根据本发明，用于在空气引导通道的第一和第二部分之间提供密封的所有密封唇形成在外部接头件上并且至少部分地包围内部接头件的外表面。
All sealed lips provided between the first and second parts of the air guide chunnel forms on the exterior joint member and encloses exterior surface of the inner joint member at least partly.
阀杆密封填料可采用唇形结构，密封可靠、操作力矩小。
Valve rod seal packing can adopt lip shape structure, seal up dependable, Operates moment of force small.
阀杆密封填料可采用唇形结构，密封可靠、操作力矩小。
Valve rod seal packing can adopt lip shape structure, seal up dependable, Operates moment of force small.
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