As the core control component in hydraulic system, servo valve is widely used in industrial automation, aerospace, ship engineering and other fields. Its performance directly affects the control accuracy and response speed of the system. However, in the practical application process, the servo valve is often threatened by liquid and humid environment, so having good waterproof performance becomes the key to ensure its stable operation. This paper will discuss how to protect the waterproof servo valve, and introduce its protection principle, design points and daily maintenance methods.
First, the basic principle of waterproof servo valve
Waterproof servo valve is not completely airtight, but has a certain dustproof and waterproof grade (IP grade) through structural design and material selection. Common waterproof grades, such as IP65 and IP67, respectively indicate their protection against dust and water. For example, IP67 means completely dustproof and can be immersed in water in a short time without damage. Waterproof servo valves usually use sealing rings, splash shields, waterproof joints and other components to prevent liquid from infiltrating into internal coils, electromagnetic components and control circuits.
Second, the design points of waterproof servo valve
1. Shell protection design
Waterproof servo valve generally adopts metal or high-strength engineering plastic shell, and the surface is treated with anti-corrosion. High elastic sealing rubber ring is used at the joint of the shell to ensure sealing performance.
2. Electrical interface protection treatment
The electrical connection part is the weak link of waterproof, so it is usually protected by waterproof plug, sealant potting or thread sealing to prevent moisture from infiltrating along the conductor.
3. Sealing design of internal structure
A sealing isolation layer is arranged between the valve core and the electromagnetic driving part to prevent external liquid from invading the key control parts. At the same time, corrosion-resistant materials such as stainless steel or plating materials are used to enhance the water resistance of the internal structure.
4. Ventilation and drainage mechanism
On the premise of ensuring sealing, some servo valves are designed with drainage holes or pressure balance holes to prevent internal water accumulation or air pressure difference from causing sealing failure.
Third, the maintenance and protection measures of waterproof servo valve in use
1. Check the sealing performance regularly.
During use, check whether the sealing ring is aging and the interface is loose regularly, and replace the damaged parts in time.
2. Avoid extreme environmental use
Although waterproof, long-term immersion or high-pressure water jet may still cause damage. It should be avoided to use in the environment beyond the design protection level.
3. Control of installation environment
The installation site should be kept ventilated and dry to avoid condensation inside due to humid air. If necessary, it can be equipped with dehumidification device or desiccant.
4. Cleaning and maintenance
Regularly clean the dust and dirt outside the servo valve to prevent blocking the drain or affecting the heat dissipation performance.
IV. Conclusion
With the complexity of industrial environment, more and more attention has been paid to the waterproof performance of servo valves. High-quality waterproof servo valve can not only run stably in harsh environment, but also significantly improve the reliability and life of the system. However, waterproof does not mean “no fear of water”, and reasonable design, correct use and scientific maintenance are indispensable. Only by paying attention to all aspects of selection, installation and maintenance can the effectiveness of waterproof servo valve be truly exerted and the long-term stable operation of the equipment be guaranteed.