GB2144072A - Method of forming a plug valve seal - Google Patents
Method of forming a plug valve seal Download PDFInfo
- Publication number
- GB2144072A GB2144072A GB08418459A GB8418459A GB2144072A GB 2144072 A GB2144072 A GB 2144072A GB 08418459 A GB08418459 A GB 08418459A GB 8418459 A GB8418459 A GB 8418459A GB 2144072 A GB2144072 A GB 2144072A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grooves
- seal
- plug body
- opening
- plug
- 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
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000013536 elastomeric material Substances 0.000 claims description 4
- 210000003414 extremity Anatomy 0.000 claims description 3
- 210000003141 lower extremity Anatomy 0.000 claims description 3
- 210000001364 upper extremity Anatomy 0.000 claims description 3
- 229920000459 Nitrile rubber Polymers 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000007767 bonding agent Substances 0.000 claims description 2
- 230000009969 flowable effect Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
Abstract
A method of forming a seal about the ends of an opening through a plug body of a plug valve comprises injecting an elastomeric seal material through passages (18) provided in the body and which communicate, via branch passages (19, 20, 21), with grooves (15, 16, 17) in the surface of the body about the ends of the opening (11). A removable mould about the body cooperates with the grooves whereby the injected seal matrial can set in the grooves to assume a profile determined by the mould. <IMAGE>
Description
SPECIFICATION
A method of forming a plug value seal
The present invention concerns a method of forming a seal about the ends of an opening through a plug body of a plug valve.
A parallel plug valve comprises a housing adapted to be located in a flow line and containing a plug body having an opening therethrough. The plug body is rotatable in the housing so as to move the opening between open and closed positions, that is a position at which flow can pass through the opening and a position at which the plug body obstructs flow. The prevent leakage around the plug body it is required to provide a seal between the body and the housing.
It is known to provide such a seal by fitting a preformed harness of elastomeric material in grooves formed in the plug body about the opening therein.
According to the present invention there is provided a method of forming a seal about the ends of an opening through a plug body of a plug valve, the method comprising providing upper and lower circumferential grooves in the body above and below the opening respectively and pairs of axial grooves in the body one at each side of the opening and in communication with the circumferential grooves, providing passages in the plug body in cpmmunication with the circumferential and axial grooves, arranging a mould about the plug body to cooperate with the grooves therein, injecting an elastomeric seal material into the grooves through the passages and allowing the injected seal material to set in the grooves to form a seal of a required shape and size about the opening in the plug body.
The invention will be described further, by way of example, with reference to the accompanying drawings; in which:
Figure 1 is a part sectional view of a plug valve assembly;
Figure 2 is an elevation of a plug body prior to the formation of the seals; and
Figure 3 is a section B-B in Fig. 2.
Fig. 1 shows a plug valve assembly for insertion in a pipeline and comprising a plug body 1 rotatably supported in a housing 2 by a linear 5, the housing having stubs 3 which are to be welded to the ends of pipes. A bonnet 6 is secured to the liner by capscrews 7, the bonnet 6 in turn being releasably secured to the housing by bonnet studs (not shown). A threaded shank 8 of the body extends through a bush 9 in the bonnet and is secured by a locknut 10. The plug body has an opening 11 therethrough to provide communication between the stubs 3 and hence the pipeline. In Fig. 1, the plug body is in a closed position with the opening 11 extending transversely across the flow path.
The plug body 1 is formed with a seal 12 of elastomeric material which extends about the opening 11 and as shown in Fig. 1. The seal 12 is located in grooves in the plug body and with reference to Figs. 2 and 3 it can be seen that the plug body is provided with upper and lower circumferential grooves 15 and 16 respectively which are joined by four vertical grooves 17, the latter being disposed symmetrically about the opening through the body. The arrangement is such that the grooves 15, 16 and 17 encircle the opening 11 through the plug body 1.
Four passages 18 (only one of which is shown in Fig. 3) are drilled in the plug body to extend parallel to the longitudinal axis and, at positions adjacent to the vertical grooves 17 in the surface of the body. Branch passages lead from the passages 18 to open into the grooves 15, 16 and 17. Conveniently, four branch passages 19 lead from each vertical passage 18 to open into the adjacent vertical groove 17. Further branch passages 20 and 21 adjacent each end of each passage 18 communicate with the upper and lower circumferential grooves 15 and 16.
The seal to be located in the grooves can by any desired shape, size and material. Conveniently, the seal received in the grooves can be
E-shape in cross-section and as indicated within the encricled portion in Fig. 2. Preferably the centre limb of the E extends outwardly beyond the upper and lower limbs thereof and beyond the surface of the plug body. The seal is formed by arranging an appropriate mould about the plug body and introducing the seal material into the grooves 15, 16 and 17 through the passages 18 and the branch passages 19, 20 and 21. The seal material, for example nitrile rubber, is initially at an elevated temperature, for example in the region of 1 50 C, to maintain it in a flowable state capable of flowing under pressure along the passages and branch passages into the grooves. The material is injected into the grooves under pressure. The seal material is then allowed to set, solidify and vulcanise to be bonded in the grooves before removal of the mould. Prior to injection of the seal material a bonding agent, compatible with the plug body and the seal material, can be applied to the grooves to allow the seal material to be bonded in the grooves. The ends of the passages 18 can be closed by metal plugs after injection of the seal material. The resulting seal exhibits low operating torque characteristics with high sealing pressure. A lubricant can be applied to the surfaces of the seal.
The plug body 1 is readily removable and replaceable for ease of maintenance and testing.
1. A method of forming a seal about the
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. A method of forming a seal about the ends of an opening through a plug body of a plug valve comprises providing upper and lower circumferential grooves in the body above and below the opening respectively and pairs of axial grooves in the body one at each side of the opening and in communication with the circumferential grooves, providing passages in the plug body in communication with the circumferential and axial grooves, arranging a mould about the plug body to cooperate with the grooves therein, injecting an elastomeric seal material into the grooves through the passages and allowing the injected seal material to set in the grooves to form a seal of a required shape and size about the opening in the plug body.
2. A method as claimed in claim 1 which comprises closing the ends of the passages after injection of the seal material.
3. A method as claimed in claim 1 or 2 which comprises forming the seal with a substantially E-shaped cross-section and with the centre limb of the E extending beyond the upper and lower limbs thereof.
4. A method of forming a seal about the ends of an opening through a plug body of a plug valve substantially as herein described with reference to the accompanying drawings.
5. A plug valve having a seal which is formed by the method as claimed in any preceding claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08418459A GB2144072B (en) | 1983-07-29 | 1984-07-19 | Method of forming a plug valve seal |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB838320506A GB8320506D0 (en) | 1983-07-29 | 1983-07-29 | Plug valve |
| GB08418459A GB2144072B (en) | 1983-07-29 | 1984-07-19 | Method of forming a plug valve seal |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8418459D0 GB8418459D0 (en) | 1984-08-22 |
| GB2144072A true GB2144072A (en) | 1985-02-27 |
| GB2144072B GB2144072B (en) | 1986-06-11 |
Family
ID=26286709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08418459A Expired GB2144072B (en) | 1983-07-29 | 1984-07-19 | Method of forming a plug valve seal |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2144072B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2066674A2 (en) * | 1992-07-20 | 1995-03-01 | Agullo Pablo Fominaya | Improvements to the manufacture of taps for fluids |
-
1984
- 1984-07-19 GB GB08418459A patent/GB2144072B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2066674A2 (en) * | 1992-07-20 | 1995-03-01 | Agullo Pablo Fominaya | Improvements to the manufacture of taps for fluids |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2144072B (en) | 1986-06-11 |
| GB8418459D0 (en) | 1984-08-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990719 |