To prevent material from leaking along the valve stem, packing is used for sealing; the packing gland is used to compress the packing, with greater compression being preferable.
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I’d like to ask the experts here! To prevent material from leaking along the valve stem, packing is used for sealing; the packing gland is used to compress the packing, with greater compression being preferable. What’s wrong with this sentence?
The mistake is thinking that \"the tighter, the better\" – when it’s too tight, the valve stem can’t rotate
According to the principle of this type of packing, assuming that the volume inside the packing box remains constant. When axial pressure is applied, the filler is compressed and converts into a radial force, which serves to provide sealing. If too much force is applied, it can lock the valve stem and prevent it from rotating, thereby making it impossible to open or close the valve. So moderation, without any leaks, is the best approach. For some valves that experience large temperature differences, it is necessary to loosen the packing gland during operation, and after operation, it must be secured to prevent leaks. For reference.
Thank you for your answer! Thank you for the advice!
Thank you for your answer! Thank you for the advice!
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