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Question:

What is valve packing used for?

Where is it installed, what is the role, what is the material, and are there other alternatives instead of this effect?

Answer:

Valve packing in the valve under the gland to prevent leakage, you can use ordinary asbestos rope and butter emergency replacement
Main stem to prevent leakage, there are PTFE and graphite and so on. There are no other good products to replace.
Mainly from the role of sealing, to prevent leakage of the valve conveying medium, stuffing commonly used PTFE, graphite, asbestos packing three.

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