Model Code Explanation (D661-4196)

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

4: High‑flow platform

19: 190 L/min nominal flow rating

6: Ultra‑high‑dynamic, single‑feedback, maximum‑response base (faster than 4195, matches 4187’s dynamics at higher flow)

(No suffix): Standard electronics, premium null stability

Technical Specifications

Part Number: D661-4196

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

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

Hydraulic

Nominal Flow (Δp = 35 bar): 190 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/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)Moog Inc.

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

Step Response (0→100%): ≤7 ms @ 210 bar (ultra‑fast, same as 4187)Moog Inc.

Hysteresis: <0.18% (closed‑loop)

Linearity: <±0.20%

Resolution: <0.07%

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 190 L/min flow)Moog Inc.

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

Key Features

190 L/min Nominal Flow: Ties 4195 as highest in 41xx; higher than 4187/4186/4178

Ultra‑High‑Dynamic Response: 7 ms step response (fastest 190 L/min model, matches 4187’s speed)Moog Inc.

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

Premium Null Stability: Superior null shift performance for long‑term precision

Single‑LVDT Precision: Reliable closed‑loop feedback for consistent accuracy at max flowMoog Inc.

Applications

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

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

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

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

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

Compatibility

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

Drop‑in upgrade for D661‑4195 (faster response) and 4187/4186/4178 (higher flow)Moog Inc.

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