Model Code Explanation (D661-4158B)

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

4: High‑flow platform

15: 150 L/min nominal flow rating

8: High‑dynamic, single‑feedback, high‑response base

B: Standard electronics, enhanced null stability

Technical Specifications

Part Number: D661-4158B

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): 150 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 450 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%): ≤12 ms @ 210 bar (faster than 4157B)

Hysteresis: <0.25% (closed‑loop)

Linearity: <±0.30%

Resolution: <0.10%

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 150 L/min flow)Moog Inc.

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

Key Features

150 L/min Nominal Flow: High‑flow capacity for heavy‑duty industrial hydraulic systems

High‑Dynamic Response: 12 ms step response for fast, precise control

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

Enhanced Null Stability (B): Improved null shift performance for long‑term precision

Single‑LVDT Precision: Reliable closed‑loop feedback for consistent accuracy at high flow

Applications

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

High‑dynamic test benches (fatigue testing, high‑load simulation)

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 D661‑4157B (same flow, faster response) and lower‑flow models (4125E/4099)

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