D634-1046
May 25, 2026

D634-1046

The D634-1046 is a high-flow, single-stage direct drive servo valve (DDV) from MOOG’s D634 series. 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 ensure high accuracy and dynamic response. Spring-centred design provides fail-safe neutral position on power loss. Typical uses include high-speed hydraulic presses, fatigue test rigs, and closed-loop motion control needing 100 L/min flow + fast response + low leakage.

Description

1. General Description

The D634-1046 is a high-flow, single-stage direct drive servo valve (DDV) from MOOG’s D634 seriesMoog Inc.. 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 ensure high accuracy and dynamic response. Spring-centred design provides fail-safe neutral position on power lossMoog Inc.. Typical uses include high-speed hydraulic presses, fatigue test rigs, and closed-loop motion control needing 100 L/min flow + fast response + low leakage.

2. Hydraulic Specifications

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

  • Port T pressure: 50 bar (no Y port); 350 bar (with Y port)Moog Inc.

  • Rated flow (Δp=35 bar per land): 100 L/min (26.4 gpm)

  • Max flow: ~185–190 L/min (~50 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

  • Step response (0→100% stroke): 10–12 msMoog Inc.

  • −3 dB bandwidth: 100–110 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)Moog Inc.

  • Max current: 3.5 A

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

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

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

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

  • EMC: CE compliant

5. Features

  • Pilotless direct drive: Faster response, simpler installationMoog Inc.

  • LVDT closed loop: High positioning accuracy and repeatability

  • Pressure-independent dynamics: Stable performance under varying loadsMoog Inc.

  • Low leakage: Reduces energy loss

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

6. Applications

  • High-speed hydraulic presses

  • Dynamic material testing systems

  • Fatigue and vibration test benches

  • High-precision closed-loop position/velocity/pressure control

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


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