GB2112482A - Pipe joint - Google Patents
Pipe joint Download PDFInfo
- Publication number
- GB2112482A GB2112482A GB08138541A GB8138541A GB2112482A GB 2112482 A GB2112482 A GB 2112482A GB 08138541 A GB08138541 A GB 08138541A GB 8138541 A GB8138541 A GB 8138541A GB 2112482 A GB2112482 A GB 2112482A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pipes
- joint
- pipe
- low friction
- bush
- 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- Withdrawn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
- 229920000642 polymer Polymers 0.000 claims abstract description 15
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 5
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000000945 filler Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000004642 Polyimide Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 230000000063 preceeding effect Effects 0.000 claims 1
- 229940058401 polytetrafluoroethylene Drugs 0.000 description 3
- 239000003350 kerosene Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
Classifications
-
- 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
- F16L27/00—Adjustable joints; Joints allowing movement
- F16L27/02—Universal joints, i.e. with mechanical connection allowing angular movement or adjustment of the axes of the parts in any direction
- F16L27/04—Universal joints, i.e. with mechanical connection allowing angular movement or adjustment of the axes of the parts in any direction with partly-spherical engaging surfaces
- F16L27/06—Universal joints, i.e. with mechanical connection allowing angular movement or adjustment of the axes of the parts in any direction with partly-spherical engaging surfaces with special sealing means between the engaging surfaces
- F16L27/073—Universal joints, i.e. with mechanical connection allowing angular movement or adjustment of the axes of the parts in any direction with partly-spherical engaging surfaces with special sealing means between the engaging surfaces one of the cooperating surfaces forming the sealing means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints With Sleeves (AREA)
Abstract
A joint between two pipes (10,13) which are in flow series includes a bush (12) formed from a low friction elastomeric polymer, such as polytetrafluoroethylene, which is sealingly engaged in one end of one of the pipes (10). The other pipe (13) has a part spherical end portion (14) which is slidingly engaged in the bore (15) of the bush (12) so as to be a sealing interference fit therein. <IMAGE>
Description
SPECIFICATION
Pipe joint
This invention relates to pipe joints and in particular to pipe joints which are articulated.
It is often necessary to introduce a certain degree
of articulation into joints between pipes which are in flow series so as to provide for relative movement
between the pipes. Such relative movement usually
results from differing rates of thermal expansion of the structure to which the pipes are attached or from vibration. One way of achieving such articulation is to provide a section of flexible pipe between two
rigid pipes. This, however, usually results in a heavy and bulky joint. Other joints have been suggested which do not make use of flexible pipes but these often suffer from leakage problems.
It is an object of the present invention to provide a joint between pipes in flow series which is resistant to leaking and provides for both articulation and
relative sliding movement beween the pipes.
According to the present invention, a joint between two pipes in flow series comprises a bush formed from a low friction elastomeric polymer which is sealingly engaged in the end of one of said pipes, the other pipe having an end portion which is of part-spherical form, the outer diameter of which end portion is greater than that of its associated pipe, and which is slidingly engaged in the bore of said bush so as to be a sealing interference fit therein, the diameter of said bore being greater than the outer diameter of said other pipe.
Said low friction elastomeric polymer may be polytetrafluororoethylene.
Said low friction elastomeric polymer may alternatively be a polyimide.
Said low friction elastomeric polymer may contain a filler which enhances the low friction properties of said polymer.
Said filler may be graphite.
The invention will now be described, by way of example, with reference to the accompanying drawing which is a sectional side view of a pipe joint in accordance with the present invention.
With reference to the drawing, a pipe 10 is provided with an end portion 11 having an internal diameter which is greater than that of the remainder of the pipe 10. A bush 12 is engaged within the pipe end portion 11. The outer diameter of the bush 12 is slightly greater than the internal diameter of pipe end portion 11 so that there is an interference fit between them, thereby ensuring retention of the bush 12 in sealing engagement with the pipe end portion 11.
A second pipe 13 is provided with an end portion 14 which is of part spherical form. The part-spherical end portion 14 is of greater outer diameter than that of the pipe 13 and is slidingly located within the bore 15 of the bush 12. Its outside diameter is also slightly greater than the diameter of the bush bore 15 so that a seal is provided between them.
The bush bore 15 diameter is, however, greater than the outer diameter of the pipe 13.
Sliding movement between the part-spherical end
portion 14 and the bush 12, and indeed articulation
between the pipes 10 and 13 is possible by virtue of
the fact that the bush 12 is formed from a low
fricition elastomeric polymer, namely polytetraf
luoroethylene. However other low friction elas
tomeric polymers, such as polyimides, could be
employed in place of the polytetrafluoroethylene.
Moreover enhancement of the low friction prop
erties of the polymer could be provided by the
incorporation of a low friction filler, such as graphite,
into the polymer. Thus mention may be made of
Vespel SP21 (Du Font (UK) Ltd) and Graflon HY22
(Morganite Special Carbons Ltd.) graphite filled
polyimide and polytetrafluoroethylene respectively
as suitable materials from which the bush 12 may be formed.
In order to investigate the operation of a pipe joint
in accordance with the present invention, a joint as described above with a bush 12 formed from polyetrafluoroethylene was pressure tested, firstly with air and secondly with kerosene. Air at 85 psi was passed through the tubes 10 and 13 whilst the joint was held under water. No evidence of leakage was observed. After removal of the joint from the water, kerosene at 800 psi was passed through the tubes 10 and 13. Again no evidence of leakage was observed. Examination of the joint revealed that both sliding movement and articulation were possible between the pipes 10 and 13.
It will be seen therefore that the pipe joint in accordance with the present invention is resistant to leakage but nevertheless permits limited relative movement between the pipes 10 and 13, thereby making it particularly useful in applications in which limited relative movement resulting from vibration and/orthermal expansion is encountered by pipes carrying pressurised fluid.
Claims (6)
1. A joint between two pipes in flow series comprising a bush formed from a low friction elastomeric polymer which is sealingly engaged in one end of one of said pipes, the other pipe having an end portion which is of part spherical form, the outer diameter of which end portion is greater than that of its associated pipe and which is slidingly engaged in the bore of said bush so as to be a sealing interference fit therein, the diameter of said bore being greater than the outer diameter of said other pipe.
2. A joint between two pipes as claimed in claim 1 wherein said low friction elastomeric polymer is polytetrafluoroethylene.
3. A joint between two pipes as claimed in claim 1 wherein said low friction elastomeric polymer is a polyimide.
4. A joint between two pipes as claimed in any one preceeding claim wherein said low friction elastomeric polymer contains a filler which enhances the low friction properties of said polymer.
5. A joint between two pipes as claimed in claim 4 wherein said filler is graphite.
6. A joint between two pipes substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08138541A GB2112482A (en) | 1981-12-22 | 1981-12-22 | Pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08138541A GB2112482A (en) | 1981-12-22 | 1981-12-22 | Pipe joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2112482A true GB2112482A (en) | 1983-07-20 |
Family
ID=10526761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08138541A Withdrawn GB2112482A (en) | 1981-12-22 | 1981-12-22 | Pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2112482A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010004321A1 (en) * | 2008-07-10 | 2010-01-14 | Airbus Operations Ltd | A connector for an aircraft fuel pipe |
| WO2016033091A1 (en) * | 2014-08-28 | 2016-03-03 | Caterpillar Inc. | Hose coupling with ball swivel joint |
-
1981
- 1981-12-22 GB GB08138541A patent/GB2112482A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010004321A1 (en) * | 2008-07-10 | 2010-01-14 | Airbus Operations Ltd | A connector for an aircraft fuel pipe |
| US9506587B2 (en) | 2008-07-10 | 2016-11-29 | Airbus Operations Limited | Connector for an aircraft fuel pipe |
| WO2016033091A1 (en) * | 2014-08-28 | 2016-03-03 | Caterpillar Inc. | Hose coupling with ball swivel joint |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US1821274A (en) | Flexible pipe-joint | |
| US4054306A (en) | Tube and cylindrical surface sealing apparatus | |
| JP2740076B2 (en) | Flexible coupling device | |
| US2481404A (en) | Hydraulic fitting | |
| RU2397396C1 (en) | Rotary high presuure compensator used in pipe | |
| JPH07508086A (en) | flexible connector assembly | |
| CA1222785A (en) | Seal construction for fluid swivel joints | |
| JPS63503320A (en) | sealing device | |
| US3306636A (en) | Flexible pressure-compensated pipe coupling | |
| US2793883A (en) | Flexible joint for rigid tubes | |
| US5503438A (en) | Flared tube coupling having a disposable sealing boot | |
| EP1314917A2 (en) | Seal ring and seal structure at flange joint used for composite tanks and pipes | |
| US262581A (en) | doolittle | |
| ATE137851T1 (en) | SEAL, ESPECIALLY FOR FLANGE CONNECTIONS | |
| US2364447A (en) | Pressure joint for tubes | |
| US2342422A (en) | High pressure joint | |
| US3840257A (en) | Sealed connector | |
| GB2112482A (en) | Pipe joint | |
| US979513A (en) | Flexible pipe-joint. | |
| US5639102A (en) | Seal arrangement for sealing a conduit | |
| NO137400B (en) | RING-SHAPED GASKET. | |
| US5570891A (en) | Toric joints having an alternating diameter for use in a packing box | |
| JPS5993588A (en) | Vibration-damping coupling | |
| US3606400A (en) | Pipe connector | |
| GB2242530A (en) | Pressure testing of pipeline welds |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |