Model Code Explanation (D661-431D-5)

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

4: High‑flow platform

31: 310 L/min nominal flow (Δp=35 bar)

D: ±10 V command signal, 4–20 mA LVDT feedback

5: Enhanced electronics revision, improved noise immunity

Technical Specifications

Part Number: D661-431D-5

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

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

Hydraulic

Nominal Flow (Δp=35 bar): 310 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)Moog Inc.

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

Fluid: Mineral oil (DIN 51524), viscosity 15–45 mm²/s

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

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)Moog Inc.

Feedback Signal: 4–20 mA (single LVDT, ±0.02% FS accuracy)Moog Inc.

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

Step Response (0→100%): ≤7 ms @ 210 barMoog 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 LVDT feedbackMoog Inc.

Feedback: Single integrated LVDT (full‑stroke closed‑loop)Moog Inc.

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

Key Features

310 L/min High Flow: Matches D661‑4313C, higher than 4303E

Fast Dynamic Response: 7 ms step response for high‑speed applicationsMoog Inc.

350 bar High Pressure: Rated for heavy‑duty industrial systemsMoog Inc.

Enhanced “‑5” Revision: Better EMC performance, stable null

Voltage Command (D): ±10 V input, compatible with standard controllersMoog Inc.

Applications

High‑flow dynamic test benches (aerospace, defense)

Heavy‑duty forging presses and steel rolling mills

High‑precision metallurgical roll gap control

Large injection molding and die‑casting machines

Mining excavators and high‑tonnage hydraulic machinery

Compatibility

Interchangeable with D661‑4313C/4303E (ISO 4401‑05)

Drop‑in upgrade for lower‑flow D661‑4209/4196/4195

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