Model Code Decoding

• D636: Base series, NG06 (size 03) flow control servo valveMoog Inc.

• 225:

  • 2: Rated flow 20 L/min (Δp=35 bar/land)穆格中国

  • 2: Max pressure 350 bar (P/A/B ports)Moog Inc.

  • 5: 4-way spool, linear, zero overlap, spring-centered

• 0000: Standard analog interface (±10 V), no fieldbus, standard electronics, no special optionsMoog Inc.

Technical Specifications

• Part Number: D636-225-0000

• Valve Size: NG06 (ISO 4401-03, Cetop 3)Moog Inc.

• Control Function: 4-way flow control, spring-centered (fail-safe: P→A, B→T on power loss)穆格中国

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

• Max Flow: 38 L/min穆格中国

• Operating Pressure:

  • P/A/B ports: 350 bar

  • T port: 50 bar (std) / 350 bar (Y-port option)Moog Inc.

• Step Response (0→100%): ≤8 ms (210 bar)穆格中国

• Hysteresis: <0.1%

• Linearity: <0.3%

• Electrical:

  • Supply: 24 VDC (18–32 VDC), 1.0 A maxMoog Inc.

  • Command: ±10 V (std)Moog Inc.

  • Feedback: LVDT (spool position, internal)

  • Protection: IP65 (mated connector)

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

• Temperature:

  • Ambient: −20°C to +60°CMoog Inc.

  • Fluid: −20°C to +80°CMoog Inc.

• Mass: ~2.5 kgMoog Inc.

• Seals: NBR (std) / FPM (Viton, option)Moog Inc.

Interface & Communication Configuration

• Electrical Interface: Analog ±10 V command + 24 VDC; no fieldbus (0000)Moog Inc.

• Feedback: Integrated LVDT (closed-loop spool position control)

• Mounting: 4-hole NG06 (ISO 4401-03), M5 bolts, 8–10 NmMoog Inc.

• Porting: P, A, B, T; Y-port available (high backpressure)Moog Inc.

Core Functions

1. 350 Bar High Pressure: Heavy-duty industrial hydraulics

2. 20 L/min Precise Flow: Compact, high-accuracy flow control

3. Direct-Drive Design: No pilot oil, pressure-independent dynamicsMoog Inc.

4. Integrated Digital Electronics: Onboard closed-loop, no external controller

5. Fast Response: ≤8 ms step response, low hysteresis/non-linearity穆格中国

6. Fail-Safe Spring Center: Safe position on power loss穆格中国

Application Scenarios

• Industrial Automation: High-precision positioning, velocity control

• Test Benches: Fatigue, vibration, and component durability testing

• Machine Tools: High-speed, accurate hydraulic actuators

• Plastics Machinery: Injection molding, extrusion control

• General Hydraulics: Medium-pressure, dynamic flow control systems

Compatibility & Differences

• Base Model: D636-225-0000 = standard analog 20 L/min/350 bar 4-way valve

• vs D636-225-0001: 0001 = minor firmware revision, same specs

• vs D636-405-0000: 405 = 40 L/min, same pressure/interface

• vs D637-225-0000: D637 = NG10 (size 05), higher flow (up to 100 L/min)Moog Inc.