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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, A valve seat 7 is arranged between the valve disc 4 and the guide sleeve 6, a packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, an 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 41.1950年，除川西外，整个中国大陆地区已全部解放。在解放在大军向西昌进发之际，蒋介石命令胡宗南死守川西，等待国际时局的变化。于是，川西第一天险——天蒙山，便成了国共两军的必争之地。Messages forwarded by this machine: PREROUTING--> FORWARD--> POSTROUTING　　1843年，君主专制下的欧洲饥荒肆虐、经济萧条，处处危机四伏。英国的工业革命改变了世界秩序，创造出新的无产阶级。秉持博爱共产理念，工人组织陆续成立。两名德国青年，马克思与恩格斯，将颠覆这些组织的乌托邦思想，改造他们的斗争及全世界的未来。大型航天题材电视剧该剧讲述了智商高但情商0的计算机工科专业边缘人秋尚宇与高颜值的设计科明星张宰英以开发者和设计者的身份相遇后发生的有意思的校园爱情故事。江湖上独家迷香门派的唯一传人叶晓聪为了寻找制造起死回生香的核心秘方龙涎香，乔装丫鬟深入平远侯府，与平远侯白杖书相识却被误认为是北国间谍，从此两人在不断的嬉笑误会中成为了一对欢喜冤家，吵吵闹闹中又共同面对了人生的诸多难题，最终成为有情人。