CA1040184A - Ball-valve seal - Google Patents
Ball-valve sealInfo
- Publication number
- CA1040184A CA1040184A CA259,313A CA259313A CA1040184A CA 1040184 A CA1040184 A CA 1040184A CA 259313 A CA259313 A CA 259313A CA 1040184 A CA1040184 A CA 1040184A
- Authority
- CA
- Canada
- Prior art keywords
- ball
- ring
- sealing
- sealing ring
- radial step
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
- Closures For Containers (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a ball-valve having a rotatable ball and a sealing ring contacting the surface of the ball, a radial seal includes a backing ring to contact the rear face of the sealing ring and a spring between the backing ring and an abutment on the valve body, the sealing ring having a radial step which contacts a similar radial step on the valve body when the ball is under fluid pressure.
In a ball-valve having a rotatable ball and a sealing ring contacting the surface of the ball, a radial seal includes a backing ring to contact the rear face of the sealing ring and a spring between the backing ring and an abutment on the valve body, the sealing ring having a radial step which contacts a similar radial step on the valve body when the ball is under fluid pressure.
Description
THIS INVENTION relates to ball-valves, that is, valves in which a rotary ball having a dia~netral hole acts to block or open the way between inlet and outlet passages in the valve body~
In particular~ this invention relates to the construction o-f a peripheral seal between the ball and th~
periphery of said passagesO
Such peripheral seals have been formed with a resilient sealing ring in contact with the surface of the ball, a rigid backing ring behind the sealing ring and a spring element between the rear of the backing ring and an abutment on the valve body.
In high-pressure valves where the ball is "floating"
(i.e. is not trunnion-mounted) the ball in "off" position is forced by fluid pressure against the downstream sealing assembly. This may tend to extrude the sealing ring out of its position or make it "cold-flow", particularly in large-di~meter valves, and 90 make the seal assembly ineffective~
In Australian Patent No~ 439,927 it is proposed to form corresponding steps in the rear face of the sealing ring and ~` the front face of the backing-ring, to hinder this extrusion of the sealing ring under pressure.
SUMMARY OF_THE PRESENT INVENTION
; 25 It is an object of this invention to provide further
In particular~ this invention relates to the construction o-f a peripheral seal between the ball and th~
periphery of said passagesO
Such peripheral seals have been formed with a resilient sealing ring in contact with the surface of the ball, a rigid backing ring behind the sealing ring and a spring element between the rear of the backing ring and an abutment on the valve body.
In high-pressure valves where the ball is "floating"
(i.e. is not trunnion-mounted) the ball in "off" position is forced by fluid pressure against the downstream sealing assembly. This may tend to extrude the sealing ring out of its position or make it "cold-flow", particularly in large-di~meter valves, and 90 make the seal assembly ineffective~
In Australian Patent No~ 439,927 it is proposed to form corresponding steps in the rear face of the sealing ring and ~` the front face of the backing-ring, to hinder this extrusion of the sealing ring under pressure.
SUMMARY OF_THE PRESENT INVENTION
; 25 It is an object of this invention to provide further
- 2 - ~
Q4~
means in the seal asse ~ ly to prevent such extrusion.
¦ The invention also enables large-valve sealing assem-blies to be made o~ less longitudinal width, and of greater radial thickness at the ball contact.
The invention comprises a ball-valve assembly including a valve body, said body including an annular abutment and an annular radial step formed axially inwardly of said a~utment, a backing ring of rigid material and a spring element between the rear of said backing ring and said abutment, a sealing ring of deformable material, the outer peripheral surface of said sealing riny having a radial step conforming in dimension to said annular radial step formed on said valve body and s~aced therefrom when the ball is not displaced by fluid pressure, the ball, when dis-placed by fluid pressure, causing said annular radial step on said sealing ring to con-tact said annular radial step on said body thereby to improve the sealing contact with said body and to increase the area of contact of said ring with said ball.
The present invention will be further illustrated by way of the accompanying drawings in which:
Fig. 1 shows in section part of a ball and sealing assembly not under pressure; and Fig. 2 shows the same view with pressure applied to the ball.
Referring to the drawings a valve body 10 has an outlet passage 11, flow through which is controlled by a rotary ball 12.
A sealing assembly between ball 12 and body 10 includes a sealing ring 13 of deformable material such as P.T.F.E., contacting and sealing to ball 12, a rigid backing ring 14
Q4~
means in the seal asse ~ ly to prevent such extrusion.
¦ The invention also enables large-valve sealing assem-blies to be made o~ less longitudinal width, and of greater radial thickness at the ball contact.
The invention comprises a ball-valve assembly including a valve body, said body including an annular abutment and an annular radial step formed axially inwardly of said a~utment, a backing ring of rigid material and a spring element between the rear of said backing ring and said abutment, a sealing ring of deformable material, the outer peripheral surface of said sealing riny having a radial step conforming in dimension to said annular radial step formed on said valve body and s~aced therefrom when the ball is not displaced by fluid pressure, the ball, when dis-placed by fluid pressure, causing said annular radial step on said sealing ring to con-tact said annular radial step on said body thereby to improve the sealing contact with said body and to increase the area of contact of said ring with said ball.
The present invention will be further illustrated by way of the accompanying drawings in which:
Fig. 1 shows in section part of a ball and sealing assembly not under pressure; and Fig. 2 shows the same view with pressure applied to the ball.
Referring to the drawings a valve body 10 has an outlet passage 11, flow through which is controlled by a rotary ball 12.
A sealing assembly between ball 12 and body 10 includes a sealing ring 13 of deformable material such as P.T.F.E., contacting and sealing to ball 12, a rigid backing ring 14
- 3 -~4~
' behind ring 13 and a ~lat spring ring 15 between the rear face 16 of ring 14 and a radial abutment 17 on body 10.
The rear face 18 of ring 13 is of wedge-section and mates with the ~ront face of ring 14 with a "step" 19 in both (as is described in Australian Patent 439~927)o The outer periphery of ring 13 has a radial step 20 and the body 10 a corresponding step 21, As shown in FIG. 1, with spring 15 not fully compressed steps 20~ 21 are not in contact : but when spring 15 is flattened by moven1ent of ball 12 to the right the steps do contact (FIGo 2) ~
The area of contact of steps 20~ 21 greatly increases the area taking longitudinal thrust, so that thrust per unit area is reducedO
Sealing ring 13 is held in position both by step 19 and steps 20, 21 and is prevented from being extruded. Also the sealing of ring 13 to the body 10 is impro~ed by the contact of steps 20, 21.
It will be seen that the provision of step 20 on ring 13 also pro~ides greater radial thickness of ring 13 at the end contacting ball 12. The area of ball contact therefore is increased, with less likelihood of cold flow or extrusion of . the ring 13 in this region.
,: ~
`~,. While the invention has been described in relation to the 'Iwedge-seal" type of assembly of Australian Patent No. 439,927 it can be applied to other assemblies of sealing ring, backing ring and spring.
_ 4 _ .
: ~ .
.
' behind ring 13 and a ~lat spring ring 15 between the rear face 16 of ring 14 and a radial abutment 17 on body 10.
The rear face 18 of ring 13 is of wedge-section and mates with the ~ront face of ring 14 with a "step" 19 in both (as is described in Australian Patent 439~927)o The outer periphery of ring 13 has a radial step 20 and the body 10 a corresponding step 21, As shown in FIG. 1, with spring 15 not fully compressed steps 20~ 21 are not in contact : but when spring 15 is flattened by moven1ent of ball 12 to the right the steps do contact (FIGo 2) ~
The area of contact of steps 20~ 21 greatly increases the area taking longitudinal thrust, so that thrust per unit area is reducedO
Sealing ring 13 is held in position both by step 19 and steps 20, 21 and is prevented from being extruded. Also the sealing of ring 13 to the body 10 is impro~ed by the contact of steps 20, 21.
It will be seen that the provision of step 20 on ring 13 also pro~ides greater radial thickness of ring 13 at the end contacting ball 12. The area of ball contact therefore is increased, with less likelihood of cold flow or extrusion of . the ring 13 in this region.
,: ~
`~,. While the invention has been described in relation to the 'Iwedge-seal" type of assembly of Australian Patent No. 439,927 it can be applied to other assemblies of sealing ring, backing ring and spring.
_ 4 _ .
: ~ .
.
Claims (3)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A ball-valve assembly including a valve body, said body including an annular abutment and an annular radial step formed axially inwardly of said abutment, a backing ring of rigid material and a spring element between the rear of said backing ring and said abutment, a sealing ring of deformable material, the outer peripheral surface of said sealing ring having a radial step conforming in dimension to said annular radial step formed on said valve body and spaced therefrom when the hall is not displaced by fluid pressure; the ball when displaced by fluid pressure, causing said annular radial step on said sealing ring to contact said annular radial step on said body thereby to improved the sealing contact with said body and to increase the area of contact of said ring with said ball,
2. A ball-valve sealing assembly as claimed in claim 1, further characterized in that the rear face of the sealing ring is of wedge-section and mates with n similar wedge-section formed on the bottom front face of said backing ring.
3. A ball-valve sealing assembly as claimed in claim 2, further characterized in that both the rear face of the sealing ring and the bottom front face of the backing ring are provided with mating steps at their adjoining surfaces.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPC282975 | 1975-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1040184A true CA1040184A (en) | 1978-10-10 |
Family
ID=3766331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA259,313A Expired CA1040184A (en) | 1975-08-18 | 1976-08-18 | Ball-valve seal |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5224331A (en) |
| BR (1) | BR7605416A (en) |
| CA (1) | CA1040184A (en) |
| DE (1) | DE2637030C2 (en) |
| ES (1) | ES450787A1 (en) |
| FR (1) | FR2321644A1 (en) |
| GB (1) | GB1517663A (en) |
| IN (1) | IN144549B (en) |
| IT (1) | IT1074126B (en) |
| NL (1) | NL181598C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8430368D0 (en) * | 1984-11-30 | 1985-01-09 | Southerton Ltd James | Valves |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3118650A (en) * | 1961-02-28 | 1964-01-21 | Sargent Engineering Corp | Ball valve construction |
| US3387815A (en) * | 1965-05-21 | 1968-06-11 | Richards & Co B C | Seat for ball-valve and ball-valve using this seat |
| DE6805662U (en) * | 1968-11-06 | 1969-12-18 | Neue Argus Gmbh | RING SEAL IN TRAPEZONE SHAPE FOR BALL PLUG IN BALL VALVES |
| DE2024561A1 (en) * | 1970-05-20 | 1971-12-02 | Richards & Co B C | Valve with rotary plug and ball seat |
-
1976
- 1976-08-17 GB GB34278/76A patent/GB1517663A/en not_active Expired
- 1976-08-17 IN IN1500/CAL/1976A patent/IN144549B/en unknown
- 1976-08-17 DE DE2637030A patent/DE2637030C2/en not_active Expired
- 1976-08-18 NL NLAANVRAGE7609166,A patent/NL181598C/en not_active IP Right Cessation
- 1976-08-18 JP JP51099196A patent/JPS5224331A/en active Pending
- 1976-08-18 FR FR7625090A patent/FR2321644A1/en active Granted
- 1976-08-18 ES ES450787A patent/ES450787A1/en not_active Expired
- 1976-08-18 BR BR7605416A patent/BR7605416A/en unknown
- 1976-08-18 IT IT50926/76A patent/IT1074126B/en active
- 1976-08-18 CA CA259,313A patent/CA1040184A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BR7605416A (en) | 1977-08-16 |
| GB1517663A (en) | 1978-07-12 |
| IT1074126B (en) | 1985-04-17 |
| NL181598B (en) | 1987-04-16 |
| JPS5224331A (en) | 1977-02-23 |
| FR2321644B1 (en) | 1980-06-13 |
| NL7609166A (en) | 1977-02-22 |
| IN144549B (en) | 1978-05-13 |
| FR2321644A1 (en) | 1977-03-18 |
| NL181598C (en) | 1987-09-16 |
| ES450787A1 (en) | 1977-08-01 |
| DE2637030C2 (en) | 1986-10-16 |
| DE2637030A1 (en) | 1977-03-03 |
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