A SEALING RING FOR USE IN A BRANCH PIPE OR DRILLING SADDLE AND BRANCH PIPE SADDLE PROVIDED WITH SAID SEALING RING

Abstract: A sealing ring for use in a branch pipe or drilling saddle, comprises an end face profile (7) designed to engage the bottom of a packing groove in said saddle and an operational prodile adapted to adjoin the outer wall of a pipe. Portions (10) of the side walls of the sealing ring (6) extend slopingly in relation to the end face profile (7), while the cross-sectional width (b₁) of the sealing ring near its end face profile (7), is smaller than the width (b₂) at distance from said end face prodile, the greatest width (b₂) of the cross-­ section of the sealing ring (6) being greater than the width (b) of the package groove and adapted to contact the sides of said packing groove.

Description: packing groove, the width of the sealing ring at the end face profile thereof, being smaller than the width of the packing groove. The slopingly extending side walls of the sealing ring are in this case constructed as pointing edges, so that the sealing ring may be easily installed in the groove and cannot fall out of said groove. The invention is further embodied in a branch pipe saddle, or a drilling saddle, comprising a sealing ring of the kind as described above, which saddle and/or sealing ring are constructed such, that an improved mounting of the respective branch pipe or drilling saddle by adhering the sealing ring in the packing groove, has become superfluous. The present invention will be illustrated with the aid of the accompanying drawings, wherein: Fig. 1 is a cross-section through a pipe, also illustrating part of a branch pipe saddle or drilling saddle, provided with a sealing ring, and mounted thereupon; Fig. 2 is a cross-section through a known embodiment of a sealing ring for use a branch pipe saddle or drilling saddle; Fig. 3 is a similar cross-section through a known sealing ring in a modified embodiment; Fig. 4 is a cross-section through a sealing ring partly comparable with that of Fig. 2, but embodied in accordance with the present invention; Fig. 4a is an alternative embodiment of the crosssection of Fig. 4; Fig. 5 is a cross-section through a sealing ring comparable with the embodiment of Fig. 3, but embodied in accordance with the present invention; and Figs. 6, 7 and 8 are cross-sections of a sealing ring in accordance with the invention, provided in a packing groove of a branch pipe saddle or drilling saddle but in positions dependent upon three different pipe diameters, for which said sealing ring can be used. Fig. 1 shows a cross-sectional view of a branch pipe saddle or drilling saddle 2 comprising a branch 2a and mounted in a conventional manner upon a pipe 1 by means of a semicylindrical scale 3 being integral with said branch 2a. The cavity 4 of the branch 2a coincides with an opening 5 accurately drilled into pipe 1 by means of said saddle 2. The scale 3 is fastened upon the pipe 1 by means of a semi-cylindrical counter-scale, while adding a sealing ring 6 engaging into a packing groove in the branch pipe or drilling saddle. In order to keep the production expenditures for branch pipe or drilling saddles as low as possible, one and the same model is generally used for pipes having differing diameters, so that only the internal diameter of scale 3 has to be adapted to the diameter of the pipe to be used. Figs. 2 and 3 show a cross-section of the type of sealing rings as used. The rings of Fig. 2 are preferably used in saddles destined for pipes having smaller diameters, while the type of sealing rings as illustrated in Fig. 3 are preferably used in saddles to be mounted upon pipes having a greater diameter. The ring of Fig. 3 can actually only difficultly be disposed in the form of a short arc, since its resilient collar 9 will then start to take an upright position. Although the sealing ring of Fig. 2 exerts a pressure upon the outer wall of pipe 1 around the opening 5 greater than the pressure exerted by the sealing ring in Fig. 3, the smaller pipe diameters cause the pipe to be relatively more rigid than the pipe of Fig. 3 so that any risk of a deformation of the said pipe is obviated to a greater extent. Although in both embodiments the width b of the cross section of the sealing ring 6 corresponds to the width b of the packing groove in the branch pipe or drilling saddle 2, difficulties may arise in relation to the diameter of the pipe 1 to be provided with a branch pipe or drilling saddle 2 (fig. 1). Although the projectional diameter D is proposed to correspond to that of three various pipes, the lengths of arc of whit for differing pipe thicknesses, so that, for instance, the length of arc L1 of a pipe having a greater diameter, is shorter than the length of arc L2 of a pipe having a smaller diameter. From the latter it follows, that the average diameter of a sealing ring 6 adapted to the average diameter of a pipe 1 will either be too great for a pipe having a greater diameter or too small for a pipe having a smaller diameter. Additionally installing the sealing ring of Figs. 2 and 3 in a packing groove will often tend to cause problems. In Figs. 4, 4a and 5, the sealing rings according to the invention are therefoztso embodied, that portions 10 of the side walls of the sealing ring slop ingly extend with respect to the end face profile 7, the width b1 of the sealing ring 6 near said end face profile 7, being smaller thon the width b2 at distance from said end face profile 7. In addition the width of the cross-section of the sealing ring on a region situated at a greater distance from the end face profile 7 than the region having the greatest width b2, is smaller than said greatest width b2. The greatest width b2 of the sealing ring 6 is greater than the width b of the packing groove while the width b1 of the sealing ring mear the end face profile 7 is smaller than the width b of the said packing groove. The region having the greatest width is embodied as an inner and/or outer edge ila, lib respectively, situated at the innermost, outermost surface respectively of the sealing ring b. Said inner and/or outer edges tla, 11b respectively preferably have the shape of an acute edge. As can be seen in Figs. 6, 7 and 8 the presence of the portions 10 shaped as pointing edges, cause the sealing ring according to the invention to be easily and sealingly installed in the packing groove for pipes having different diameters. The sealing ring of Fig. 6 is too great for the projectional diameter D of the packing groove. The sloping side wall 11a forming the inner edge of portion b adjoins the side wall of the packing groove of said Figure 6 while the sloping side wall lib of portion 10 forming the outer edge of the packing groove is impressed. In this case it concerns a pipe having a greater diameter. In Fig. 7, the sloping side walls of portions 10 forming edges lia and 11b optimally adjoin the side walls of the packing groove; it concerns here a pipe 1 having an average diameter. In Fig. 8 the sealing ring according to the invention is used for a pipe 1 having the smallest diameter so that said ring would actually be too small. In this way, however, the inner edge lia is impressed whereas the outer edge 11b still adjoins the side wall of the packing groove, so that an optimum clamping is obtained without any deformation of the respective sealing ring. In this case the end face and the operational profile provide the required sealing. A sealing ring for use in a branch pipe or drilling saddle and branch pipe saddle provided with said sealing ring. The invention relates to a sealing ring for use in a branch pipe or drilling saddle, said sealing ring comprising an end face profile designed to engage the bottom of a packing groove in said saddle, and an operational profile, adapted to adjoin the outer wall of a pipe. A branch pipe saddle, or a drilling saddle, is known in the art and consists of a semi-cylindric scale, the size of which is adapted to the diameter of a pipe to be provided with c branch line. Said known saddle comprises a pipe portion or branch in which a branch pipe is installed. In actual practice, generally one and the same branch is used for pipes having differing diameters, whilst only the internal diameter of the semi-cylindrical scale will vary in order to appropriately fasten a saddle upon a pipe having a given diameter. The sealing of the saddle is effected by providing the surface of the saddle which adjoins the pipe with a packing groove surrounding the opening in the branch, into which groove a sealing ring or sleeve engages. The pressure exerted by the sealing ring upon the pipe should then be as slight as possible, as the respective bore or drilling has weakened the pipe wall at the branch so that , in case of a low internal flyid pressure prevailing the pipe wall will be pressedZwardly by said sealing ring. With a view to the latter, sealing problems may occur in the course of time, even to such an extent that the sealing ring or sleeve will get pressed betwen the gappresently occurring between the pipe and the respective saddle. Notwithstanding that the predetermined projectional diameter of the packing groove is the same in the branch pipe saddle for differing pipe diameters, additional deviations may occur as a result of the differing pipe diameters, and may either cause the risk of an insufficient engagement of the sealing ring into the packing groove or to fall said ring out of said groove. The present invention aims to alleviate said disadvantages. According to the invention this is attained with a sealing ring, which is characterized in that portions of the side walls of the sealing ring slopingly extend in relation to the end face profile of said sealing ring, the crosssectional width of the sealing ring near its end face profile, being smaller than the width at distance of said end face profile, the greatest cross-sectional width of the sealing ring being adapted to contact the sides of the packing groove. The sealing ring according to the invention is preferably embodied in such a manner, that the width of the crosssection of the sealing ring on a region situated at a distance from the end face profile which is greater than the region having the greatest width, is smaller than said greatest width. The invention in another aspect is also embodied in a sealing ring comprised in a branch pipe saddle or a drilling saddle of the kind as described hereabove, which assembly is characterized in that the greatest width of the crosssection of the sealing ring exceeds the width of the

Claims: Claims: 1. A sealing ring for use in a branch pipe or drilling saddle, said sealing ring comprising an end face profile designed to engage the bottom of a packing groove in said saddle and an operational profile adapted to adjoin the outer wall of a pipe, characterized in that portions (10) of the side walls of the sealing ring (6) extend slopingly in relation to the face profile (7), the cross-sectional width (bl) of the sealing ring near its end face profile (7), being smaller than the width (b2) at distance from said end face profile, the greatest crosssectional width of the sealing ring being adapted to contact the sides of the packing groove. 2. A sealing ring according to claim 1, characterized in that the width (bl) of the cross-section of the sealing ring (6) on a region situated at a distance from the end face profile (7) which is greater than the region having the greatest width (b2), is smaller than said greatest width (b2). 3. A sealing ring as claimed in claim 1 and/or 2, with a branch pipe or drilling saddle comprising a packing grooves characterized in that the greatest width (b > ) of the cross-section of the sealing ring (6) is greater than the width (b) of the packing groove. 4. A sealing ring with a branch pipe or drilling saddle as claimed in claim 3, characterized in that the width (bl) of the sealing ring (6) at the end face profile (7) thereof, is smaller than the width (b) of the packing groove. 5. A sealing ring as claimed in claim 1, characterized in that the slopingly extending side walls (lla,llb) of the sealing ring (6) are shaped as pointing edges. 6. A sealing ring as claimed in any one or more of claims 1-5 characterized in that the region of the sealing ring (6) having the greatest width (b2 constitutes an inner and/or outer edge (gila, lib) at the innermost, outermost surface respectively, of the sealing ring. 7. A sealing ring as claimed in claim 6, characterized in that said inner and/or outer edges (11a, 11b) are preferably as acute edges. 8. A branch pipe or drilling saddle comprising a packing groove, characterized in that said groove is provided with a sealing ring (6) as claimed in any one or more of claims 1 to 7 incl.

Inventors: OFFRINGA, OEGE RENE, Offringa, Oege René
Applicants: WAVIN B.V.
Application year: 1982
Main classification: F16L41
IPC codes: F16L41