具备弹性的塑料结构 螺纹还可以“贴合” 但是金属件是不能靠螺纹“贴合”的
必定需要和设计一个可以利用弹性接触的密封结构 螺纹紧紧提供“锁紧”产生的压力
当然也可以靠生料带 甚至大型管道也继续有类似的各种带
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PT/Rc或者NPT 锥管螺纹可以自密封
G直管螺纹必须要填料比如生料带
高压（大于100bar）用过额外加端面密封圈的卡套
超高压1030bar的看图反而没那多事，直接UN/G螺纹卡套怼上去了，没上手拆过不知道里面填了啥
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