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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.无论贵贱，来了便是我徽王府的宾客。一条小街，三位七旬老人，他们讲的是传统；三个刚走出校门的大学生空降到对面，他们讲的是挑战和突破。“对台戏”的戏台就坚实地砸在这条小街上。情战、商战、谍战、宫战的炮竹捻儿就此点燃……且看一群老、一群少就此开撕，演绎了这个美食与传承的江湖。差不多了。年轻帅气的小生Tippadai 到苏梅岛旅游，在岛上遇到了回家的Prida。开始时两人如冤家般话不投机半句多。之后接触多了，二人心理渐渐对对方有了化学反应。离开苏梅岛之前，Tippadai留了名片给Prida 。Therefore, it is necessary to develop a detection system to make it difficult for attackers to optimize the payload. Here are three key design strategies to help achieve this.