• Brand: MOOG

• Model: D634-536A

• Type: Pilotless electro‑hydraulic direct‑drive servo valve

• Mounting: ISO 4401‑05 (NG10)Moog Inc.

• Drive: Permanent‑magnet linear force motor (no pilot oil)Moog Inc.

• Power Supply: 24 VDC (18–32 VDC), max 2.2 AMoog Inc.

• Feedback: Integrated LVDT closed‑loop position sensing

• Centering: Spring‑centered, fail‑safe neutral returnMoog Inc.

• Protection: IP65

• Weight: Approx 6.8 kg

• Connector: M18 6‑pin + PEMoog Inc.

Hydraulic Specifications

• Max Working Pressure (P, A, B): 350 bar (5,000 psi)Moog Inc.

• Max T‑Port Pressure: ≤50 bar; 350 bar possible with Y portMoog Inc.

• Rated Flow (Δp = 35 bar per land): 100 L/min

• Peak Flow: ≈185 L/min

• Null Leakage: 0.8–4.0 L/min

• Fluid: ISO 11158 mineral oil

• Fluid Temp: −20 °C to +80 °C

• Cleanliness: ISO 4406 17/14/11

Dynamic Performance (Typical)

• Full‑Stroke Step Response: ≤20 msMoog Inc.

• −3 dB Bandwidth: 40–60 Hz

• Hysteresis: <0.25% full scale

• Resolution: <0.10% full scale

• Temperature Drift: <1.5% full scale

Electrical Interface

• Standard Control Signal: ±10 VDCMoog Inc.

• Optional Signals: ±10 mA, 4–20 mAMoog Inc.

• Feedback Signal: 0–10 VDC

• Ambient Temp: −20 °C to +60 °C

• Certification: CE compliant

Key Features

• ✅ Pilotless Design – no pilot oil, higher reliabilityMoog Inc.

• ✅ LVDT Closed‑Loop – precise, repeatable positioning

• ✅ Pressure‑Independent Dynamics – stable under varying loadsMoog Inc.

• ✅ Energy‑Saving 24 VDC PWM – low power draw

• ✅ Spring Fail‑Safe – returns to neutral on power lossMoog Inc.

Applications

• Hydraulic presses & forging machines

• Injection molding & die‑casting equipment

• Vibration & fatigue test benches

• Heavy‑duty industrial hydraulic systems

• Precision closed‑loop control of position, speed, pressure