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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.　　霍、赵两家一年一度比赛争取“正宗”头衔“大校”的日子到了，双方斗得难分难解，中途横出一独臂老人程天笑，原来他是霍恩第、赵声显的大师兄，此次偕徒弟陈真回来搅局，危急之际，霍元甲猝然出手，把程天笑打走。"No" (ancient prose) "" Zheng "cut and entered. Otherwise, it is impossible and not. As for the burial of "Ceng Zi", there is food every day, and there is no food. And "Zhou Xia Guan" did not take the surname, and his palm was fierce and he taught it. "" Those who are not satisfied with the service. And "" "" cut into things. Fortune. Today's sound is the same. And "" Fu Jiu cut, sound fou. Can it be passed? [Wen] Xiang, not down also. From a day to a day. Pictographic. And "Yu Pian" just cut "," just rescue cut, fou go. Same as. "Fu Qi" Ji "and" Zheng "Fang Qi, Yin Fu. No, also. Also called. "Ya" Qi. "Shu" said: Today it is small. One is from Youzhou or Liang Songxian.汪魁粗声粗气地说道：那是。只是你我素未谋面，无冤无仇，何苦帮着徐阶搞死自己？这都不重要了。When I got home, my socks were not like what I was doing. I asked the weak one, boss, can I have another pair?