Model Code Decoding

• D635: Series, NG06 (Cetop 3) pressure control valveMoog Inc.

• 640:

  • 6: Rated flow 40 L/min (Δp=35 bar/land)Moog Inc.

  • 4: Rated pressure 350 bar (max 400 bar)Moog Inc.

  • 0: 3‑way spool, linear, standard overlapMoog Inc.

• E: Revision E, FPM (Viton) seals, enhanced EMC, 24 VDC supplyMoog Inc.

Technical Specifications

• Part Number: D635-640E

• Valve Size: NG06 (Cetop 3 / ISO 4401‑03)Moog Inc.

• Control Function: 3‑way pressure control, spring‑centered (fail‑safe: A→T, P→B)Moog Inc.

• Rated Flow (Δp=35 bar/land): 40 L/min (±10% tolerance)Moog Inc.

• Max Flow: 45 L/minMoog Inc.

• Operating Pressure:Moog Inc.

  • P/A/B ports: 350 bar (4,000 psi)Moog Inc.

  • T port (without Y): 50 barMoog Inc.

  • Y port: Optional (210 bar T)Moog Inc.

• Response Time (0→100% step): ≤15 msMoog Inc.

• Hysteresis: <0.1%Moog Inc.

• Null Shift (ΔT=55 K): <1.5%Moog Inc.

• Linearity: <0.5%Moog Inc.

• Electrical:Moog Inc.

  • Supply: 24 VDC (19–32 VDC), 1.0 A maxMoog Inc.

  • Signal: 0–10 V, 0–10 mA, or 4–20 mA (command); 4–20 mA (pressure feedback)Moog Inc.

  • Connector: 6+PE (DIN 43563), IP65 (mated)Moog Inc.

• Fluid: Mineral oil (DIN 51524), viscosity 5–400 mm²/sMoog Inc.

• Temperature:Moog Inc.

  • Ambient: −20°C to +60°CMoog Inc.

  • Fluid: −20°C to +80°CMoog Inc.

• Mass: ~2.5 kgMoog Inc.

• Seals: FPM (Viton, high‑temp resistant)Moog Inc.

Interface & Communication Configuration

• Electrical Interface: Analog command (0–10 V / 0–10 mA / 4–20 mA) + 24 VDC power; 4–20 mA pressure feedbackMoog Inc.

• Feedback: Integrated pressure sensor (closed‑loop); no external transducer neededMoog Inc.

• Mounting: 4‑bolt NG06 (Cetop 3, M5 screws, 8–10 Nm torque)Moog Inc.

• Porting: P, A, B, T (Y port optional)Moog Inc.

Core Functions

1. Integrated Pressure Control: Onboard sensor + electronics, no external controller requiredMoog Inc.

2. 40 L/min High Flow: Highest flow in D635 3‑way seriesMoog Inc.

3. 350 Bar High Pressure: For heavy‑duty hydraulic systemsMoog Inc.

4. Direct‑Drive Linear Motor: No pilot flow, fast response, low hysteresisMoog Inc.

5. Fail‑Safe Spring Center: A→T, P→B on power lossMoog Inc.

6. Revision E: FPM seals, wide temp range, enhanced EMC protectionMoog Inc.

Application Scenarios

• Industrial Hydraulics: Injection molding, die‑casting, metal forming (pressure control)Moog Inc.

• Test Systems: Pressure cycling benches, component durability testersMoog Inc.

• Machine Tools: High‑pressure clamping, spindle preload controlMoog Inc.

• Hydraulic Presses: Closed‑loop pressure regulation for precision formingMoog Inc.

Compatibility & Key Differences

• Series Compatibility: Interchangeable with D635 2.5/5/10/20 L/min models (same NG06 mounting)Moog Inc.

• D635-640E vs D635-124E:

  • 640E: 40 L/min, 350 bar, 3‑way, FPM sealsMoog Inc.

  • 124E: 40 L/min, 350 bar, 3‑way, FPM seals (older revision)Moog Inc.

• Replacement: Drop‑in upgrade for lower‑flow D635 models or pilot‑operated pressure valves