Model Code Explanation (D661-4334C)

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

4: High‑flow platform

33: 330 L/min nominal flow (Δp=35 bar)

4: High dynamic response (faster than “2” version)

C: Standard electronics, high‑null‑stability trim

Technical Specifications

Part Number: D661-4334C

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): 330 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)Moog Inc.

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

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

Step Response (0→100%): ≤7 ms @ 210 bar (faster than 4332C)

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)

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

Key Features

330 L/min Ultra‑High Flow: Top flow in D661‑4xxx series

Fast 7 ms Response: “4” code gives quicker dynamics than 4332C

350 bar High Pressure: Heavy‑duty rating for industrial systemsMoog Inc.

High Null Stability (“C”): Low null shift for long‑term precision

Voltage Command: ±10 V input, standard controller compatibility

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 D661‑4332C/431D‑5/4313C/4303E (ISO 4401‑05)

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

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