I. Core Parameters (Official Standard Version)

1) Basic Specifications

Model: D633-375B (Direct Acting Servo Valve DDV)

Installation Specifications: NG6 / ISO 4401-03

Flow Rate: 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: 180–220 Hz (Ultra-High Response)

Step Response: < 12 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

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, Not Affected by System Pressure

Leakage: Low Internal Leakage, Low Power Consumption

Anti-Pollution: No Fine Orifice, Strong Anti-Pollution Capacity

Power Failure Safety: Spring Centered When Power Failure, Load Stops

II. Typical Applications

75 L/min High Flow Rate + Ultra-High Dynamic Response (180–220Hz)

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

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

High-Speed Vibration Bench, High-Frequency Dynamic Testing, High-Speed Closed-Loop System, Pursuing Extreme Frequency Response + High Flow Rate with Low Return Pressure Conditions