GB2484338A - Valve seal - Google Patents
Valve seal Download PDFInfo
- Publication number
- GB2484338A GB2484338A GB1016971.2A GB201016971A GB2484338A GB 2484338 A GB2484338 A GB 2484338A GB 201016971 A GB201016971 A GB 201016971A GB 2484338 A GB2484338 A GB 2484338A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- seal
- shaft
- valve body
- annular
- 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
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 7
- 239000012779 reinforcing material Substances 0.000 claims abstract description 6
- 239000000945 filler Substances 0.000 claims abstract description 5
- 239000011230 binding agent Substances 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 229920003235 aromatic polyamide Polymers 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000004760 aramid Substances 0.000 claims description 2
- 230000004323 axial length Effects 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000010425 asbestos Substances 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 229910052895 riebeckite Inorganic materials 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2268—Sealing means for the axis of rotation
-
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/20—Packing materials therefor
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
- F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing
- F16K41/043—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing for spindles which only rotate, i.e. non-rising spindles
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
- F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing
- F16K41/043—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing for spindles which only rotate, i.e. non-rising spindles
- F16K41/046—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing for spindles which only rotate, i.e. non-rising spindles for rotating valves
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
A valve used to control the flow of fluid in the oil and gas industry comprises a valve body 10 having an internal flow passage 12 extending between an inlet and an outlet of the valve. A valve member 11 is disposed in the valve body 10 for controlling the flow of fluid along the passage 12 between the inlet and outlet, and is moveable between open and closed positions by rotational shaft 13 coupled to the valve member 11. The shaft 13 extends externally of the valve body 10 through a bore formed therein, and an annular seal 15 is disposed around the shaft 13 for providing a seal between the shaft 13 and the valve body 10. The seal 15 is formed of a material comprising a filler and/or reinforcing material and a binder of hydrogenated nitrile-butadiene rubber (HNBR). The hydrogenated nitrile-butadiene rubber material is able to withstand extremely high temperatures to maintain an operational seal around the shaft 13 without any leakage.
Description
VALVE
This invention relates to a valve for controlling the flow of fluid and more particularly to a valve which is able to withstand high temperatures.
Valves such as ball valves and butterfly valves are well known for controlling the flow of fluids along ducts. A typical such valve comprises a valve body having an inlet, and outlet and a valve member disposed inside the valve body for controlling the flow of fluid along a passage extending between the inlet and outlet.
Generally the valve member is connected to an actuator shaft, which extends through the body to a point externally thereof. The external portion of the shaft is connected to a hand wheel, lever, motor or other actuator for moving the valve member inside the valve body between open and closed positions.
In order to prevent the egress of fluid from the valve body along the shaft, it is well known to provide an annular seal between the shaft and the valve body. One such arrangement is disclosed in EP0063452 and comprises an annular seal disposed inside a cavity or so-called stuffing box in the valve body, through which the shaft extends. The seal is held in-situ by a clamping ring, which axially compresses the seal inside the stuffing box and causes it to expand radially to form an effective seal between the shaft and the valve body.
Typically valve shaft seals are formed of PTFE, which is hardwearing. However, a disadvantage of FTFE is that it can melt under high temperatures, thereby making it unsuitable for use in some applications, such as in valves used to control the flow of water for fire fighting installations in the oil and gas industry.
In order to overcome this problem, it is also well know to use a graphite material as a valve shaft seal. However, a disadvantage of using a graphite seal in a stainless steel valve body is that galvanic corrosion can potentially occur between the graphite and the stainless steel if the valve is exposed to sea water.
Whilst asbestos is fireproof and able to act as a valve shaft seal, the use of asbestos is generally avoided for obvious health reasons.
We have now devised a valve which alleviates the above-mentioned problems.
In accordance with the present invention, there is provided a valve comprising a valve body having an internal flow passage extending between an inlet and an outlet of the valve, a valve member disposed in the valve body for controlling the flow of fluid along the passage between the inlet and outlet, a rotational shaft coupled to the valve member, the shaft extending externally off the valve body through a bore formed therein, and an annular seal disposed around the shaft for providing a seal between the shaft and the valve body, wherein the seal is formed of a material comprising a filler and/or reinforcing material and a binder of hydrogenated nitrile-butadiene rubber (HNBR).
The material used for the seal is known for use as a thin static gasket between pipe flanges, which gaskets are able to withstand high fluid temperatures in the pipe. We have surprisingly found that such material is also suitable for use as a dynamic seal between moving parts and can provide an extremely effective fire resistant valve shaft seal.
Preferably the filler material is a particulate and preferably comprises china-clay and/or silicon dioxide (silica).
Preferably the reinforcing material comprises fibres of aromatic polyamide or so-called aramid fibres and/or glass fibres.
Preferably the hydrogenated nitrile-butadiene rubber (HNBR) is vulcanised.
Preferably the seal has an axial length or thickness of at least 10mm and may comprise a one-piece annular member of said seal materials or a plurality of thinner annular members of said materials stacked together in face-to-face registration.
Preferably the seal is mounted in an annular cavity or so-called stuffing box in the valve body, through which the shaft extends.
Preferably means are provided for axially compressing the seal in the stuffing box.
An embodiment of the present invention will now be described by way of an example only and with reference to the accompanying drawings, in which: Figure 1 is a sectional view through a butterfly valve in accordance with the present invention; and Figure 2 is a perspective view of a valve shaft seal of the valve of Figure 1.
Referring to the drawings, there is shown a butterfly valve comprising a valve body 10 having an internal passage 12 extending between an inlet and an outlet of the valve. A disc-shaped valve member 11 is mounted inside the valve body 10 for selectively opening and closing the passage 12. The valve member 11 is mounted to a rotatable shaft 13 which extends radially outwardly through the valve body 10 to the exterior of the valve.
The shaft 13 extends through a bore in the valve body 10, the outer end of the bore being enlarged to define a cavity or so-called stuffing box 14. An annular shaft seal is disposed inside the stuffing box 14 around the shaft 13. A flanged collar 16 is then clamped in-situ by bolts 17 to axially compress the seal 15 inside the stuffing box 14, such that an effective seal is formed between the shaft 13 and the valve body 10. In this manner, the egress of fluids from the passage 12 along the shaft 13 is prevented. The shaft 13 can be rotated about its longitudinal axis to move the valve member 11 between its open and closed positions or to a position therebetween.
The seal 15 is formed of a material which comprises china-clay, silicon dioxide, aramid fibres and glass fibres contained within a hydrogenated nitrile-butadiene rubber (HNBR) matrix binder. The seal 15 may comprise a one-piece member of these materials or it may comprise a plurality of thinner seal members stacked together as shown.
The seal 15 is able to withstand extremely high temperatures to maintain an operational seal around the shaft 13 without any leakage. The present invention thus provides a fire safe valve, which is free of asbestos or graphite based stem seals.
Claims (12)
- CLAIMS1. A valve comprising a valve body having an internal flow passage extending between an inlet and an outlet of the valve, a valve member disposed in the valve body for controlling the flow of fluid along the passage between the inlet and outlet, a rotational shaft coupled to the valve member, the shaft extending externally of the valve body through a bore formed therein, and an annular seal disposed around the shaft for providing a seal between the shaft and the valve body, wherein the seal is formed of a material comprising a filler and/or reinforcing material and a binder of hydrogenated nitrile-butadiene rubber (HNBR).
- 2. A valve as claimed in claim 1, in which the filler material is a particulate.
- 3. A valve as claimed in claim 2, in which the tiller material comprises china-clay andlor silicon dioxide (silica).
- 4. A valve as claimed in any preceding claim, in which the reinforcing material comprises fibres of aromatic polyamide. or so-called aramid fibres and/or glass fibres.S..... * S ***** *
- 5. A valve as claimed in any preceding claim, in which the reinforcing material comprises glass fibres. S...S*5**SS * 25
- 6. A valve as claimed in any preceding claim, in which the hydrogenated nitrile-butadiene rubber (HNBR) is vulcanised.S..... *
- 7. A valve as claimed in any preceding claim, in which the seal has an axial length or thickness of at least 10mm.
- 8. A valve as claimed in any preceding claim, in which the seal comprises a one-piece annular member of said materials.
- 9. A valve as claimed in any preceding claim, in which the seal comprises a plurality of annular members of said materials stacked together in face-to-face registration.
- 10. A valve as claimed in any preceding claim, in which the seal is mounted in an annular cavity or so-called stuffing box in the valve body, through which the shaft extends.
- 11. A valve as claimed in any claim 10, in which means are provided for axially compressing the seal in the stuffing box.
- 12. A valve substantially as herein described with reference to the accompanying drawings. * ** fli.. * * ** 3 * S S. tS *5s** * 5 a. * * * * * S.S....' * S
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1016971.2A GB2484338B (en) | 2010-10-08 | 2010-10-08 | Valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1016971.2A GB2484338B (en) | 2010-10-08 | 2010-10-08 | Valve |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201016971D0 GB201016971D0 (en) | 2010-11-24 |
| GB2484338A true GB2484338A (en) | 2012-04-11 |
| GB2484338B GB2484338B (en) | 2018-01-24 |
Family
ID=43304259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1016971.2A Active GB2484338B (en) | 2010-10-08 | 2010-10-08 | Valve |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2484338B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015054779A1 (en) * | 2013-10-18 | 2015-04-23 | Soucy Techno Inc. | Rubber compositions and uses thereof |
| US9663640B2 (en) | 2013-12-19 | 2017-05-30 | Soucy Techno Inc. | Rubber compositions and uses thereof |
| US9879131B2 (en) | 2012-08-31 | 2018-01-30 | Soucy Techno Inc. | Rubber compositions and uses thereof |
| CN113418012A (en) * | 2021-06-21 | 2021-09-21 | 四川蜀凤梧环保科技有限公司 | Multifunctional discharge valve for kitchen waste collecting and transporting vehicle and discharge method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944769B (en) * | 2021-12-22 | 2022-03-29 | 成都乘风阀门有限责任公司 | Novel all-welded flat gate valve |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0063452A1 (en) * | 1981-04-16 | 1982-10-27 | Keystone International, Inc. | Packing gland |
| JP2001032944A (en) * | 1999-07-19 | 2001-02-06 | Nichias Corp | Gland packing |
-
2010
- 2010-10-08 GB GB1016971.2A patent/GB2484338B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0063452A1 (en) * | 1981-04-16 | 1982-10-27 | Keystone International, Inc. | Packing gland |
| JP2001032944A (en) * | 1999-07-19 | 2001-02-06 | Nichias Corp | Gland packing |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9879131B2 (en) | 2012-08-31 | 2018-01-30 | Soucy Techno Inc. | Rubber compositions and uses thereof |
| WO2015054779A1 (en) * | 2013-10-18 | 2015-04-23 | Soucy Techno Inc. | Rubber compositions and uses thereof |
| US9840611B2 (en) | 2013-10-18 | 2017-12-12 | Soucy Techno Inc. | Rubber compositions and uses thereof |
| US9663640B2 (en) | 2013-12-19 | 2017-05-30 | Soucy Techno Inc. | Rubber compositions and uses thereof |
| CN113418012A (en) * | 2021-06-21 | 2021-09-21 | 四川蜀凤梧环保科技有限公司 | Multifunctional discharge valve for kitchen waste collecting and transporting vehicle and discharge method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201016971D0 (en) | 2010-11-24 |
| GB2484338B (en) | 2018-01-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) |
Free format text: REGISTERED BETWEEN 20170331 AND 20170405 |