Model Code Decoding

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

• R: 2x2‑way configuration (P→A, B→T, Y‑port required)

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

• K: Explosion‑proof “de” (ATEX II 2G EEx de IIB+H2 T4)

• 02: Rated flow 20 L/min (Δp=35 bar/land)

• M: Spool position feedback (4–20 mA)

• O: Seal material NBR (Buna)

• V: Signal ±10 VMoog Inc.

• S: 6+PE connector (EN 175201)Moog Inc.

• M2: Mid‑position fail‑safe (spring‑centered)

Technical Specifications

• Part Number: D634R24K02MOVSM2

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

• Control Function: 2x2‑way flow control, spring‑centered

• Rated Flow (Δp=35 bar/land): 20 L/min (±10% tolerance)

• Max Flow: 38 L/min

• Operating Pressure:

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

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

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

• Hysteresis: <0.2%

• Electrical:

  • Supply: 24 VDC (18–32 VDC), 2.2 A max

  • Signal: ±10 V (V code)Moog Inc.

  • Feedback: 4–20 mA (M code, spool position)

  • 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°C

  • Fluid: −20°C to +80°C

• Mass: ~9.5 kg

• Seals: NBR (O code); FPM optional

Interface & Communication Configuration

• Electrical Interface: ±10 V command + 24 VDC power + 4–20 mA spool position feedback

• Feedback: Integrated spool position sensor (closed‑loop control), 4–20 mA output (12 mA = center)

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

• Porting: P, A, B, T; Y‑port mandatory (for T > 50 bar)

Core Functions

1. 2x2‑way Design: Optimized for single‑direction flow control (P→A, B→T)

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

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

4. High Dynamic Response: ≤20 ms step response, ideal for fast 2‑way flow regulationMoog Inc.

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

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

7. Explosion‑Proof Construction: ATEX hazardous areas (flameproof + increased safety)

Application Scenarios

• Industrial Machinery: Injection molding, die‑casting, 2‑way hydraulic actuators

• Test & Simulation: Vibration test benches, material testing (single‑direction control)

• Process Control: High‑precision flow regulation in chemical/petrochemical systems

• Hazardous Areas: Oil & gas, pharmaceutical, offshore (ATEX compliance)

Compatibility Note

• Series Compatibility: Interchangeable with other D634R models (04/08/16/20/40 L/min)

• Key Difference (R vs K series):

  • K series: 4‑way flow control

  • R series: 2x2‑way flow control (single‑direction, Y‑port required)

• Replacement: Drop‑in upgrade for 2‑way proportional valves (e.g., MOOG D633R series)