How to improve the sealing performance of butterfly valve? The sealing performance of butterfly valve can be improved from the sealing materials, structural design, manufacturing and installation, and maintenance.
1, sealing materials
Selection of high-quality sealing materials: according to the use of the butterfly valve environment (such as temperature, pressure, media, etc.), choose the appropriate high-performance sealing materials. For example, in high temperature environment, graphite, ceramics and other high temperature resistant materials can be used; For corrosive media, corrosion resistant materials such as polytetrafluoroethylene (PTFE) and fluorine rubber can be selected. These materials can maintain good sealing performance and stability under harsh working conditions.
Optimize material properties: Surface treatment of existing sealing materials or the addition of special additives to improve their wear resistance, corrosion resistance and flexibility. For example, the surface coating of rubber seals can enhance their wear resistance and chemical resistance; Adding additives such as nanoparticles to the sealing material can improve its physical properties and improve the sealing effect.
2. Structural design
Improved sealing structure: more advanced sealing structure design, such as double eccentric or triple eccentric structure. Double eccentric butterfly valve through the eccentric valve shaft and seat design, so that the valve plate in the opening and closing process, can effectively reduce the friction and wear of the sealing surface, improve the sealing performance and service life; The three-eccentric butterfly valve further optimizes the eccentric structure, has a better sealing effect, and can adapt to higher pressure and temperature requirements.
Add sealing auxiliary devices: Set sealing auxiliary devices in the butterfly valve, such as sealing gaskets, sealing rings, etc. These auxiliary devices can play an additional sealing role and enhance the overall sealing performance. For example, the installation of metal winding gaskets between the valve seat and the valve body can improve the reliability of the seal; The O-shaped sealing ring between the valve plate and the seat can effectively prevent the leakage of the medium.
3, manufacturing and installation
Improve processing accuracy: In the manufacturing process of butterfly valve, the processing accuracy of each component is strictly controlled to ensure the flatness, finish and dimensional accuracy of the sealing surface. The high precision machining can make the sealing surface better fit and reduce the leakage gap. For example, advanced CNC processing equipment and technology are used to precision machining the sealing surface of the valve seat and valve plate to improve the quality of the sealing surface.
Ensure installation quality: The correct installation of butterfly valves is the key to ensure their sealing performance. During the installation process, it is necessary to strictly follow the installation instructions to ensure that the valve is installed in the correct position, and the connection between the pipe and the valve is firm and concentric. At the same time, it is necessary to avoid causing damage to the sealing surface during the installation process, such as tightening the bolt, it is necessary to tighten evenly according to the specified torque to prevent the uneven force of the sealing surface and cause leakage.
4. Maintenance
Regular inspection and maintenance: Establish a regular butterfly valve inspection and maintenance system, and regularly test the sealing performance of the valve. Timely find the wear, aging, deformation and other problems of the sealing surface, and take corresponding repair or replacement measures. For example, regularly check the appearance of seals, if found cracks, wear or signs of aging, should be replaced in time; Clean and lubricate the sealing surface to keep it in good working condition.
Control operating parameters: During the operation of the butterfly valve, the temperature, pressure, flow and other parameters of the medium should be strictly controlled to avoid exceeding the allowable range of the design of the valve. Because too high temperature, pressure or flow may cause too much impact and damage to the sealing surface, resulting in reduced sealing performance. Through reasonable process control, to ensure that the butterfly valve operates under stable working conditions, can extend the service life of the seal, improve the sealing performance.
