1. Product Brief

2. Basic Information

• Brand: MOOG

• Model: D634-514A

• Type: Pilotless electro‑hydraulic direct‑drive servo valve (DDV)

• Mounting: ISO 4401-05 (NG10)

• Drive: Permanent magnet linear force motor; no pilot oil required

• Power Supply: 24 VDC (18–32 VDC); max 2.2 A

• Feedback: Integrated LVDT spool position closed‑loop

• Reset: Spring centering; failsafe return to neutral on power loss

• Protection: IP65

• Weight: ~6.3 kg

• Connector: M18 6‑pin + PE

3. Function & Positioning

• Core Function: Precise flow & direction control via analog signals; closed‑loop control of position/velocity/pressure/force. Delivers low hysteresis, high repeatability, and pressure‑stable response.

• Positioning: Medium-flow, high-accuracy model for general industrial closed-loop hydraulics.

4. Core Performance Parameters

Hydraulic

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

• T‑port pressure: ≤50 bar (without Y); ≤350 bar (with Y)Moog Inc.

• Rated flow (Δp = 35 bar): 75 L/min

• Peak flow: ~140 L/min

• Null leakage: 0.15–1.2 L/min

• Fluid: ISO 11158 mineral oil

• Fluid temp: −20 °C to 80 °C

• Cleanliness: ISO 4406 17/14/11

Dynamic

• Full‑stroke step response: ≤12 ms

• −3 dB bandwidth: 60–80 Hz

• Hysteresis: <0.20% FS

• Resolution: <0.10% FS

• Temp drift (ΔT=55K): <1.5% FS

Electrical

• Standard control signal: ±10 VDCMoog Inc.

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

• Spool feedback signal: 0–10 VDC

• Ambient temp: −20 °C to 60 °C

• Certification: CE compliant

5. Matching Accessories

• Shielded twisted‑pair signal cable; M18 waterproof connector

• ISO 4401-05 standard mounting manifold

• High‑precision hydraulic filter

• 24 VDC low‑ripple power supply (≥2.5 A slow fuse)

• Servo controller; displacement/pressure sensors

6. Application Fields

• Medium‑tonnage hydraulic presses

• Injection molding & die‑casting machines

• Material fatigue & vibration test benches

• General industrial closed‑loop motion control

• Hydraulic simulation & test systems