I. Core Parameters (Official Standard Version)

1) Basic Specifications

Model: D633‑427B (Direct Acting Servo Valve DDV)

Installation Specifications: NG6 / ISO 4401‑03

Rated Flow: 40 L/min @ Δp=35 bar (Moog Inc.)

Working Pressure:

P/A/B: 350 bar (Moog Inc.)

T Port: ≤50 bar (no Y Port, low-pressure return oil)

Frequency Response: 180–220 Hz (High Response / High Performance Level)

Step Response: ≤12 ms (0→100%) (Moog Inc.)

Sealing: NBR Nitrile Rubber (−20 to +80℃, standard temperature)

Hysteresis: <0.2%

Resolution: <0.1%

Power Supply: 24VDC (19–32V) (Moog Inc.)

Control Signal: ±10V / 4–20mA (Moog Inc.)

Feedback: Built-in LVDT Valve Core Position Closed Loop

Neutral Function: O Type (Three-Position Four-Port Fully Closed)

Weight: Approximately 3.2 kg

Electrical Interface: 6+PE Aviation Plug

2) Performance Features

Drive Method: Permanent Magnet Linear Force Motor, Direct Drive Valve Core, No Pilot Stage

Dynamic Characteristics: High Frequency Response, Fast Response, Not Affected by System Pressure, Suitable for High-Speed Closed Loop

Leakage: Low Internal Leakage, Low Power Consumption, Low Heat Generation

Anti-Pollution: No Fine Flow Throttles, Strong Anti-Pollution Capacity, High Reliability

Power Failure Safety: Spring Centering When Power Failure, Load Stopped, Safe Failure

High-Speed Closed Loop: Suitable for High Precision, High Dynamic Control of Position / Speed / Pressure, Moga China

II. Typical Application Scenarios

40L/min Medium Flow + High Response (180–220Hz)

T Port Low-Pressure Return Oil (≤50bar), No Need for Y Port

Standard Temperature Operating Conditions (−20 to +80℃), Ordinary Hydraulic Oil

High-Speed Pressurizing Machines, Precision Injection Molding, Dynamic Test Bench, Robots, Medium Flow, High Dynamic, Low-Pressure Return Oil, Standard Temperature High-Precision Closed Loop System