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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.那衙役恭敬地弯腰答道：是。清末民初，北方千年酿酒重镇尽善村有几百家酿酒作坊，其中史、卫、霍三家成鼎足之势。史家宝泉益的“老白清酒”被朝廷点为贡酒，高兴之时作坊却遭蹊跷大火。大掌柜肖子富和史家小姐史纨清“借”来陈酿勾兑贡酒，被霍家告发，宝泉益被封。从日本留学归来的青年季宗齐发动霍、卫两家和尽善村数百人签“万民折”进省城，最终风波得以平息。辛亥革命爆发后，史家陷入资金危机，肖子富与季宗齐力挽狂澜。东家史寿昌病入膏肓，临终前留下两份遗书。肖子富力助史纨清成为女东家。在季宗齐和肖子富的全力帮助下，“老白清酒”赢得了市场和口碑，并拿到了巴拿马万国博览会金奖，为国扬威。史家终于一统尽善村，长孙史霆却不愿继承家业。而季宗齐也要重新寻找救国之路，肖子富挑起了把“老白清酒”从手工业作坊向现代实业转型并最终做成民族品牌的历史重任。如果越军前来攻击，那根本挡不住。Boss, can we skip the calculation and look at the results directly?