Product Description

I. Core Parameters (D633-442B-RO2KO1FONSS2 Official Standard)

1. Basic Specifications

Model: D633-442B-RO2KO1FONSS2 (NG6 Direct Acting Servo Valve)

Flow Specification: 40 L/min @ Δp=35 bar

Pressure Rating:

P/A/B: 350 bar

T/Y: 350 bar (with Y port high-pressure return oil)

Frequency Response: 320–380 Hz (−3dB)

Step Response: ≤6 ms (0→100%)

Leakage: <0.3 L/min (neutral position)

Valve Core Type: Standard zero coverage, linear gain (R)

Neutral Function: O type (fully closed, O)

Sealing Material: NBR (−20 to +80°C)

Weight: Approximately 3.2 kg

Installation Standard: NG6 / ISO 4401-03

2. Electrical Parameters (Suffix Customization)

Power Supply: 24VDC (18–32V), V

Control Signal: ±10V Analog Voltage, K

Feedback: Built-in LVDT valve core position closed-loop, 1

Interface: 6+PE Aviation Plug, 02

Hysteresis: <0.2%

Resolution: <0.1%

Electronic Board: Integrated PWM Drive, Closed-loop Control

3. Model Segmentation Analysis (RO2KO1FONSS2)

R: Standard Valve Core (Zero Coverage)

O2: 6+PE Aviation Plug (O = Circular Connector)

K: ±10V Control Signal

O: O-type Neutral (Fully Closed)

1: Built-in LVDT Position Feedback

F: FKM Fluororubber High Temperature Seal (−20 to +150°C)

O: Standard Gain, No Offset

N: Low Pressure Return Oil (T port ≤ 210 bar)

SS: Standard Valve Body Coating

2: Version Number (Latest Standard Configuration)

4. Panel and Identification

Valve Body: MOOG Label, Model, Serial Number, Pressure Marking

Electrical Connectors: 6+PE Pin Definitions (Power, Command, Feedback)

5. 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, high repeat positioning, low hysteresis

High Temperature Seal: FKM Fluororubber, suitable for high-temperature hydraulic oil conditions

Power-off Safety: Spring centering, load stop

II. Typical Application Scenarios

High-speed Precision Press Machines, High-frequency Dynamic Test Bases

High-speed Robot Joints, Flight / Motion Simulator

High-temperature conditions (+120 to +150°C) Hydraulic Systems

High Precision Closed-loop Control of Position / Speed / Pressure

Ordinary Pressure Return Oil (Non-high-pressure accumulator circuit)