Proper maintenance of piezoelectric jetting valves is essential to ensure their long-term stable operation, improve dispensing quality, and maintain consistency. Below are key maintenance tips:
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### **1. Daily Maintenance**
#### Regular Cleaning
- **Cleaning Frequency**: Depending on the type of adhesive and dispensing configuration, cleaning is typically performed every 2–3 days or at the end of each shift. If the adhesive tends to solidify easily, cleaning frequency should be increased.
- **Cleaning Method**: Use appropriate cleaning agents (e.g., ethanol, distilled water, n-propanol, isopropanol) compatible with the dispensing medium. Clean the valve body and all components in contact with the medium. Avoid using metal brushes or mechanical cleaning tools to prevent surface damage.
- **Disassembly Cleaning**: For deep cleaning, disassemble parts such as the nozzle, nozzle locking sleeve, and flow guide. Soak them in a container with alcohol or acetone, clean them using ultrasonic vibration, scrub with a soft brush, and dry them with an air gun.
#### Inspection and Replacement of Wearable Components
- Regularly check O-rings, seals, and other sealing components to ensure they are intact. Replace them promptly if they show signs of wear or aging.
- Follow the recommended replacement schedule in the accessory list to extend the service life of the piezoelectric valve.
#### Turn Off Air Pressure and Power Supply
- Turn off the air pressure and power supply during cleaning, maintenance, or when the valve is not in use to ensure safety.
- If the system includes heating functions for the adhesive cartridge or flow path, turn off the heating device and ensure air cooling of the valve body during shutdown to prevent overheating damage.
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### **2. Professional Maintenance**
#### Calibration and Testing
- After cleaning or disassembling the valve body and nozzle, calibrate the striker pin and nozzle pressure to ensure dispensing precision.
- Perform regular functional tests on the piezoelectric valve to confirm its opening, closing, and control performance.
#### Usage Precautions
- Avoid prolonged continuous dispensing to prevent excessive heat generation from high-speed piezoelectric stack motion, which can damage the valve body.
- Control the heating temperature to avoid softening or deformation of adhesive cartridges.
- Maintain air pressure within the recommended range to prevent overloading the adhesive cartridge, which could lead to rupture.
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### **3. Maintenance Tools and Materials**
#### Tools
- Hex keys, lint-free cloths, valve disassembly tools, ultrasonic cleaning machines, fine-tipped tweezers, cleaning swabs, brushes, etc.
#### Materials
- Lubricants, alcohol, acetone, and other cleaning agents.
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### **4. Summary**
Maintaining piezoelectric jetting valves involves multiple aspects, including regular cleaning, inspection and replacement of wearable components, turning off air pressure and power, calibration and testing, and adhering to usage precautions. Scientific maintenance practices can extend the service life of piezoelectric valves, improve dispensing quality, and ensure consistency, providing robust support for smooth production line operations.
In addition, safety practices must be observed during maintenance to ensure the safety of both personnel and equipment.