How To Solve The Problem Of Easy Wear Of Packing In Wafer-type Fluorine-lined Butterfly Valve?

Lined Butterfly Valve In actual use, its packing is very easy to wear. What is the reason for this? What is the solution? Let's learn about it together.
In the design or use experience of fluorine-lined valves such as wafer-type fluorine-lined butterfly valves, the packing of lifting valves is generally asbestos packing or graphite packing or polytetrafluoroethylene V-type packing, but these packings are limited by the number of times the valve is opened and closed. However, as the number of times the valve is opened and closed increases, the packing will wear and the gap will gradually increase. After a certain number of times (according to statistics, it will not exceed 2,000 times), the valve will leak from the packing. After the leakage, the packing gland needs to be re-tightened. This solution is suitable for occasions where the valve is opened and closed a few times.

If the valve is opened and closed frequently (such as 100,000 to 300,000 times a year), this will undoubtedly increase the use and maintenance costs of the valve. We can add a gasket under the packing and a spring under the gasket (the preload of the spring needs to be calculated). When the packing is worn, due to the action of the spring, the packing will be re-tightened to make it sealed. This method can only achieve 500,000 to 1 million times of opening and closing without leakage through use inspection. The user needs to re-tighten the packing gland during the annual overhaul, which can only reduce the usual maintenance.
Another way is to use hydraulic and pneumatic sealing technology, change the original design concept of the wafer-type fluorine-lined butterfly valve, use cylinder sealing slide rings at the packing, and add O-rings (friction and sealing pressure ratio need to be calculated to determine the number of slide rings and O-rings).
After reading the above content, I believe everyone already knows the solution to the easy wear of the packing of the wafer-type fluorine-lined butterfly valve.