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WO1997019285A1 - Actuateur de vanne - Google Patents

Actuateur de vanne Download PDF

Info

Publication number
WO1997019285A1
WO1997019285A1 PCT/GB1996/002862 GB9602862W WO9719285A1 WO 1997019285 A1 WO1997019285 A1 WO 1997019285A1 GB 9602862 W GB9602862 W GB 9602862W WO 9719285 A1 WO9719285 A1 WO 9719285A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
drive member
base
lock mechanism
actuator
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.)
Ceased
Application number
PCT/GB1996/002862
Other languages
English (en)
Inventor
Martin James Wadsworth
Jeffrey Anthony Hughes
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.)
EJA Ltd
Original Assignee
EJA Engineering 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 EJA Engineering Ltd filed Critical EJA Engineering Ltd
Priority to AU76319/96A priority Critical patent/AU7631996A/en
Publication of WO1997019285A1 publication Critical patent/WO1997019285A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F16K35/00—Means to prevent accidental or unauthorised actuation
    • F16K35/06—Means to prevent accidental or unauthorised actuation using a removable actuating or locking member, e.g. a key

Definitions

  • the present invention relates to an actuator for controlling a valve, the actuator incorporating a locking mechanism to enable the valve to be locked in one or more predetermined configurations.
  • valves controlling different parts of the process are closed or opened in a predetermined ordei.
  • a known approach which has been used to ensure such valves are actuated in the appropriate order relies upon individual valve actuators being operable only after insertion of an appropriate key, the key for one valve in a particular series of valves only being accessible to an intended user after actuation of the previous valve in the se ⁇ es. For example, if one wishes to control the closing of three valves in the order one. two and three, the person responsible would retain a first key.
  • a second key would be locked into an actuator controlling the first valve, and a third key would be locked into an actuator controlling the second valve.
  • the first key When the user inserts the first key into the first valve actuator, this releases the actuator and enables that valve to be closed.
  • the second key Once the valve has been closed, the second key is released and may be taken to the second valve actuator.
  • the third key is released and may be moved to the third valve actuator to enable the associated valve to be closed.
  • an actuator for controlling a valve having a valve body and a valve stem the rotation of which relative to the body controls the valve comprising a base which in use is engaged with the body of a valve to be controlled such that the base is prevented from rotating relative to the valve body, a drive member which in use is mounted to rotate relative to the base with the stem of the valve to be controlled, a lock mechanism which is engaged with the drive member and is operable to lock the drive member and stem against rotation relative to the base, and means for applying a torque to the drive member and stem to control the valve, wherein the torque applying means is removable, at least one part of the lock mechanism is removable after removal of the torque applying means to thereby disable the lock mechanism, and the torque applying means is engageable with the drive member after removal of the said at least one part of the lock mechanism to enable actuation of the valve.
  • the torque applying means may be for example a lever which in effect pins the components of the actuator together.
  • a lever may be secured in its normal position by a removable component for example a seal, removal of which will be evident subsequently.
  • a locked valve may be released but only by a person prepared to make it apparent that the lock mechanism has been overridden.
  • the lever or other torque applying means could be secured in position by for example a frangible pin or other device displacement of which cannot readily be concealed.
  • the lock mechanism may comprise a lock body supporting at least one bolt which is displaceable with a key between a first position in which it engages in a recess in the base and a second position in which it enables rotation of the lock body with the drive member relative to the base.
  • the lock body may be received within a casing rotatably supported on the base, the lock body defining a recess within which the drive member is a sliding fit such that the lock body and drive member rotate together, the torque applying means extending through the casing to engage the lock body, and, after removal of the lock body, to engage the drive member.
  • the lock mechanism may define a bore through which the torque applying means normally extends, and the drive member may comprise formations between which the torque applying means normally extends.
  • Figure 1 is an exploded view of an embodiment of the present invention
  • Figure 2 is a further exploded view showing some of the components of Figure 1 and their relationship to a valve spindle;
  • Figure 3 is an underside view of a component shown in Figure 1 ;
  • Figures 4, 5 and 6 illustrate successive stages in the process of removing a lock mechanism from the structure of Figure 1 .
  • the illustrated embodiment of the invention comprises a base 1 , a drive member 2, a lock mechanism casing 3, a lock body 4 and a lever 5.
  • the base 1 defines a central circular bore 6 which receives a tubular extension 7 of the drive member 2.
  • the drive member 2 defines an axially extending bore the upper end of which defines a rectangular opening 8. That bore receives the spindle 9 of a valve, the end of the spindle being shaped to mate with the rectangular opening 8.
  • the spindle 9 extends from the body of a valve (not shown) to which the base 1 is secured.
  • the underside of the lock body 4 defines an opening 10 which receives the portion of the drive member 2 from which the extension 7 projects. That portion of the drive member includes four projections 1 1 one of which is located at each of the four corners of the generally rectangular opening 10.
  • the underside of the lock body 4 defines a track 12 in which a ball bearing 13 supported on the base 1 runs.
  • the underside of the lock body 4 also supports a pair of ball bearings 14 which in turn run in a track 15 provided on the base.
  • the positions of the bolts 16 and 17 relative to the cylindrical bores in the lock body 4 in which they are received can be controlled by keys.
  • a blanking plate 20 positioned over the bore which receives the bolt 17 isolates that bolt from any user intervention. Accordingly the bolt 17 will always be in a position in which it can move past the recess 17.
  • the other bolt 16 however can be rotated by means of a key 21 which may be inserted into the lock body through the protective cover 22 having a pivotably mounted lid and a lock barrel 23.
  • the key 21 thus enables the bolt 16 to be engaged in the recess 18 to lock the valve in one configuration or to be engaged in the recess 19 to lock the valve in an alternative configuration.
  • valve was to be used in a situation where a key was captive and could only be removed after appropriate positioning of the associated valve, a similar key would be provided to control the position of the bolt 17. the key being removable only after a rotation of the bolt 17 which would only be possible if the bolt 17 was adjacent to the recess 19.
  • This arrangement of captive keys is entirely conventional and will not therefore be described further.
  • the base 1 is secured to the valve body and the drive member 2 is secured to the valve spindle.
  • the casing 3 is rotatably supported by the base 1, separation of the casing 3 from the base 1 being prevented by three screws 24 the radially inner ends of which are engaged in a circumferential slot 25 in the base 1
  • the lock body 4 is pinned to the casing 3 by the lever 5 which extends through a radial opening 26 in the casing 3, a bore 27 in the lock body 4, and a further radial opening 28 in the casing 3.
  • Two circlips 29 and 30 are received in respective circumferential grooves in the lever 5, the circlip 30 being located immediately outside the casing 3 adjacent the opening 28 and the circlip 29 being located immediately outside the casing 3 adjacent the opening 26.
  • the lever extends between the projections 1 1 defined by the drive member 2.
  • the application of a force to the lever 5 applies a torque to the assembly made up of casing 3, lock body 4 and drive member 2 and that torque is delivered to the valve spindle 9 as a result of the inter-engagement between that spindle and the drive member 2.
  • the lever 5 In normal operation, the lever 5 will never be removed from the assembly.
  • the circlip may be covered by a seal such that once the circlip 30 has been removed it cannot be replaced without its earlier removal being evident.
  • the circlip 30 could be covered in a sealing compound.
  • the circlip could be replaced by a frangible member which could only be removed by being broken.
  • the lever 5 can be releasably retained against removal from the assembly in a manner such that if the lever is removed its removal is subsequently evident.
  • the lever In normal operation, the lever is retained in position and the valve is always left in a locked condition. Accordingly the valve can only be actuated by a person in possession of the key 21. If however in an emergency it becomes imperative to actuate the valve in circumstances when the key is not available, the circlip 30 is removed, for example by striking the adjacent end of the lever 5 with a hammer so that the circlip is dislodged, the lever 5 is pulled out of the assembly (sec Figure 4), the lock body 4 is lifted out of the casing, this being possible given that in the absence of the lever 5 there is no direct inter-engagement between the lock body 4 and either the casing 3 or the drive member 2, the lever 5 is reinserted though the openings in the casing 3 ( Figure 5), the reinserted lever extending between the projections 1 1 defined by the drive member 2 (see Figure 6).
  • the illustrated structure enables the locking mechanism to be removed completely from the assembly in an emergency but such removal will be evident assuming that an appropriate sealing structure is provided to indicate removal of the circlip 30.
  • an appropriate sealing structure is provided to indicate removal of the circlip 30.
  • alternatives to the circlip may be provided, for example a pin or other elongate member extending through a radial hole in the lever and secured against accidental removal by a tag or other breakable sealing device.
  • the casing 3 and lock body 4 could be a single component, providing the drive member is appropriately shaped so as to be engagable by the lever 5 after removal of the combined casing and lock mechanism.
  • the drive member could be provided with loop formations through which the lever would extend rather than spaced apart pairs of projections 1 1 as in the illustrated arrangement.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Preventing Unauthorised Actuation Of Valves (AREA)

Abstract

Actuateur de vanne verrouillable permettant d'empêcher la rotation d'une tige de vanne, à moins que l'actuateur n'ait été déverrouillé. L'actuateur comprend une base (1) montée sur le corps d'une vanne à commander, un élément d'entraînement (2) tournant par rapport à la base avec la tige (9) de la vanne, et un mécanisme de verrouillage engagé avec l'élément d'entraînement et intégrant un goujon (16) pouvant être placé dans une position bloquant le mouvement relatif entre la base et le mécanisme de verrouillage. Un levier (5) permet d'appliquer un couple de torsion sur l'actuateur, ce levier chevillant les éléments de l'actuateur ensemble. En cas d'urgence, le levier peut être retiré temporairement, ce qui permet de retirer le mécanisme de verrouillage, puis réengagé avec l'élément d'entraînement de façon à permettre l'actionnement de la vanne.
PCT/GB1996/002862 1995-11-22 1996-11-20 Actuateur de vanne Ceased WO1997019285A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76319/96A AU7631996A (en) 1995-11-22 1996-11-20 Valve actuator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9523878.8A GB9523878D0 (en) 1995-11-22 1995-11-22 Valve actuator
GB9523878.8 1995-11-22

Publications (1)

Publication Number Publication Date
WO1997019285A1 true WO1997019285A1 (fr) 1997-05-29

Family

ID=10784274

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/002862 Ceased WO1997019285A1 (fr) 1995-11-22 1996-11-20 Actuateur de vanne

Country Status (3)

Country Link
AU (1) AU7631996A (fr)
GB (1) GB9523878D0 (fr)
WO (1) WO1997019285A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG80668A1 (en) * 1999-02-11 2001-05-22 Cooper Cameron Corp Valve actuator with emergency shutdown feature
FR2917480A1 (fr) * 2007-06-13 2008-12-19 Securite Machines Systemes Sar Dispositif de verrouillage ou d'interverrouillage de securite pour vanne de canalisation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR583318A (fr) * 1923-09-11 1925-01-10 Wests Gas Improvement Co Ltd Perfectionnement aux robinets-valves
CH440887A (de) * 1966-10-17 1967-07-31 Nussbaum & Co Ag R Hahn
US3858843A (en) * 1973-03-29 1975-01-07 Chemetron Corp Ball valve and the like having locking handle
GB2168131A (en) * 1985-01-15 1986-06-11 Alan Elgar Herbert Ellis Lockable drive mechanism
EP0230117A2 (fr) * 1985-12-09 1987-07-29 Castell Safety International Limited Dispositif de serrage
GB2254103A (en) * 1991-03-18 1992-09-30 Joseph Philip Morrison Locking mechanism for a valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR583318A (fr) * 1923-09-11 1925-01-10 Wests Gas Improvement Co Ltd Perfectionnement aux robinets-valves
CH440887A (de) * 1966-10-17 1967-07-31 Nussbaum & Co Ag R Hahn
US3858843A (en) * 1973-03-29 1975-01-07 Chemetron Corp Ball valve and the like having locking handle
GB2168131A (en) * 1985-01-15 1986-06-11 Alan Elgar Herbert Ellis Lockable drive mechanism
EP0230117A2 (fr) * 1985-12-09 1987-07-29 Castell Safety International Limited Dispositif de serrage
GB2254103A (en) * 1991-03-18 1992-09-30 Joseph Philip Morrison Locking mechanism for a valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG80668A1 (en) * 1999-02-11 2001-05-22 Cooper Cameron Corp Valve actuator with emergency shutdown feature
FR2917480A1 (fr) * 2007-06-13 2008-12-19 Securite Machines Systemes Sar Dispositif de verrouillage ou d'interverrouillage de securite pour vanne de canalisation
EP2003382A3 (fr) * 2007-06-13 2009-07-29 Securite Machines Systemes Dispositif de verrouillage ou d'interverrouillage de sécurité pour vanne de canalisation

Also Published As

Publication number Publication date
AU7631996A (en) 1997-06-11
GB9523878D0 (en) 1996-01-24

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