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D634-1034

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D634-1034
May 25, 2026

D634-1034

D634-1034 is a single‑stage, direct‑drive servo valve with integrated 24 VDC electronics and LVDT closed‑loop spool position feedback. It uses a permanent magnet linear force motor—no pilot oil required—for high reliability and fast response. The valve is a 4‑way, spring‑centered, zero‑lap spool design, offering fail‑safe operation by returning to neutral when power is lost

Description

1. General Description

D634-1034 is a single‑stage, direct‑drive servo valve with integrated 24 VDC electronics and LVDT closed‑loop spool position feedback. It uses a permanent magnet linear force motor—no pilot oil required—for high reliability and fast response. The valve is a 4‑way, spring‑centered, zero‑lap spool design, offering fail‑safe operation by returning to neutral when power is lostMoog Inc..

  • Series: D634 (ISO 4401 Size 05 / NG10)

  • Model 1034: ultra‑high‑flow, standard‑dynamic response, low‑leakage

  • Applications: High‑speed/high‑force hydraulic presses; dynamic material testing; flight simulators; industrial motion control requiring maximum flow + stability.

2. Hydraulic Specifications

  • Max working pressure (P, A, B): 350 bar (5,000 psi)Moog Inc.
  • Port T pressure: 50 bar (725 psi) (without Y port); 350 bar (5,000 psi) (with Y port)Moog Inc.
  • Rated flow (Δp = 35 bar/land): 125–135 L/min (33.0–35.7 gpm)
  • Max flow: approx. 250 L/min (66.0 gpm)
  • Internal leakage: ≤0.50 L/min (low‑leakage version)
  • Operating fluid: Mineral oil per ISO 11158 / DIN 51524
  • Fluid temperature: −20 °C to +80 °C
  • Recommended cleanliness: ISO 4406 17/14/11

3. Performance Characteristics

  • Step response (0→100%): 16–18 ms

  • Frequency response (−3 dB): ≥75–85 Hz

  • Hysteresis: <0.45% FS

  • Resolution: <0.12% FS

  • Null drift (ΔT = 60 K): <1.1% FS

  • Repeatability: <0.30% FS

4. Electrical Specifications

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

  • Max current: 4.0 A

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

  • Feedback: 0–10 VDC spool position output

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

  • Ambient temperature: −20 °C to +60 °C

  • EMC: Compliant with CE directives

5. Working Principle

An LVDT sensor continuously measures spool position and feeds the signal to the integrated electronics. The controller compares actual position with command signal, then drives the linear force motor to move the spool. This closed‑loop control ensures precise flow and direction regulation. The spring‑centered design ensures safe shutdown on power failureMoog Inc..

6. Installation Instructions

  • Mount on a clean, flat surface per ISO 4401‑05 mounting pattern.

  • Torque mounting bolts to manufacturer specs; avoid impact or misalignment.

  • Install horizontally for optimal air bleeding.

  • Bleed all air from valve and piping before operation.

7. Wiring Definition

  • Pin 1: +24 VDC

  • Pin 2: Power GND

  • Pin 3: Command +

  • Pin 4: Command −

  • Pin 5: Feedback Out

  • Pin 6: Feedback GND

  • PE: Protective Earth (frame ground)

  • Use shielded twisted‑pair cables for signals.

8. Maintenance Notes

  • Sealed integral construction; no user‑serviceable internal parts.

  • Monitor fluid contamination; replace filters regularly to maintain ISO 4406 17/14/11 cleanliness.

  • Inspect connector and cables periodically for damage or corrosion.

  • Unauthorized disassembly voids warranty.


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