I. Core Parameters (Official Standard Version)

1) Basic Specifications

Model: D633‑442B (Direct Acting Servo Valve DDV)

Installation Specifications: NG6 / ISO 4401‑03

Rated Flow: 40 L/min @ Δp=35 bar

Working Pressure:

P/A/B: 350 bar

T Port: 350 bar (with Y Port, high-pressure return oil) Moog Inc.

Frequency Response: 320–380 Hz (Topmost Ultra-High Response / Highest Dynamic Level)

Step Response: ≤6 ms (0→100%)

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

Hysteresis: <0.2%

Resolution: <0.1%

Power Supply: 24VDC (18–32V) 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 Moog Inc.

2) Performance Features

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

Dynamic Characteristics: Highest Frequency Response, Extremely Fast Response, Not Affected by System Pressure, Topmost 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-Pressure Return Oil: T Port Can Withstand 350bar, Suitable for High-Pressure Return Oil / Accumulator Circuits Moog Inc.

Limit Dynamic: Suitable for Ultra-High Speed, Ultra-High Frequency, High Precision Closed Loop Control

II. Typical Application Scenarios

40L/min Medium Flow + Topmost Ultra-High Response (320–380Hz)

T Port High-Pressure Return Oil (350bar), Need Y Port Moog Inc.

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

Ultra-High Speed Precision Press Machine, High-Frequency Dynamic Test Bench, High-Speed Robot, Medium Flow, Limit Dynamic, High-Pressure Return Oil, Standard Temperature Topmost High-Precision Closed Loop System