I. Core Parameters (Official Standard Version)

1) Basic Specifications

Model: D633-380B (Direct Acting Servo Valve DDV)

Installation Specifications: NG6 / ISO 4401-03

Rated Flow: 75 L/min @ Δp = 35 bar

Working Pressure:

P/A/B: 350 bar

T Port: ≤ 50 bar (No Y Port, Low Pressure Return Oil)

Frequency Response: 80–120 Hz (Standard Industrial Grade)

Step Response: < 20 ms (0→100%)

Sealing: NBR (−20 to +80℃)

Hysteresis: < 0.2%

Resolution: < 0.1%

Power Supply: 24VDC (18–32V)

Control Signal: ±10V / 4–20mA

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: Stable Frequency Response, Not Affected by System Pressure, Strong General Compatibility

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

Anti-Contamination: No Fine Flow Orifices, Strong Anti-Contamination Capacity, High Reliability

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

II. Typical Application Scenarios

75L/min High Flow Rate + Standard Response (80–120Hz)

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

Normal Temperature (−20 to +80℃), Ordinary Hydraulic Oil

Industrial Pressurized Machines, Injection Molding Machines, Die-Casting Machines, Rolling Gap Control in Metallurgy, General High-Speed Closed Loop System, Pursuing Stability and Reliability + Standard Working Conditions with High Flow Rate