I. Basic Structure and Working Principle
TheDLHZO-TES Direct-Acting Servo Proportional Valvefeatures a valve sleeve design, comprising core components such as a high-response proportional solenoid, valve body, valve sleeve, spool, position sensor (e.g., LVDT), and an integrated digital amplifier. Its operation is based on electro-hydraulic proportional control technology. The proportional solenoid directly drives the spool movement, while the position sensor continuously monitors spool displacement and feeds the signal back to the digital amplifier, forming a closed-loop control system. This design eliminates the hydraulic amplification stage found in traditional servo valves, simplifying the system structure while ensuring control precision through electronic feedback.
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II. Key Performance Parameters
1. Flow and Pressure Range
• Maximum Flow: 70 l/min (size 06) to 160 l/min (size 10)
• Maximum Operating Pressure: 350 bar (DLHZO series) or 315 bar (DLKZOR series)
• Single-Side Valve Port Pressure Drop: 3.5 MPa
2. Dynamic Response Characteristics
• Response Time: ≤20 ms (0–100% step signal)
• Frequency Bandwidth: -3 dB at 40 Hz
• Hysteresis: <0.1%
• Repeatability: ±0.1%
3. Environmental Adaptability
• Operating Temperature Range: -20°C to +80°C
• Protection Class: IP65 (dust- and water-resistant)
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III. Functional Features
1. High-Precision Closed-Loop Control
Integrates an LVDT position sensor and digital amplifier for real-time spool position feedback and precise adjustment, suitable for closed-loop control of position, velocity, pressure, and other parameters.
2. Strong Contamination Resistance
The zero-overlap design between the spool and sleeve reduces internal leakage, while lower oil cleanliness requirements compared to traditional servo valves extend maintenance intervals.
3. Energy Efficiency and Reliability
• Direct-acting structure eliminates pilot-stage flow losses, reducing energy consumption.
• Built-in power-failure protection ensures the spool automatically returns to neutral upon power loss, ensuring system safety.
• Shock-resistant design adapts to harsh conditions, while the valve sleeve structure enhances adjustment precision and response sensitivity.
4. Flexible Configuration Options
• Supports analog/digital interfaces (e.g., USB, CANopen, PROFIBUS DP, EtherCAT) for fieldbus communication.
• Optional modules for P/Q composite control, pressure/force control, and load sensor feedback.
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IV. Typical Applications
1. Metallurgical Equipment: Hydraulic synchronization control, position control for continuous casting machine straightening machines.
2. Injection Molding Machinery: Speed and pressure regulation for mold opening/closing, improving product molding quality.
3. Servo Cylinder Control: Paired with digital controllers for high-precision motion control, such as in machine tool feed systems.
4. Testing Equipment: Material testing machines, structural fatigue test benches, and other scenarios requiring dynamic load control.
