Technical Specifications

• Part Number: D634K2008C

• Valve Size: ISO 4401-05 (size 05)

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

• Rated Flow (Δp=5 bar/land): 80 L/min (±10% tolerance)Moog Inc.

• Max Flow: 185 L/minMoog Inc.

• Operating Pressure:

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

  • T port (without Y): 50 bar; (with Y): 350 barMoog Inc.

• Response Time (0→100% step): ≤20 ms

• Hysteresis: <0.2%Moog Inc.

• Electrical:

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

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

  • Connector: 6+PE (EN 175201)

  • Protection: IP65 (mated)Moog Inc.

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

• Temperature:

  • Ambient: -20°C to +60°C

  • Fluid: -20°C to +80°C

• Mass: ~7 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)

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

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

Core Functions

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

2. Integrated Closed-Loop Control: Onboard electronics for spool position feedback, high accuracy

3. High Dynamic Response: 20 ms step response, ideal for fast positioning/force control

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

5. Fail-Safe Spring Center: Spool returns to mid-position on power lossMoog Inc.

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

Application Scenarios

• Industrial Machinery: Injection molding, die-casting, metal forming presses

• Test & Simulation: Flight simulators, vibration test benches, material testingMoog Inc.

• Robotics & Motion Control: High-precision hydraulic actuators, synchronized motion

• Heavy Equipment: Construction, marine, and offshore hydraulic systemsMoog Inc.

Compatibility Note

• Series Compatibility: Interchangeable with other D634K models (D634K2005C/2006C/2007C/2009C)

• Replacement: Drop-in upgrade for older pilot-operated servo valves (e.g., MOOG D660 series)

• System Requirements: 24 VDC power supply, analog controller, ISO 4401-05 manifold