主要研究了楔形变截面压杆绕弱轴的弹塑性弯曲失稳。

The elastoplastic bending instability of the tapered compression members under axial loads about the weak axis is mainly studied.

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而且由于阀杆的楔形块与燕尾槽的作用，对阀门增加了强制密封力，增大了密封比压，实现双向密封。

And because the wedge block and the role of the dovetail groove of the stem, the valve increases the forced sealing force, increases the sealing pressure ratio, the two-way sealing.

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