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D634-1047

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D634-1047
May 25, 2026

D634-1047

The D634-1047 is a single-stage, direct-drive servo valve (DDV) in MOOG’s D634 family. It uses a permanent magnet linear force motor to drive the spool directly—no pilot oil required. Integrated 24 VDC electronics with LVDT closed-loop spool position feedback deliver high accuracy and fast response. Spring-centred design ensures the spool returns to neutral on power loss (fail-safe). Intended for high-precision closed-loop motion control requiring 60 L/min rated flow, low leakage, and pressure-independent dynamics.

Description

1. General Description

The D634-1047 is a single-stage, direct-drive servo valve (DDV) in MOOG’s D634 family. It uses a permanent magnet linear force motor to drive the spool directly—no pilot oil requiredMoog Inc.. Integrated 24 VDC electronics with LVDT closed-loop spool position feedback deliver high accuracy and fast response. Spring-centred design ensures the spool returns to neutral on power loss (fail-safe)Moog Inc.. Intended for high-precision closed-loop motion control requiring 60 L/min rated flow, low leakage, and pressure-independent dynamics.

2. Hydraulic Specifications

  • Max working pressure (P, A, B): 350 bar (5,000 psi)

  • Port T pressure: 50 bar (no Y drain); 350 bar (with Y drain)

  • Rated flow (Δp=35 bar per land): 60 L/min (15.8 gpm)

  • Max flow: ~185 L/min (~48.8 gpm)

  • Internal leakage: ≤0.55 L/min

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

  • Fluid temp: −20 °C to +80 °C (−4 °F to +176 °F)

  • Filtration: ISO 4406 17/14/11 or better

  • Weight: ~6.3 kg (13.9 lb)

3. Dynamic Performance

Typical for D634-1047 (60 L/min version):

  • Step response (0→100% stroke): 10–12 ms

  • −3 dB bandwidth: 110–120 Hz

  • Hysteresis: <0.4% full scale

  • Resolution: <0.1% full scale

  • Null drift (60 K change): <0.8% full scale

4. Electrical Specifications

  • Supply voltage: 24 VDC (18–32 VDC)

  • Max current: 3.5 A

  • Control signals (jumper-selectable): ±10 V, ±10 mA, 4–20 mA

  • Feedback signal: 0–10 VDC (spool position)

  • Connector: M18, 6 pins + PE, IP65

  • Ambient temp: −20 °C to +60 °C (−4 °F to +140 °F)

  • EMC: CE compliantMoog Inc.

5. Key Features

  • Pilotless direct drive: Faster response, simpler installation, no pilot supply neededMoog Inc.

  • LVDT closed loop: High positioning accuracy and repeatability

  • Pressure-independent dynamics: Stable response under varying load pressuresMoog Inc.

  • Low leakage: Reduces energy consumption

  • Fail-safe spring centring: Safe, predictable shutdown on power lossMoog Inc.

6. Applications

  • High-speed hydraulic presses

  • Dynamic material & fatigue test rigs

  • Injection moulding & die-casting machines

  • High-precision position/velocity/pressure control systemsMoog Inc.

7. Mounting & Wiring

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

  • Wiring (shielded twisted pair recommended):

    • Pin 1: +24 VDC

    • Pin 2: Power GND

    • Pin 3: Command +

    • Pin 4: Command −

    • Pin 5: Spool position feedback

    • Pin 6: Feedback GND

    • PE: Protective earth

If you want, I can give you a compact D634‑1045 / 1046 / 1047 comparison table (rated flow, bandwidth, typical use cases) so you can quickly tell them apart.


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