Model Code Explanation (D661-4384C)

• D661: Series (ISO 4401‑05, 24 VDC integrated electronics, bushing‑type spool)

• 4: High‑flow platform

• 38: 380 L/min nominal flow (Δp=35 bar)

• 4: High dynamic response (6.5–8 ms step response)

• C: High‑stability electronics, enhanced null performance

• (Implied G): Standard spool (zero‑lap, linear), ServoJet® pilot

Technical Specifications

Hydraulic

• Nominal Flow (Δp=35 bar): 380 L/min (±8%)

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

• Pilot Pressure (X): 21–280 bar (internal P or external X)

• T Port Pressure (Y internal): 210 bar; (Y external): 350 barMoog Inc.

• Fluid: Mineral oil (DIN 51524), NBR seals (−20°C to +80°C)

• Temperature: Ambient −20°C to +60°C; Fluid −20°C to +80°C

• Weight: Approx. 5.7 kg

Electrical

• Supply: 24 VDC (18–32 VDC), quiescent 230 mA, dynamic ~500 mAMoog Inc.

• Command Signal: ±10 V differential (10 kΩ impedance)Moog Inc.

• Feedback Signal: Optional 4–20 mA (single LVDT, ±0.02% FS accuracy)

• Connector: 6+PE (EN 175201‑804), IP65 (connected)Moog Inc.

• Step Response (0→100%): ≤8 ms @ 210 bar

• Hysteresis: <0.25% (closed‑loop)

• Linearity: <±0.30%

• Resolution: <0.10%

Interface & Communication

• Electrical: 6+PE connector; ±10 V command, 24 VDC power, optional 4–20 mA LVDT feedbackMoog Inc.

• Feedback: Single integrated LVDT (full‑stroke closed‑loop, optional)

• Ports: P, A, B, T; optional external X (pilot) and Y (return)

Key Features

• 380 L/min High Flow: Matches ultra‑high‑flow system demands

• 8 ms High Response: Fast dynamics for precision motion control

• High‑Stability Electronics: Enhanced null stability for long‑term accuracy

• ServoJet® Pilot: Reduced hysteresis, improved pressure gainMoog Inc.

• ±10 V Analog Interface: Wide compatibility with industrial controllers

Applications

• High‑speed industrial test benches

• Precision forging presses and steel rolling mills

• Large injection molding and die‑casting machines

• High‑tonnage hydraulic machinery requiring fast response

• Closed‑loop systems prioritizing speed and stability

Compatibility

• Interchangeable with D661‑4380E/4375B/4352C (ISO 4401‑05)

• Drop‑in upgrade for lower‑flow D661‑4209/4196

• Requires 24 VDC supply, ±10 V controller, ISO 4401‑05 manifold