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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.王朝的风云变幻,一群英雄的生死未卜,一段情缘的爱恨难分。曲折离奇，神秘莫测。，但神秘的红花会单翼蜻蜓不断出现，使乾隆陷入虎穴，困难重重，险象环生…… 　　乾隆与香香公主相遇，空空儿与方世玉相爱，但情仇难容，引出诸多是是非非,到底谁是单蜻蜓？红花会的主脑是谁？各美女的命运又是如何？串串连环之谜，曲折离奇！武馆女掌门黄小鱼作误闯娱乐圈，意外成为当红明星袁帆的贴身保镖，正式开始甜喜过招的同居生活。黄小鱼也向袁帆坦白了自己被大热武侠游戏《新斗罗大陆》NPC附身的秘密，开启了一段游戏和现实双线开恋的高甜时光。再发兵符……吾等皇子都留在皇宫，伺候皇上。内藤刚志主演的超人气推理小说将挑战集大成！蟒蛇见又来了一道火光，遂疯狂地缠紧板栗，勒得他气血翻涌，头脸涨红，手上劲就松了下来。