CA1192889A - Annular seal gasket for a shut-off ball valve - Google Patents
Annular seal gasket for a shut-off ball valveInfo
- Publication number
- CA1192889A CA1192889A CA000410604A CA410604A CA1192889A CA 1192889 A CA1192889 A CA 1192889A CA 000410604 A CA000410604 A CA 000410604A CA 410604 A CA410604 A CA 410604A CA 1192889 A CA1192889 A CA 1192889A
- Authority
- CA
- Canada
- Prior art keywords
- gasket
- annular
- section
- ball
- seal
- 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.)
- Expired
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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
- F16K5/0673—Composite packings
- F16K5/0678—Composite packings in which only one of the components of the composite packing is contacting the plug
Abstract
"ANNULAR SEAL GASKET FOR A SHUT-OFF BALL VALVE"
ABSTRACT
A main annular gasket for hermetically sealing a shut-off ball valve, constituted by an elastomer of substantially triangular cross-section with rounded vertices and a curved base, and which is retained in a front cavity, also of triangular cross-section, in the annular floating seal member of said valve by means of a metal retaining ring.
ABSTRACT
A main annular gasket for hermetically sealing a shut-off ball valve, constituted by an elastomer of substantially triangular cross-section with rounded vertices and a curved base, and which is retained in a front cavity, also of triangular cross-section, in the annular floating seal member of said valve by means of a metal retaining ring.
Description
"ANNULAR SEAL GASKET FOR A SHUT-O~'E' BALL V~IVE"
q'hi~ i.nYeIltion relates to a new type of annlll3r ga6ket ~hich enable~ effective9 reliable an~ la6tirlg herrnetlc ~eal.ing to be obta~Led in a shut~off ball val~re, even ~hen thls latter i6 .~itted to large diameter pipe line~ and is thus subjected to high pre6sure differences.
The se31 in ~ ball valve i.6 knol~m to be provided at the present t.:i~e by mean6 of an an.nular floating member compris-ing 6uitsb'1e cavitie~ which respectively house the msin annul~r gasket providing sealing towards the ~al~re b~ll, snd the annular gasket provi.ding 6ealing towards the valve body~
,Said anrular floating member is urged towards said val~re bali by a set of springs which keep said main annulsr gasket i~
contsct with the ballS so providi.ng 2 seal even ~rhen the pressure diEference is zero9 thi6 seal becornin~ hermetic ~s the operatin6 pressure incresses i.n that this latter gcneratcs ~ progressive additional load on the main gasket by a pi~ton effect, It i~ apparcnt that in order to obtain an cffective hermetic
q'hi~ i.nYeIltion relates to a new type of annlll3r ga6ket ~hich enable~ effective9 reliable an~ la6tirlg herrnetlc ~eal.ing to be obta~Led in a shut~off ball val~re, even ~hen thls latter i6 .~itted to large diameter pipe line~ and is thus subjected to high pre6sure differences.
The se31 in ~ ball valve i.6 knol~m to be provided at the present t.:i~e by mean6 of an an.nular floating member compris-ing 6uitsb'1e cavitie~ which respectively house the msin annul~r gasket providing sealing towards the ~al~re b~ll, snd the annular gasket provi.ding 6ealing towards the valve body~
,Said anrular floating member is urged towards said val~re bali by a set of springs which keep said main annulsr gasket i~
contsct with the ballS so providi.ng 2 seal even ~rhen the pressure diEference is zero9 thi6 seal becornin~ hermetic ~s the operatin6 pressure incresses i.n that this latter gcneratcs ~ progressive additional load on the main gasket by a pi~ton effect, It i~ apparcnt that in order to obtain an cffective hermetic
2~ seal~ said main annular ga6ket should ideslly be very soft and projecting considerably from its housing. In this re6pec-t~
thc softer the gasket and the more it projects, the more it is ~ble to overeome 3XLy deEects on the ball surface due to constructional imperfectloxLs, scra'cches or incisions c~used by 2~ forei.gn matter entrsined by the operating :Elui~
On the other hand, the fundarlleIltal probl.cm arising in such valves when subjectf~. to high p:tesa~r:e differellces is the 4~
te~denc~ of the mai~ anrlular gas~et to become extruded~ l~e.
to ~eco~e dra~ged out of its housing during the openi.ng of such valves ~y fluid which throttlès at h^i~h speed through said housing~
In the present state of the art1 main annul3r seal ~raskets are used constructe~ of 3 resilient nlaterial and having a circular cro 5S- S ectionO
}lowevcr~ such a type of gasket obviously possesses none of the aforesaid characteristics necessary for provi.ding an effective hermetic sealO In thi~ respect~ the fact that the ga~ket is of circu].ar cross-section means that only a s~all proportion of it can project from the housing if the seal i~ to be effectively retained within said housingO Again, in order to prevent said extru&ion9 gasket~ have to be used which instoad of being soft are on the contrary rather rigid so thak h~rmful contraction of the gasket cannot occur~
Finally~ a gasket of circular cross-section can rotate in its seat during the movem~rlt of the b~ resulting in possible ~eformation of the ~asket and a consequent loss of the seal.
The object of the present inventi.on is to obviate the ~fore-s~id dra~backs by providing a main annular sea'l gasket for a ~hut~off ball valve which does not rotate in its seat during the nlovement of the bsll~ ~hich is not subject to extrusion during any thrott'li.n~ of -the operating fluid ~hen the va'lve is ~5 p~rtly open even thou~h it is constructed of so~t ~sterial7 which projects from it.s sest ~ush ~s to en6ure a s~al even ~gr~lnst partly d3~.a~ e(l surfaceF. of the bal,l~ snd finally which
thc softer the gasket and the more it projects, the more it is ~ble to overeome 3XLy deEects on the ball surface due to constructional imperfectloxLs, scra'cches or incisions c~used by 2~ forei.gn matter entrsined by the operating :Elui~
On the other hand, the fundarlleIltal probl.cm arising in such valves when subjectf~. to high p:tesa~r:e differellces is the 4~
te~denc~ of the mai~ anrlular gas~et to become extruded~ l~e.
to ~eco~e dra~ged out of its housing during the openi.ng of such valves ~y fluid which throttlès at h^i~h speed through said housing~
In the present state of the art1 main annul3r seal ~raskets are used constructe~ of 3 resilient nlaterial and having a circular cro 5S- S ectionO
}lowevcr~ such a type of gasket obviously possesses none of the aforesaid characteristics necessary for provi.ding an effective hermetic sealO In thi~ respect~ the fact that the ga~ket is of circu].ar cross-section means that only a s~all proportion of it can project from the housing if the seal i~ to be effectively retained within said housingO Again, in order to prevent said extru&ion9 gasket~ have to be used which instoad of being soft are on the contrary rather rigid so thak h~rmful contraction of the gasket cannot occur~
Finally~ a gasket of circular cross-section can rotate in its seat during the movem~rlt of the b~ resulting in possible ~eformation of the ~asket and a consequent loss of the seal.
The object of the present inventi.on is to obviate the ~fore-s~id dra~backs by providing a main annular sea'l gasket for a ~hut~off ball valve which does not rotate in its seat during the nlovement of the bsll~ ~hich is not subject to extrusion during any thrott'li.n~ of -the operating fluid ~hen the va'lve is ~5 p~rtly open even thou~h it is constructed of so~t ~sterial7 which projects from it.s sest ~ush ~s to en6ure a s~al even ~gr~lnst partly d3~.a~ e(l surfaceF. of the bal,l~ snd finally which
- 3 ~
is of simple and rapid installation.
Accordiny to the present invention there is provided a main annular seal gasket for a shut-off ball valve comprising an annular floating seal member which houses said gasket in a front cavity thereof and keeps it pressed resili-ently against -the valve ball, wherein said gasket is formed from an elastomer which has a substantialLy triangular cross-section with rounded vertices and a curved base, and which is retained in said front cavity, which is also of t.riangular cross-section, by means of a metal retention ring supported by said annular floating member.
Preferably, the triangular cross-.section of the gasket and the corresponding cross-section of the front cavity of said annular floating member are s~bstantially in the form of an isosceles triangle.
The fact of having the annular gasket in a form other -t:han circular, which is substantially triangular and which preferably widens rearwards,makes its escape from its housing impossible.
The invention is descxibed in detail hereinafter with reference to the accompanying drawings which illustrate a preferred embodiment thereof gi.ven by way of non-limiting example in that technical or constructional modifications can be made thereto without leaving -the scope of the present invention. In particular, the annular seal gasket according to the :Lnvention can be fi-tted to a gate valve instead of to a ball valve.
In said drawings:
.,_ ~igure 1 is a partial perspective view of a shut-~o~f ball valve using the 3nnular seal gasket accordiIlg to the inventioIl;
Figure 2 i.s a front section to an enlarged scale through that part of Flgure 1 in which the annular ~eal gasket ~c~ording to the invention is fitted;
~igl~e 3 is a front section through the annul~r 6eal gas~et according to the invention~ to a further enlarged scale.
In the figures, the reference numeral 1 indicates the valve body Df a shut-off ball valve, and ~ indicates an annular floating seal member which i.s dis~osed between the valve body 1 and the valve ball ~9 and is resiliently urged by a circum-ferential set of springs 4 agairlst said ball 3.
Said.an~ular floating member 2 acts as a support for an annular gasket 5 providingr a seal tGwards the valve bod~ 1 and for a main annular gasket 6 providin6r a hermetic seal towards the ball 3~ thiG latte.r gasket being housed in a front cavity 7 of the flo~ting me~ber 2, ~na being retained therein by a metal retaining ring ~ which is ~lso supported by the floatingr mel~ber- 2.
Said main annular g~sket 6 is o~ el.astomcr con6truction, and is formed sub~tantially by joining~ in a particular mannex, a normal O~ring of radiu~ r (see I~igure 3) to another 0-ring having a radius R which i6 much greater than the former, so as ~o obtain a re~ultant cro6s~secti.0n which wi.dens rearwards.
Xn short~ f;aid anntllar gasket 6 is in practice an elasto]~r of triaIlgular crosf;~.section wlth rotmaed vertice~ and a cuxved baf;e 6', 3~
According to a preferled embodiment~ ~aid tri.angul3r cro~
~CC1;ion of the an~ular gasket 6 i5 in the form of an i~osce~e~ triangle.
is of simple and rapid installation.
Accordiny to the present invention there is provided a main annular seal gasket for a shut-off ball valve comprising an annular floating seal member which houses said gasket in a front cavity thereof and keeps it pressed resili-ently against -the valve ball, wherein said gasket is formed from an elastomer which has a substantialLy triangular cross-section with rounded vertices and a curved base, and which is retained in said front cavity, which is also of t.riangular cross-section, by means of a metal retention ring supported by said annular floating member.
Preferably, the triangular cross-.section of the gasket and the corresponding cross-section of the front cavity of said annular floating member are s~bstantially in the form of an isosceles triangle.
The fact of having the annular gasket in a form other -t:han circular, which is substantially triangular and which preferably widens rearwards,makes its escape from its housing impossible.
The invention is descxibed in detail hereinafter with reference to the accompanying drawings which illustrate a preferred embodiment thereof gi.ven by way of non-limiting example in that technical or constructional modifications can be made thereto without leaving -the scope of the present invention. In particular, the annular seal gasket according to the :Lnvention can be fi-tted to a gate valve instead of to a ball valve.
In said drawings:
.,_ ~igure 1 is a partial perspective view of a shut-~o~f ball valve using the 3nnular seal gasket accordiIlg to the inventioIl;
Figure 2 i.s a front section to an enlarged scale through that part of Flgure 1 in which the annular ~eal gasket ~c~ording to the invention is fitted;
~igl~e 3 is a front section through the annul~r 6eal gas~et according to the invention~ to a further enlarged scale.
In the figures, the reference numeral 1 indicates the valve body Df a shut-off ball valve, and ~ indicates an annular floating seal member which i.s dis~osed between the valve body 1 and the valve ball ~9 and is resiliently urged by a circum-ferential set of springs 4 agairlst said ball 3.
Said.an~ular floating member 2 acts as a support for an annular gasket 5 providingr a seal tGwards the valve bod~ 1 and for a main annular gasket 6 providin6r a hermetic seal towards the ball 3~ thiG latte.r gasket being housed in a front cavity 7 of the flo~ting me~ber 2, ~na being retained therein by a metal retaining ring ~ which is ~lso supported by the floatingr mel~ber- 2.
Said main annular g~sket 6 is o~ el.astomcr con6truction, and is formed sub~tantially by joining~ in a particular mannex, a normal O~ring of radiu~ r (see I~igure 3) to another 0-ring having a radius R which i6 much greater than the former, so as ~o obtain a re~ultant cro6s~secti.0n which wi.dens rearwards.
Xn short~ f;aid anntllar gasket 6 is in practice an elasto]~r of triaIlgular crosf;~.section wlth rotmaed vertice~ and a cuxved baf;e 6', 3~
According to a preferled embodiment~ ~aid tri.angul3r cro~
~CC1;ion of the an~ular gasket 6 i5 in the form of an i~osce~e~ triangle.
Claims (5)
1. A main annular seal gasket for a shut-off ball valve comprising an annular floating seal member which houses said gasket in a front cavity thereof and keeps it pressed resiliently against the valve ball, wherein said gasket is formed from an elastomer which has a substantially triangular cross-section with rounded vertices and a curved base, and which is retained in said front cavity, which is also of triangular cross-section, by means of a metal retention ring supported by said annular floating member.
2. A main annular seal gasket as claimed in claim 1, wherein the triangular cross-section of said gasket and the corresponding cross-section of the front cavity of said annular floating member are substantially in the form of an isosceles triangle.
3. A main annular seal gasket according to claim 1, wherein said gasket is formed by joining a normal O-ring of radius r to another O-ring having a radius R which is greater than the former, so as to obtain a resultant cross-section which widens rearwards.
4. A main annular seal gasket according to claim 3, used in a valve body of a shut-off ball valve wherein said annular floating member is disposed between the valve body and a valve ball, said annular floating seal member being resiliently urged by a circumferential set of springs against said ball, said annular floating member acting as a support for another annular gasket providing a seal towards the valve body, said main annular seal gasket providing a hermetic seal towards said ball.
5. A main annular seal gasket according to claim 1, 2 or 4, wherein said cavity is also of triangular cross-section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT23730/81A IT1138189B (en) | 1981-09-02 | 1981-09-02 | RING SEAL FOR INTERCEPTION BALL VALVE |
| IT23730A/81 | 1981-09-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1192889A true CA1192889A (en) | 1985-09-03 |
Family
ID=11209506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000410604A Expired CA1192889A (en) | 1981-09-02 | 1982-09-01 | Annular seal gasket for a shut-off ball valve |
Country Status (8)
| Country | Link |
|---|---|
| JP (2) | JPS5846270A (en) |
| CA (1) | CA1192889A (en) |
| CH (1) | CH651641A5 (en) |
| DE (1) | DE3232565A1 (en) |
| FR (1) | FR2512158A1 (en) |
| GB (1) | GB2105010A (en) |
| IT (1) | IT1138189B (en) |
| SE (1) | SE448908B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8305603D0 (en) * | 1983-03-01 | 1983-03-30 | Marwin Controls Ltd | Fluid-pressure control valves |
| JPS59147962U (en) * | 1983-03-23 | 1984-10-03 | 株式会社神戸製鋼所 | Ball valve sealing mechanism |
| DE3715456A1 (en) * | 1987-05-08 | 1988-11-24 | Burgmann Dichtungswerk Feodor | BALL VALVE |
| JP4812091B2 (en) * | 2006-02-28 | 2011-11-09 | 株式会社キッツ | Ball valve |
| CN101398093B (en) | 2008-10-28 | 2012-03-21 | 浙江华夏阀门有限公司 | Dual ring lever shoulder seal and independence dual valve lever seal |
| EP2280204A1 (en) | 2009-07-31 | 2011-02-02 | Valbart S.r.l. | Trunnion-mounted ball valve with a flexible valve seat |
| EP2478275B1 (en) * | 2009-09-17 | 2015-06-10 | Gasket International S.p.A. | Seal system for industrial valves, particularly for ball valves, and valve comprising said system |
| US9982789B2 (en) | 2009-12-07 | 2018-05-29 | Cameron International Corporation | Self-relieving ball valve seat |
| US8733733B2 (en) | 2010-04-30 | 2014-05-27 | Fisher Controls International Llc | Sleeve seal assembly and rotary valve having sleeve seal assembly |
| US9777841B2 (en) | 2011-01-03 | 2017-10-03 | Cameron International Corporation | Trunnion ball valve seat with V-section spring |
| US9657848B2 (en) * | 2011-01-03 | 2017-05-23 | Cameron International Corporation | Trunnion ball valve with interchangeable and replaceable seat insert |
| CN103998837A (en) * | 2011-08-08 | 2014-08-20 | 加斯凯特国际股份公司 | Sealing system for industrial valves, particularly for ball valves, and valve comprising said system |
| DK177971B1 (en) * | 2013-06-20 | 2015-02-09 | Broen As | Spring gasket for valve housing |
| CA2842354A1 (en) * | 2014-02-11 | 2015-08-11 | Charles Lo Cicero | Delta ring seal for ball valve seat |
| JP6432433B2 (en) * | 2014-07-07 | 2018-12-05 | 株式会社デンソー | Valve device |
| JP6668780B2 (en) * | 2016-01-26 | 2020-03-18 | アイシン精機株式会社 | Refrigerant control valve device |
| MX2016012436A (en) * | 2016-03-22 | 2017-11-30 | Guide Valve Ltd | Ball valve seat with triple seal. |
| JP7195278B2 (en) * | 2018-01-10 | 2022-12-23 | 旭有機材株式会社 | butterfly valve |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1452769A (en) * | 1965-07-30 | 1966-09-16 | Robinetterie S A J Soc D | Further development of ball valves |
| US3508738A (en) * | 1966-05-02 | 1970-04-28 | Acf Ind Inc | Valve |
| US3575431A (en) * | 1968-08-19 | 1971-04-20 | Grove Valve & Regulator Co | Seal assembly |
| US3960363A (en) * | 1973-06-21 | 1976-06-01 | International Telephone And Telegraph Corporation | Ball valve |
-
1981
- 1981-09-02 IT IT23730/81A patent/IT1138189B/en active
-
1982
- 1982-08-23 GB GB08224148A patent/GB2105010A/en not_active Withdrawn
- 1982-08-31 CH CH5179/82A patent/CH651641A5/en not_active IP Right Cessation
- 1982-09-01 CA CA000410604A patent/CA1192889A/en not_active Expired
- 1982-09-01 SE SE8204986A patent/SE448908B/en not_active IP Right Cessation
- 1982-09-01 DE DE19823232565 patent/DE3232565A1/en active Granted
- 1982-09-02 JP JP57151823A patent/JPS5846270A/en active Pending
- 1982-09-02 FR FR8214981A patent/FR2512158A1/en active Granted
-
1985
- 1985-10-28 JP JP1985164255U patent/JPS6182181U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2512158A1 (en) | 1983-03-04 |
| CH651641A5 (en) | 1985-09-30 |
| DE3232565A1 (en) | 1983-03-17 |
| SE8204986L (en) | 1983-03-03 |
| SE448908B (en) | 1987-03-23 |
| IT1138189B (en) | 1986-09-17 |
| GB2105010A (en) | 1983-03-16 |
| JPS6182181U (en) | 1986-05-31 |
| SE8204986D0 (en) | 1982-09-01 |
| FR2512158B1 (en) | 1985-03-08 |
| JPS5846270A (en) | 1983-03-17 |
| IT8123730A0 (en) | 1981-09-02 |
| DE3232565C2 (en) | 1987-05-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |