GB2207722A - Seals for use in sealing tube and pipe joints - Google Patents
Seals for use in sealing tube and pipe joints Download PDFInfo
- Publication number
- GB2207722A GB2207722A GB08715541A GB8715541A GB2207722A GB 2207722 A GB2207722 A GB 2207722A GB 08715541 A GB08715541 A GB 08715541A GB 8715541 A GB8715541 A GB 8715541A GB 2207722 A GB2207722 A GB 2207722A
- Authority
- GB
- United Kingdom
- Prior art keywords
- seal
- tube
- pipe
- flare
- free end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
- F16L19/028—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0212—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means
Abstract
There is disclosed a seal intended for use with a tube or pipe having a flare at its free end region, which seal is generally annular and is optionally provided with one or more than one slot to allow the seal to be fitted more easily to the free end region of the tube or pipe, the seal having:- one portion which is flared and is intended to abut a corresponding flare of the tube or pipe; and at least one other portion adjacent said one portion and intended to help locate the seal at the free end region of the tube or pipe. There is also disclosed a joint constituted by a tube or pipe provided with a flare, a fitting with a corresponding flare and to which the tube or pipe is to be joined, means for urging the tube or pipe towards the fitting, and, provided in the region of the flare of the tube or pipe, a seal as mentioned above. The seals contribute to effective, inexpensive joints. <IMAGE>
Description
SEALS FOR USE IN SEALING TUBES AND PIPES
This invention relates to seals, in particular to seals suitable for use in sealing tubes or pipes to compatible fittings to make fluid-tight joints.
Metal tubes or pipes, such as those used for conveying hydraulic fluids in a motor vehicle, are typically of the so-called double wall wrapped variety (such as those made of Bundy by Armco) where the material of the tube or pipe is wrapped around itself so that effectively it forms two complete revolutions, or of the single wall butt welded variety. However, with both of these varieties, leakage can be experienced in practice in the region of the overlap of the double wall wrapped variety or in the region of the butt weld in the single wall butt welded variety, particularly where the tube or pipe changes its diameter during forming, such as in the region of a single flare or convex flare. The nature of these flares will be explained below, but generally flares are employed at an end region of a tube or pipe where the tube or pipe is to form a joint with some other fitting.
Instead of using a double wall wrapped tube or pipe or a single wall butt welded tube or pipe, it is possible to use a cold drawn seamless tube or pipe which is considerably less susceptible to the leakage problems associated with the double wall wrapped variety and single wall butt welded variety, but the problem is that currently (1987) the cold drawn seamless variety is approximately 2.5 times more expensive than the other varieties.
With reference now to Figure 1 of the accompanying drawings, there is shown a standard convex flare type joint 10; a major component of the joint is a female fitting 11 which has a main bore 12 which opens via a divergent face 13 to an enlarged bore 14 provided with an internal screwthread. Located coaxially within the enlarged bore 14 is a tube or pipe 15 of which the internal diameter is similar to that of the main bore 12. At its distal, free end region the tube 15 is provided with a convex flare which is formed by a divergent part 16 and, leading on therefrom, a convergent part 17.Also provided, partially within the enlarged bore 14, is a hollow nut 18 having an external screwthread which engages the internal screwthread of the enlarged bore 14, the nut also having an inclined face 19. when the nut 18 is tightened, so as to cause it to move more into the enlarged bore 14, the inclined face 19 abuts the divergent part 16 of the convex flare and causes the tube or pipe 15 to be moved inwardly into the female fitting 11, thus causing the convergent part 17 of the convex flare to abut the divergent face 13 and to form therewith a seal. The more that the nut 18 is tightened, theoretically the greater the sealing effect between the convergent part 17 of the convex flare and the divergent face 13 of the female fitting.However, the forces involved can cause some breakdown of the sealing qualities of a double wall wrapped, or a single wall butt welded, tube or pipe, with the result that there can be a line of leakage from the main bore 12, between the divergent face 13 and convergent part 17, to the region of the engaged screwthreads.
Also, any excessive tightening of the nut 18 can cause considerable distortion of the convex flare 16, 17 and this, also, increases the likelihood of a breakdown in the sealing effect, with also the risk that the free end of the'convergent part 17 is forced into the fluid-conveying bore, thus disrupting the fluid flow.
Another type of known arrangement is shown in
Figure 2 of the accompanying drawings, this being a standard single flare type joint 30. Here, there is a male fitting 31 provided with a bore 32, an external screwthread 33 and an inclined (convergent) face 34.
The tube or pipe 36 which is to be joined to the male fitting 31 has a divergent flare 37. Also present is a sleeve 38 which has a generally cylindrical body 39 and which is provided at an intermediate region with a collar 40 and at its distal end region with an inclined (divergent) face 41. The face 41 is intended to abut one side of the flare 37, and the other side of the flare 37 is intended to abut the inclined face 34.
The joint 30 also includes a hollow nut 42 which has a collar 43 capable of engaging the collar 40 of the sleeve 38. The nut 42 also has an internal screwthread 44 in engagement with the external screwthread 33 of the male fitting 31.
Upon tightening the nut 42, the collar 43 of the nut 42 acts on the collar 40 of the sleeve 38 to urge the sleeve 38 towards the male fitting 31, with the result that, increasingly, the inclined face 41 of the sleeve 38 acts on one side of the divergent flare 37 which is caused increasingly to press against-the inclined face 34 of the male fitting 31, thereby creating the sealed joint. However, as with the convex flare type joint 10 shown in Figure 1, the forces acting on the divergent flare 37 shown in Figure 2 can cause damage to the flare 37 and permit a line of leakage between the interior of the joint 30 to the region of the engaged screwthreads 33 and 34.
The problem of leakage with the joints 10 and 30 is not solved by further tightening of the nuts 18 and 42, as this can cause an increase in the degree of breakdown of the tube or pipe 15 or 36 in the regions of the flare 17 or 37, respectively. Moreover, excessive tightening of the nut 18 or 42 can cause such distortion of the flare 16, 17 or 37 that dismantling of the joint 10 or 30 can be made difficult.
With the types of joints 10 and 30 shown in
Figures 1 and 2, it is usually necessary to employ a high degree of accuracy in respect of the seating angles with a view to effecting a good seal; moreover, high quality surface finishes are required on the sealing surfaces, and these requirements for accuracy and good surface finish mean that extremely strict tolerances have to be employed, which increases the cost of producing the components.
It was with a view to reducing the degree of precision forming required that another type of joint was devised, this being the type of joint 50 illustrated in Figure 3 of the accompanying drawings, where a standard "0" ring is employed. Here a female fitting 51 is provided with a main bore 52 which leads via a radial face 53 to an enlarged bore 54 provided over a distal region with an internal screwthread 55.
A hollow nut 56 is provided which has an external screwthread 57 which engages the internal screwthread 55 of the female fitting 51. The nut 56 is provided at a distal end thereof with an abutment face 58.
Located coaxially within the hollow nut 56 and female fitting 51 is a tube or pipe 59 which at its free end region is formed, in the direction towards the free end, with a first divergent part 60, a convergent part 61 and a second divergent part 62. Located in the concave angle between the parts 61 and 62 is an "0" ring 63.
The internal diameter of the main run of the tube or pipe 59 is approximately the same as that of the main bore 52, and the minimum diameter in the region of the tube or pipe 59 where the parts 61 and 62 meet is also approximately the same, so that there is no restriction of the fluid path. However, with a view to effecting a good seal, there is a tendency for the nut 56 to be tightened excessively, with the result that the abutment face 58 acts excessively on the first divergent part 60, and this can have the effect of causing excessive distortion of the parts 61 and 62 so that the angle therebetween becomes progressively smaller and so that the region of the join between those parts 61 and 62 protrudes increasingly into the fluid flow path.Excessive tightening of the nut 56 does not necessarily lead to an enhanced seal, because of the undue distortion of the parts 61 and 62, the part 62 being prevented from further longitudinal inward movement by its action on the radial face 53 of the female fitting 51.
Here again, the excessive forces applied in the region of the joint can cause such distortion in the region where the sealing should occur that dismantling of the joint 50 can be impeded.
Other types of washers have been employed which have been dropped into place, but these can be badly seated or misplaced in transit.
According to one aspect of the present invention, there is provided a seal intended for use with a tube or pipe having a flare at its free end region, which seal is generally annular and is optionally provided with one or more than one slot to allow the seal to be fitted more easily to the free end region of the tube or pipe, the seal having:
one portion which is flared and is intended to abut a corresponding flare of the tube or pipe; and
at least one other portion adjacent said one portion and intended to help locate the seal at the free end region of the tube or pipe.
Another aspect of the present invention provides a joint constituted by a tube or pipe provided with a flare, a fitting with a corresponding flare and to which the tube or pipe is to be joined, means for urging the tube or pipe towards the fitting, and, provided in the region of the flare of the tube or pipe, a seal as defined in the immediately preceding paragraph.
The seals of the present invention can, at least in some embodiments, "snap" securely into their appropriate locations.
The particular shape of the seal in accordance with the present invention will depend on the shape of the flare of the tube or pipe to be joined to the fitting, and also on the shape of the mating region of the fitting.
In some cases it will be possible to employ seals in accordance with the present invention without modifying in any way the shape of the flare of the tube or pipe or any other component of the joint, but in this case the seal might protrude slightly into the fluid flow path through the joint. To avoid such intrusion, the shape or length of the flare can be modified so that, even when the seal is fitted, there is no intrusion into the fluid flow path.
A first embodiment of the first aspect of the present invention provides a seal intended for use with a tube or pipe having a convex flare at its free end region, which seal is generally annular and is optionally provided with one or more than one slot to allow the seal to be fitted more easily to the free end region of the tube or pipe, the seal having:
a first part intended to be located within part of the convex flare at the free end region of the tube or pipe;
a second, generally cylindrical part adjacent the first part; and
a third part which is adjacent the second part but remote from the first part, the third part being intended to abut the free end part of the convex flare.
Preferably this first embodiment of seal has slots in its first portion, preferably two or more slots, more preferably two slots.
A second embodiment of the first aspect of the present invention provides a seal intended for use with a tube or pipe having a flare at its free end region, which seal is generally annular and is optionally provided with one or more than one slot to allow the seal to be fitted more easily to the free end region of the tube or pipe, the seal having:
a first, generally cylindrical part intended to be located within the tube or pipe;
a second, flared part adjacent the first part and intended to lie against the flare of the tube or pipe; and
a third, generally radial part adjacent the second part but remote from the first part.
Preferably this second embodiment of seal has a plurality of slots, which are preferably located in the first part of the seal. More preferably there are two diametrically opposed slots provided in the first part of the seal.
A third embodiment of the first aspect of the present invention provides a seal intended for use with a tube or pipe having a flare at its free end region, which seal is generally annular and is optionally provided with one or more than one slot to allow the seal to be fitted more easily to the free end region of the tube or pipe, the seal having:
a first, generally flared part intended to abut the internal surface of the flare of the tube or pipe;
a second, intermediate part adjacent the first part and intended to abut the free end of the flare of the tube or pipe; and
a third part adjacent the second part but remote from the first part, the third part being generally parallel to the first part and intended to assist in locating the seal on the flare of the tube or pipe.
Preferably this third embodiment of seal is provided with a plurality of slots which are preferably located in the third part of the seal; preferably there are four slots equidistantly spaced around the periphery of the third part of the third embodiment of seal.
For a better understanding of the present invention and to show how the same may be carried into effect, reference will now be made, by way of example, to Figures 4 to 12 of the accompanying drawings, in which:
Figure 4 is a longitudinal section through a joint between a tube or pipe and a female fitting, the joint including a first embodiment of seal in accordance with the present invention;
Figure 5 is a longitudinal section, on an enlarged scale, of the end region of the tube or pipe shown in
Figure 4;
Figure 6 is a longitudinal section, on an enlarged scale, through the seal shown in Figure 4;
Figure 7 is a longitudinal section through a tube or pipe having at its free end region a modified metric convex flare; ;
Figure 8 is a longitudinal section through a seal which is similar to that shown in Figure 6 but slightly modified and suitable for engagement with the flare of the tube or pipe of Figure 7;
Figure 9 is a longitudinal section through the free end region of a tube or pipe having a double 450 flare;
Figure 10 is a longitudinal section through a second embodiment of seal in accordance with the present invention and suitable for use with the tube or pipe flare shown in Figure 9;
Figure 11 is a longitudinal section through a tube or pipe and its flare, similar to that shown in Figure 9; and
Figure 12 is a longitudinal section through a third embodiment of seal in accordance with the present invention and intended for sealing the flare region of the tube or pipe shown in Figure 11.'
Turning now to Figure 4 of the drawings, there is shown a joint 70 which includes a female fitting 71 having a main bore 72 which leads, via a divergent face 73, to an enlarged bore 74 provided with an internal screwthread.
A tube or pipe 75 which is generally cylindrical over the majority of its length has at its free end region a convex flare formed by a divergent part 76 and, leading on therefrom, a convergent part 77. These divergent and convergent parts 76 and 77 are similar to the divergent and convergent parts 16 and 17 of the tube or pipe 15 shown in Figure 1, except that in
Figure 4 the convergent part 77 is shortened so as to allow the fitting of a seal without the seal intruding into the flow path of fluid.
Also in the joint 70 is a nut 78 which has an external screwthread which cooperates with the internal screwthread of the female fitting 71; the nut 78 also has an inclined face 79 intended to abut the divergent part 76 of the convex flare of the tube or pipe 75. As indicated above, fitting over the convergent part 77 of the convex flare is a seal 80 (shown in more detail in
Figure 6).
Upon tightening the nut 78, the nut 78 moves into the female fitting 71 and the inclined face 79 urges the divergent part 76 of the convex flare towards the main bore 72 with the result that the convergent part 77 of the convex flare urges the seal 80 firmly against the divergent face 73 of the female fitting 71, thereby effecting a good seal, even if the convergent part 77 of the convex flare of the tube or pipe 75 and the divergent face 73 of the female fitting 71 are not polished to a high standard.
Figure 5 shows in more detail the free end region of the tube or pipe 75 which, like all of the other tubes or pipes illustrated in the accompanying drawings, is symmetrical about its centreline. The convex flare shown in Figure 5 is of the Imperial type defined by the two flared parts 76 and 77 of the flare.
In a standard convex flare the convergent part 77 is longer than is shown in Figure 5 and in fact terminates approximately on a line having the same diameter as the internal diameter of the main part of the tube or pipe 75. However, in the embodiment illustrated in Figure 5, the convex flare is modified in that the convergent part 77 is shortened such that, when the seal 80 is fitted thereto, there is no bore restriction compared with the standard convex flare. The seal is of the internal type.
The seal is shown in more detail in Figure 6, and here there can be clearly seen a first part 81 which is to be accommodated within the angle between the inclined parts 76 and 77 of the convex flare of the tube or pipe 75. The seal also has a generally cylindrical second part 82 and a third part 83 which abuts the leading face of the convergent part 77 of the convex flare. The seal 80 is provided in its first part 81 with two diametrically opposed slots 84 which enable the diameter of the first part 81 of the seal 80 to be temporarily reduced whilst the first part 81 of the seal 80 is being forced inwardly past the free end of the tube 75, whereafter the first part 81 can expand and be properly accommodated within the angle between the divergent and convergent parts 76 and 77.The seal 80 has a "snap-on" action, when being fitted to the tube or pipe 75; also, the shape of the seal 80 is such that it is prevented from being forced by fluid under high pressure out through the join.
Figure 7 shows a tube or pipe 90 having a modified convex flare of the metric type, this flare being made up of three parts, namely a first generally radial part 91, a second generally cylindrical part 92, and a third convergent part 93 on which a seal 94 is located. The flare is modified in that the third part 93 is shortened in that it has a minimum internal diameter greater than that of the main bore of the tube 90, thus allowing the seal 94 to be fitted without protruding significantly into the fluid flow path.
The seal 94 is shown in more detail in Figure 8 and, rather like the seal 80 shown in Figure 6, it has first, second and third parts 95, 96 and 97 respectively which function in the same way as the first, second and third parts 81, 82 and 83 of the seal 80 of Figure 6. Also, the seal 94 has two diametrically opposed slots 98 provided in the first part 95, like the slots 84 of the seal 80 shown in
Figure 6.
Turning now to Figure 9, there is shown a tube or pipe 110 which has a double 450 flare made up of a divergent flare portion 111 and a return 112. The return 112 terminates in such a position that its minimum internal diameter corresponds to the internal diameter of the main bore of the tube or pipe 110.
Located at the free end region of the tube or pipe 110 is a seal 113 which is shown in more detail in Figure 10 and which is in accordance with the second embodiment. The seal 113 has a generally cylindrical first part 114 having an external diameter comparable to the internal diameter of the main bore of the tube 110. The seal 113 has, leading from one end of the first part 114, a divergent second part 115 which is intended to abut the return 112 of the tube 110, this second part 115 leading to a radial third part 116.
The tube or pipe 110, into which the seal 113 has to be inserted, is of the standard type in that it is of such a design that it can be used without a seal, although with the risk of leakage. The seal 113 when used with the standard type of tube or pipe 110 does, as is clearly shown in Figure 9, intrude into the fluidconveying bore and thus it can only be used where any restriction in the bore is not critical. The first part 114 of the seal 113 is provided with an annular external protrusion 118 to assist in sealing and locating, and there is provided an annular recess 119 in the external surface between the first part 114 and second part 115 to assist in flexing of the divergent part 115 relative to the cylindrical part 114.
The tube or pipe 110 shown in Figure 9 has a double 450 flare, but the same general type of seal can be applied to a single 450 or 370 flare or to a double 370 flare.
Turning now to Figure 11, the tube or pipe 130 shown therein is similar to the tube or pipe 110 shown in Figure 9. The tube or pipe 130 has a double 450 flare made up of a divergent flare part 131 and a return 132. Located around the flare is a seal 133 which, unlike the seal 113 shown in Figure 9 is of the external type and does not intrude into the fluid flow path. The seal 133 is made up of a first part 134 which is to abut the internal surface of the return 132 of the flare of the tube or pipe 130, a second intermediate part 135 adjacent the first part 134 and intended to abut the free end of the flare, and a third part 136 adjacent the second part 135 but remote from the first part 134, the third part 136 being generally parallel to the first part 134 and intended to locate the seal 133 on the flare of the tube or pipe 130.
The third part 136 of this third embodiment of seal is provided with four slots 137 equidistantly spaced around the periphery of the seal 133, these slots allowing the third part 136 to be temporarily expanded as it is moved over the free end region of the tube or pipe 130, whereafter it can retract to its normal position, secured around the free end region of the tube or pipe and with a portion of the third part 136 abutting the external surface of the divergent flare part 131 of the tube 130. The seal 133 and its relation to the tube or pipe 130 are of the critical flow type, in that the seal does not impede the flow of fluid through the tube or pipe.
The seals in accordance with the present invention may be formed from a variety of materials suitable for the purpose which the joint is to serve. Usually the seals will need to be resistant to petrol, oil or a hydraulic fluid. Examples of suitable materials from which the seals can be formed are Nylon 66, polytetrafluoroethylene, or a thermoplastic rubber material like that produced by Monsanto and marketed under the trade Mark SANTOPRENE, available as an 80
Shore durometer rubber.
One advantage of many seals in accordance with the present invention is that they can be used in conjunction with existing male or female fittings and sometimes the free end regions of the tube or pipe need not be modified at all although, as pointed out above, if the flow type is critical, it is sometimes necessary to modify the seal, like the third embodiment of seal illustrated in Figure 12, or to shorten part of the convex flare of the tube or pipe, as shown in Figure 5.
However, notwithstanding these relatively minor modifications, the seals and the tubes or pipes provided with the seals, in accordance with the present invention, can be used without any necessary modifications to the female fittings and nuts or to the male fitting, sleeve and nuts as shown in Figure 1 and in Figure 2 respectively. Also, it is not necessary to employ the considerably more expensive cold drawn seamless tube or pipe; instead the less expensive and previously less satisfactory double wall wrapped, or single wall butt welded, tube or pipe can be employed, any possible inherent seam separation occurring during forming generally not having an adverse affect on the sealing effect when employing a seal in accordance with the present invention.Thus, with the embodiments of the invention illustrated in the drawings it is possible to be more tolerant of surface defects on the metal surfaces which would abut each other were it not for the presence therebetween of the seal of the present invention. There is also generally the need to apply less torque when tightening the nut, than with the prior art arrangements of the type illustrated in
Figures 1, 2 and 3. In view of the reduction in torque required, the likelihood of any distortion of the flare is greatly reduced with the resultant advantage that dismantling difficulties are reduced or obviated.
Although, in the metal conduit art, the term "tube" is usually applied to a conduit having a diameter of 100 mm or less and the term "pipe" is usually applied to a conduit having a diameter of 100 mm or more, nevertheless these terms as used herein are not necessarily restricted to these dimensions.
Another advantage of the present invention is the simple way in which a seal in accordance with the present invention can be used deliberately to restrict in a fixed manner the bore of a joint and hence to control the fluid flow through the joint. This is achieved by the seal having a portion which projects into the flow path of the medium being transmitted through the joint.
Claims (15)
1. A seal intended for use with a tube or pipe having a flare at its free end region, which seal is generally annular and is optionally provided with one or more than one slot to allow the seal to be fitted more easily to the free end region of the tube or pipe, the seal having:
one portion which is flared and is intended to abut a corresponding flare of the tube or pipe; and
at least one other portion adjacent said one portion and intended to help locate the seal at the free end region of the tube or pipe.
2. A seal intended for use with a tube or pipe having a convex flare at its free end region, which seal is generally annular and is optionally provided with one or more than one slot to allow the seal to be fitted more easily to the free end region of the tube or pipe, the seal having:
a first part intended to be located within part of the convex flare at the free end region of the tube or pipe;
a second, generally cylindrical part adjacent the first part; and
a third part which is adjacent the second part but remote from the first part, the third part being intended to abut the free end part of the convex flare.
3. A seal according to claim 2, which has two or more slots in its first part.
4. A seal according to claim 3, which has two slots in its first part.
5. A seal intended for use with a tube or pipe having a flare at its free end region, which seal is generally annular and is optionally provided with one or more than one slot to allow the seal to be fitted more easily to the free end region of the tube or pipe, the seal having:
a first, generally cylindrical part intended to be located within the tube or pipe;
a second, flared part adjacent the first part and intended to lie against the flare of the tube or pipe; and
a third, generally radial part adjacent the second part but remote from the first part.
6. A seal according to claim 5, which has a plurality of slots.
7. A seal according to claim 6, wherein the slots are located in the first part of the seal.
8. A seal according to claim 7, wherein there are two diametrically opposed slots in the first part of the seal.
9. A seal intended for use with a tube or pipe having a flare at its free end region, which seal is generally annular and is optionally provided with one or more than one slot to allow the seal to be fitted more easily to the free end region of the tube or pipe, the seal having:
a first, generally flared part intended to abut the internal surface of the flare of the tube or pipe;
a second, intermediate part adjacent the first part and intended to abut the free end of the flare of the tube or pipe; and
a third part adjacent the second part but remote from the first part, the third part being generally parallel to the first part and intended to assist in locating the seal on the flare of the tube or pipe.
10. A seal according to claim 9, which has a plurality of slots.
11. A seal according to claim 10, wherein the slots are provided in the third part.
12. A seal according to claim 11, wherein there are four slots equidistantly spaced around the third part of the seal.
13. A seal according to claim 1, substantially as hereinbefore described with reference to, and as illustrated, Figure 6, Figure 8, Figure 10, or Figure 12 of the accompanying drawings.
14. A joint constituted by a tube or pipe provided with a flare, a fitting with a corresponding flare and to which the tube or pipe is to be joined, means for urging the tube or pipe towards the fitting, and, provided in the region of the flare of the tube or pipe, a seal as claimed in any one of claims 1 to 12.
15. A joint according to claim 14, substantially as hereinbefore described with reference to, and as illustrated in, Figure 4 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08715541A GB2207722A (en) | 1987-07-02 | 1987-07-02 | Seals for use in sealing tube and pipe joints |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08715541A GB2207722A (en) | 1987-07-02 | 1987-07-02 | Seals for use in sealing tube and pipe joints |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8715541D0 GB8715541D0 (en) | 1987-08-12 |
| GB2207722A true GB2207722A (en) | 1989-02-08 |
Family
ID=10619947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08715541A Withdrawn GB2207722A (en) | 1987-07-02 | 1987-07-02 | Seals for use in sealing tube and pipe joints |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2207722A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993008423A1 (en) * | 1991-10-25 | 1993-04-29 | Nwd Manufacturing, Inc. | Hydraulic port fittings |
| EP0593325A1 (en) * | 1992-10-16 | 1994-04-20 | Automobiles Peugeot | Coupling for a sealing ring |
| DE19511063A1 (en) * | 1994-05-07 | 1995-11-09 | Walterscheid Gmbh Jean | Pipe with a connection section for a pipe connection and method for producing the same |
| US5533765A (en) * | 1991-10-25 | 1996-07-09 | Nwd International, Inc. | Crimped tube-to-port hydraulic fittings |
| GB2296948A (en) * | 1995-01-11 | 1996-07-17 | Universal Enterprises Inc | High-temperature, double-bead, tube-fitting assembly |
| GB2347472A (en) * | 1998-12-28 | 2000-09-06 | Usui Kokusai Sangyo Kk | Flared connection joint of a pipe end |
| EP2392418A1 (en) * | 2010-06-01 | 2011-12-07 | AB Alvenius Industrier | A metal pipe for conducting a medium, a pipe arrangement and a method for manufacturing a metal pipe |
| WO2012142862A1 (en) * | 2011-04-20 | 2012-10-26 | Pang Haohui | Connection method for thin wall metal pipe and pipe joint |
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| GB953501A (en) * | 1961-07-18 | 1964-03-25 | Perrot Regnerbau Gmbh & Co | A releaseable coupling for thin-walled pipes |
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| GB1249839A (en) * | 1968-12-21 | 1971-10-13 | Luigi Bagnulo | Electrically insulating joint for metallic pipe lines |
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| US4029345A (en) * | 1974-05-20 | 1977-06-14 | Antonio Romanelli | Pipe fittings |
| EP0002071A1 (en) * | 1977-11-22 | 1979-05-30 | Kubota Limited | Synthetic resin pipe joint |
| GB2144508A (en) * | 1983-08-05 | 1985-03-06 | Paragon Plastics Limited | Pipe joints |
-
1987
- 1987-07-02 GB GB08715541A patent/GB2207722A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB809710A (en) * | 1956-11-07 | 1959-03-04 | Ladish Co | Sealed pipe joints |
| GB953501A (en) * | 1961-07-18 | 1964-03-25 | Perrot Regnerbau Gmbh & Co | A releaseable coupling for thin-walled pipes |
| GB1151130A (en) * | 1967-02-22 | 1969-05-07 | Ct De Rech S De Pont A Mousson | Improvements in or relating to a Sealing Element for a Pipe Joint and Joint including said Sealing Element. |
| GB1249839A (en) * | 1968-12-21 | 1971-10-13 | Luigi Bagnulo | Electrically insulating joint for metallic pipe lines |
| GB1436310A (en) * | 1972-08-11 | 1976-05-19 | British Steel Corp | Pipe joints and sealing members therefor |
| US4029345A (en) * | 1974-05-20 | 1977-06-14 | Antonio Romanelli | Pipe fittings |
| EP0002071A1 (en) * | 1977-11-22 | 1979-05-30 | Kubota Limited | Synthetic resin pipe joint |
| GB2144508A (en) * | 1983-08-05 | 1985-03-06 | Paragon Plastics Limited | Pipe joints |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5533765A (en) * | 1991-10-25 | 1996-07-09 | Nwd International, Inc. | Crimped tube-to-port hydraulic fittings |
| WO1993008423A1 (en) * | 1991-10-25 | 1993-04-29 | Nwd Manufacturing, Inc. | Hydraulic port fittings |
| US5516156A (en) * | 1991-10-25 | 1996-05-14 | Nwd International, Inc. | Hydraulic port fittings |
| US5533764A (en) * | 1991-10-25 | 1996-07-09 | Nwd International, Inc. | Transverse hydraulic coupling with lipped port |
| EP0593325A1 (en) * | 1992-10-16 | 1994-04-20 | Automobiles Peugeot | Coupling for a sealing ring |
| FR2697070A1 (en) * | 1992-10-16 | 1994-04-22 | Peugeot | O-ring fitting. |
| DE19511063A1 (en) * | 1994-05-07 | 1995-11-09 | Walterscheid Gmbh Jean | Pipe with a connection section for a pipe connection and method for producing the same |
| DE19511063C2 (en) * | 1994-05-07 | 2000-01-13 | Walterscheid Gmbh Jean | Pipe connection with a pipe with a connecting section and method for producing the same |
| GB2296948A (en) * | 1995-01-11 | 1996-07-17 | Universal Enterprises Inc | High-temperature, double-bead, tube-fitting assembly |
| GB2347472A (en) * | 1998-12-28 | 2000-09-06 | Usui Kokusai Sangyo Kk | Flared connection joint of a pipe end |
| FR2790536A1 (en) * | 1998-12-28 | 2000-09-08 | Usui Kokusai Sangyo Kk | COLLAR CONNECTION STRUCTURE OF A PIPE END |
| GB2347472B (en) * | 1998-12-28 | 2003-03-26 | Usui Kokusai Sangyo Kk | Flared connection structure of pipe end portion |
| DE19963206B4 (en) * | 1998-12-28 | 2004-02-26 | Usui Kokusai Sangyo Kaisha Ltd., Nagasawa | Connection arrangement for a pipe end area |
| EP2392418A1 (en) * | 2010-06-01 | 2011-12-07 | AB Alvenius Industrier | A metal pipe for conducting a medium, a pipe arrangement and a method for manufacturing a metal pipe |
| WO2012142862A1 (en) * | 2011-04-20 | 2012-10-26 | Pang Haohui | Connection method for thin wall metal pipe and pipe joint |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8715541D0 (en) | 1987-08-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |