Model Code Decoding

• D634: Series, ISO 4401‑05 (NG10) size

• Z: High‑flow 4‑way configuration (standard D634 = 60–100 L/min; Z = higher flow)

• 10: Rated flow 100 L/min (Δp=35 bar/land)

• 20: Version 20 (hardware/software revision)

Technical Specifications

• Part Number: D634Z1020

• Valve Size: ISO 4401‑05 (Size 05 / NG10)

• Control Function: 4‑way flow control, spring‑centered

• Rated Flow (Δp=35 bar/land): 100 L/min (±10% tolerance)

• Max Flow: 180 L/min

• Operating Pressure:

  • P/A/B ports: 350 bar (5,000 psi)Moog Inc.

  • T port (without Y): 50 bar; (with Y): 210 barMoog Inc.

• Response Time (0→100% step): ≤20 msMoog Inc.

• Hysteresis: <0.2%Moog Inc.

• Electrical:

  • Supply: 24 VDC (18–32 VDC), 3.0 A maxMoog Inc.

  • Signal: ±10 V, ±10 mA, or 4–20 mAMoog Inc.

  • Connector: 6+PE (EN 175201), IP65 (mated)Moog Inc.

• Fluid: Mineral oil (DIN 51524), viscosity 15–100 mm²/s

• Temperature:

  • Ambient: −20°C to +60°CMoog Inc.

  • Fluid: −20°C to +80°C

• Mass: ~7.9 kgMoog Inc.

• Seals: NBR (standard); FPM optional

Interface & Communication Configuration

• Electrical Interface: Analog command (±10 V / ±10 mA / 4–20 mA) + 24 VDC powerMoog Inc.

• Feedback: Integrated spool position sensor (closed‑loop control); optional 2–10 V / 4–20 mA actual‑value outputMoog Inc.

• Mounting: 4‑bolt ISO 4401‑05 pattern (M6 screws, 11–13 Nm torque)Moog Inc.

• Porting: P, A, B, T; optional drain Y (for T > 50 bar)Moog Inc.

Core Functions

1. High‑Flow 4‑way Design: Optimized for 100 L/min rated flow, suitable for large‑bore actuators

2. Direct‑Drive Linear Motor: No pilot flow, high force, pressure‑independent dynamicsMoog Inc.

3. Integrated Closed‑Loop Control: Onboard electronics for spool position feedback, high accuracyMoog Inc.

4. High Dynamic Response: ≤20 ms step response, ideal for fast high‑flow positioning/force controlMoog Inc.

5. Low Hysteresis & High Resolution: <0.2% hysteresis, precise repeatabilityMoog Inc.

6. Fail‑Safe Spring Center: Spool returns to mid‑position on power lossMoog Inc.

7. Low Power Consumption: 9.6 W at null, efficient for multi‑valve systemsMoog Inc.

Application Scenarios

• Industrial Machinery: Large injection molding, die‑casting, heavy‑duty metal forming presses

• Test & Simulation: Large‑scale flight simulators, high‑force vibration test benches

• Hydraulic Actuation: High‑precision control of large‑bore hydraulic cylinders

• Process Control: High‑flow, high‑dynamic flow regulation in heavy industry

Compatibility Note

• Series Compatibility: Interchangeable with standard D634 4‑way models (60/80/100 L/min)

• Key Difference (Z vs standard D634):

  • Standard D634: 60–100 L/min, general industrial

  • D634Z: Optimized for 100 L/min high‑flow, enhanced internal flow paths

• Replacement: Drop‑in upgrade for lower‑flow D634K series or pilot‑operated high‑flow servo valves