Replacement measures for vacuum butterfly valve shaft packing
①As the valves in the pipe network are usually opened and closed infrequently, the packing is required to be inactive for several years, and the packing does not age, so as to maintain the sealing effect for a long time;
②The valve shaft packing should also have a good sealing effect when it is subjected to frequent opening and closing;
③In view of the above requirements, the valve shaft packing strives not to be replaced for life or more than ten years;
④ If the packing needs to be replaced, the valve design should consider measures that can be replaced under water pressure.
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