Device for sealing pipelines

A device for the sealing of pipelines, the device comprising:

• a plugging machine (100) including a body (101);
• a rigid tube (2) supported by the body of the plugging machine and extended therebelow;
• a stationary disc (3) integral to a lower end of the rigid tube and including an axial through opening (30) to which an internal cavity of the rigid tube is joined and which has a face (31) shaped like a truncated cone;
• a movable disc (4) arranged coaxial with and counter-facing the stationary disc with a relative face (41) having a truncated cone profile symmetrical to that of the face of the stationary disc, the movable disc including an axial shank (40) adapted to be inserted slidably in the axial opening of the stationary disc, so that the mutual distance between them can be adjusted;
• a sealing ring (50) of elastomeric material with a trapezoidal cross-section interposed between the stationary and movable discs and configured to expand radially outward when an axial compression is exerted on the stationary and moveable discs;
• a control rod (6) slidably inserted in the rigid tube, extended upwards to come out from the body of the plugging machine and downwards to abut against the axial shank of the movable disc;
• sliding drive means provided between a lower portion (6B) of the control rod and the axial shank of the movable disc, operated by axial translation of the control rod so as to make the axial shank and the movable disc move away from or close to the stationary disc the sliding drive means including two faces (71, 72) parallel to each other but sloping relative to a longitudinal centerline of the rigid tube, the faces configured to engage a complementary portion of the axial shank of the moveable disc;
• and
• operating means (8), associated to an upper portion (6A) of the control rod, provided to determine axial movements of the control rod.