General Description

Basic Data

• Brand: MOOG

• Model: D634-534

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

• Mounting: ISO 4401‑05 (NG10)

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

• 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 return

• Protection: IP65

• Weight: Approx 6.8 kg

• Connector: M18 6‑pin + PEMoog Inc.

Hydraulic Specifications

• Max working pressure (P, A, B): 350 barMoog Inc.

• Max T‑port pressure: ≤50 bar (350 bar possible with Y port)Moog Inc.

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

• Peak flow: ≈185 L/minMoog Inc.

• Null leakage: 0.8–4.0 L/min

• Fluid: ISO 11158 mineral oil

• Fluid temperature: −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 scaleMoog Inc.

• 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 temperature: −20 °C to +60 °C

• Certification: CE compliant

Key Features

• ✅ Pilotless design – no pilot oil required, higher reliability

• ✅ LVDT closed‑loop – accurate, repeatable positioningMoog Inc.

• ✅ Pressure‑independent dynamics – stable response under varying loads

• ✅ Energy‑saving 24 VDC PWM – low power consumptionMoog Inc.

• ✅ Spring fail‑safe – returns to neutral on power loss

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