截止阀的柔性元件的径向变形值可以调节，保证柔性螺纹套的环槽与螺杆上的螺纹的接合深度。

Radial distortion of the flexible component in the stop valve can be adjusted so as to ensure the joint depth between flexible screw thread trepanning circular groove and screw thread on the screw.

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本发明在总结前人研究成果的基础上，不经过关环过程，创新性地采用真空—两性化法直接合成酰胺型表面活性剂。

Based on the summery of research findings by the predecessors, the invention is novel in direct synthesis of amide surfactants by vacuum-amphoteric method without ring closing reactions.

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前件包括限定与密封环的环形表面干涉配合式接合的轴向延伸的接合表面的足部。

The front piece includes a foot portion defining an axially extending engagement surface for interference-fit engagement with the annular surface of the seal ring.

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