Model Code Explanation (D661-4195)

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

4: High‑flow platform

19: 190 L/min nominal flow rating

5: High‑dynamic, single‑feedback, standard‑response base

(No suffix): Standard electronics, premium null stability

Technical Specifications

Part Number: D661-4195

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

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

Hydraulic

Nominal Flow (Δp = 35 bar): 190 L/min (±8%)Moog Inc.

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)Moog Inc.

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

Step Response (0→100%): ≤10 ms @ 210 barMoog Inc.

Hysteresis: <0.20% (closed‑loop)

Linearity: <±0.25%Moog Inc.

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 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: Highest in 41xx sub‑series; higher than 4187/4186/4178

High‑Dynamic Response: 10 ms step response for high‑speed, high‑flow control

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

Premium Null Stability: Excellent null shift performance for long‑term precisionMoog Inc.

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

Applications

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

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

Metallurgy (high‑flow 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)Moog Inc.

Drop‑in upgrade for D661‑4187/4186/4178 (higher flow)

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