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3.10A 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, An upper part of that O-ring 10 is provide 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, the two O-rings 10 are concentric arranged, and the inner diameter and outer diameter of the two O-rings are different.一九九二年春天，在大青山市第七牛奶厂濒临倒闭之际，王中天经深思熟虑，辞去工作，以团队名义承包了牛奶七厂。企业初期困难重重，王中天决定邀请莎琳娜加入团队，两人强强联手推翻了原厂长刘永德为首的保守势力，使企业步入正轨，成为全国知名上市公司“天潢集团”。期间，王中天妻子的去世，使莎琳娜重新燃起对王中天的爱意，但他担心这会影响两人合作伙伴的关系，他拒绝了莎琳娜，匆匆与厂医张玲结为夫妻，这让莎琳娜深受打击。事业越做越大，然而，王中天对企业的管理不当和三聚氰胺事件等原因使天潢集团再次陷入谷底。莎琳娜另创大地集团与其竞争。此时的王中天经过长时间的沉淀与思考，终于对人生与事业的发展有了更深刻的认识。他主动找到莎琳娜提出两家企业捐弃前嫌，终于再度合作，向着打造世界级的奶制品品牌的目标进发。一架从洛杉矶飞往巴黎的747航班上，搭载了几名不速之客。他们是来自美国军方的科学家，现在正计划带着一具尸体逃离美国。此前，他们在CIA的授意下对疟疾病毒进行研究，旨在开发出适合战争需要的生化武器，最终他们一种神奇的病毒应运而生。被该病毒感染的人其生命力、爆发力以及意志都空前增强，与之相对疼痛感和恐惧心理则降至最低，即使身负重伤他们也能勇往直前，决不退缩。科学家们所带的尸体正携带这种恐怖的病毒。Fox宣布续订《紧急呼救》第四季。截至目前，《紧急呼救》第三季为Fox台本季度观看人数最多的剧集。想到沛公刘邦还置身其中，不由的急的满头大汗。