Patent Number: 051241129
Section: description

DETAILED DESCRIPTION OF THE INVENTION In FIG. 1, 1 designates a sealing joint and 2 a pipe socket. A pipe 3 for the operating rod of a control rod is welded to the pipe socket 2. The sealing joint 1 is applied around this joint. The sealing joint 1 is composed of the sealing bodies 4 and 5 through which the holes 6 and 7 are provided. The sealing bodies 4, 5 make contact with each other in a contact surface 8 and are displaceable in relation to each other along this surface. The holes 6, 7 are delimited in the sealing bodies 4, 5 by envelope surfaces 9, 10 and together form a channel through the sealing bodies 4, 5 and the contact surface 8. Sealing members 12 are arranged between the sealing bodies 4, 5 in the contact surface 8 around the channel 11. Each sealing body 4, 5 is divided into at least two discs 4a, 4b and 5a, 5b, respectively. Between two discs belonging to the same sealing body, one or more slots 13 are arranged, delimited by associated envelope surfaces 9, 10. In these slots 13 flexible sealing rings 13a have been located. The slots 13 may suitably have a cross section in the form of a triangle, as shown in the figure, with the base facing the envelope surface 9, 10. However, there may, of course, be other shapes of the slot 13, such as rectangular, parallel-trapezoidal, etc. The main thing is that the volume of the slot 13 is reduced when the discs 4a, 4b and 5a, 5b, respectively, are compressed, causing the sealing ring 13a to be partially pressed out of the slot 13. Several parallel sealing rings 13a may, as will also be clear from FIG. 1, be arranged between two discs. However, in that case a movable intermediate ring 14 must be placed between the sealing rings 13a. The discs 4a, 4b and 5a, 5b are guided in relation to each other by the elevations 15 in one of the discs and the recesses 16 in the other disc. In this case the sealing bodies 4, 5 are retained by bolts 17. However, other means may, of course, also be used, such as an external sleeve surrounding the sealing bodies. The bolts 17 are threaded in the outer disc 4a and run through a hole 21, which is enlarged in relation to the bolt diameter, in the sealing body 5. The bolts 17 are passed through a plate 18. Between this plate 18 and the sealing body 5, springs 19 are provided, in this case around the bolts. The nuts 20 are accessible to a remote-controlled special tool. In FIG. 2 the same designations as in FIG. 1 have been inserted. When a leak is to be sealed, the sealing joint is applied over the pipe socket 2 and the pipe 3. If these are eccentric in relation to each other, this can be handled by the sealing body 5 being laterally displaceable in relation to the sealing body 4, in which case the holes 6, 7 are also displaced in relation to each other. The displacement takes place along the contact surface 8 and is made possible by the bolt holes 21 in the sealing body 5 having a considerably larger diameter than the bolts 17. When the sealing joint is in position, the nuts 20 are tightened, causing the sealing rings 13a to be partially pressed out of the slot 13 in a direction towards the pipe 3 and the pipe socket 2, and the sealing members 12 start operating and achieve sealing between the sealing bodies. The region in the channel 11 between the sealing rings 13a thus becomes completely sealed.