MOOG G631‑3004B Two‑Stage Electro‑Hydraulic Servo Valve

📌 Product Overview

The MOOG G631‑3004B is a high‑performance two‑stage nozzle‑flapper electro‑hydraulic servo valve with mechanical spring feedback. It converts analog electrical command signals into precise proportional hydraulic flow output. It accurately controls the position, velocity and force of hydraulic actuators in closed‑loop hydraulic systems. The first‑stage torque motor drives nozzle‑flapper pilot assembly to generate differential pressure, then controls the second‑stage main spool. Mechanical feedback spring connects spool and flapper to achieve closed‑loop flow regulation. Widely adopted for high‑precision industrial hydraulic motion control and test equipment.

✨ Product Advantages (Core Features)

• ✅ Two‑stage nozzle‑flapper pilot design, mechanical spring feedback, outstanding dynamic response & stable control performance
• ✅ Ultra‑low hysteresis ≤0.2 %, high resolution＜0.1 %, excellent repeatability for precision closed‑loop control
• ✅ Standard ISO 4401‑05 (NG10) mounting interface, easy manifold installation and direct replacement
• ✅ Field‑replaceable first‑stage filter disc, convenient on‑site maintenance and reduces downtime
• ✅ Optional 5th pilot port for independent pilot oil supply, flexible system configuration
• ✅ Rugged metal valve body, anti‑vibration structure, long service life under continuous heavy‑load operation
• ✅ Compatible with multiple hydraulic media: mineral‑based hydraulic oil, phosphate ester fire‑resistant fluid, water‑glycol fluid
• ✅ IP65 protection rating with matched electrical connector, adapts to harsh industrial workshop environment

📋 Technical Parameters

🏭 Application Industries & Scenarios

• Hydraulic Fatigue Test Benches & Simulation Test Equipment
• Metallurgical Rolling Production Line
• Material Forming & Heavy‑duty Hydraulic Press
• Aerospace Component Test Rigs
• Die‑casting & Forging Machinery
• Off‑shore & Marine Hydraulic Equipment
• High‑precision Industrial Automation Hydraulic Systems