion affecting precision. Ensure proper electrical grounding and shielded twisted-pair wiring for control signals. When installing with G631-3004 amplifiers, pre-calibrate null settings during commissioning.

Maintenance Suggestion: Monitor internal filter pressure differential; replace when ΔP exceeds 30 bar. Perform quarterly stroke tests to detect spool sticking early. Maintain spare kits including D633-R04K01M0NSM2 coils and seal sets. For critical systems, implement Moog’s Valve Health Monitoring system (VHMS) software. Record valve current draw trends as early indicators of wear.

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