I. Core Parameters (Official Standard Version)

1) Basic Specifications

Model: D633‑399B (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: 150–180 Hz (High Response, Second Only to 375B)

Step Response: <15 ms (0→100%)

Sealing: NBR (−20～+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: High Frequency Stability, Fast Response, Balances Speed and Reliability

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

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

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

II. Typical Application Scenarios

75L/min High Flow + High Response (150–180Hz)

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

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

High-speed Pressing Machines, Precision Injection Molding, Dynamic Test Bench, High-speed Rolling Gap in Metallurgy, High-speed System that Requires Both Speed and Stability, High-end Closed Loop System