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A packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, the O-ring 10 is further arranged on the upper part of the packing assembly 9, the upper part of the O-ring 10 is provided with a packing gland 11, the valve body 1 is provided with an arc-shaped end face 12, the arc-shaped end face 12 forms a line seal between the valve body 1 and the valve seat 7, and the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41. The arcuate end face 12 forms a line seal between the sealing surface of the valve body 1 and the valve seat 7. The water grain 41 can ensure the sealing performance of the valve seat 7 and the valve disc 4.　　Noah Schnapp饰演Will，一个幼弱敏感的男生，他似乎不符合在80年代的「普通」定义；也就是他凭空消失了。要提前出动么？徐文长皱眉道，距离还是太远了啊……远处，麦迪那面露笑容：果然是无知。With the in-depth interrogation of Jia Hongwei, the truth of a major robbery and massacre at sea that shocked the world was finally revealed in front of everyone's eyes.A. Men: singles, doubles本剧讲述了1949年3月 毛主席带领中共中央进驻北京香山 完成解放全中国 筹建新中国的进程 搭建起新中国的四梁八柱 于1949年10月1日 向全世界宣布中华人民共和国成立的伟大故事