EP1680614A1 - Vanne - Google Patents

Vanne

Info

Publication number
EP1680614A1
EP1680614A1 EP05786149A EP05786149A EP1680614A1 EP 1680614 A1 EP1680614 A1 EP 1680614A1 EP 05786149 A EP05786149 A EP 05786149A EP 05786149 A EP05786149 A EP 05786149A EP 1680614 A1 EP1680614 A1 EP 1680614A1
Authority
EP
European Patent Office
Prior art keywords
ball
valve
sealing means
downstream
pressure
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.)
Withdrawn
Application number
EP05786149A
Other languages
German (de)
English (en)
Inventor
Stuart Andrew Lomax
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alco Hi Tek Ltd
Alco Valves Group Ltd
Original Assignee
Xamol Ltd
Alco Hi Tek Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Xamol Ltd, Alco Hi Tek Ltd filed Critical Xamol Ltd
Publication of EP1680614A1 publication Critical patent/EP1680614A1/fr
Withdrawn legal-status Critical Current

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
    • F16K5/08—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

  • valve There are many different forms of valve which are provided for use in specific operating environments and to provide particular operational requirements.
  • DBB valves There are several versions of DBB valves currently available, with each version typically having features that enhance use, performance or safety.
  • the floating ball type has static seats or seals and a ball which is movable under the influence of pressure being applied to one side of the floating ball such that the ball contained within the valve is pushed toward a static seat downstream of the ball to make a pressure tight seal.
  • the disadvantage with this design is that as the pressure is applied, the ball moves towards the downstream seat and as it moves it releases the compression on the static upstream seat. This therefore means that the pressurised medium can then pass through the upstream seat due to lack of compression and fills the ball cavity. This therefore means that at any given time in practical operation only one seat is performing the sealing operation and this is the static seat downstream of the fluid which is applying the pressure on the ball. Thus, should the downstream seat fail there is no further seat to prevent leakage/ failure.
  • the trunnion mounted ball design has a static ball and dynamically movable seats . In this case if pressure is applied to one side of the trunnion mounted ball valve, the ball remains static and the upstream seat is pushed toward the static ball to make a pressure tight seal.
  • the disadvantage with this design is that if the upstream seat fails the downstream seat would be pressurised by the fluid and be pushed in the wrong direction away from the ball and leakage/ failure occurs .
  • the common pressure source is the fluid passing along a pipeline on which the valve is fitted.
  • the ball which is used is a modification of the ball of the type used in a floating ball valve design and the first and second sealing means which are used are modified pressure dynamic seats of the type used in a trunnion mounted ball valve design such that, in a previously unknown manner, the sealing means and the ball are all movable with respect to the valve body to create the sealing effect.
  • both upstream and downstream sealing means or seats work simultaneously under one pressure source from one direction.
  • a valve with one ball and two sealing means acting as pressure barriers thus allowing a compact valve to be provided with a single ball element that offers double block/pressure barrier isolation capability. This in turn provides advantages in terms of reduction of size and cost.
  • two of the valves in accordance with the invention, or a valve in accordance with the invention and another valve are mounted in line to provide a two ball element valve that has quadruple block/pressure barrier isolation capability for extra safety and reliability.
  • All embodiments can be fitted with other intervening devices between the seats or valves .
  • valve in accordance with the invention can be fitted in conjunction with a check or non-return valve at either end of the same to allow the subsequently formed valve assembly to function uni-directionally.
  • valve assembly in this form is used to allow services such as the injection of materials into the pipeline and/or removal of samples from the pipeline to be performed.
  • the ball of the valve as herein described is provided with a valve which allows the downstream side of the valve to be vented.
  • the downstream pressure is greater than that in the cavity and pushes the valve open which allows communication with the downstream side of the valve and allows the venting of the downstream side of the valve.
  • At least one pressure sensor is provided in the valve in the cavity in which the ball sits .
  • the pressure sensor can be provided to detect change in pressure of the fluid in the cavity and an increase in pressure of the fluid in the cavity indicating failure of the seal upstream of the ball.
  • the ball is capable of movement within the cavity of the valve and the sealing means upstream of the ball is capable of limited movement to and from said ball.
  • the ball, with the upstream sealing means in engagement therewith, is movable under the influence of the pressurised fluid onto the sealing means downstream of the ball which in turn is moveable to a limited extent in the valve.
  • the sealing relationship within the valve is formed between the seal upstream which is movable, the ball which is movable and the seal downstream which is movable such that the sealing effect can be created between the ball and the upstream and downstream seals.
  • the limited movement of the first and second seals in the valve is less than that for the sealing means in the conventional ball valve arrangements.
  • the sealing means positioned upstream of the ball is provided to be movable towards the ball under the influence of pressure at a first level applied by fluid in the pipeline flowing towards the valve, to form a first seal on the ball and the ball and said sealing means, with the first seal maintained, are provided to be movable towards the sealing means positioned downstream of the ball under the influence of said fluid at the same or greater pressure level to form the second seal.
  • a valve having at least one ball and first and second sealing means to provide seals on opposing upstream and downstream sides of the ball wherein the sealing means positioned upstream of the ball is provided to be movable towards the ball under the influence of pressure at a first level applied by fluid in the pipeline flowing towards the valve, and the ball and said sealing means are provided to be movable towards the sealing means positioned downstream of the ball under the influence of said fluid at the same or greater pressure level.
  • the ball and said sealing means are provided to move towards the sealing means downstream of the ball, when a pressure at a level greater than the first pressure level is reached.
  • FIGS. 2a and b illustrate a first embodiment of the invention in section
  • Figures 4a-c illustrate a further embodiment of the invention
  • Figures 5a-c illustrate a yet further embodiment of the invention
  • FIGS. 6a-c illustrate a yet further embodiment of the invention.
  • FIG. 8a-c illustrate a further embodiment of the invention
  • Figure 9a-c illustrate a further embodiment of the invention.
  • FIG 1 there is illustrated two prior art ball valve sealing systems.
  • a ball (a) mounted in the valve cavity, not shown, and in the figure I a there is shown the ball (a) with an upstream seal (b) and downstream seal (c) in the normal conditions in ambient pressure.
  • a liquid flows along the pipeline to which the valve is connected, as indicated by arrows (d) so pressure is applied to the ball (a) as indicated by the arrows (d) .
  • the ball effectively floats within the cavity of the valve, the ball is moved as indicated by arrows (e) towards the downstream seal (c) so that an effective seal at portion (f) is achieved.
  • this seal (f) fails then there is no longer any other seal in the valve such that the fluid can then flow through the seal and the valve is ineffective.
  • FIG. 1 there is illustrated an alternative ball valve arrangement wherein the ball (a) is again provided with downstream seal (b) and upstream seal (c) .
  • the ball is fixed in position and when fluid pressure is applied to the upstream seal (b) as indicated by arrows (d) then the upstream seal (b) moves as indicated by- arrows (e) against the ball to form the effective seal at portion
  • FIG. 2a and b there is illustrated a first embodiment of the invention which is shown in section along the longitudinal centre line of the valve body and shows the valve in a closed position in figure 2a and an open position is shown in Figure 2b with the fluid flowing through the valve as indicated by arrow 2.
  • the valve includes a valve body 4, and a valve stem 6 and handle arrangement 8 which is connected to operate a ball 10 and allow the same to be rotated in a cavity 12 between the closed position, in which the fluid is prevented from passing through the cavity in the valve, and an open position in which the fluid can pass through the port in the ball, through the cavity in the valve and hence downstream along the pipeline as shown in figure 2b.
  • valve Provided in location in the valve are an upstream sealing means or seat 14 and a downstream sealing means or seat 16.
  • the valve includes a number of other components provided to locate the various components in position but these components are largely conventional and therefore will not be described.
  • the upstream and downstream sealing means 14, and 16 are not providing a closing seal on the ball.
  • the pressure of the fluid entering the valve in the direction indicated by arrow 2 causes the upstream sealing means 14 to move towards the ball as indicated by arrow 16.
  • This movement creates a seal between the sealing means and the ball at the portion 1 8.
  • the movement of the sealing means 14 against the ball is provided to have a mechanical advantage in that the seal created with the ball is at a greater pressure than the pressure of fluid acting on the sealing means 14.
  • the sealing means 14 is capable of moving to a limited degree along the portion 20 of the valve body and is provided with piston seals 22 around the same.
  • the ball 10 is moveable within the cavity and therefore once the force of the sealing means on the ball has reached a certain pressure the sealing means 14 acts to move the ball 10 in the direction of arrow 24 within the cavity whilst maintaining the seal between the upstream sealing means 14 and the ball at portion 18.
  • a first sealing arrangement upstream of the ball and a second sealing arrangement downstream of the ball with both first and second seals being effective such that should a first seal fail then the other seal can still be maintained.
  • the provision of the movement of the upstream sealing means 14 onto the ball and the movement of the ball 10 onto the downstream sealing mean 16 with the upstream sealing means following the ball provides distinctive advantages. Firstly, there is provided a double seal arrangement in a valve body which only requires one valve ball arrangement.
  • FIGS 7a-c illustrate yet a further embodiment wherein there is provided a bleed port 44.
  • Figure 9a-c illustrate a further embodiment wherein there is provided a purge valve 60 both upstream and downstream of the ball 10 to allow the upstream portion 62 and downstream portion 38 to be purged separately as required.
  • Figure 10 indicates a further embodiment of the invention wherein there is provided an in line ball valve arrangement in accordance with the invention which, in this embodiment, shows two in line ball valve arrangements. The ball valve 10' is shown in a closed configuration and the upstream ball valve configuration 10 is shown in an open position thereby allowing the flow of liquid to the bleed port 34 to allow purging of the portion of the valve upstream from the ball valve 10'.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Taps Or Cocks (AREA)

Abstract

L'invention concerne une vanne que l'on peut installer sur une canalisation afin d'y contrôler le débit fluidique. La vanne comporte au moins une bille (10) dotée d'un premier moyen d'étanchéité (14) placé en amont de la bille et un second moyen d'étanchéité (16) placé en aval de celle-ci. Le premier moyen d'étanchéité se déplace sous l'effet de la pression fluidique vers la bille afin de former un joint étanche sur celle-ci, et ladite bille et le premier moyen d'étanchéité peuvent se déplacer sous l'effet du fluide en direction du second moyen d'étanchéité de façon à former un second joint étanche sur la bille; on obtient alors un double dispositif d'étanchéité à l'aide d'une seule bille en lieu et place des deux dispositifs à bille d'étanchéité classiques.
EP05786149A 2004-09-02 2005-09-01 Vanne Withdrawn EP1680614A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0419485A GB0419485D0 (en) 2004-09-02 2004-09-02 Improvements to valve
PCT/GB2005/003385 WO2006024860A1 (fr) 2004-09-02 2005-09-01 Vanne

Publications (1)

Publication Number Publication Date
EP1680614A1 true EP1680614A1 (fr) 2006-07-19

Family

ID=33155910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05786149A Withdrawn EP1680614A1 (fr) 2004-09-02 2005-09-01 Vanne

Country Status (3)

Country Link
EP (1) EP1680614A1 (fr)
GB (1) GB0419485D0 (fr)
WO (1) WO2006024860A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9518664B2 (en) 2015-05-04 2016-12-13 Rotex Manufacturers And Engineers Private Limited Combination sealing arrangement for rotary ball valve

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0908259D0 (en) 2009-05-14 2009-06-24 Xamol Ltd Valve assembly
FR2981720A1 (fr) 2011-10-25 2013-04-26 Total Sa Robinet d'isolement
GB2603669B (en) * 2019-10-11 2023-06-21 Halliburton Energy Services Inc Multi-ball valve assembly
US11781937B1 (en) 2022-03-25 2023-10-10 Duraseat Llc Valve seal integrity verification systems and methods

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890856A (en) * 1955-01-31 1959-06-16 Acf Ind Inc Spherical plug valve
AT272779B (de) * 1966-09-05 1969-07-25 Istag A G Suhr Ag Hahn mit Kugelküken
US4020864A (en) * 1975-07-16 1977-05-03 Church Jr Edgar H Ball valve
US4066240A (en) * 1976-06-01 1978-01-03 Acf Industries, Incorporated Self compensating seat for a spherical plug valve
US6128946A (en) * 1997-06-26 2000-10-10 Crane Nuclear, Inc. Method and apparatus for on-line detection of leaky emergency shut down or other valves

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006024860A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9518664B2 (en) 2015-05-04 2016-12-13 Rotex Manufacturers And Engineers Private Limited Combination sealing arrangement for rotary ball valve

Also Published As

Publication number Publication date
WO2006024860A1 (fr) 2006-03-09
GB0419485D0 (en) 2004-10-06

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