H633 Direct-Drive Servo Valve
Product Overview
H633 is a direct-drive electro-hydraulic servo valve (DDV) driven by permanent magnet linear force motor, equipped with LVDT spool position electrical closed-loop feedback. The built-in digital drive circuit integrates spool closed-loop control, command signal processing and PWM drive modules. It requires no pilot oil supply. Multiple spool functions including 3-way, 4-way and 2×2-way can be customized. This series serves as a domestic alternative solution for imported direct-drive servo valves.
H633 Direct-Drive Servo Valve is a high-response energy-saving Hydraulic valve, which serves as the core control unit of advanced precision hydraulic system. This compact Hydraulic valve cancels traditional pilot stage and uses direct-drive driving architecture. It converts electrical control signals directly into spool displacement to adjust hydraulic flow, realizing high-precision closed-loop motion control for modern industrial Machine. Installed in the hydraulic system, H633 Direct-Drive Servo Valve effectively optimizes response performance and enhances control stability of precision automated Machine.
Key Technical Specifications
- Rated flow: 5 / 10 / 20 / 40 L/min
- Maximum working pressure: 350 bar
- Frequency response: ≥120 Hz
- Hysteresis: ＜0.3%
- Step response time: ≤12 ms
- Internal leakage: ＜1.5 L/min
- Operating temperature: -20℃ ~ +85℃
- Supply voltage: 24 VDC
Main Advantages
1. Direct drive design, independent dynamic performance from supply pressure
2. No pilot oil circuit needed, simplified hydraulic system layout
3. Ultra-low hysteresis, excellent resolution and stable static control accuracy
4. Low power consumption at hydraulic null position
5. Digital driving circuit, strong anti-interference performance, adjustable control parameters
6. Built-in LVDT sensor for real-time spool position monitoring, convenient for system fault diagnosis
7. Strong contamination resistance compared with traditional two-stage nozzle-flapper servo valves
8. Support electrical zero adjustment on site
Working Principle
The analog or digital command signal is transmitted to the built-in controller. The controller compares target signal with actual spool position signal fed back by LVDT, outputs drive current to linear force motor. The motor directly pushes the valve spool to adjust flow direction and flow rate, realizing precise closed-loop control of position, velocity, force or pressure of hydraulic actuators.
Typical Applications
- Metallurgical equipment: rolling mill, strip steering system
- Material test benches & hydraulic test systems
- Precision hydraulic presses and forming machinery
- Energy industry: turbine hydraulic control system
- Industrial robot hydraulic drive modules
- Aerospace simulation test platforms
- High-precision automation closed-loop control systems
