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在阀门设计中,截止阀的阀瓣与阀杆连接有十几种形式,现介绍的圆弧键连接形式是一种新方法,用于口径50～200的各种截止阀,特别适用于腐蚀性、泥浆状介质的管道中。具体结构如附图所示。将阀杆1向下放进阀瓣4中,阀杆头部球面接触阀瓣上端孔内的支承平面。阀瓣与阀杆间有一定的径向间隙,能保证阀瓣轴向微量摆动和径向自由转动。阀杆头部轴颈的槽宽H比阀瓣上端的两缺口宽度h尺寸略大,以保证阀瓣在关闭时,将作用在阀杆上的力通过球面传递到阀瓣上。阀杆虽作下降旋转运动,两个圆弧键并未受力。阀瓣开启时,阀杆作上升旋转运动,此时圆弧键才受到力的作用。
In the valve design, the valve closing the valve stem and the valve rod has more than a dozen forms are introduced arc key connection is a new method for all sizes of 50 ~ 200 globe valve, especially for corrosion Sexual, muddy medium in the pipeline. Specific structure as shown in the figure. Put the valve stem 1 down into the valve disc 4, and the spherical head of the valve stem contacts the supporting plane in the upper end hole of the valve disc. There is a certain radial clearance between the valve disc and the valve stem to ensure that the valve disc can swing slightly in the axial direction and rotate freely in the radial direction. Valve stem head journal groove width H than the valve notch at the top of the two gap width h size slightly larger to ensure that when the valve flap is closed, the role of the stem on the force transmitted to the valve through the spherical. Although the stem for downward rotation movement, the two arc keys are not stressed. When the valve is opened, the stem moves up and down. At this moment, the circular arc key is subjected to force.