Patent EA-001352-B1 (EA)
Title: Safety valve
Inventor: NIINIVAARA JUHANI
IPC: F16L55/105
Filed: 1998-08-03
Abstract: 1. The safety valve to stop flow in the flow pipe (3), the safety valve including a drilling device (8) with frame (6) to make a hole in the flow pipe, a winding device (7) fixed to the frame of the drilling device and a band (4), which is wound with the winding device, and means for connecting the valve to the outside surface of the pipe (3),characterized in that the the means for connecting the valve to the pipe comprises a seat comprising two substantially semicircular fixing shoes (1), connected by a joint (16) to each other and provided with a power device (17) to press the shoes around the pipe (3) and that the frame (6) of the drilling device (8) and the winding device have been fixed to the other shoe. 2. The safety valve of claim 1, characterized in that the safety valve includes a cleaning device to clean the outside surface of the pipe (3) from the area needed for the sleeve to be fixed to the pipe. 3. The safety valve of claim 2, characterized in that the cleaning device includes a cleaning ring, which consists of two ring segments (18) placed on the inner surfaces of the fixing shoes (1) the inner surfaces of the ring segments being provided with cleansing surfaces (14) and an drive mechanism to turn the cleaning ring around the pipe (3) in order to clean the outside surface of the pipe. 4. The safety valve of claim 2 or 3, characterized in that the drive mechanism includes a gear (11) joined to the cleaning ring and an operating motor (12) , which is joined so it is mainly immobile to the other fixing shoe (1) tangentially to the surface of the pipe, which includes a cog wheel (13), and the operating motor has been arranged to turn the gear and the cleaning ring by means of the cog wheel and that the outer surface of the cleaning ring is joined by threads (15) against the inner surfaces of the fixing shoes so that when the cleaning ring turns and cleans the surface of the pipe it moves from under the shoes. 5. The safety valve of any one of the claims 1-4, characterized in that the sleeve includes a sealing sleeve to seal the frame (6) of the drilling device to the outer surface of the pipe (3). 6. The safety valve of claim 5, characterized in that the sealing sleeve is connected to the fixing shoe (1) to which the drilling device (8) is connected. 7. The safety valve of claim 5 or 6, characterized in that the other fixing shoe (1) includes a sealing sleeve, which seals the fixing shoe to the outer surface of the pipe (3) around the drilling when a hole is drilled through the wall of the pipe. 8. The safety valve of any one of the claims 5-7, characterized in that the sealing sleeve includes at least one sleeve-like blade surface (9), which is placed so it is pressed against the outer surface of the pipe so it is pressure proof when the fixing shoes (1) are squeezed around the pipe (3). 9. The safety valve of any one of the claims 5-8, characterized in that the sealing sleeve includes at least two sleeve-like blade surfaces (9) one inside the other that can be pressed against the outer surface of the pipe (3) and the gap (10) between them can be pressurized with gas/liquid. 10. The safety valve of any one of the claims 1-9, characterized in that the safety valve is equipped with at least one support system mainly crosswise to the pipe (3) to support the band (4) wound into the pipe from the opposite side in relation to the pressure side. 11. The safety valve of claim 10, characterized in that the support system is connected by joint to the frame (6) of the drilling device and provided with a power device to turn the support system crosswise to the frame and pipe (3) after the frame of the drilling device has been pushed into the pipe. 12. The safety valve of claim 10 or 11, characterized in that the support system is equipped with a drilling system to drill the support system through the wall of the pipe (3) into the pipe. 13. The safety valve of any one of the claims 10-12, characterized in that the support system is placed in the frame (6) of the drilling device and consists of a telescopic pin system that pushes out. 14. The safety valve of any one of the claims 1-13, characterized in that the band includes two bands on top of each other joined at the edges and a sealing flange formed as an extention of the edge. 15. The safety valve of claim 14, characterized in that a sealing flange has been formed as an extention of both edges.