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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, A packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, 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 which 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, the packing assembly 9 comprises a flexible graphite packing layer.Public delegate void DoSth (object sender, EventArgs e);讲述了几个年轻人共同经历的发生在清宫里的妙趣横生曲折离奇的奇葩生活。堪称史上最狂，最霸气，最正能量版还珠格格！ 秒杀‘赵薇’‘林心如’版 让你笑出深度，乐出内涵！早……说啊。ICAO language level is currently a hard indicator in China, requiring more than 4 levels. If you learn to fly in China, you need to take the ICAO English proficiency test in China. If you learn to fly abroad, you will bring your own 4 levels.Hong Kong has released a data survey on divorce, which sampled 7,000 families. The final results show that single-parent families will not cause obstacles to children's learning and behavior habits.　　Season 3, Episode 3: The Musgrave Ritual《马斯格鲁夫典礼》23 July 1986