How to solve the easy wear and tear of the packing of the fluorine-lined butterfly valve
? In the actual use of the fluorine-lined butterfly valve, its packing is prone to wear, so what is the reason for this? What is the solution? Let's take a look at it together. In the design or use experience of fluorine-lined valves, the packing of lift valves is generally asbestos packing or graphite packing or PTFE V-type packing, but these kinds of packing are limited by the number of valve opening and closing, but with the number of valve opening and closing With the increase of the valve, the packing will wear and the gap will gradually increase. After a certain number of times (not more than 2000 times according to statistics), the valve will leak from the packing. After the leakage, the packing gland needs to be re-compressed. This scheme is suitable for Occasions where the number of valve opening and closing times is small. If the valve is opened and closed frequently, (such as 100,000 to 300,000 times a year), it will undoubtedly increase the use and maintenance costs of the valve. We can add a washer under the packing and a spring under the washer (the preload of the spring needs to be calculated). When the packing is worn out, due to the action of the spring, the packing will be re-compressed to make it sealed. At present, this method can only reach 500,000-1,000,000 times of opening and closing without leakage. The user needs to re-compress 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 valve design idea, use the oil cylinder to seal the slip ring at the packing, and increase the O-ring seal (the friction force and the specific pressure of the seal need to be calculated to determine the slip ring and O type seals). After reading the above content, I believe that everyone already knows the solution to the easy wear and tear of the packing of the fluorine-lined butterfly valve.
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