How to solve the problem of easy wear of the packing of the clamp type fluorine lined butterfly valve?

clamp-on Fluorine-lined Butterfly Valve In practical use, its packing is prone to wear and tear. So what is the reason for this? What is the solution? Let's learn about it together below.
    Clamp type fluorine lined butterfly valve In the design or use experience of fluorine lined valves, the packing for lift valves is generally asbestos packing, graphite packing, or polytetrafluoroethylene V-type packing. However, these types of packing are limited by the number of valve opening and closing times. As the number of valve opening and closing times increases, the packing will wear out and the gap will gradually increase. After a certain number of times (according to statistics, it will not exceed 2000 times), the valve will leak from the packing. After the leakage, the packing cover needs to be re tightened. This solution is suitable for situations where the valve opening and closing times are not many.

If the valve is opened and closed frequently (such as 100000 to 300000 times a year), it undoubtedly increases the cost of using and maintaining the valve. We can add a washer under the packing and a spring under the washer (the pre tension force of the spring needs to be calculated). When the packing wears out, the spring will re press the packing to seal it. At present, this method can only achieve no leakage after opening and closing 500000 to 1 million times through usage inspection. The user needs to re tighten the packing gland during annual major repairs, which can only reduce regular maintenance.
There is another way, which is to use hydraulic and pneumatic sealing technology, change the original design concept of the clamp type fluorine lined butterfly valve, use oil cylinder sealing slip rings at the packing, and add O-ring seals (friction force and sealing pressure need to be calculated to determine the number of slip rings and O-ring seals).
After reading the above content, I believe everyone already knows the solution to the wear and tear of the packing of the clamp type fluorine lined butterfly valve.