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D634-1031

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D634-1031
May 25, 2026

D634-1031

The D634-1031 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

The D634-1031 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.

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

  • Model: 1031 = medium‑flow, high‑dynamic response, standard‑leakage

  • Applications: High‑speed hydraulic presses; material testing; flight simulators; general motion control requiring fast response + good flow.

2. Hydraulic Specifications

  • Max working pressure (P, A, B): 350 bar (5,000 psi)
  • 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): 80–90 L/min (21.1–23.8 gpm)
  • Max flow: approx. 200 L/min (52.8 gpm)
  • Internal leakage: ≤0.60 L/min
  • 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%): 14–16 ms

  • Frequency response (−3 dB): ≥90–100 Hz

  • Hysteresis: <0.40% FS

  • Resolution: <0.10% FS

  • Null drift (ΔT = 60 K): <1.0% FS

  • Repeatability: <0.25% FS

4. Electrical Specifications

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

  • Max current: 3.2 A

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

  • Feedback: 0–10 VDC spool position outputMoog Inc.

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

  • Ambient temperature: −20 °C to +60 °CMoog Inc.

  • 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 failure.

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 VDCMoog Inc.

  • Pin 2: Power GNDMoog Inc.

  • Pin 3: Command +Moog Inc.

  • Pin 4: Command −Moog Inc.

  • Pin 5: Feedback OutMoog Inc.

  • Pin 6: Feedback GNDMoog Inc.

  • PE: Protective Earth (frame ground)Moog Inc.

  • 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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