Sanitary Diaphragm Valve Valve shaft packing:

1. Since pneumatic valves in pipe networks are usually opened and closed infrequently, the packing is required to be inactive for several years and not aged, so as to maintain the sealing effect for a long time;

2. Valve shaft packing should also have good sealing effect when subjected to frequent opening and closing;

3. In view of the above requirements, valve shaft packing should not be replaced for life or for more than ten years;

4. If the packing of sanitary diaphragm valve needs to be replaced, the design of pneumatic valve should consider measures to replace it under water pressure.