| 摘要 |
FIELD: machine building. ^ SUBSTANCE: device consists of hollow cylinder case with thread, end tubular saw, passage for medium and built-in valve. The device is designed for cutting orifice in a pipeline by screwing the case into a shank with internal thread, and also for shutting off leaks from the seat-like head owing to the built-in valve. ^ EFFECT: extended arsenal of technical means. ^ 10 cl, 20 dwg |
