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D634-301C

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D634-301C
May 25, 2026

D634-301C

The D634‑301C is a 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 provide high accuracy and dynamic response largely independent of supply pressure. Spring‑centered design ensures the spool returns to neutral on power loss (fail‑safe). The 301C is calibrated for medium flow, very high dynamics, precision closed‑loop control.

Description

1. General Description

The D634‑301C is a 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穆格中国. Integrated 24 VDC electronics with LVDT closed‑loop spool position feedback provide high accuracy and dynamic response largely independent of supply pressure. Spring‑centered design ensures the spool returns to neutral on power loss (fail‑safe)穆格中国. The 301C is calibrated for medium flow, very high dynamics, precision closed‑loop control.

2. Hydraulic Specifications

  • Mounting: ISO 4401 Size 05 (NG10)

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

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

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

  • Maximum flow: approx. 185 L/min (48.8 gpm)

  • Internal leakage: ≤ 0.5 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. 6.3 kg (13.9 lb)

3. Dynamic Performance (Typical)

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

  • −3 dB bandwidth: 70–80 Hz

  • Hysteresis: < 0.3% of full scale

  • Resolution: < 0.05% of full scale

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

4. Electrical Specifications

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

  • Max operating current: 3.0 A

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

  • 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

  • Pilot‑free direct drive: simple installation, high reliability穆格中国

  • Ultra‑high dynamic response: for high‑speed, high‑precision axes

  • Integrated closed‑loop control: precise, repeatable positioning

  • Pressure‑independent dynamics: stable under varying loads穆格中国

  • Spring‑centered fail‑safe: safe shutdown on power loss穆格中国

6. Applications

  • High‑speed & high‑precision hydraulic axes

  • Dynamic material testing & fatigue systems

  • High‑speed injection molding machines

  • Machine tool actuators & precision motion control

  • Industrial automation requiring fast response

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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