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D634-362C

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D634-362C
May 25, 2026

D634-362C

The D634‑362C is a single‑stage, pilotless direct drive servo valve (DDV) in the MOOG D634 family, with ISO 4401 Size 05 (NG10) mounting. It uses a permanent magnet linear force motor to drive the spool directly — no pilot oil required. An internal LVDT provides closed‑loop spool position feedback for outstanding linearity and repeatability. Compared to 361C: similar ultra‑high bandwidth, even lower internal leakage, optimized for precision & fatigue testing. Dynamic response is pressure‑independent; spring centering ensures fail‑safe return to neutral on power loss.

Description

1. General Description

The D634‑362C is a single‑stage, pilotless direct drive servo valve (DDV) in the MOOG D634 family, with ISO 4401 Size 05 (NG10) mountingMoog Inc.. It uses a permanent magnet linear force motor to drive the spool directly — no pilot oil requiredMoog Inc.. An internal LVDT provides closed‑loop spool position feedback for outstanding linearity and repeatability.
Compared to 361C: similar ultra‑high bandwidth, even lower internal leakage, optimized for precision & fatigue testingMoog Inc.. Dynamic response is pressure‑independent; spring centering ensures fail‑safe return to neutral on power lossMoog Inc..

2. Model Code (D634‑362C)

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

  • 362: Configuration = ultra‑high‑dynamic, low‑leakage spool, 24 VDC, precision‑tuned

  • 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)Moog Inc.

  • 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): 100 L/min (26.4 gpm)

  • Max Flow: ≈150 L/min

  • Internal Leakage: ≤2.2 L/min (lowest in D634)

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

  • 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: ≤16 ms (fastest in D634)

  • −3 dB Bandwidth: 70–80 Hz (highest in D634)

  • Hysteresis: <0.15% full scale

  • Resolution: <0.08% full scale

  • Null Drift (ΔT = 55 K): <1.0% 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 (70–80 Hz): For extreme‑speed closed‑loop systems

  • Lowest leakage & highest resolution: Precision control for aerospace test stands

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

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

  • Integrated PWM electronics: Compact, IP65 protection

7. Typical Applications

  • Aerospace structural fatigue test rigs (high‑cycle, high‑precision)

  • High‑speed vibration simulation tables

  • Precision position/force control for lab & industrial test systems

  • High‑response hydraulic actuators for robotics & motion simulation

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.


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