MOOG D634‑528A Direct‑Actin Electro‑Hydraulic Servo Valve |‑20 °C To 70 °C Operating Temperature

📌 Product Overview

The MOOG D634‑528A is a high‑performance direct‑acting (DDV) 4‑way electro‑hydraulic servo valve with integrated 24 V PWM drive electronics and built‑in LVDT spool closed‑loop position feedback. It converts analog electrical command signals into precise proportional hydraulic flow output to accurately control hydraulic actuator position, movement velocity, clamping force and system pressure for closed‑loop hydraulic systems. Adopting permanent‑magnet linear force motor direct‑drive structure, no pilot oil supply is required. Its dynamic response performance remains stable regardless of system working pressure. The internal return‑to‑center spring forces the spool back to neutral position upon power failure to avoid unexpected equipment movement. It works reliably within ambient temperature range ‑20 °C ~ +70 °C, widely used for heavy‑duty industrial high‑precision hydraulic motion‑control systems.

✨ Product Advantages (Core Features)

• ✅ Direct‑acting permanent‑magnet linear force motor, no pilot oil required, simplifies hydraulic circuit and reduces pilot‑stage leakage risk
• ✅ Built‑in LVDT spool closed‑loop feedback: ultra‑low hysteresis＜0.2 %, resolution＜0.1 %, excellent repeatability for high‑precision closed‑loop regulation
• ✅ Fail‑safe spring‑centered mechanism: spool automatically returns to neutral under power‑loss condition to protect machinery safety
• ✅ Wide ambient working temperature: ‑20 °C ~ +70 °C, stable operation under cold or high‑temperature workshop conditions
• ✅ Max working pressure up to 350 Bar (5000 PSI); IP65 protection with matched electrical connector, dust‑proof and splash‑proof for harsh workshop environment
• ✅ Standard ISO 4401‑05 (NG10) mounting interface, compatible with standard manifold blocks for easy installation and spare‑part replacement
• ✅ Integrated PWM drive electronics, supports multiple analog input signals: ±10 V, ±10 mA, 4‑20 mA
• ✅ Compatible with diverse hydraulic media: mineral hydraulic oil, phosphate ester fire‑resistant hydraulic fluid
• ✅ Robust metal valve body, strong anti‑vibration & shock‑resistant performance for continuous heavy‑load operation
• ✅ CE & EMC compliant, meets European industrial equipment standards

📋 Technical Parameters

🏭 Application Industries & Scenarios

Applicable Industries

• Hydraulic Fatigue Test Benches & Simulation Test Equipment
• Metallurgical Rolling Production Line & Roll‑gap Adjustment
• Heavy‑duty Hydraulic Press, Forging & Die‑casting Machinery
• Material Performance Test Rigs
• Off‑shore Industrial Hydraulic Equipment
• Heavy‑load Industrial Automation Hydraulic Systems