DBVSA-1LGInverse Proportional Pressure Reducing Valve
2 week ago
Product details
I. Core Functions
1. Inverse Proportional Pressure Regulation
Unlike conventional pressure-reducing valves, the DBVSA-1LG exhibits an inverse relationship between output pressure and input signals (e.g., electromagnetic or mechanical force). Specifically:
• Increased input signal→ Reduced valve port opening → Lower output pressure.
• Decreased input signal→ Expanded valve port opening → Higher output pressure.This characteristic makes it ideal for applications requiring pressure to vary inversely with control signals.
2. Dynamic Pressure Control
By continuously adjusting valve port opening, it rapidly responds to system pressure fluctuations, maintaining stable output pressure. For example, in hydraulic systems, it automatically regulates to protect downstream components from load pressure variations.
3. High Precision and Repeatability
Certain models (e.g., those from Bosch Rexroth) achieve a regulation accuracy of ±1% with high repeatability, suitable for stringent pressure control scenarios such as semiconductor manufacturing and medical equipment.
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II. Working Principle
1. Structural Components
• Main Valve: Includes a valve body, spool, spring, and sealing elements for actual pressure regulation.
• Pilot Valve: Comprises a proportional solenoid, pilot spool, and control circuit. It converts external signals into hydraulic signals to drive the main valve.
• Feedback Mechanism: Monitors output pressure via pressure sensors or mechanical feedback, forming a closed-loop control system for stability.
2. Inverse Control Logic
• When the input signal (e.g., current) increases, the proportional solenoid generates stronger magnetic force, shifting the pilot spool to reduce the main valve’s inlet flow, thereby lowering output pressure.
• Conversely, a weaker input signal allows the pilot spool to reset, increasing the main valve’s inlet flow and raising output pressure.
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III. Typical Applications
1. Hydraulic System Pressure Protection
Used in construction machinery (e.g., excavators, cranes) to limit the maximum working pressure of hydraulic cylinders or motors, preventing overload damage.
2. Precision Manufacturing and Testing
• Semiconductor Equipment: Provides stable gas or hydraulic pressure during wafer handling and chemical vapor deposition (CVD) processes, ensuring product yield.
• Medical Devices: Precisely controls gas pressure in anesthesia machines and ventilators to guarantee patient safety.
3. Industrial Automation
• Injection Molding Machines: Regulates mold clamping force to prevent damage or defects caused by excessive pressure.
• Machine Tools: Controls hydraulic fixture clamping force for diverse workpiece machining requirements.
4. New Energy Sector
• Wind Turbine Pitch Systems: Synchronously adjusts hydraulic cylinder pressures for precise blade angle control, enhancing power generation efficiency.
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IV. Technical Specifications and Selection Guidelines
1. Key Parameters
• Rated Pressure: Typically 10–35 MPa (model-dependent). Must exceed the system’s maximum operating pressure with a safety margin.
• Flow Range: Select based on actuator requirements (e.g., 10–100 L/min).
• Response Time: Fast-response models achieve ≤20 ms, suitable for dynamic systems.
• Control Signal: Supports 4–20 mA current or 0–10 V voltage signals; must match the controller.
2. Selection Recommendations
• Pressure Matching: Ensure the valve’s rated pressure ≥ system maximum pressure with a safety margin.
• Flow Requirements: Choose valve port size based on actuator flow to avoid insufficiency or excess.
• Environmental Adaptability: For outdoor or dusty environments, select high IP-rated models (e.g., IP65/IP67).
• Maintenance Convenience: Prioritize modular designs for easy seal replacement or cleaning.
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V. Installation and Maintenance
1. Installation Precautions
• Correct Orientation: Align media flow direction with the valve body arrow to prevent malfunction.
• Cleanliness Requirements: Use strict filtration (e.g., 25 μm filters) to avoid contaminants jamming the spool.
• Pressure Relief Protection: Install a relief valve downstream to prevent pressure surges from damaging gauges or other components.
2. Maintenance Schedule
• Regular Inspections: Check seals for wear every 6 months and replace hydraulic oil to maintain system cleanliness.
• Troubleshooting: Investigate pressure fluctuations or leaks by examining spool jamming, spring failure, or seal damage.
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