GB2103743A - Pressure-tight pipe connections - Google Patents
Pressure-tight pipe connections Download PDFInfo
- Publication number
- GB2103743A GB2103743A GB08208833A GB8208833A GB2103743A GB 2103743 A GB2103743 A GB 2103743A GB 08208833 A GB08208833 A GB 08208833A GB 8208833 A GB8208833 A GB 8208833A GB 2103743 A GB2103743 A GB 2103743A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spigot
- intermediate ring
- recess
- assembled
- conical surface
- 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.)
- Granted
Links
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
- 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
- F16L19/04—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 using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection
- F16L19/043—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 using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection with additional sealing means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints With Pressure Members (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Bolts, Nuts, And Washers (AREA)
- Transplanting Machines (AREA)
- Gasket Seals (AREA)
Abstract
A pressure-tight pipe connection comprises a threaded spigot 2 having a conical recess 6 tapering from an end face thereof to a cylindrical bore 7 extending to a radially projecting shoulder 5 adjacent a through bore 18 of the spigot, a cap screwable 13 on the spigot, and an intermediate ring 1 with a conical surface 25 which, in use, abuts against the inner surface 17 of a flanged end of a pipe 16, the conical surface merging into an oppositely inclined conical surface 3 which abuts the conical recess 6 of the threaded spigot. The intermediate ring 1 has one or more deformable lips 4 adjacent a recess 9 at the end of the conical surface 3 which faces the threaded spigot 2, the lip or lips 4 having a radius (R1) which is greater than the radius (r1) of the cylindrical bore 7 of the spigot 2, and the recess 9 is dimensional so that the sealing lip can be pressed into it when the lip is being deformed during assembly. <IMAGE>
Description
SPECIFICATION
Screwing system for forming pressure-tight pipe connections
The invention relates to a screwing system for connecting a pipe in pressure-tight manner, comprising a threaded spigot having a conical recess tapering from an end face thereof to a cylindrical bore extending to a radially projecting abutment or shoulder adjacent a through bore of the spigot bore, a screw cap screwable on the spigot, and an intermediate ring having a conical surface which, when assembled, abuts the inner surface of a flanged end of a pipe, the conical surface merging into an oppositely inclined conical surface which, when assembled, abuts the conical recess of the threaded spigot.
A screwing system of this kind is known e.g. of
German OS 26 23 157. In the known screwing system, to prevent unacceptable widening of the screwing member or spigot, the intermediate ring, starting from the maximum diameter of the outer cone facing the threaded spigot, has an abutment surface extending at right angles to its axis and cooperating with the end face of the spigot. In order to seal the known screwing system, an annular groove for receiving an 0-ring must be formed on at least one conical surface of the intermediate member. The object of the known system is to ensure that when the screw cap is tightened the axial travel of the intermediate ring and consequently of the pipe is limited, so that the pipe is not as normally stretched and the flanged cone of the pipe is not deformed.The known embodiment is also designed to prevent the intermediate ring from being pushed into the conical recess of the spigot so as to widen it unacceptably.
A disadvantage of the known embodiment, is that the end face of the intermediate ring must not bear flush against the inner abutment surface of the spigot. The result is an annular groove which causes turbulence in the flow medium, thus interfering with the flow. All the embodiments of the noted German Specification have the further disadvantage that the intermediate ring must have at least one annular groove for receiving an O-ring to obtain adequate sealing-tightness in the system. When the sealing requirements are more severe, two O-ring seals need be provided, resulting in additional machining and assembly costs. In addition, a system comprising O-ring seals made of plastics or rubber cannot be used at higher temperatures or for certain media which corrode the O-ring material.Another disadvantage of the known system is that the intermediate rings cannot be made undetachable from the spigot, and there may therefore be difficulties in assembling or dismantling the screwing system. In addition the means for holding the intermediate ring must be adapted to the internal diameter of the pipe, depending on the wall thickness thereof.
US Patent Specification 2 332 357 discloses a screwing system for pressure-tight connection of a pipe, comprising a threaded spigot in which an undetechable intermediate ring is used. The intermediate ring is either welded to the threaded nozzle or connected thereto by a deformable lip, which is pressed into a relieved bore in the spigot.
Before being assembled, the lip of the intermediate ring is directed radially towards the central axis of the ring. The deformable lip is disposed adjacent a thin portion of the wall at the end of a conical surface which, when assembled, is adjacent the threaded spigot. The conical recess in the spigot extends into the relieved bore as far as the radial spigot. After the intermediate ring has been positioned in the bore, therefore, it is necessary to press the radially inwardly extending lip of the intermediate ring into the relieved bore, using a tool. It is difficult to provide a relieved bore in a threaded spigot and in addition a special tool is needed to press the lips into the relieved bore.
An object of the invention, therefore, is to provide a screwing system comprising an intermediate ring which is undetachable and, even when providing very high sealing-tightness, does not need O-ring or other seals of or with plastics or rubber components. Another object of the system is to make it jar-proof and vibration-proof, enable it to be centrally assembled without special tools, and provide favourable flow conditions via the bore cross-section at the transition in the neighbourhood of the screwing system.
According to the invention, there is provided a screwing system for connecting a pipe in pressure-tight manner, comprising a threaded spigot having a conical recess tapering from an end face thereof to a cylindrical bore which extends to a radially projecting abutment or shoulder adjacent a through bore of the spigot, a screw cap screwable on the spigot, and an intermediate ring having a conical surface which, when assembled, abuts the inner surface of a flanged end of a pipe, the conical surface merging into an oppositely inclined conical surface which, when assembled, abuts the conical recess of the threaded spigot, wherein the intermediate ring has one or more deformable sealing lips adjacent a recess at the end of the conical surface which, when assembled, faces the threaded spigot, the deformable sealing lip having a radius greater than the radius of said cylindrical bore and the recess is dimensioned so that the sealing lip can be pressed thereinto when the lip is deformed during assembly of the system.
In an embodiment of the invention, the intermediate ring has a deformable milled portion extending axially at the periphery behind a recess at the end of a conical surface which, when assembled, faces the conical recess in the threaded spigot, the milled portion thus forming axial sealing lips. The radius of the intermediate ring near and including the milled portion is greater than the radius of the cylindrical bore of the spigot between the radial projection and the conical bore. According to another advantageous feature of the invention, a soldering ring is
disposed before assembly on the abutment of the threaded spigot, so that after pressing-in and soldering, there is a completely metal connection between the intermediate ring and the conical recess in the threaded spigot.
Advantageously, in order to further improve the metal seal between the intermediate ring and the threaded spigot, the end face of the side of the intermediate ring facing the spigot when assembled is given the shape of a ridged roof.
Preferably to provide favourable flow conditions at the transition, the bore in the intermediate ring has a trumpet-like widened portion at the end which, when assembled, faces the screw cap.
Embodiments of the invention will be described in detail with reference to the accompanying drawings, in which:
Fig. 1 shows the screwing system, comprising a screw cap, an intermediate ring, a threaded spigot, a thrust ring and a pipe component before assembly, shown in axial section and in side view;
Fig. 2 shows the components of a screwing system in Fig. 1 after assembly;
Fig. 3 shows an embodiment of an intermediate ring in axial section and in side view and
Fig. 4 shows another embodiment of an intermediate ring in axial section and in side view.
Fig. 1 shows the screwing system before pressing in the intermediate ring 1, the top half of
Fig. 1 being a section and the bottom half being a side view. The screwing system comprises a threaded spigot 2, the previously-mentioned intermediate ring 1, a screw cap 13 and pressure ring 15, and a pipe 16 to the connected, the pipe having a flanged portion 17.
The flanged spigot 2 has a conical recess 6 which tapers to a cylindrical bore 7 extending to a shoulder or radial abutment 5 followed by a bore 18 as shown.
Cap 1 3 has an inner threaded 1 9 which can be screwed on to an outer threaded 20 of spigot 2.
The inner thread 1 9 is followed by a cylindrical part 22 ending in a shoulder or radial inward projection 21. When the device is assembled, abutment 21 bears against an abutment 23 of thrust ring 1 5, the opposite side of which has a conical surface 24 abutting the flanged outer surface of pipe 16.
Ring 1 has a sealing lip 4 at the end of its conical surface which, when assembled, faces spigot 2. Lip 4 has a radius R, greater than the radius r, of the cylindrical bore 7 of spigot 2. A recess 9 formed in front of lip 4 is dimensioned so that lip 4 is pressed into it when deformed during the assembly process. The end face 12 (see Fig. 3) of that side of ring 1 which, when assembled, faces spigot 2 is shaped rather like a ridged roof.
The bore of ring 1 has a trumpet-shaped flared part at the end 14 which, when assembled, faces screw cap 13.
Fig. 2 shows the components of Fig. 1 when the system is assembled. The inner thread 1 9 of cap 13 is screwed on to the outer thread 20 of spigot 2. During assembly the sealing lip 4 (shown in chain lines) of ring 1 is pressed into recess 9, thus producing a metal seal at this place between ring 1 and spigot 2. During the assembly process also, the ridged roof-like end face 12 is pressed against abutment 5 of spigot 2, thus producing a radial metal seal here, whereas the deformed lip 4 constitutes an axial metal seal. When assembled, the conical surface 35 of ring 1 presses against the flanged inner surface 17 of pipe 16, which in turn presses via ring 15 against the abutment on the screw cap.
The result of pressing and deforming lip 4 against the cylindrical bore 7 is not only a metal seal for high or very high pressure, but also provides that ring 1 is undetachably secured to spigot 2. There is no need for plastics or rubber or similar O-ring seals, so that the screwing system is particularly suitable for high temperatures and corrosive media where plastics and rubber cannot be used. The axial metal seal 4, which is supplemented by the metal seal between end face 12 and abutment 5, provides a jar-proof and vibration-proof connection. The conical surface 3 of intermediate ring 1, e.g. a 240 cone, also prevents cone 6 from being constricted during the assembly process, thus preventing any bulging or unintentional deformation. The conical surfaces 3 and 25 of ring 1 also guarantee central fitting.The trumpet-shaped widened portion 14 of the bore of ring 1 , at the end facing cap 13 in the assembled state, ensures good flow conditions at the transition, preventing turbulence or the accumulation of dirt.
Fig. 3, for clarity, shows the intermediate ring on a somewhat larger scale. The components have the same reference numbers as in Figs. 1 and 2.
Fig. 4 shows another embodiment of the invention comprising an intermediate ring 11 which, at the end of its conical surface 3, which when assembled faces the conical recess 6 in spigot 2, has a milled portion 10 extending axially around the periphery of ring 11 and forming a number of sealing lips. Spigot 2 presses ring 11 via the sealing lips or milled portion 10, thus producing a metal axial seal between portion 10 and the cylindrical bore 7 of the spigot 2. The radius R3 at the end of ring 1 1, near and including portion 10, is greater than the radius r1 of the cylindrical bore 7 between abutment 5 and bore 6, so that corresponding pressure is produced.
Before assembly, a solder ring 26 is inserted on abutment 5, so that any spaces left between the individual sealing lips or tips of the milled portion are filled with solder by capillary action during the soldering process. In the last-mentioned embodiment also, the end face of ring 1 1 may be shaped like a ridged roof, so as to produce a radial metal seal with abutment 5 during the assembly or pressure process.
The illustrated embodiment of rings 1 and 11 may be pressed against the threaded spigot 3 at the factory, thus non-detachably securing them to the spigot 2, so that only one bearing component for producing the sealing system will be needed at the assembly site.
Claims (6)
1. A screwing system for connecting a pipe in pressure-tight manner, comprising a threaded spigot having conical recess tapering from an end face thereof to a cylindrical bore which extends to a radially projecting abutment or shoulder adjacent a through bore of the spigot, a screw cap screwable on the spigot, and an intermediate ring having a conical surface which, when assembled, abuts the inner surface of a flanged end of a pipe, the conical surface merging into an oppositely inclined conical surface which, when assembled, abuts the conical recess of the threaded spigot, wherein the intermediate ring has one or more deformable sealing lips adjacent a recess at the end of the conical surface which, when assembled, faces the threaded spigot, the deformable sealing lip having a radius greater than the radius of said cylindrical bore and the recess is dimensioned so that the sealing lip can be pressed thereinto when the lip is deformed during assembly of the system.
2. A system according to Claim 1, wherein the intermediate ring has a deformable milled portion extending axially at the periphery behind the recess and at the end of said conical surface which, when assembled, faces the conical recess in the threaded spigot, and the radius of the intermediate ring at its end near and including the milled portion is greater than the radius of said cylindrical bore of the spigot.
3. A system according to Claim 2, wherein a soldering ring is disposed, before assembly, on the radially projecting abutment of the threaded spigot.
4. A screwing system according to any one of
Claims 1, 2 and 3, wherein the end face of the side of the intermediate ring facing the spigot, when assembled, has the shape of a ridged roof.
5. A system according to any one of Claims 1 to 4, wherein the bore of the intermediate ring has a trumpet-lika widened portion at the end thereof which, when assembled, faces the screw cap.
6. A screwing system for connecting a pipe in a pressure-tight manner substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3130922A DE3130922C1 (en) | 1981-08-05 | 1981-08-05 | Screw system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2103743A true GB2103743A (en) | 1983-02-23 |
| GB2103743B GB2103743B (en) | 1985-02-06 |
Family
ID=6138605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08208833A Expired GB2103743B (en) | 1981-08-05 | 1982-03-25 | Pressure-tight pipe connections |
Country Status (16)
| Country | Link |
|---|---|
| JP (1) | JPS5828086A (en) |
| AT (1) | AT386062B (en) |
| BE (1) | BE893026A (en) |
| BR (1) | BR8204589A (en) |
| CH (1) | CH657436A5 (en) |
| DE (1) | DE3130922C1 (en) |
| DK (1) | DK155345C (en) |
| ES (1) | ES274655Y (en) |
| FI (1) | FI70079C (en) |
| FR (1) | FR2511114B1 (en) |
| GB (1) | GB2103743B (en) |
| IT (2) | IT8209486A1 (en) |
| NL (1) | NL8201235A (en) |
| NO (1) | NO157950C (en) |
| SE (1) | SE450522B (en) |
| ZA (1) | ZA822531B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201600116968A1 (en) * | 2016-11-18 | 2018-05-18 | Enea Agenzia Naz Per Le Nuove Tecnologie Lenergia E Lo Sviluppo Economico Sostenibile | DEVICE FOR JUNCTION COMPRESSION OF THIN WALL PIPES |
| CN110030443A (en) * | 2019-05-17 | 2019-07-19 | 杭州科百特过滤器材有限公司 | Sealing duct connector |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60128086U (en) * | 1984-02-08 | 1985-08-28 | 豊田工機株式会社 | Fluid pipe connection device |
| JPS6387388U (en) * | 1986-11-28 | 1988-06-07 | ||
| JPH088380Y2 (en) * | 1991-12-09 | 1996-03-06 | 日本ピラー工業株式会社 | Pipe joint structure |
| JP2022017782A (en) * | 2020-07-14 | 2022-01-26 | 日本ピラー工業株式会社 | Inner ring and pipe joint |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7116986U (en) * | 1971-07-29 | Ati Gmbh | Pipe union for high pressure lines | |
| US821564A (en) * | 1905-09-13 | 1906-05-22 | Modern Improvements Mfg Co | Coupling for pipes and tubes. |
| US2011433A (en) * | 1933-03-25 | 1935-08-13 | Michigan Steel Casting Company | Pipe coupling |
| US2332354A (en) * | 1941-10-03 | 1943-10-19 | Weatherhead Co | Tube coupling and method of making same |
| US2529534A (en) * | 1946-03-20 | 1950-11-14 | Weatherhead Co | Adapter |
| DE816178C (en) * | 1950-04-01 | 1951-10-08 | Ermeto G M B H | Insert sleeve for reinforcing pipe ends |
| CH498332A (en) * | 1969-10-24 | 1970-10-31 | Fischer Ag Georg | Pipe connection |
| DE2244862B1 (en) * | 1972-09-13 | 1973-12-06 | Jean Walterscheid Gmbh, 5204 Lohmar | SCREW CONNECTION |
| DE2623157A1 (en) * | 1976-05-22 | 1977-11-24 | Walterscheid Gmbh Jean | SCREW CONNECTION |
| DE2816132A1 (en) * | 1978-04-14 | 1979-10-25 | Walterscheid Gmbh Jean | SCREW CONNECTION |
-
1981
- 1981-08-05 DE DE3130922A patent/DE3130922C1/en not_active Expired
-
1982
- 1982-03-25 GB GB08208833A patent/GB2103743B/en not_active Expired
- 1982-03-25 NL NL8201235A patent/NL8201235A/en not_active Application Discontinuation
- 1982-04-09 AT AT0142982A patent/AT386062B/en not_active IP Right Cessation
- 1982-04-14 ZA ZA822531A patent/ZA822531B/en unknown
- 1982-04-29 BE BE0/207968A patent/BE893026A/en not_active IP Right Cessation
- 1982-05-14 FR FR8208420A patent/FR2511114B1/en not_active Expired
- 1982-05-26 CH CH3227/82A patent/CH657436A5/en not_active IP Right Cessation
- 1982-05-27 SE SE8203309A patent/SE450522B/en not_active IP Right Cessation
- 1982-06-10 FI FI822064A patent/FI70079C/en not_active IP Right Cessation
- 1982-06-28 DK DK288682A patent/DK155345C/en not_active IP Right Cessation
- 1982-07-27 JP JP57129719A patent/JPS5828086A/en active Granted
- 1982-08-03 NO NO822655A patent/NO157950C/en unknown
- 1982-08-04 IT IT1982A09486A patent/IT8209486A1/en unknown
- 1982-08-04 BR BR8204589A patent/BR8204589A/en unknown
- 1982-08-04 IT IT09486/82A patent/IT1192489B/en active
- 1982-08-04 ES ES1982274655U patent/ES274655Y/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201600116968A1 (en) * | 2016-11-18 | 2018-05-18 | Enea Agenzia Naz Per Le Nuove Tecnologie Lenergia E Lo Sviluppo Economico Sostenibile | DEVICE FOR JUNCTION COMPRESSION OF THIN WALL PIPES |
| WO2018092081A1 (en) * | 2016-11-18 | 2018-05-24 | ENEA - Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile | A device for compression junction of thin-wall pipes |
| CN110030443A (en) * | 2019-05-17 | 2019-07-19 | 杭州科百特过滤器材有限公司 | Sealing duct connector |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA142982A (en) | 1987-11-15 |
| AT386062B (en) | 1988-06-27 |
| JPS6110711B2 (en) | 1986-03-31 |
| IT8209486A1 (en) | 1984-02-04 |
| IT1192489B (en) | 1988-04-13 |
| BE893026A (en) | 1982-08-16 |
| DK288682A (en) | 1983-02-06 |
| CH657436A5 (en) | 1986-08-29 |
| SE8203309L (en) | 1983-02-06 |
| ZA822531B (en) | 1983-02-23 |
| ES274655U (en) | 1984-10-16 |
| DE3130922C1 (en) | 1982-12-09 |
| DK155345C (en) | 1989-10-23 |
| FR2511114B1 (en) | 1986-11-21 |
| DK155345B (en) | 1989-03-28 |
| FI822064L (en) | 1983-02-06 |
| NO157950C (en) | 1988-06-15 |
| GB2103743B (en) | 1985-02-06 |
| ES274655Y (en) | 1985-04-16 |
| IT8209486A0 (en) | 1982-08-04 |
| FI822064A0 (en) | 1982-06-10 |
| FI70079B (en) | 1986-01-31 |
| NO822655L (en) | 1983-02-07 |
| NL8201235A (en) | 1983-03-01 |
| SE450522B (en) | 1987-06-29 |
| NO157950B (en) | 1988-03-07 |
| JPS5828086A (en) | 1983-02-18 |
| FR2511114A1 (en) | 1983-02-11 |
| BR8204589A (en) | 1983-07-26 |
| FI70079C (en) | 1986-09-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6435568B1 (en) | Tube joint having tightening member for accommodating tubes of varying wall thickness | |
| US6193239B1 (en) | Tube joint | |
| EP0915283B1 (en) | A pipe joint made of resin | |
| US3972547A (en) | Locking and nonseal joint device | |
| US5489127A (en) | Mounting apparatus with reduced resistance bead seal | |
| KR930001669B1 (en) | Cantilever lip conduit coupling menber and assembly | |
| EP0855546B1 (en) | Tube joint | |
| US3250550A (en) | Self-flaring tube coupling | |
| US2152537A (en) | Detachable fitting | |
| CA2025655A1 (en) | Quick connect fitting | |
| US4836583A (en) | Pipe connection for instruments or machines | |
| US20040239110A1 (en) | Support sleeve for use in a tube coupling and a coupling housing for use together with said sleeve | |
| US4950002A (en) | Screw seal | |
| KR20070046145A (en) | Metallic cutting ring | |
| US5658025A (en) | Flare-tube assembly | |
| US4296954A (en) | Pipe coupling and pipe joint connection | |
| GB2103743A (en) | Pressure-tight pipe connections | |
| US3420274A (en) | Tube end fitting | |
| US6860522B1 (en) | Connector fitting for a high pressure hose | |
| EP0811127B1 (en) | A pipe coupling and a method for securing a pipe to a coupling piece | |
| KR970028028A (en) | Tube joint | |
| EP0945663A2 (en) | A clamping ring coupling | |
| GB2197410A (en) | Pipe coupling | |
| JPS608226Y2 (en) | pipe fittings | |
| JPH08277982A (en) | Flareless type pipe joint |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930325 |