Model Code Explanation (D661-4313C)

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

4: High‑flow platform

31: 310 L/min nominal flow rating

3: Ultra‑high‑dynamic, single‑feedback base

C: Standard electronics, high‑null‑stability trim

Technical Specifications

Part Number: D661-4313C

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): 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)

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); optional ±10 mAMoog Inc.

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

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

Step Response (0→100%): ≤6.5 ms @ 210 bar (ultra‑high‑dynamic, fastest in D661‑4xxx)

Hysteresis: <0.18% (closed‑loop)

Linearity: <±0.20%

Resolution: <0.05%

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 310 L/min flow)Moog Inc.

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

Key Features

310 L/min Nominal Flow: Highest in D661‑4xxx series

Ultra‑High‑Dynamic Response: 6.5 ms step response (fastest high‑flow model)

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

High Null Stability: “C” trim minimizes null shift for long‑term precision

Single‑LVDT Precision: Reliable closed‑loop feedback for max‑flow accuracy

Applications

Ultra‑high‑flow dynamic test benches (aerospace/defense, high‑speed fatigue)

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

Metallurgy (high‑dynamic roll gap control, extreme‑tension systems)

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

Energy (high‑flow/high‑speed hydraulic control, turbine governing)

Compatibility

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

Drop‑in upgrade for D661‑4303E/4209 (higher flow, faster response)

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