1. General Description

2. Model Code (D634‑361C)

• D634: Series = Direct drive servo valve, ISO 4401 Size 05 (NG10)

• 361: Configuration = ultra‑high‑dynamic spool, 24 VDC, max bandwidth in D634

• C: Revision C (current production baseline)

3. Hydraulic Specifications

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

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

• T‑port Pressure (no Y port): 50 bar (725 psi)Moog Inc.

• T‑port Pressure (with Y port): 350 bar (5,000 psi)Moog Inc.

• Rated Flow (Δp = 35 bar/orifice): 120 L/min (31.7 gpm)

• Max Flow: ≈180 L/min

• Internal Leakage: ≤2.8 L/min

• Fluid: Mineral oil (ISO 11158 / DIN 51524)

• Fluid Temp: −20 °C to +80 °C

• Fluid Cleanliness: ISO 4406 17/14/11Moog Inc.

• Weight: ≈7.0 kg

4. Dynamic Performance (Key Advantage)

• Full‑stroke Step Response: ≤18 ms (fastest in D634)Moog Inc.

• −3 dB Bandwidth: 65–75 Hz (highest in D634)

• Hysteresis: <0.2% full scaleMoog Inc.

• Resolution: <0.1% full scaleMoog Inc.

• Null Drift (ΔT = 55 K): <1.2% full scale

5. Electrical Specifications

• Supply Voltage: 24 VDC (18–32 VDC)Moog Inc.

• Max Operating Current: 2.8 A

• Standard Command Signal: ±10 VMoog Inc.

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

• Spool Position Feedback: 0–10 VDC (or 4–20 mA)

• Connector: M18, 6 pins + PE, IP65Moog Inc.

• Ambient Temp: −20 °C to +60 °C

• EMC: CE compliant

6. Key Features

• Pilotless direct drive: No external pilot supply, simpler installationMoog Inc.

• Ultra‑high bandwidth (65–75 Hz): For fastest closed‑loop systems

• Pressure‑independent dynamics: Stable under varying loadsMoog Inc.

• Low leakage & high resolution: Precision control for test standsMoog Inc.

• Fail‑safe spring return: Protects machinery on power lossMoog Inc.

• Integrated PWM electronics: Compact, IP65 protection

7. Typical Applications

• High‑speed structural fatigue test rigs (aerospace/automotive)

• Dynamic vibration simulation tables

• High‑speed hydraulic presses & injection molding machines

• Closed‑loop position/velocity control for high‑response machinery

8. Pin Assignment (6+PE)

1. +24 VDC

2. Power Ground

3. Command +

4. Command –

5. Position Feedback Out

6. Feedback Ground

   PE: Protective Earth

   Use shielded twisted pair for all signal wires.