| 摘要 |
A plug valve and a sealing assembly for a plug valve. A plug valve having a plug closure member for sealing off the open end of a conduit and thereby preventing flow of a first fluid through the conduit, the plug closure member connected to a hollow stem tube, a channel for the flow of a second fluid, (a lift medium), extending through the hollow stem tube and plug closure member, the plug closure member and stem movable in a guide tube toward and away from the open end of the conduit, the plug closure member seatable in the open end of the conduit, and a sealing assembly disposed between the stem tube and guide tube for preventing the flow of fluid, fluidized catalysts, or purge medium downward past the sealing assembly and for preventing the flow of lift medium or feedstock upward past the sealing assembly. A spacer for a purge channel is provided for even distribution of a purge medium.
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