I. Core Parameters (D633-455B Official Standard)

1. Basic Specifications

Model: D633-455B (NG6 Direct Acting Servo Valve)

Flow Specification: 10 L/min @ Δp=35 bar

Pressure Rating:

P/A/B: 350 bar

T/Y: 50 bar (standard low-pressure return oil)

Frequency Response: 180–220 Hz (−3dB)

Step Response: ≤12 ms (0→100%)

Leakage: <0.2 L/min (neutral position)

Valve Core Type: Standard zero coverage, linear gain

Neutral Function: O-type (fully closed)

Sealing Material: FPM Fluororubber (−20 to +80℃)

Weight: Approximately 2.8 kg

Installation Standard: NG6 / ISO 4401-03

2. Electrical Parameters (Standard Configuration)

Power Supply: 24VDC (18–32V)

Control Signal: ±10V / ±10mA / 4–20mA (optional)

Feedback: Built-in LVDT valve core position closed-loop (EFB electronic feedback)

Interface: 6+PE Circular Aviation Plug (DIN 43650)

Hysteresis: <0.1% FS

Resolution: <0.1%

Linearity: ±0.25% FS

Electronic Board: Integrated PWM drive, closed-loop control

3. Model Meaning (455B)

4: D633 Series, 24VDC, Integrated Electronics

55: Flow Specification Code (10 L/min)

B: Standard Version, Low-pressure Return Oil, FPM Sealing

4. Key Features

Direct Drive without Pilot: Strong anti-pollution, no pilot leakage, high reliability

Linear Force Motor: Bidirectional large thrust, dynamic and pressure independent

LVDT Closed Loop: High precision, low hysteresis, high repeatability

Low-pressure Return Oil: T port ≤ 50 bar, suitable for ordinary return oil circuits

Power-off Safety: Spring centering, load stop

High Cost-effectiveness: Optimal cost for small flow scenarios

II. Typical Application Scenarios

Precision Small Pressing Machines, Material Testing Machines, Servo Actuators

Small-flow Control Axes for Injection Molding Machines, Die-Casting Machines, Hydraulic Machines

Electro-hydraulic Position/Speed/Pressure Closed-loop Control System

Industrial Automation, Metallurgy, Plastic Machinery Auxiliary Control

General Temperature Conditions (−20 to +80℃), Standard Mineral Hydraulic Oil