D634-307C
May 25, 2026

D634-307C

The D634‑307C is the highest‑flow single‑stage direct‑drive servo valve in the MOOG 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 dynamics largely independent of supply pressure. Spring‑centered design provides fail‑safe return to neutral on power loss. The 307C is calibrated for maximum flow, medium dynamics, closed‑loop position/velocity/pressure control.

Description

1. General Description

The D634‑307C is the highest‑flow single‑stage direct‑drive servo valve in the MOOG 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 dynamics largely independent of supply pressure. Spring‑centered design provides fail‑safe return to neutral on power loss. The 307C is calibrated for maximum flow, medium dynamics, closed‑loop position/velocity/pressure control.

2. Hydraulic Specifications

  • Mounting: ISO 4401 Size 05 (NG10)

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

  • T‑port pressure: 50 bar (without Y‑port); 350 bar (with Y‑port)

  • Rated flow (Δp = 35 bar per land): 120 L/min (31.7 gpm)

  • Maximum flow: approx. 220 L/min (58.1 gpm)

  • Internal leakage: ≤ 1.0 L/min

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

  • Fluid temperature: −20 °C to +80 °C

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

  • Weight: approx. 6.5 kg (14.3 lb)

3. Dynamic Performance (Typical)

  • Step response (0 → 100% stroke): ≤ 22 msMoog Inc.

  • −3 dB bandwidth: 55–65 Hz

  • Hysteresis: < 0.5% of full scale

  • Resolution: < 0.1% of full scale

  • Null drift (60 K temp change): < 1.5% of full scale

4. Electrical Specifications

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

  • Max operating current: 3.5 A

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

  • Spool position feedback output: 0–10 VDC

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

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

  • EMC: CE compliant

5. Key Features

  • Ultra‑high‑flow direct drive: 120 L/min rated, no pilot supply needed

  • Integrated LVDT closed‑loop: good linearity and repeatability

  • Pressure‑independent dynamics: stable under heavy, varying loads

  • Higher leakage design: optimized for maximum flow, not minimal leakage

  • Spring‑centered fail‑safe: safe shutdown on power loss

6. Applications

  • Ultra‑high‑flow hydraulic axes

  • Heavy‑duty presses & large industrial machinery

  • High‑capacity injection molding & die‑casting machines

  • Large‑scale material testing & fatigue systems

  • General‑purpose high‑flow closed‑loop control

7. Wiring Definition

  • Pin 1: +24 VDC

  • Pin 2: Power ground

  • Pin 3: Command signal (+)

  • Pin 4: Command signal (−)

  • Pin 5: Spool position feedback (0–10 VDC)

  • Pin 6: Feedback ground

  • PE: Protective earth

  • Recommendation: Use shielded twisted‑pair cable for signals.


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