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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.A low temperature stop valve, Unlike Example 1, Comprises a valve body 1 and a valve cover 2, A valve stem 3 is arrange in that valve body 1, One end of the valve stem 3 is provided with a valve disc 4, The other end of the valve stem 3 is provided with an adjusting handwheel 5, A low portion of that disc 4 is provided with a guide sleeve 6, The guide sleeve 6 is fixed by means of a connecting piece and a spring pad 8, Between that disc 4 and the guide sleeve 6 is provide a valve seat 7, Between that valve stem 3 and the valve cov 2 there is provided a packing assembly 9, An O-ring 10 is further dispose at that upper portion 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, the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41, the packing assembly 9 comprises a flexible graphite packing layer, the valve body 1 is provided with a liquid inlet cavity and a liquid outlet cavity, and the two O-rings 10 are respectively arranged on the inner side and the outer side of the packing gland 11.New ways to improve skills//1751970年代初，南越敌舰不顾国际法约束，经常窜入我西沙海域骚扰，严重影响我边疆渔民海上作业。居住在西沙群岛的于化龙（唐国强 饰）一家祖祖辈辈生活在这里，一天，正在海上捕鱼的一家人遭遇闯入我领海的南越10号舰，阿爸（高保成 饰）驾渔轮和敌舰展开周旋，但最终渔轮被敌舰撞翻，全家人落入大海。幸而被我赶来的海军救起，于化龙决定报名参军，保卫祖国海防。入伍后，于化龙从一个普通水兵成长为舰长，上级命令严惩不断入侵的南越舰艇，于化龙的阿爸和妹妹（洪学敏 饰）也参加了海战。战斗中，我舰中弹受损，于化龙急令修复，并一举收复了甜水岛，击溃了登岛的敌人，敌舰长也命丧黄泉......很久以前，邪恶的肉脚丫家族依仗终极高科技武器暗物质权杖，企图利用它的力量将地球上的一切改造成冰冷的金属机械世界，从而达到统治地球的目的。为了阻止这一阴谋，神瑞家族依托光明之星的力量与之展开了一场惊心动魄的世纪之战，最终打败肉脚丫家族，将暗物质权杖控制，并且将它存放在隐秘之地。两百年后，肉脚丫后人大魔王卷土重来，解开暗物质权杖的控制，企图实现其家族的愿望！暗物质权杖即将复出，整个世界危在旦夕！神瑞家族的传人小瑞和他的伙伴们，决定前往金木水火土五国，启动控制暗物质权杖的力量——光明，重新将暗物质权杖控制。然而前路漫漫，太多的未知危险在等着他们……FX电视网在电视评论家协会的冬季新闻发布会上宣布，将瑞恩·墨菲和布拉德·法尔查克打造的《美国恐怖故事》再续订两季。去年10月份的时候，《美国恐怖故事》刚刚续订第7季，如今再续订两季，这也意味着该剧将延长至第9季。《美恐》第7季将在今年回归，而第9季的播出时间为2019年9月。同时，这次续订也并不代表《美国恐怖故事》将在第9季迎来全剧终。1) When drawing a line, when the line turns purple, it indicates that the line is parallel or perpendicular to a line in the figure, or forms an isosceles triangle with the original two straight lines.