螺纹连接的阀盖
Threaded bonnet
以上为机器翻译结果，长、整句建议使用 人工翻译 。
经分析得出：事故原因是减压阀阀座和阀盖的连接螺纹接触高度过小，强度不足，导致螺纹连接失效。
The screw joint of the reducer bonnet and body was concluded as the failure position because of its small contact height.
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