| 摘要 |
A seal (7) for sealing a movable member from a chamber containing a fluid includes a tube having various shapes. The seal is configured to seat in a gland around a movable member. In beneficial embodiments the seal has a tapered shape so that the top portion does not fill the entire gland. The seal can be made of compressed graphite ribbon that has a greater density at the top than the bottom. A die for making the seal in the tapered shape and with a decreasing density gradient is described. A method for making the seal with a die is also described.
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