| 摘要 |
A shutoff flange cock has shutoff unit installed in the body, this has flanges connected to each other by threaded joint by means of buckles, at that each buckle is arranged with fixation head placed at the outer side of flange inside its depressions within overall dimension of its thickness, at that thickness of fixation head is chosen from ratio 0.25-0.75 of flange thickness, and its outer surface is arranged with groove as polyhedron or slot.
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