How precise can piezoelectric valves be? - A deep dive into the technical characteristics of piezoelectric valves.
Release time:
2025-02-20 09:04
Source:
Leica Technology
**How accurate can a piezoelectric valve be? - A deep dive into the technical characteristics of piezoelectric valves**
In modern industrial and technological fields, the precision and reliability of fluid control systems are crucial. Piezoelectric valves, as an advanced valve controller, are widely used in various fluid control systems due to their high precision, fast response, and energy-saving environmental features. This article will explore the technical characteristics of piezoelectric valves, particularly their precision performance, to help readers better understand and choose this high-performance valve controller.
### 1. Basic Principles and Structure of Piezoelectric Valves
A piezoelectric valve is a valve controller that works using the piezoelectric effect. The piezoelectric effect refers to the phenomenon where certain crystals generate electric charges when subjected to external forces, and conversely, these crystals deform when a voltage is applied. Piezoelectric valves utilize this principle to control the opening and closing of the valve by applying voltage, thereby achieving precise control of fluid flow.
Piezoelectric valves typically consist of piezoelectric ceramic sheets, valve bodies, valve cores, and driving circuits. The piezoelectric ceramic sheet is the core component of the piezoelectric valve, capable of converting electrical energy into mechanical energy to drive the valve core's movement, thus changing the valve's opening. The valve body and valve core form the channel for the fluid, regulating the fluid flow through the movement of the valve core. The driving circuit is responsible for providing the appropriate voltage signal to the piezoelectric ceramic sheet to achieve precise control of the valve.
### 2. Precision Performance of Piezoelectric Valves
Piezoelectric valves are known for their high precision, capable of achieving micrometer-level control of valve opening and closing. This feature gives piezoelectric valves a significant advantage in situations requiring precise flow control. For example, in high-precision chemical analyzers, piezoelectric valves can accurately control the amount of reagent added, achieving accurate analysis.
The precision of piezoelectric valves is typically assessed through flow control resolution. Flow control resolution refers to the minimum flow change that the valve can stably control. The higher the resolution, the stronger the valve's control capability over the flow, and the higher the precision. Some high-performance piezoelectric valves can achieve flow control resolutions at the micrometer level or even higher, fully meeting the demands for high-precision fluid control.
### 3. Other Technical Characteristics of Piezoelectric Valves
In addition to high precision, piezoelectric valves also possess many other noteworthy technical characteristics:
1. **Fast Response**: The response time of piezoelectric valves is typically in the millisecond or even microsecond range, allowing them to complete valve opening and closing actions in a very short time, meeting the needs of high-speed fluid control.
2. **Energy-saving and Environmentally Friendly**: Piezoelectric valves do not require large amounts of energy during operation, and they do not produce mechanical wear or noise pollution, aligning with modern industrial requirements for energy conservation and environmental protection.
3. **Long Lifespan and Stability**: Since piezoelectric valves do not have mechanical connections or easily damaged components like servo motors, they have a longer lifespan and stable, reliable performance.
4. **Compact Size**: Piezoelectric valves are typically small in size, making them easy to install and maintain, suitable for spaces with limited room.
5. **Easy Remote Control**: Piezoelectric valves can be remotely controlled through driving circuits, facilitating automation and intelligent control.
### 4. How to Choose the Right Piezoelectric Valve
When selecting a piezoelectric valve, it is essential to consider the following factors based on the specific application scenario and requirements:
1. **Flow Range**: Clearly define the required fluid flow range for the application scenario and choose a piezoelectric valve that can meet the minimum and maximum flow requirements.
2. **Flow Control Precision**: Choose a piezoelectric valve with appropriate flow control precision based on the requirements for flow accuracy. Generally, this can be assessed by checking the flow control resolution in the product manual.
3. **Working Pressure**: Consider the working pressure requirements of the application scenario and select a piezoelectric valve that can withstand the corresponding pressure.
4. **Fast Response Requirements:**
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How can daily maintenance help extend the service life of a valve body?
As a precision component that operates at high frequency, the precision dispensing valve requires scientific daily maintenance to extend its service life and maintain dispensing accuracy. Shenzhen Laike Technology has compiled the following key maintenance points for you: Daily cleaning is crucial and should not be overlooked. After finishing work, promptly remove any residual adhesive from the exterior of the valve body, especially around the nozzle and plunger area. Once cured, adhesive can cause blockages or wear, affecting subsequent use. It is recommended to gently wipe with a suitable cleaning solvent, taking care not to damage the seals. Regularly inspect sealing components—seals and other parts will naturally degrade over time during prolonged operation. We recommend checking their condition periodically based on usage frequency. If you notice signs of hardening or wear, replace these components promptly to prevent adhesive from seeping into the valve body and causing more serious damage.
The stringing issue during the dispensing process is often closely related to fluid properties, equipment parameters, and process settings. Drawing on years of industry experience, SZLKTE has compiled and optimized key points for you: Fluid temperature control is crucial. Proper heating can reduce the viscosity of the adhesive, improve its flowability, and minimize stringing and trailing. SZLKTE’s dispensing valves can be equipped with precision temperature-control modules to ensure that the fluid remains in a consistently stable working state. The back-suction parameters must be finely adjusted. The negative-pressure back-suction applied at the moment the glue dispensing stops can effectively cut off the adhesive flow, preventing dripping and stringing. We recommend gradually adjusting the amount and speed of back-suction according to the adhesive’s viscosity until you find the ideal balance.
SZLKTE takes a multi-dimensional approach to ensure zero errors and long service life for its products even under high-speed, continuous operation. The piezoelectric valve series employs piezoceramic actuation technology; its non-contact drive design eliminates mechanical wear common in traditional solenoid valves, enabling a service life of over one billion cycles. At the same time, these valves deliver millisecond-level response times, completely eliminating trailing and stringing issues. The needle valve KC-9870, on the other hand, features a specially engineered, wear-resistant material for its needle component, offering exceptional resistance to abrasion and corrosion. Even in industrial environments with prolonged operation, this valve maintains outstanding stability. Moreover, its components can be quickly disassembled and maintained, significantly reducing production downtime.
Contact Dispensing vs. Non-Contact Jetting Valves: How Should You Choose for Micron-Level Processes?
Contact dispensing involves the needle making physical contact with the substrate surface to apply the fluid. Its main advantage lies in its strong adaptability to high-viscosity fluids and relatively controllable dispensing process. However, since it requires coordinated movement along the Z-axis, the dispensing speed is limited. Additionally, there is a risk of the needle colliding with and damaging the workpiece or deforming the needle itself. Therefore, careful evaluation is necessary when applying this method in miniaturized packaging scenarios. In contrast, non-contact jetting valves use a driving mechanism to rapidly spray adhesive onto the workpiece surface without any physical contact between the needle and the substrate. This feature makes them ideally suited for substrates with uneven surfaces or those that are fragile. They excel in micron-scale processes such as bottom-fill applications for chips and precision coating. The jetting method eliminates the need for Z-axis movement, significantly boosting production efficiency while also avoiding common issues associated with contact dispensing, such as stringing and trailing.
The stability of the piezoelectric valve dispensing process directly determines product quality. Common issues such as uneven dispensing, stringing, and glue leakage can be effectively addressed through parameter adjustments and optimized matching. Laike’s piezoelectric valves support multi-level parameter adjustments, enabling precise matching of pressure, injection frequency, and nozzle aperture according to the specific characteristics of different fluids.
Blocking the hole is Piezoelectric valve The most common failures in dispensing operations are often caused by fluid solidification, residual impurities, and nozzle wear, which directly affect dispensing accuracy and efficiency. Given the structural characteristics of piezoelectric valves, these issues can be addressed in three steps: “diagnosis—cleaning—inspection.” First, stop the machine and visually inspect the nozzle for obvious glue deposits or foreign objects, determining whether the blockage is temporary or a persistent issue caused by nozzle wear.
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