Model Code Explanation (D661-4303E)

D661: Series (ISO 4401‑05, integrated 24 VDC electronics)

4: High‑flow platform

30: 300 L/min nominal flow rating

3: High‑dynamic, single‑feedback base

E: Enhanced electronics, improved null stability

Technical Specifications

Part Number: D661-4303E

Mounting: ISO 4401‑05 (NG10), 4‑hole, M5 screws (torque 8 Nm)

Control Function: 4‑way/3‑position, spring‑centered, zero‑lap, closed‑loop control

Hydraulic

Nominal Flow (Δp = 35 bar): 300 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), viscosity 15–45 mm²/sMoog Inc.

Temperature: Ambient −20°C to +60°C; Fluid −20°C to +80°CMoog Inc.

Weight: Approx. 5.8–6.0 kg

Electrical

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

Command Signal: ±10 V differential (10 kΩ impedance); optional ±10 mAMoog Inc.

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

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

Step Response (0→100%): ≤8 ms @ 210 bar (high‑dynamic performance)Moog Inc.

Hysteresis: <0.20% (closed‑loop)

Linearity: <±0.25%

Resolution: <0.08%

Interface & Communication

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

Feedback: Single integrated LVDT (full‑stroke closed‑loop, high‑accuracy for 300 L/min flow)

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

Key Features

300 L/min Nominal Flow: Higher than D661‑4209/4196/4195

High‑Dynamic Response: 8 ms step response (fast for high‑flow models)

High‑Pressure Rated: 350 bar max working pressure for heavy‑duty applicationsMoog Inc.

Enhanced Null Stability: “E” suffix improves null shift for long‑term precision

Single‑LVDT Precision: Reliable closed‑loop feedback for consistent accuracy

Applications

High‑flow dynamic test benches (aerospace, defense, large component fatigue)

Heavy‑duty industrial automation (large forging presses, steel rolling mills)

Metallurgy (high‑precision roll gap control, high‑tension systems)

Heavy machinery (mining excavators, high‑tonnage die‑casting)

Energy (high‑flow hydraulic control, turbine governing systems)

Compatibility

Interchangeable with D661 (G/C/A), D662/D663 (ISO 4401‑05)

Drop‑in upgrade for D661‑4209/4196/4195 (higher flow, faster response)

Requires 24 VDC supply, analog controller (±10 V in / 4–20 mA out), ISO 4401‑05 manifold