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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, 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.一天，一个叫慧嘉（杨淇 饰）的女孩出现在他们面前，这个寂寞的女孩很快喜欢上了正行，但正行心里爱着的却是另外一个人。慧嘉知道了正行心意后，跟他成为了好朋友。守恒也开始追求慧嘉，守恒却不想太早让正行知道，他觉得正行跟慧嘉都是他生命中不可或缺的人。各自怀有秘密的他们生活开始变得混乱，终于他们在海边说出了自己的秘密……《机智过人第二季》是中央电视台和中国科学院共同主办，中央电视台综合频道、中国科学院科学传播局和长江文化联合制作的原创科技挑战节目 。客轮“极光号”神秘地撞上了多岩石的大海，威胁到整个岛屿和一名年轻女子及其姐妹的生命，她们必须通过寻找失踪的尸体以获得赏金来生存，同时也面临着在家中寻求庇护的游客的危险　故事在林、甘、蓝三个家庭中展开，三家的男主人中学时期是同学，结下了深厚的友谊。故事从文革中1970年的北京开始讲起。林依被工宣队带走，被打成苏修特务，严刑逼供之下，他编织了一个极其荒唐的特务关系网，欲与造反派开一个大玩笑。林依托人带给甘沛一张纸条，希望他配合演出这场闹剧。甘沛没有来得及看完纸条，他被工宣队带走之后，不堪忍受，趁游斗的机会卧轨自杀。郑家培怨恨林依出卖朋友，林、甘两家从此反目成仇。 蓝皓、卢婕夫妇试图调解林、甘两家的矛盾，也无能为力。郑家培、陆艺波在同一日分娩，卢婕在产房中把两个孩子（甘雨、林树）偷偷掉包，她希望此举在日后可以成为化解恩怨的钥匙。芳荪在蓝皓的帮助之下发表了处女作，一鸣惊人。蓝皓为了维护芳荪，偷换编辑部存档的底稿，因此被下放，离京之前，与卢婕离婚。 林依被工宣队放出后，全家下放北大荒。郑家培携儿女下放长白山，路上女儿甘泉不慎走失。经历了与侏儒橄榄球队的对决，裸奔活动的大幕即将揭开，然而关键时刻，艾瑞克忽然领悟了爱与性的意义，做出了自己的抉择。然后，他上前走了几步，对门口脸色惊愕的少女说道：姑娘，不好意思。