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A packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, the 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. The arcuate end face 12 forms a line seal between the sealing surface of the valve body 1 and the valve seat 7. The water grain 41 can ensure the sealing performance of the valve seat 7 and the valve disc 4.Method/Step 1——《谁言网络之恋不真实》记者根据网络上的帖子，通过蛛丝马迹，经过重重阻隔，千难万难，终于找到了痞.子蔡这位当事人，深度还原了痞舞之恋的来龙去脉，最后在痞.子蔡的呜咽声中结束了这次采访。就在此时，苏岸说道：还有风声。龚啸山‧好勇斗狠只有拳头才是真理《铁拳：血之复仇》的主人公是精通中国拳法的女高中生凌晓雨。 由于一件特殊的委托，凌晓雨潜入日本京都的国际学校，对一位名叫神谷真的少年展开调查。随后，凌晓雨发现了隐藏在“三岛财团”背后的秘密。Three teams play round robin matches. According to the points, the one with more points is the champion!