GB2034442A - Butterfly valve - Google Patents
Butterfly valve Download PDFInfo
- Publication number
- GB2034442A GB2034442A GB7936610A GB7936610A GB2034442A GB 2034442 A GB2034442 A GB 2034442A GB 7936610 A GB7936610 A GB 7936610A GB 7936610 A GB7936610 A GB 7936610A GB 2034442 A GB2034442 A GB 2034442A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- sealing ring
- ring
- sealing
- axis
- 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.)
- Granted
Links
- 238000007789 sealing Methods 0.000 claims abstract description 120
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 13
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004513 sizing 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2261—Shaping or arrangements of the sealing the sealing being arranged on the valve member
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
A butterfly valve member 4 pivotally mounted in a valve casing providing a valve seat has a peripheral sealing ring 6, for engagement with the valve seat, ring 6 being located in an annular groove 7 around the valve member. The sealing ring 6, in axial section, has the form of a 'U' with the base of the 'U' radially outermost and the limbs of the 'U' extending from the base of the 'U' towards the axis of the ring. An incompressible support ring 10 is disposed within the ring 6 between the parts providing the arms of the 'U'. In use the parts of the ring 6 providing the arms of the 'U' normally bear sealingly on the side walls of the groove 7 or on seals provided on these side walls but can be deflected resiliently whereby, in the closed position of the valve, the chamber defined between the ring 6 and groove 7 can be filled with the pressurised fluid upstream of the valve member and the ring 6 thereby expanded resiliently radially outwardly into more effective sealing engagement with the surface 5 of the valve seat formed in the valve casing. <IMAGE>
Description
SPECIFICATION
Butterfly valve
THIS INVENTION relates to butterfly valves, and to provisions made for sealing the valve member of a butterfly valve with respect to the valve casing thereof in the closed position of the valve.
Depending on what they are to be used for, but terflyvalves can be divided into those having metal sealing means and those having non-metallic sealing means. Non-metallic sealing means are cheaper and easier to produce than metal sealing means but they are limited to low-temperature and lowpressure applications, whereas metal sealing means can be used in heavily stressed fittings. Sealingtightness can be achieved, for instance, by a rigid disc formed by or carried by the valve member, having an accurately machined sealing profile engaging in a relatively rigid sealing member secured in the casing. If operation is to be satisfactory, the components must be produced to very high standards of precision; also, the valve member and the pivot shafts therefor must be very rigid and heavy.If the butterfly is bent by the pressure of fluid acting thereon, the result is bound to be leaks at the metal seal. Because of the increased friction in the valve member as a result of using a metal seal, relatively thick shafts are required to transmit the torque required to pivot the valve member between its open and closed positions, with the disadvantage that flow cross-sections in the valve are reduced and flow factors impaired. United Kingdom Patent Specification No. 197,000 discloses a construction suffering from this disadvantage wherein the pressure applied to the seal is also boosted by the pressure of the medium whose flow it is required to shut off.
Another disadvantage of this construction is that it has a divided sealing ring which increases leakage.
It is an object of the invention to provide a butterfly valve having a sealing arrangement which is simple to produce and which operates reliably at high pressures and in different temperature ranges.
According to the invention, there is provided a butterfly valve comprising a valve casing having a flow passage extending therethrough along an axis, a valve member mounted in the valve casing, for pivotal movement about a pivotal axis transverse to said axis of said flow passage, between an open position and a closed position, the valve member having a peripheral annular groove in which is disposed floatingly a sealing ring which in the closed position of the valve bears on a complementary sealing surface extending around the wall of said flow passage to seal with respect to one another the parts of the flow passage upstream and downstream of the valve member, the form of the sealing ring being such that in section in a plane which, in the closed position of the valve includes the axis of the latter, the valve is
U-shaped with the free ends of the arms of the U extending towards the axis of the flow passage, and thus towards the bottom of the annular groove in which the sealing ring is accommodated, the sealing ring, in the closed position of the valve being resiliently deformed radially inwardly towards the axis of said flow passage by said sealing surface of the valve casing, the arrangement being such that, in use of the valve, when the valve is in the closed position, the pressure with which the sealing ring bears on said sealing surface is boosted by the action of the pressure of the fluid upstream of the valve member.
The sealing ring may be an integral article of thin metal, which is deformable axially and radially and in its closed state bears resiliently on the sealing surface in the valve casing, the radial sealing surface of the sealing ring being of greater diameter than the complementary sealing surface of the associated seat in the valve casing, and an imcompressible support member being non-fixedly disposed in the
U-shaped chamber in the sealing ring.
This feature helps to provide a very simple but very reliable metal seal which can act in both directions of flow. Since the ring has a floating mounting, the higher medium pressure can act on the side surfaces of the resilient metal sealing ring. The side surface experiences compression or inwards pressure, but an incompressible insert in the ring permits such pressure only on a limited scale and enables the fluid medium - under higher pressure to enter the interior of the U-shaped ring. The pressure which builds up therein presses the ring axially towards the opposing side wall of the groove and radially outwards towards sealing surfaces on the valve casing.
Alternatively, the sealing ring may be made of
PTFE or a plastics having similar properties and its sealing surface may be in the form of a frusto-conical surface whose central diameter is greater than the diameter of the associated sealing surface. This embodiment can be used with advantage for butterfly valves intended for low-temperature uses.
Preferably, lateral seals are disposed between the arms of the U-section sealing ring and the sidewalls of the groove which receives the sealing ring. This feature reliably precludes any by-passing of the sealing ring. The sealing means can take the form of flat or round or similar seals.
Where a plastics sealing ring is used, the lateral seals may be integral with the sealing ring.
The sealing effect is further enhanced in embodiments where the sealing ring is of thin sheet metal, by calibrating the radially outwardly presented sealing surface of the sealing ring directly by means of the sealing surface of the complementary valve seat provided in the valve casing, i.e. by making the sealing ring plastically deformable to some extent and by forcing the sealing ring against the sealing surface of the valve seat in such a way as to deform the sealing ring plastically to conform closely with the valve seat surface.In a butterfly valve embodying the invention and having a valve member with a double eccentric mounting, wherein according to a preferred feature, the sealing surface in the casing has the form of part of the surface of a sphere the centre of which lies at the intersection of the pivotal axis of the flow passage through the valve with the pivotal axis of the valve member, such calibration can be carried out very readily. Because of the way in which it is produced, the U-section sealing ring has, in axial section, an arcuate radially outer zone via which it bears on the casing valve seat surface. The valve seat and the sealing ring are of a respective size and design such that, prior to calibration, the sealing ring is slightly oversize.The sealing ring is
deformed plastically radially inwardly, and thus cali
brated, the first time that it is forced into the valve seat surface when the valve is closed. The originally arcuate radially outer bearing surface of the sealing ring is thereby accurately adapted to the shape of the seat surface. Since the material used for the sealing ring has, with advantage, some resilience, and thus partially recovers shape in a resilient fashion to a limited degree after such calibration, the sealing ring always bears on the seat surface sealingly, in the closed position of the valve, because of its springiness after calibration. The pressure-boosting effect caused by the pressure of the fluid medium within the valve then merely has the effect of increasing the pressure with which the sealing surface of the sealing ring bears on the sealing surface of the valve seat.Calibration of the sealing ring improves the superficial contact area between the items to be sealed.
According to another preferred feature, the inner diameter of the U-shaped sealing ring is greater than that of the surface forming the bottom of the receiving groove, so that in the closed position of the valve, the ring is spaced radially outwardly from the bottom of said groove. This feature ensures bypassing of the respective part of the sealing ring providing the respective arm of the 'U' section, and therefore ensures a build-up of pressure in the sealing ring corresponding to the fluid pressure upstream of the valve member.
Embodiments of the invention are described below with reference to the accompanying drawings in which: Figure 1 is a view in section through a closed double-eccentric butterfly valve having a resilient metal seal;
Figure 2 is a view in section through the sealing part between the casing and the resilient metal seal before the first closure of the valve fitting;
Figure 3 is a view in section through the closed and calibrated sealing part;
Figure 4 is a sectional view corresponding to Figure 2 of a variant embodiment incorporating a plastics sealing ring, and
Figure 5 is a sectional view corresponding to Figure 3, of the variant of Figure 4, showing the valve in the closed position.
Figure 1 is a view in section, along the axis of the flow passage, through a double eccentric butterfly embodying the invention.
The valve comprises a generally annular casing 1 within which a valve member 4 is mounted, for pivoting about an axis perpendicular to the axis of the flow passage, via shaft portions 2 and 3 which are aligned with one another along the pivotal axis of valve member 4. The shaft portion 2 is rotatably supported in bearings in a boss formed on the casing 1, projects outwardly from said boss at its outer end for engagement by an operating member (not shown) and at its inner end projects into the flow passage into the valve member 4, relative to which the shaft portion 2 is fixed non-rotatably. The shaft portion 3 is received in a bore in the casing 1 diametrically opposite the bore in said boss and projects into the flow passage into a bearing formed in the member 4 so that the member 4 is pivotable around shaft portion 3.The major part of valve member 4 is disposed eccentrically with respect to the axis of shaft portions 2,3 and carries a sealing ring 6 which in the closed position of the valve cooperates with the sealing surface 5 of a valve seat formed around the flow passage in the valve casing. The surface 5 extends entirely around the axis of the flow passage and has the form of part of a sphere the centre of which lies on the intersection of the axis of shaft portions 2,3 with the axis of the flow passage through the valve casing.
Sealing ring 6, which extends around the periphery of the valve member 4 is received floatingly in a radially outwardly open annular groove 7 formed around the valve member 4 and defined between a major component of the valve member and a ring 9 secured to said major component by screws 8.
The form of the ring 6 is such that in section along its axis, i.e. in section along the axis of the flow passage through the valve, when the valve is closed, the ring has the form of a 'U' which is disposed with its base radially outermost relative to the axis of the flow passage and with the arms of the 'U' extending radially inwardly from said base towards the bottom of the groove 7. Received non-fixedly within the ring 6, and disposed radially inwardly of the portion providing the base of the 'U', and between the portions providing the arms of the 'U', is an incompressible support or bearing member 10. Furthermore, a respective flat annular sealing element 11 is provided between each of the portions which provides a respective side wall of the 'U' and the adjoining side wall of the groove 7.A sealing ring 12 disposed in a corresponding annular passage defined, radially inwardly of groove 7, between a groove in a face of the major component of member 4 and the opposing face of ring 9 provides a seal which prevents flow between ring 9 and said major component in the radial direction past ring 12.
Figure 2 is a view, in section along the pivotal axis of the valve member and transverse to the axis of the flow passage of the valve casing, showing, to an enlarged scale, as compared with Figure 2, a portion of the valve of Figure 1, in the open position thereof, including the sealing parts thereof prior to the first occasion on which the valve is closed after manufacture and assembly.
The ring 6 is so formed in manufacture that, at this stage, in section along the axis of the ring the base 13 of the 'U' shaped-section is in the form of an arc of a circle. The ring 6, at this stage, has an outer diameter greater than the diameter, (perpendiculartothe flow passage axis), of the part of the sealing surface 5 which it will engage in the closed position of the valve. The ring 6 is formed of a material, which may be a metal, which is plastically deformable in a permanent manner but has a certain inherent resilience and tendency to resilient recovery after deformation.
Figure 3 shows how the ring 6 is calibrated or sized to its operative shape the first time the valve is closed. Thus, closure of the valve forces the ring 6 into the appropriate part of the sealing surface 5 so that the portion 13 is deformed to the shape shown and is thereby adapted to the spherical contour of surface 5, the deformation being in the main permanent plastic deformation but to some extent resilient deformation so that on moving the valve member 4 to the open position once more the ring 6 springs resiliently outwardly to some extent. Thus in the closed position of the valve the ring 6 always bears resiliently and uniformly against surface 5 to ensure adequate sealing.
The pressure with which the ring 6 bears against surface 5 is increased, in operation, in the following manner:
When in the closed position of the valve, the net positive pressure of the fluid medium in the pipe-line or the like in which the valve is installed acts on the valve member in the direction indicated by the arrow
A, (Figures 1 and 3) the portion 14 of the ring which affords one limb of the 'U' in section bears on member 10 and the medium flows into the chamber bounded by groove 7 and ring 6 until the same medium pressure as is operative on the higher pressure side of the valve has built up in the latter chamber. The member 10, which is not designed to provide sealing-tightness, enables the pressure to build up in the sealing ring without disturbance.
Since the ring 10, which can comprise one or more elements, is incompressible, the ring 6 can merely be resiliently deformed radially but it cannot be further compressed axially. The flat seals 11 used in this case ensure that the ring 6 cannot be bypassed from the higher pressure side of the valve member to the lower pressure side. Because of the pressure difference in the sealing ring, the portion 15 of the ring 6 which affords the other limb of the 'U' in section bears sealingly on flat seal 11. If the higher medium pressure was operative on the other side of the valve member, i.e. acting in the direction of arrow B in Figure 1, the portion 14 would cooperate with the flat seal 11 to prevent bypassing.
The system provides equivalent reliable sealing in both directions of flow because, owing to the resilience of the sealing ring, when the pressure is operative in the direction of arrow A and tends to force valve member4 and sealing ring 6 away from surface 5, the sealing ring, by varying its outer diameter because of the pressure within it, can compensate for the increased tolerance. When the pressure is operative from the side B, the butterfly and sealing ring are pressed into the sealing surface. The ring yields like a spring so that the torque required to open or close the valve is not increased.
Figures 4 and 5 show a variant which differs from the embodiment described with reference to Figures 1 to 3 only in the nature of the sealing ring, (again referenced 6) and the associated parts. In the variant of Figures 4 and 5, the sealing ring 6 is again, in section along the axis of the ring, of 'U' shape with the base of the 'U' being radially outermost and the arms of the 'U' extending radially inwardly from the base of the 'U' towards the bottom of the groove 7.
However, in the variant of Figures 4 and 5, the sealing ring 6 is made of PTFE or a plastics having similar properties. The ring 6 is again mounted floatingly in groove 7 in the valve member. No separate lateral sealing element, such as elements 11 in Figures 1 to 3, are provided in this construction since in this case the parts of the ring 6 which form the limbs of the 'U' cooperate sealingly with the respective sidewalls 16 or 17 of the groove 7. The seal operates just as in the embodiment shown in Figures 1 to 3 but with a different kind of calibration or sizing.The outwardly facing surface 18 of the ring 6 in Figures 4 and 5 is frusto-conical and is of larger diameter mid-way between its axial ends, in the unstressed state of the ring, than the part of the spherical sealing surface 5 of casing 1 engaged by the part of the ring 6 midway between the axial ends of the ring in the closed position of the valve, the diameters in each case being measured perpendicular to the axis of the flow passage of the valve. When the ring 6 engages in the surface 5, on closing the valve, the edges 19, 20 of the ring 6 which are at the axial extremes of said frusto-conical surface, and the portions of the ring which adjoin said edges 19, 20, deform so that the frusto-conical shape is adapted to the spherical shape of the sealing surface 5. The sealing ring may or may not have the incompressible member 10, non-fixedly disposed within the ring 6, depending upon the pressure relationships operative in the fitting.
Both in the embodiment of Figures 1 to 3 and in that of Figures 4 and 5, the internal diameter of the sealing ring, i.e. of the portion providing the free ends of the arms of the 'U' section, is greater than the diameter of the surface forming the bottom of the groove 7, so that in the closed position of the valve said portions providing the free ends of the arms of the U are spaced radially outwardly from the bottom of said annular groove.
Claims (12)
1. A butterfly valve comprising a valve casing having a flow passage extending therethrough along an axis, a valve member mounted in the valve casing, for pivotal movement about a pivotal axis transverse to said axis of said flow passage, between an open position and a closed position, the valve member having a peripheral annular groove, in which is disposed floatingly a sealing ring which in the closed position of the valve bears on a complementary sealing surface extending around the wall of said flow passage to seal with respect to one another the parts of the flow passage upstream and downstream of the valve member, the form of the sealing ring being such that in section in a plane which, in the closed position of the valve includes the axis of the latter, the valve is U-shaped with the free ends of the arms of the U extending towards the axis of the flow passage, and thus towards the bottom of the annular groove in which the sealing ring is accommodated, the sealing ring, in the closed position of the valve being resiliently deformed radially inwardly towards the axis of said flow passage by said sealing surface of the valve casing, the arrangement being such that, in use of the valve, when the valve is in the closed position, the pressure with which the sealing ring bears on said sealing surface is boosted by the action of the pressure of the fluid upstream of the valve member.
2. Avalve according to claim 1 in which the sealing ring is an integral member of thin metal, and is deformable axially and radially; the radial sealing surface of the sealing ring being of greater diameter than that of the corresponding sealing surface in the valve casing; the sealing ring being mounted floatingly in said groove in the valve member, and an incompressible support member being non-fixedly disposed within the channel defined within the sealing ring between the portions defining said arms.
3. Avalve according to claim 1 in which the sealing ring is made of a resilient plastics material and its sealing surface is frusto-conical in form and, at a position mid-way therealong has a diameter greater than the diameter of the part of the sealing surface of the valve casing engaged by the portion of the sealing surface of the sealing ring which is at said position mid-way along said sealing surface of the ring.
4. A valve according to claim 3 wherein the sealing ring is of PTFE.
5. A valve according to claim 1,2,3 or 4 in which lateral seals are disposed between the sidewalls of the groove which receives the sealing ring and the portions of the sealing ring which provide the arms of the 'U' in section through the ring.
6. A valve according to claim 5 when dependent on claim 3 or4, in which said lateral seals are integral with the sealing ring.
7. Avalve according to any preceding claim in which the radially outwardly presented sealing surface of the U-section sealing ring has been formed to size by and thus calibrated by engagement with the sealing surface of the valve casing.
8. Avalve according to any preceding claim in which the sealing surface in the valve casing is formed as part of the surface of a sphere whose centre lies at the intersection of the pivotal axis of the valve member with the axis of the flow passage through the valve casing.
9. A valve according to any preceding claim wherein the internal diameter of the sealing ring is greater than the diameter of the surface forming the bottom of said groove so that in the closed position of the valve the portions of the sealing ring providing the free ends of the arms of the 'U' in section through the ring are spaced radially outwardly from the bottom of said annular groove.
10. Avalve substantially as hereinbefore des cribedwith reference to and as shown in, Figures 1,2 and 3 of the accompanying drawings.
11. A valve substantially as hereinbefore described with reference to and as shown in, Figures 4 and 5 of the accompanying drawings.
12. Any novel feature or combination of features described herein.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2846631A DE2846631C2 (en) | 1978-10-26 | 1978-10-26 | Sealing ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2034442A true GB2034442A (en) | 1980-06-04 |
| GB2034442B GB2034442B (en) | 1983-03-30 |
Family
ID=6053184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7936610A Expired GB2034442B (en) | 1978-10-26 | 1979-10-22 | Butterfly valve |
Country Status (7)
| Country | Link |
|---|---|
| AT (1) | AT379667B (en) |
| CH (1) | CH647056A5 (en) |
| DE (1) | DE2846631C2 (en) |
| FR (1) | FR2439917A1 (en) |
| GB (1) | GB2034442B (en) |
| IT (1) | IT1124677B (en) |
| SE (1) | SE438723B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4351511A (en) * | 1979-10-11 | 1982-09-28 | Applications Mecanique et Robinetterie Industrielle, A.M.R.I. | Sealing gasket for an obturator such as a ventilation regulator |
| GB2116679A (en) * | 1982-03-12 | 1983-09-28 | Rappold & Co Gmbh Hermann | Shut-off or throttle valve for gaseous media |
| GB2227072A (en) * | 1989-01-10 | 1990-07-18 | Charles Winn | Valves having a turnable closure member such as a butterfly valve |
| JP2013242022A (en) * | 2012-05-22 | 2013-12-05 | Taiho Kogyo Co Ltd | Valve assembly |
| CN103486281A (en) * | 2013-09-23 | 2014-01-01 | 开封瑞科阀门有限公司 | Two-way all-metal hard seal butterfly valve with pre-tightening and floating valve seat |
| CN104896121A (en) * | 2015-05-25 | 2015-09-09 | 蚌埠南自仪表有限公司 | Valve plate and valve body sealing cooperation structure of three-eccentric hard sealing butterfly valve |
| CN108612853A (en) * | 2018-07-16 | 2018-10-02 | 浙江贝尔控制阀门有限公司 | Floating type high-performance butterfly valve |
| CN108895167A (en) * | 2018-07-06 | 2018-11-27 | 添理仕流体控制（上海）有限公司 | A kind of double eccentric butterfly valve |
| CN114635980A (en) * | 2022-01-24 | 2022-06-17 | 良工阀门集团有限公司 | Three-eccentric butterfly valve with automatic compensation sealing function |
| CN115560081A (en) * | 2022-09-30 | 2023-01-03 | 杭州蓝帕流体控制设备有限公司 | Novel butterfly valve with good corrosion resistance effect |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB197000A (en) * | 1922-02-02 | 1923-05-02 | John Beardsell Broadhead | An improvement in or relating to valves |
| DE1147091B (en) * | 1954-03-06 | 1963-04-11 | Pietro Fiorentini | Throttle valve for pressure fluid lines |
| US3260502A (en) * | 1958-04-14 | 1966-07-12 | Parker Hannifin Corp | Butterfly valve |
| GB1051664A (en) * | 1963-03-28 | 1966-12-14 | David F Wiseman & Sons Limited | Improvements relating to butterfly valves |
| DE2315696A1 (en) * | 1973-03-29 | 1974-10-03 | Adams Fa Geb | FLAP VALVE |
| DE2440698A1 (en) * | 1973-08-27 | 1975-03-13 | Juha Antti Elia Nelimarkka | Sealing ring in P.T.F.E. for butterfly valve - with internal ring spring, suitable for high temperature |
| US4037819A (en) * | 1976-03-03 | 1977-07-26 | Kamyr Valves Inc. | Butterfly valve having metal-to-metal sealing with conical angle-transported vane |
-
1978
- 1978-10-26 DE DE2846631A patent/DE2846631C2/en not_active Expired
-
1979
- 1979-09-26 SE SE7907973A patent/SE438723B/en not_active IP Right Cessation
- 1979-10-05 FR FR7924828A patent/FR2439917A1/en active Granted
- 1979-10-11 CH CH916279A patent/CH647056A5/en not_active IP Right Cessation
- 1979-10-16 AT AT0674579A patent/AT379667B/en not_active IP Right Cessation
- 1979-10-22 GB GB7936610A patent/GB2034442B/en not_active Expired
- 1979-10-26 IT IT26832/79A patent/IT1124677B/en active
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4351511A (en) * | 1979-10-11 | 1982-09-28 | Applications Mecanique et Robinetterie Industrielle, A.M.R.I. | Sealing gasket for an obturator such as a ventilation regulator |
| GB2116679A (en) * | 1982-03-12 | 1983-09-28 | Rappold & Co Gmbh Hermann | Shut-off or throttle valve for gaseous media |
| US4527773A (en) * | 1982-03-12 | 1985-07-09 | Hermann Rappold & Co. Gbmh | Shut-off valve with a seal formed from an elastic strip |
| GB2227072A (en) * | 1989-01-10 | 1990-07-18 | Charles Winn | Valves having a turnable closure member such as a butterfly valve |
| US4988076A (en) * | 1989-01-10 | 1991-01-29 | Charles Winn (Valves) Limited | Valves having a turnable closure member such as a butterfly valve |
| GB2227072B (en) * | 1989-01-10 | 1992-12-23 | Charles Winn | Valves having a turnable closure member such as a butterfly valve |
| JP2013242022A (en) * | 2012-05-22 | 2013-12-05 | Taiho Kogyo Co Ltd | Valve assembly |
| CN103486281A (en) * | 2013-09-23 | 2014-01-01 | 开封瑞科阀门有限公司 | Two-way all-metal hard seal butterfly valve with pre-tightening and floating valve seat |
| CN103486281B (en) * | 2013-09-23 | 2016-08-10 | 开封瑞科阀门有限公司 | Pretension, floating valve seat Bidirectional full metal hard seal butterfly valve |
| CN104896121A (en) * | 2015-05-25 | 2015-09-09 | 蚌埠南自仪表有限公司 | Valve plate and valve body sealing cooperation structure of three-eccentric hard sealing butterfly valve |
| CN108895167A (en) * | 2018-07-06 | 2018-11-27 | 添理仕流体控制（上海）有限公司 | A kind of double eccentric butterfly valve |
| CN108612853A (en) * | 2018-07-16 | 2018-10-02 | 浙江贝尔控制阀门有限公司 | Floating type high-performance butterfly valve |
| CN114635980A (en) * | 2022-01-24 | 2022-06-17 | 良工阀门集团有限公司 | Three-eccentric butterfly valve with automatic compensation sealing function |
| CN115560081A (en) * | 2022-09-30 | 2023-01-03 | 杭州蓝帕流体控制设备有限公司 | Novel butterfly valve with good corrosion resistance effect |
Also Published As
| Publication number | Publication date |
|---|---|
| IT7926832A0 (en) | 1979-10-26 |
| SE438723B (en) | 1985-04-29 |
| SE7907973L (en) | 1980-04-27 |
| CH647056A5 (en) | 1984-12-28 |
| DE2846631A1 (en) | 1980-04-30 |
| GB2034442B (en) | 1983-03-30 |
| AT379667B (en) | 1986-02-10 |
| IT1124677B (en) | 1986-05-14 |
| DE2846631C2 (en) | 1983-05-11 |
| FR2439917A1 (en) | 1980-05-23 |
| ATA674579A (en) | 1985-06-15 |
| FR2439917B1 (en) | 1985-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) | ||
| 891 | Reinstatement of application (rule 91(3)/1978) | ||
| PCNP | Patent ceased through non-payment of renewal fee |