WO2008039198A1 - High pressure ball valve seal assembly - Google Patents
High pressure ball valve seal assembly Download PDFInfo
- Publication number
- WO2008039198A1 WO2008039198A1 PCT/US2006/038070 US2006038070W WO2008039198A1 WO 2008039198 A1 WO2008039198 A1 WO 2008039198A1 US 2006038070 W US2006038070 W US 2006038070W WO 2008039198 A1 WO2008039198 A1 WO 2008039198A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- gap
- contact location
- ball
- contact
- Prior art date
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
- F16K5/0689—Packings between housing and plug
-
- 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
- F16K5/08—Details
- F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
- F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
- F16K5/205—Sealing effected by the flowing medium
Definitions
- the field of this invention is ball valves and more particularly ball valves for downhole use that seal against high differential pressures.
- Ball valves have a variety of applications in many industries and are also commonly used for zone isolation and fluid loss prevention services. These valves typically house a ball in a housing wherein the housing features a seat above and below the ball that is spring loaded or otherwise biased against the ball when the ball is rotated to the valve closed position.
- Figures 1 and 2 schematically illustrate the problem in the prior art designs when the ball is subjected to applied differential pressure in one of two opposed directions.
- Figure 1 shows a ball 10 having a passage 12 that is close to the size of the inlet and outlet to the housing for the ball 10, which is omitted from the drawing for greater clarity.
- a seat 14 has a bias 16 applied in a direction toward the ball 10.
- the ball 10 is in the closed position in Figure 1 as the passage 12 is rotated away from seat 14 so that a blank solid portion 18 is engaged to the seat 14 with the bias 16 pushing the two together to enhance the seal.
- Ball 10 has truncated straight sides 20 and 22 to allow connection of operators (not shown) that can rotate it 90 degrees in opposed directions between the open and the closed positions. As can be seen in Figure 1, the ball is thicker and therefore stronger nearer sides 20 and 22. However near the center 24, there is considerably less material and the ball structure is relatively weaker.
- Figure 2 illustrates what happens under high pressure differentials because of the inherent structure of the ball 10. The portion near the center 24 in the closed position and under applied differential pressure 26 deflects at 28 and separates from the seat 14 to permit leakage.
- the present invention addresses this issue of deflection at the thin portion of the ball 10 under high differential pressures with a simple and effective solution that simply allows compensation for the deflection where separation from the seat 14 will not happen.
- a ball design for withstanding high differential pressures without leakage features a circumferential groove near the circle of contact on the ball with a surrounding seat. High differential forces are transmitted beyond the circle of contact so that deflection due to applied differential pressures results in flexing in the groove area while maintaining full circumferential seat contact to prevent leakage.
- Figure 1 is a schematic view of a prior art ball of a ball valve in the closed position before differential pressure exists
- Figure 2 is the view of Figure 1 with applied differential pressure causing flexing near the center of the ball and a separation from the adjacent seat;
- Figure 3 is a schematic view of the ball of the present invention in the closed position before differential pressure is applied;
- Figure 4 is the view of Figure 3 with differential pressure applied and showing the groove flexing away from the seat area to help maintain full 360 degree contact with the seat.
- Figure 3 shows the ball 100 having a passage 120 and opposed flat sides 200 and 220 for the same purpose as previously described.
- a seat 140 is under a bias force 160.
- the solid portion 180 of the ball 100 makes a full 360 degree contact with the seat 140 to isolate a passage 150.
- the ball 100 has a peripheral groove 170 that is disposed between the circle of contact of the ball 100 with the seat 140 and above the passage 120. Groove 170 can have a uniform or varying cross sectional shape. It can be continuous or discontinuous over the circumference.
- the opposing walls 190 and 210 can taper away from each other toward the outer surface of the ball 100 so as not to contact each other when deflection 280 of surface 210 occurs under differential pressure loading 260.
- the surface 180 deflects uniformly maintaining 360 degree contact with the seat 140 because the support for the seat 140 on the surface 180 is equalized.
- the balance of the load from the applied differential pressure 260 is transferred through the ball to the bottom of the groove 170 at surface 210 which deflects 280 in response to that load.
- the deflection does not result in separation between the surface 180 and the seat 140.
- the present invention provides a mechanism for distancing the anticipated deflection to a point beyond the sealing contact of the ball surface to the surrounding seat. It provides recognition of the cause of a problem that has undermined sealing integrity in the past and proposes generally a solution of a mechanism to tolerate deflection but to make it an inconsequential event that does not undermine sealing integrity on the seat. The distancing of the deflection does not reduce the size of the ball passage.
- An alternate approach to addressing the problem could be by making the ball thicker at the presently anticipated deflection location. While that technique can conceivably result in sealing integrity at the seat under high differential pressures, it may result in a decrease of the passage diameter through the ball to achieve it.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0807266A GB2445509A (en) | 2005-09-29 | 2006-09-28 | High pressure ball valve seal assembly |
PCT/US2006/038070 WO2008039198A1 (en) | 2006-09-28 | 2006-09-28 | High pressure ball valve seal assembly |
AU2006348695A AU2006348695A1 (en) | 2005-09-29 | 2006-09-28 | High pressure ball valve seal assembly |
CA002628018A CA2628018A1 (en) | 2006-09-28 | 2006-09-28 | High pressure ball valve seal assembly |
NO20081584A NO20081584L (en) | 2006-09-28 | 2008-04-01 | High-pressure ball valve assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2006/038070 WO2008039198A1 (en) | 2006-09-28 | 2006-09-28 | High pressure ball valve seal assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008039198A1 true WO2008039198A1 (en) | 2008-04-03 |
Family
ID=37726623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2006/038070 WO2008039198A1 (en) | 2005-09-29 | 2006-09-28 | High pressure ball valve seal assembly |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU2006348695A1 (en) |
CA (1) | CA2628018A1 (en) |
NO (1) | NO20081584L (en) |
WO (1) | WO2008039198A1 (en) |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3827671A (en) * | 1973-06-11 | 1974-08-06 | Auto Valve Inc | Low pressure ball valve with annular seal |
US3940107A (en) * | 1974-09-06 | 1976-02-24 | Premier Industrial Corporation | Rotary valve with spring clutch |
US4147327A (en) * | 1977-06-16 | 1979-04-03 | Acf Industries, Incorporated | Metallic seals for ball valve |
GB2037404A (en) * | 1978-11-29 | 1980-07-09 | Jamesbury Corp | Ball valve seat |
EP0046663A1 (en) * | 1980-08-25 | 1982-03-03 | Grove Valve And Regulator Company | Fluid flow control valve with fire-safe seal |
US4477055A (en) * | 1983-06-30 | 1984-10-16 | Acf Industries, Incorporated | Valve seat for ball valves |
EP0264179A2 (en) * | 1986-08-22 | 1988-04-20 | Terence Peter Nicholson | Improvements relating to rotary ball valves and ball joints |
WO1993001432A1 (en) * | 1991-07-12 | 1993-01-21 | Den Norske Stats Oljeselskap A.S | Valve arrangement |
DE29806226U1 (en) * | 1998-04-04 | 1998-06-18 | Xomox International GmbH & Co, 88131 Lindau | Fitting |
GB2352019A (en) * | 1999-07-15 | 2001-01-17 | Alan David James | Valve seat with frusto-conical extension |
US20010025941A1 (en) * | 1999-12-15 | 2001-10-04 | University Of Alabama | Valve having ceramic components and associated fabrication method |
-
2006
- 2006-09-28 CA CA002628018A patent/CA2628018A1/en not_active Abandoned
- 2006-09-28 AU AU2006348695A patent/AU2006348695A1/en not_active Abandoned
- 2006-09-28 WO PCT/US2006/038070 patent/WO2008039198A1/en active Application Filing
-
2008
- 2008-04-01 NO NO20081584A patent/NO20081584L/en not_active Application Discontinuation
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3827671A (en) * | 1973-06-11 | 1974-08-06 | Auto Valve Inc | Low pressure ball valve with annular seal |
US3940107A (en) * | 1974-09-06 | 1976-02-24 | Premier Industrial Corporation | Rotary valve with spring clutch |
US4147327A (en) * | 1977-06-16 | 1979-04-03 | Acf Industries, Incorporated | Metallic seals for ball valve |
GB2037404A (en) * | 1978-11-29 | 1980-07-09 | Jamesbury Corp | Ball valve seat |
EP0046663A1 (en) * | 1980-08-25 | 1982-03-03 | Grove Valve And Regulator Company | Fluid flow control valve with fire-safe seal |
US4477055A (en) * | 1983-06-30 | 1984-10-16 | Acf Industries, Incorporated | Valve seat for ball valves |
EP0264179A2 (en) * | 1986-08-22 | 1988-04-20 | Terence Peter Nicholson | Improvements relating to rotary ball valves and ball joints |
WO1993001432A1 (en) * | 1991-07-12 | 1993-01-21 | Den Norske Stats Oljeselskap A.S | Valve arrangement |
DE29806226U1 (en) * | 1998-04-04 | 1998-06-18 | Xomox International GmbH & Co, 88131 Lindau | Fitting |
GB2352019A (en) * | 1999-07-15 | 2001-01-17 | Alan David James | Valve seat with frusto-conical extension |
US20010025941A1 (en) * | 1999-12-15 | 2001-10-04 | University Of Alabama | Valve having ceramic components and associated fabrication method |
Also Published As
Publication number | Publication date |
---|---|
CA2628018A1 (en) | 2008-04-03 |
NO20081584L (en) | 2008-04-28 |
AU2006348695A1 (en) | 2008-04-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9989157B2 (en) | Valve vented redundant stem seal system | |
CN102422065B (en) | For the two way sealed assembly of valve | |
CN112005033B (en) | Valve seat, valve assembly and related methods | |
US7712724B2 (en) | Dynamic ball valve sealing device for three-way valves | |
US7559531B2 (en) | Low torque ball valve with dynamic sealing | |
US20080142752A1 (en) | Plug valve having a seal boss | |
US8398053B2 (en) | Double piston trunnion mounted ball valves and methods of use | |
US4471943A (en) | Valve assembly and seat | |
KR20110128788A (en) | Valve having high pressure and low pressure seals | |
US8827238B2 (en) | Flow control device | |
US20060118750A1 (en) | Flexible backseat seal for gate valve | |
KR19980701813A (en) | Valve assembly with improved valve seat | |
US20080157016A1 (en) | Valve with Self-Expanding Seals | |
JPH026951B2 (en) | ||
NO339991B1 (en) | Axially actuated ball valve | |
US20130032747A1 (en) | Face sealing annular valve for a fluid-working machine | |
CN102155548B (en) | Sliding plate valve | |
KR20060094864A (en) | Butterfly valve with controlled compression of the seat | |
US20070069173A1 (en) | High pressure ball valve seal assembly | |
WO2008039198A1 (en) | High pressure ball valve seal assembly | |
US3846885A (en) | Valve with elliptical sealing | |
WO2016171857A1 (en) | Valve vented redundant stem seal system | |
JPS62266276A (en) | Ball valve | |
US20130299730A1 (en) | Valve seat for a ball valve | |
CA2286033A1 (en) | Butterfly valve |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2628018 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2006348695 Country of ref document: AU |
|
ENP | Entry into the national phase |
Ref document number: 0807266 Country of ref document: GB Kind code of ref document: A Free format text: PCT FILING DATE = 20060928 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 0807266.2 Country of ref document: GB Ref document number: 807266 Country of ref document: GB |
|
ENP | Entry into the national phase |
Ref document number: 2006348695 Country of ref document: AU Date of ref document: 20060928 Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 06825244 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 06825244 Country of ref document: EP Kind code of ref document: A1 |