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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, The O-ring 10 is further arranged at 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, 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, and the valve body 1 is provided with a liquid inlet cavity and a liquid outlet cavity.40集电视连续剧《大境门》以张家口作为我国对外贸易“陆路商埠”的史实为背景，讲述了民国初年张家口巨商王瑞昌在张库大道(起于张家口，终于库伦，即今乌兰巴托)上的经商奋斗的故事，再现了动荡时局下的这条中国北方唯一的进出口贸易陆路通道的兴衰……该电视剧将于2009年播出，为建国60周年献礼。1. Tcp connection flood attack故事讲述从小是好朋友的四人：枫、薰、ミチル、えみ，在えみ的婚礼上重遇。那天枫工作的公司突然倒闭，被男友甩了，在30岁事业爱情双失。枫决心要实现儿时当面包师傅的梦想。虽然后来在面包店得到了工作，但是枫遇到了很多职场困难。在高级美容店工作的薰、极贫的包包手艺人ミチル和新婚生活的えみ，四人生活会出现好多的变化。四人在恋爱、工作和生活中如何成长，四人的明天会是晴天，还是阴天？4. Detecting SYN Attacks虽说熊心才受形势所迫，项羽不经意间已经将他和宋义一起恨上了，多年后痛下杀手的决心，未尝不是始于今日。