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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.忽然，胡四一声惊叫，把手上的灯笼给抖掉地上去了，火光熄灭，四周陷入一片黑暗。板栗精神一振，仔细地打量他，很快就失望了。　　紧接着，陈飞的搭档胡建国在茶楼被人杀害，陈飞陷入到重重谜团之中。好友的意外死亡让陈飞情绪失控，同时，他多年前的枪伤病痛复发，公安局长苏兆龙将侦破胡建国被害案的重担交给了新来的重案组长。就在这样的情况下，一个男人对他说「我给你介绍一个适合你的工作！」。看着毛海峰的狂笑，杨长帆面无表情。　　兩個男人，一個女子，即便是大人又如何？在愛情面前依然如懵懂呆呆的孩童，他們兜兜轉轉，你追我趕，自以為懂得愛情的含義，又何曾掌握一絲主動，終歸成為了愛情的奴僕，遍體鱗傷，在所不惜