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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.召唤被封印的恶魔维尔梅。她自古以来就是令人害怕的“恶魔”，拥有带来灾难的强大力量。　　派出所长刘大林带领学校老师、学生家长组织学校自救，在他的努力下就出了许多掩埋在废墟里的孩子，然而他自己的儿子却因为压在废墟中太久得不到及时救援而离去。刘大林强忍着悲伤继续指挥自救，他把他的父爱给了所有被压在黑暗中的孩子们。How to use the Word column? The so-called column splitting is to set all pages or selected contents of Word documents to multiple columns, thus presenting the column splitting typesetting effect often used in newspapers and magazines.郑长河听得头晕，赶忙问道：爷爷就问你，你跟板栗管不管得着他们家？葫芦张大嘴巴，不知如何跟爷爷解释。