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阀门作为一种通用机械产品，在国民经济各行各业中都有着非常广泛的应用。填料密封一直是阀杆密封控制阀门外漏的一种重要形式。虽然填料密封这种形式非常古老，且结构也非常简单，２０年前就有人在文章中介绍它已经落后，即将被淘汰，但截止到目前，仍有９０％的阀杆采取这种
Valve as a general machinery products in all sectors of the national economy has a very wide range of applications. Packing seal has always been an important form of stem seal control valve leakage. Although packing is an ancient form of construction and its construction is simple, some 20 years ago it was reported that it was outdated and would be phased out, but as of now, 90% of the stems