WO2007036731A1 - A gate valve assembly - Google Patents
A gate valve assembly Download PDFInfo
- Publication number
- WO2007036731A1 WO2007036731A1 PCT/GB2006/003622 GB2006003622W WO2007036731A1 WO 2007036731 A1 WO2007036731 A1 WO 2007036731A1 GB 2006003622 W GB2006003622 W GB 2006003622W WO 2007036731 A1 WO2007036731 A1 WO 2007036731A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stem
- gate
- valve assembly
- assembly according
- gate valve
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract description 59
- 238000013519 translation Methods 0.000 claims abstract description 4
- 230000004044 response Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000020347 spindle assembly Effects 0.000 description 14
- 238000012856 packing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0254—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor being operated by particular means
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/52—Mechanical actuating means with crank, eccentric, or cam
- F16K31/523—Mechanical actuating means with crank, eccentric, or cam comprising a sliding valve
-
- 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
- F16K39/00—Devices for relieving the pressure on the sealing faces
- F16K39/04—Devices for relieving the pressure on the sealing faces for sliding valves
Definitions
- the present invention relates to a gate valve assembly and more particularly, but not exclusively, to a small-bore gate valve assembly for use in sub-sea applications in the gas and oil industry.
- Gate valves are commonly used in the gas and oil industry to isolate fluid pipelines in sub-sea well christmas tree valve blocks. They comprise a sliding valve gate that is moved to open or close the fluid line and an actuating spindle connected to the gate. Rotation of the spindle is converted into linear sliding movement of the valve in order to operate the valve.
- a conventional gate valve requires multiple rotations of the actuating spindle to move the gate from open to closed positions and vice versa.
- Small-bore gate valves used in the branch lines of sub-sea trees lend themselves to actuation by ROVs.
- An example of a gate valve assembly of this kind described above is disclosed in our international patent application WO 2004/003411.
- the valve assembly has a rotary spindle for operating the gate valve and a mechanism for converting the rotary movement into a linear sliding movement of the gate.
- the direction of movement of the gate is transverse to the axis of rotation of the spindle.
- Ia gate valves of this kind a stem sealing arrangement provides a barrier between the fluid being transported in the pipeline and the environment in which the valve is located, hi order to effect linear movement of the gate valve it is necessary to overcome three principal forces: a friction force between the valve and its seats; a friction force between the stem seal and the stem, which is dependent oh the diameter of the stem; and a stem ejection force imparted by the fluid being transported on one end the stem.
- the relatively small size of gate means that it is the stem ejection force that is the more significant of the three forces and such valve assemblies tend to be disproportionately larger and more expensive than larger gate valves.
- a gate valve assembly comprising a valve body with a fluid conduit therethrough, a valve gate mounted in said fluid conduit for movement in a direction transverse to said conduit between an open position whereby fluid can flow through said conduit and a closed position whereby the gate blocks said conduit and fluid flow is prevented, a stem slidable in a stem bore in the valve body and connected to said gate, the stem being slidable to move the gate between the open and closed positions, a first chamber defined between a first end of the stem and the valve body, the first chamber being sealed by a first seal between said first end of the stem and the stem bore, a second chamber defined between a second end of the stem and the valve body, a second chamber being sealed by a seal between said second end of the stem and the stem bore, a passage extending through the stem and interconnecting the first and second chambers so that, in use, the fluid pressure in each chamber is substantially equalised, first actuating means for moving the stem in a first direction so as to move the gate between the open
- the third chamber may be defined by a radial clearance between part of the stem and part of the stem bore.
- the stem preferably comprises a central portion flanked by first and second outer portions that respectively define said first and second ends, the central portion being of greater diameter than the outer portions.
- the stem bore may have a corresponding central portion that receives the central portion of the stem and is flanked by outer first and second bore portions that each have a diameter less than that of the central portion of the stem bore.
- the central portion of the stem is shorter in length than the central portion of the stem bore so as to permit relative translating movement.
- the stem may be stepped between the central portion and either of the first and second portions so as to define said working surface, the surface being in the form of an annular face that extends in a plane substantially perpendicular to the plane occupied by the axis of the stem.
- the second actuator may be a biasing member, such as a spring or the like, that may extend between the stem and a wall of the valve body.
- the stem may have a counterbore in which the biasing member is received.
- the spring is designed to bias the gate to an open or closed position and the spring force is pre-selected to overcome at least part of the friction forces between the gate and any surroundings and those between the stem and any seals.
- the second actuator may, alternatively or in addition, be a fourth chamber defined between the stem and the body on an opposite end of the stem to the third chamber, the fourth chamber being sealed between a working surface of the stem and the stem bore, and a port that is connectable to a source of control fluid. Hydraulic control fluid may thus be selectively injected under pressure into the third or fourth chambers to control the position of the stem and therefore the gate.
- Hydraulic control fluid may thus be selectively injected under pressure into the third or fourth chambers to control the position of the stem and therefore the gate.
- the diameters of the first and second outer portions of the stem may not be not equal so that the stem acts as a differential piston with the fluid acting at each end of the stem with equal pressure applying unequal forces and thus moving the stem and gate in a predetermined direction. This force applied by virtue of the differential piston can be applied in addition to the spring force so as to assist in overcoming friction forces.
- a rotary actuator for effecting movement of the gate between said open and closed positions, and a connection between the rotary actuator and the gate for converting rotational movement of the actuator into a translation movement of the gate.
- the rotary actuator is intended for use as an override actuator and may be operated manually or by a ROV.
- the direction of movement of the gate may be substantially perpendicular to the axis of rotation of the actuator.
- connection between the rotary actuator and the gate may configured to move the gate member from open to closed positions or vice versa in response to a predetermined angle of rotation of the actuator which predetermined angle may be 90, 180 or 270 degrees.
- the rotary actuator may be provided with a position indicator from which it can be identified whether the valve is open or closed.
- a stop may be provided to prevent rotation of the actuator beyond a predetermined angle which may be, for example, 90, 180 or 270 degrees.
- the rotary actuator may have a radially extending member for abutment with the stop.
- connection between the rotary actuator and the gate may be in the form of an eccentrically mounted member on said actuator and a slot associated with said stem, the eccentrically mounted member being received in said slot.
- the passage may extend through the central portion of the stem and one of said first and second outer portions.
- the passage may extend between an end of the second outer portion of the stem and an annular surface defined by a stepped transition between the central portion and the first outer portion
- the gate may comprise a sliding member with a bore therethrough, the bore being aligned with the flow conduit when the gate is in the open position and offset from the conduit when in the closed position.
- Figure 1 is a longitudinal sectioned view through a gate valve assembly in accordance with the present invention and with the valve shown in an open position;
- Figures 2 to 4 are diagrammatic representations of the valve assembly of figure 1 illustrating movement of the valve gate member and rotation of a rotary override spindle;
- Figure 5 is a side view of the valve assembly of figure 1, the assembly having been rotated through ninety degrees;
- Figure 6 is a plan view of the assembly of figure 5.
- Figure 7 is a plan view of the valve assembly shown fitted with an indicator plate.
- the exemplary sub-sea gate valve assembly comprises a multiple part housing 1 defining a fluid flow passage 2 that is interrupted by a valve chamber 3 and in which there is disposed a slidable valve gate 4 that serves to open or close the flow passage 2.
- the valve gate 4 is connected to an end of a stem 5 that is slidably received in a stem bore 6 and which extends in a direction perpendicular to the flow passage 2, along the majority of valve body.
- the stem 5 is designed to reciprocate along its central longitudinal axis in the stem bore 6 so as to move the gate 4 relative to the passage 2. .
- a spindle bore 7 penetrates the housing 1 in a direction parallel to the fluid flow passage 2 and intersects the stem bore 6 at a location spaced from the valve chamber 3.
- the spindle bore 7 receives a rotary spindle assembly 8 that engages with the stem 5 and serves as an override actuator by which the valve can be opened or closed manually or by a remote controlled device such as a ROV.
- the housing 1 comprises a valve body 10, an actuator body 11, a valve bonnet 12 that separates the bodies, and a cylindrical end cap 13.
- the valve body 10 defines the valve chamber 3 and the fluid flow passage 2, whereas the actuator body 11 defines the intersection between the stem bore 6 and the spindle bore 7.
- the bonnet 12 simply defines part of the stem bore 6 that connects with the valve chamber 3.
- the end cap 13 houses the end of the stem 5 opposite the valve gate 4, seals to the actuator body and is retained there by a collar 14.
- the actuator body 11 supports a bearing housing 19 with an internal bore that defines a continuation of the spindle bore 7 and receives an upper portion of the spindle assembly 8 that will be described in more detail below.
- the valve gate 4 comprises a generally rectangular member with a bore 20 therethrough.
- Two annular seats 21 support the gate 4 and are received in annular recesses in the chamber 3.
- the seats 21 are penetrated by interior bores 22 that correspond in diameter to that of the fluid passage 2 and therefore effectively extend the fluid passage 2 across the chamber 3.
- Annular seals 23 seal the seats to the valve housing 1.
- the valve gate 4 is shown in an open position whereby its bore 20 is in coaxial register with the fluid flow passage 2 and the seat bores 22. Sliding movement of the gate 4 to the right in figure 1 in a direction perpendicular to the longitudinal axis of the fluid passage 2 moves the bore 20 in the gate 4 out of register with the flow passage 2 so that the gate the flow of fluid through the passage and the valve is closed.
- the sliding movement of the valve gate 4 is driven by the reciprocating stem 5, the gate 4 being secured to an end of the stem by a cylindrical connection 24 of T-shaped cross-section.
- the stem 5 is generally cylindrical in shape and is stepped so as to define a central portion 25 of enlarged diameter that is flanked by first and second outer portions 26, 27 of slightly reduced diameter.
- the stem bore 6 is stepped with a central portion 28 having an internal diameter marginally greater than the outside diameter of the central portion 25 of the stem 5 but longer in length to allow reciprocal movement of the stem 5 in the bore 6.
- the first outer portion 26 of the stem is sealed to the stem bore 6 by packing seals 29 that are received in annular grooves on the inside surfaces of the end cap 13, whereas the second outer portion 27 of the stem 5 is similarly sealed by packing seals 30 received in annular grooves in the actuator body 11 and the bonnet 12.
- the cylindrical end cap 13 houses the first outer portion 26 of the stem 5 and is sealed thereto by means of an annular sliding packing seal 31 that is disposed in a circumferential groove defined in the stem 5.
- This seal is a spring-energised U-cup seal of known configuration and is the primary packing seal with seals 29 serving as a back-up.
- a similar seal 31a is provided at the other end of the stem and serves to seal the stem bore 6 from the valve chamber 3.
- a clearance between an end wall 32 of the cap 13 and the stem 5 serves to define a variable volume fluid chamber 33, the purpose of which will become clear.
- the first outer portion 26 of the stem 5 has a counterbore 34 (shown in dotted line in figure 1) therethrough that extends into part of the central portion 25 of the stem 5.
- This counterbore provides a seat for a compression spring 35 (represented in dotted line in figure 1) that is disposed coaxially in the stem bore 6 and the fluid chamber 33 and extends between the end wall 32 of the cylindrical end cap 13 and an end wall of the counterbore 34.
- the spring 35 urges the stem 5 towards the valve chamber 3 so as to move the gate 4 out of alignment with the flow passage 2 and to close the valve.
- the stem 5 is connected to the spindle assembly 8 at an upper surface of the central portion 25, which is recessed.
- a transverse slot 36 for receipt of a crank pin 37 having an outer roller bearing 37a and which is eccentrically mounted on the end of the spindle assembly 8.
- the slot 36 and pin 37 operate in the manner of a scotch yoke mechanism.
- the crank pin may be in the form of a sliding block.
- the spindle assembly 8 has an inner spindle 38 that extends into the bore of the bearing housing 19 and interfaces with the stem recess, and an outer spindle 39 that extends out of the housing 19 and is connected to the inner spindle 38. Both spindles 38, 39 are prevented from moving in an axial direction, the outer by a radially outward extending flange 40 that is flanked by a first set of bearings 41 that serve to support the spindle assembly 8 in rotation.
- the upper end of the outer stem 39 projects from the cover housing and terminates in a spindle 42 of square cross-section.
- Such a spindle 42 is intended for connection to an extension rod (not shown) of the kind that is designed to interface with a ROV panel and enable actuation of the stem assembly 8 by the ROV,
- the inner stem 38 is supported for rotation in a concentric sleeve bearing 43 and terminates in the crank pin 37.
- the spindle assembly 8 is sealed by a seal set around the inner spindle and is retained in the bearing housing 19 by four capped screws 56 (shown in figure 6 only).
- valve chamber 3 will be flooded with the fluid that flows in the flow passage 2 and, ordinarily, would apply a force to the stem 5 in a direction counter to the force applied by the spring 35.
- a pressure balance passage 45 (represented in dotted line) in a radially outer part of the stem 5 that interconnects the valve chamber 3 with the fluid chamber 33 defined by the end cap 13.
- the pressure balance passage 45 extends through the second outer portion 27 and the central portion 25 of the stem 5 and emerges at a step 46 defined between the central portion 25 and the first outer portion 26 of the stem 3.
- the fluid thus flows from the valve chamber 3 via the passage 45 and into the spring chamber 35.
- the effective diameters 0A and 0B of the ends of the stem 5 are equal so that the forces applied by the same fluid pressure on each end of the piston are equal.
- the piston is in balance and there is no stem ejection force.
- the only variable force that acts counter to the spring force is that provided by the friction between the gate valve 4 and seats 21 and provided between the packing seals 29, 30 and stem 5.
- the effective diameter 0B may be greater than 0A in which case the stem operates as a differential piston and is urged towards the valve chamber 3 as the fluid pressure in the respective chambers 3, 33 is equal.
- the piston arrangement is configured so that the force that urges the stem 5 in this direction is sufficient to overcome the gate to seat friction and thus move the gate 4 to the closed position.
- the spring force dominates and serves to move the gate 4 to the closed position.
- the differential piston areas offered by the stem 5 can be configured to allow the valve to close without spring assistance when the fluid reaches a certain pressure.
- the central portion 25 of the stem 5 is shorter in length than the central portion of the stem bore 6, there is a working chamber 47 defined between the two.
- External hydraulic control fluid can be supplied under pressure to this working chamber 47 via a supply port 48 through the valve body in order to move the stem.
- the fluid in the chamber 47 is sealed against egression by an annular seal 49 disposed in an annular groove in the circumferential surface central portion 25 and by the stem packing seals 30. Since the fluid pressure acts on the radially extending annular face 50 provided by the stepped transition between the central 25 and second outer portion 27 of the stem 5 it urges the stem in the direction against the spring force.
- the stem 5 carries the valve gate 4 with it and so the bore 20 is moved to the left and into communication with the fluid passage 2.
- Rotation of the stem assembly 8 is restricted to 180° by virtue of the engagement of a pin 60, which extends perpendicularly from the spindle 42, with stops 61, 62, as is shown in figure 6.
- a pin 60 which extends perpendicularly from the spindle 42, with stops 61, 62, as is shown in figure 6.
- the valve gate 4 is at the limit of its travel and is either in the open position as shown in figure 1 and 4 or the closed position shown in figure 2.
- An intermediate position is illustrated in figure 3.
- the pin 60 is replaced with a stop plate 70 that is carried by the spindle 42 for rotation with the assembly 8.
- the plate 70 is formed from a circular disc that is cut-away to defined two radial edges 71 for engagement with the stop pin 61.
- the interaction of the stop pin 61 and the plate 70 restrict the rotational movement of the stem assembly 8.
- one of the edges 71 engages the stop pin 61 to prevent further rotation of the stem assembly in the anticlockwise direction. In this position the valve is open.
- the upper surface of the bearing housing 19 is labelled with status indicators OPEN and CLOSED at diametrically opposite locations.
- the plate When the valve is in the open position as shown in figure 7, the plate conceals the CLOSED label (this is shown in faint lettering in the figure to aid understanding) but not the OPEN label and vice-versa when the valve is closed. This enables the status of the valve to be monitored by easily.
- the spindle assembly 8 is used as an override actuator to effect valve opening or closure in the absence of a hydraulic control fluid, whereby rotation of the spindle assembly effects sliding movement of the stem 5 and valve gate 4 via the scotch yoke mechanism.
- the half turn movement required to move the valve between the open and closed positions makes it easy to operate and particularly suitable for actuation by a ROV.
- connection between the spindle assembly 8 and the stem 5 may take any appropriate form that provides conversion from rotational movement to translating movement and provides the potential for the gate to be moved from open to closed positions or vice versa in 180° of rotation of the spindle assembly.
- the connection may be configured to provide for movement of the gate between the open and closed position in response to 90° or 270° rotation of the spindle assembly.
- One example of an alternative mechanism is described in WO 2004/003411 in relation to figure 7.
- the roller bearing of the crank pin 37 may take the form of a plain bearing or a rectangular slider bearing.
- the hydraulic control fluid is supplied to both sides of the central portion 25 of the stem 5 so that it serves as a double-acting piston arrangement.
- an additional port 55 is provided in the body to supply control fluid to a second working chamber on the other side of the piston.
- hydraulic control fluid can be supplied under pressure to the second chamber to urge the stem 5 towards the valve chamber 3 so that the gate 4 is moved from the open to the closed position, rather than relying on the spring force and a differential piston arrangement to achieve this.
- valve assembly 8 may be used to control the flow of fluid through any flow line.
- transverse slot 36 may be of any appropriate form.
- arrangement of the valve assembly may be configured so that the spring 35, and any force applied by virtue of fluid acting on the differential piston surfaces of the stem, serve to bias the stem and valve gate to a normally open position.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanically-Actuated Valves (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0804085A GB2443379B (en) | 2005-09-29 | 2006-09-28 | A gate valve assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0519772.8A GB0519772D0 (en) | 2005-09-29 | 2005-09-29 | A gate valve assembly |
GB0519772.8 | 2005-09-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007036731A1 true WO2007036731A1 (en) | 2007-04-05 |
Family
ID=35394912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2006/003622 WO2007036731A1 (en) | 2005-09-29 | 2006-09-28 | A gate valve assembly |
Country Status (2)
Country | Link |
---|---|
GB (2) | GB0519772D0 (en) |
WO (1) | WO2007036731A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111537136A (en) * | 2020-06-05 | 2020-08-14 | 安徽威特仪表科技有限公司 | Air pressure detecting meter |
WO2024061190A1 (en) * | 2022-09-22 | 2024-03-28 | 浙江三花汽车零部件有限公司 | Valve device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3765642A (en) * | 1971-09-29 | 1973-10-16 | Texas Iron Works | Valve and actuator assembly |
US4412671A (en) * | 1980-11-26 | 1983-11-01 | Sulzer Brothers Limited | Plate valve |
EP0326787A1 (en) * | 1988-02-04 | 1989-08-09 | GebràDer Sulzer Aktiengesellschaft | Gate valve |
US6125874A (en) * | 1999-06-21 | 2000-10-03 | Dril-Quip, Inc | Gate valve having fail safe actuator |
US20030062502A1 (en) * | 2001-10-03 | 2003-04-03 | Itt Manufacturing Enterprises, Inc. | Ported slide gate valve with gate motion to break scale build up |
WO2004003411A1 (en) * | 2002-06-27 | 2004-01-08 | Oliver Valvetek Limited | A gate assembly |
-
2005
- 2005-09-29 GB GBGB0519772.8A patent/GB0519772D0/en not_active Ceased
-
2006
- 2006-09-28 WO PCT/GB2006/003622 patent/WO2007036731A1/en active Application Filing
- 2006-09-28 GB GB0804085A patent/GB2443379B/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3765642A (en) * | 1971-09-29 | 1973-10-16 | Texas Iron Works | Valve and actuator assembly |
US4412671A (en) * | 1980-11-26 | 1983-11-01 | Sulzer Brothers Limited | Plate valve |
EP0326787A1 (en) * | 1988-02-04 | 1989-08-09 | GebràDer Sulzer Aktiengesellschaft | Gate valve |
US6125874A (en) * | 1999-06-21 | 2000-10-03 | Dril-Quip, Inc | Gate valve having fail safe actuator |
US20030062502A1 (en) * | 2001-10-03 | 2003-04-03 | Itt Manufacturing Enterprises, Inc. | Ported slide gate valve with gate motion to break scale build up |
WO2004003411A1 (en) * | 2002-06-27 | 2004-01-08 | Oliver Valvetek Limited | A gate assembly |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111537136A (en) * | 2020-06-05 | 2020-08-14 | 安徽威特仪表科技有限公司 | Air pressure detecting meter |
WO2024061190A1 (en) * | 2022-09-22 | 2024-03-28 | 浙江三花汽车零部件有限公司 | Valve device |
Also Published As
Publication number | Publication date |
---|---|
GB0519772D0 (en) | 2005-11-09 |
GB0804085D0 (en) | 2008-04-09 |
GB2443379B (en) | 2010-05-05 |
GB2443379A (en) | 2008-04-30 |
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