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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.Private int num1;小爷也不告诉你宝贝藏哪嬴诗曼摇头道：不是这么简单，第一个或许喜欢。果然，一只肥大的灰兔走走停停，跐溜一下窜进树丛，停在他们面前，瞪着圆溜溜一双琥珀眼，对着树根下三张陌生的脸颊愣神。她比之前耍弄心机、跟他们斗智斗勇、镇定周旋更让人无法对抗。进房后，瞅见大哥在座，顿时丢开小丫头的手直扑过去，抱着板栗的腰，笑得两眼弯成月牙，娇声叫道：大哥。