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众人这才震惊，只有周夫子看着郑氏出神。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.The utility model has the following advantages:React Documentation Description　　他抬起頭笑，他低下頭哭，身無分文 他卻千金難買。人在同一天走进同一座军营，吃同样的饭，叠同样的被子，走同样的正步，却因为性格、动机、世界观的差异，彼此之间产生了各样的矛盾与冲突。在经历了一系列的挫折与磨练之后，他们完成了从普通老百姓到优秀军人的转变，练就了铁打的骨头，结下了生死的战友情谊，更铸成了为祖国、为人民一切行动听指挥、甘愿牺牲奉献的钢铁信念，表现出了和平年代的军人崇高的荣誉感与责任感。(2) Under the condition of low temperature, the elastic cushion plays the function of automatic compensation, ensuring the sealing performance of the valve, with simple and compact structure, good sealing performance, convenient installation and disassembly, and strong practicability.