| 摘要 |
FIELD: pipe line transport. SUBSTANCE: second end of the pipes to be joined is provided with spiral grooves. The coupling is provided with answered spiral grooves that allow the ends of the pipe to be joined tightly over the cylindric surface. One of the spiral grooves has radial hollow. The number of locking pins is equal to the number of grooves. EFFECT: enhanced reliability. 2 cl, 4 dwg |
