Model Code Decoding

• D651: Base series, ISO 4401 Form A10 (CETOP 5) pQ valve, two‑stage nozzle‑flapper pilot, rated flow 23–35 L/min (Δp=10 bar).

• 109:

  • 1: 4‑way main spool, standard flow/pressure characteristic, internal pilot supply.

  • 0: Pressure rating 350 bar (P/A/B ports), standard seal material (NBR).

  • 9: Analog interface (0–10 V / 0–10 mA / 4–20 mA), no fieldbus, factory default firmware.

Technical Specifications

• Part Number: D651-109

• Valve Size: ISO 4401 Form A10 (CETOP 5), port diameter 10.5 mm.

• Control Function: 4‑way pQ control (flow control with superimposed pressure limiting; selectable pressure control mode).

• Rated Flow (Δp=10 bar): 23 L/min (±10%).

• Max Operating Pressure:

  • P/A/B ports: 350 barMoog Inc..

  • T port: 210 bar (standard); 350 bar optionalMoog Inc..

  • Pilot stage: 15–210 barMoog Inc..

• Response Time: 10–15 ms (0→100% step, 210 bar).

• Hysteresis: <1.0% (flow); <0.2% (pressure)Moog Inc..

• Linearity: <1.0% (flow); <0.5% (pressure)Moog Inc..

• Electrical:

  • Supply: 24 VDC (18–32 VDC), max current 1.8 A.

  • Command: 0–10 V / 0–10 mA / 4–20 mA (selectable)Moog Inc..

  • Feedback: Spool position (0–10 V / 0–10 mA); pressure (0–10 V)Moog Inc..

  • Protection Class: IP65 (mated connector).

• Fluid: Mineral oil per DIN 51524; viscosity 5–400 mm²/s (recommended 15–45 mm²/s)Moog Inc..

• Temperature:

  • Ambient: −20°C to +60°CMoog Inc..

  • Fluid: −20°C to +80°CMoog Inc..

• Mass: Approximately 6.4 kgMoog Inc..

• Seals: NBR (standard); FPM/EPDM optionalMoog Inc..

Interface & Communication Configuration

• Electrical Interface: Dual analog ports (flow + pressure), 24 VDC power, no fieldbus in standard configurationMoog Inc..

• Feedback: Integrated LVDT for spool position; onboard pressure sensor for closed‑loop pQ regulation.

• Mounting: ISO 4401 Form A10 (CETOP 5) 4‑hole pattern; M6 bolts, torque 12–14 NmMoog Inc..

• Porting: P, A, B, T main ports; internal pilot supply (port P), external pilot (port X) optionalMoog Inc..

Core Functions

1. Combines precise flow control and pressure limiting/regulation in a single compact unit, reducing system complexity.

2. 350 bar pressure rating supports heavy‑duty industrial hydraulic applications.

3. Two‑stage nozzle‑flapper pilot design delivers fast response and high resolution.

4. Integrated digital electronics enable closed‑loop control with minimal external components.

5. Selectable pressure control mode allows seamless switching between flow and pressure regulation.

6. Robust construction with IP65 protection ensures reliable operation in harsh industrial environments.

Application Scenarios

• Used in hydraulic presses and metal forming machines requiring synchronized flow and pressure control.

• Applied to injection molding machines for precise speed and clamping force regulation.

• Suitable for test benches needing accurate flow/pressure profiling and closed‑loop control.

• Deployed in material handling and die‑casting equipment with high‑force and dynamic requirements.

• Ideal for all industrial hydraulic systems demanding compact, high‑performance pQ control.

Compatibility & Differences

• Basic configuration: 4‑way analog pQ valve, 23 L/min, 350 bar, internal pilot, NBR seals.

• Compared with other D651 models: Variants differ in flow rate (23/35 L/min), porting (3/4/5‑way), and electrical interface (analog/fieldbus).

• Interchangeability: Same ISO 4401 Form A10 mounting as other D651/D656 series valves; verify electrical and pressure ratings before replacement.