CA1076092A - Butterfly valve - Google Patents
Butterfly valveInfo
- Publication number
- CA1076092A CA1076092A CA299,761A CA299761A CA1076092A CA 1076092 A CA1076092 A CA 1076092A CA 299761 A CA299761 A CA 299761A CA 1076092 A CA1076092 A CA 1076092A
- Authority
- CA
- Canada
- Prior art keywords
- sealing portion
- passageway
- radially
- lining
- recess
- 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.)
- Expired
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
- 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
- F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
- F16K1/2265—Shaping or arrangements of the sealing the sealing being arranged on the valve seat with a channel- or U-shaped seal covering a central body portion
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Valve Housings (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Saccharide Compounds (AREA)
- Glass Compositions (AREA)
Abstract
BUTTERFLY VALVE
ABSTRACT OF THE DISCLOSURE
The invention relates to a butterfly valve having a body surrounding a substantially cylindrical passageway and a closure flap which swivels within the passageway. The body is provided with an annular resilient sealing portion against which the periphery of the flap engages in the closed position. The sealing portion sprouts from the base of an annular recess in the inner surface of the body and projects radially inwardly to a position substantially flush with the surface defining the passageway. The sealing portion is also provided on each side with an axially projecting undercut lip which is spaced from the adjacent side of the recess.
ABSTRACT OF THE DISCLOSURE
The invention relates to a butterfly valve having a body surrounding a substantially cylindrical passageway and a closure flap which swivels within the passageway. The body is provided with an annular resilient sealing portion against which the periphery of the flap engages in the closed position. The sealing portion sprouts from the base of an annular recess in the inner surface of the body and projects radially inwardly to a position substantially flush with the surface defining the passageway. The sealing portion is also provided on each side with an axially projecting undercut lip which is spaced from the adjacent side of the recess.
Description
~07609Z
The invention relates to butterfly valves of the usual kind comprising a body surrounding a substantially cylindrical tubular passageway and containing a closure flap which swings between an open position within the passageway and a closed position in which the periphery of the flap seals against the surrounding body.
secure seal between the periphery of the closure flap and the surrounding body is sometimes provided by forming the periphery of the closure flap of resilient material, or lining the inner surface of the body with a resilient lining, or by mounting in the body a resilient seal which projects radially inwardly into the passageway.
The use of an inwardly proJecting seal has the advantages - .
~ that it can be shaped to make a good seal against the closure - 15 flap but the disadvantage that the projecting seal inter-feres with the smooth flow through the passageway when the valve is open. It has been proposed to overcome this latter disadvantage by providing a separate lining substantially flush with the radially inner part of the seal and butting against the projecting seal but this involves the use of - additional parts and can interfere with the seal function.
` In accordance with the present invention, a butterfly valve has a body surrounding a substantially cylindrical passageway and a closure flap which swivels within the passageway, the body being provided with an annular resilient .
..
sealing portion against which the periphery of the flap engages in the closed position, the sealing portion sprouting from the base of an annular recess in the inner surface of the body and projecting radially inwardly to a position substantially flush with the surface defining the passageway, and being provided on each side with an axially projecting undercut lip which is spaced from the adjacent side of the recess.
With this construction the sealing portion does not project significantly into the passageway, although in practice the annular tips o~ the lips may project slightly . ~ ~
into the passageway. However, when the closure flap is in a closed position, a good seal is made against the flap as the fluid pressure on the high pressure side of the flap acts under the lip and urges it towards the closure flap.
- ~ - The radially innermost surface of the sealing portion between the axial extremities of the sealing lips may be slightly recessed so that the lips project radially inwardly as well as axially.
Although the sealing portion may be made of one material, such as rubber, mounted in a recess in a body lining made of material such as cast iron, the sealing portion is preferably formed integrally with a lining which lines the body internally and defines the fluid passageway. At each axial end the lining may have a radially outwardly projecting ,, , ,, . ~ .
, ..
., .
" . : ..
,; :
integral flange which is wrapped around the body to locate the lining in position.
me sealing portion, or integral lining and sealing portion, may be made of a material such as rubber, or a resilient synthetic plastics material such as nitrile rubber, PTFE, or PCTFE. PCTFE is preferred to PTFE for cryogenic applications as it retains its flexibility bet-ter at subambient temperatures.
One example of a butterfly valve constructed in accordance with the present invention is illustrated in the accompanying drawings, in which:-Figure 1 is a side elevation as seen from the left in Figure 2;
`~. Figure 2 is an end elevation with parts in section;
Figure 3 is a section taken on the line III-III in Figure 2 with the valve closed; and, Figure 4 is a section corresponding to part of Figure 3 with the valve open.
The illustrated valve has an annular cylindrical metal body 4 provided on one side with a radially outwardly projecting ~; spindle housing 5. Two webs 6 provided with bolt holes 7 extend between an annular flange 8 at the outer end of the housing 5 and the main part of the body 4.
The body 4 is lined with an annular cylindrica] replaceable lining 9 made of nitrile rubber and provided at its axial ends with integral radially outwardly extending flanges 10 which are , ,, r, : ~
10~609Z
wrapped around the ends of the body 4 and seat in re~esses 11 in the body end walls. Midway along its length the lining 9 is formed with an annular recess 12 from the base of which there sprouts an integral annular sealing portion 13 with two oppositely axially projecting undercut sealing lips 14.
As shown in Figure 4, the radially inwardly facing surfaces of the lips 14 are inclined in a shallow V shape towards one another and are separated by a groove 15.
The valve has a circular closure flap 16 which is , 10 fixed by two screws 17 on a spindle 18 which is rotatably ; - mounted in PFTE coated brass bearings 19 in the spindle housing 5 and in the diametrically opposite portion 20 of the body 4.
m e lining 9 closely surrounds the spindle where it passes 1- through the lining to seal the spindle to the body. The spindle 18 is fixed ~o an operating handle 21, although it may be rotated mechanically in other applications, such that rotation of the handle 21 through 90 rotates the spindle 18 and the closure - flap 16 between the fully closed position shown in Figure 3 and a fully open position. me position of the closure flap at any ~ime is indicated by a pointer 22 which is fixed to the handle 21 and is aligned with a mark C on a plate 2~ fixed to the flange 8 in the fully closed position, and with a mark 0 in the fully open position. me handle may be located in one of a number of selected positions by a wing head screw 24 which screws through a portion 25 of the handle 21 and engages in a selected one of ' a number of recesses in a rack portion 26 on the flange 8.
.. ... .
i; . j. , - . . . . .
,Ç : ~ :
, , - = -- : ---~
-`-` 107609Z
.
In use the flap is used as a wafer valve and the body 4 is sandwiched between adjacent conduit modules which are drawn up together by a ring of bolts which extend radially outwardly of the body 4 between the adjacen-t modules, two of the bolts passing through the holes 7 in the webs 6. A seal is made between each end of the valve and the adjacent conduit module.by compression of the respective flange 10 of the . lining 9. During this compression some of the resilient material from which the lining is made will be forced into a pair of ~ 10 machined grooves 27 in the bottom of the respective recess 11 to assist in keying the lining in position. The inner cylindrical peripheral surface of the lining 9 will be aligned with the ~ fluid passageway through the adjacent conduit modules.
: Since the valve is symmetrical, it can be used equally ~ 15 efficiently irrespective of the direction of flow through the ;~ valve. When the valve is closed as shown in Figure 3, the ed~e of the flap 16 seals against both the lips 14 of the sealing portion 13, the sealing engagement being enhanced by the fluid pressure on the high pressure side acting on the under-cut of a respective one of the lips 14 thereby urging the lip more firmly into engagement with the periphery of the flap 16.
When the. valve is opened, the sealing portion 1~ adopts the configuration shown in Figure 4 in which the extreme tips of the lips 14 are substantially in alignment with the inner cylindrical peripheral surface of the lining 9 so as not to - provide any significant obstruction to fluid flow through the valve.
,.., -- - 6 - :
~"~ , ..
., .
The invention relates to butterfly valves of the usual kind comprising a body surrounding a substantially cylindrical tubular passageway and containing a closure flap which swings between an open position within the passageway and a closed position in which the periphery of the flap seals against the surrounding body.
secure seal between the periphery of the closure flap and the surrounding body is sometimes provided by forming the periphery of the closure flap of resilient material, or lining the inner surface of the body with a resilient lining, or by mounting in the body a resilient seal which projects radially inwardly into the passageway.
The use of an inwardly proJecting seal has the advantages - .
~ that it can be shaped to make a good seal against the closure - 15 flap but the disadvantage that the projecting seal inter-feres with the smooth flow through the passageway when the valve is open. It has been proposed to overcome this latter disadvantage by providing a separate lining substantially flush with the radially inner part of the seal and butting against the projecting seal but this involves the use of - additional parts and can interfere with the seal function.
` In accordance with the present invention, a butterfly valve has a body surrounding a substantially cylindrical passageway and a closure flap which swivels within the passageway, the body being provided with an annular resilient .
..
sealing portion against which the periphery of the flap engages in the closed position, the sealing portion sprouting from the base of an annular recess in the inner surface of the body and projecting radially inwardly to a position substantially flush with the surface defining the passageway, and being provided on each side with an axially projecting undercut lip which is spaced from the adjacent side of the recess.
With this construction the sealing portion does not project significantly into the passageway, although in practice the annular tips o~ the lips may project slightly . ~ ~
into the passageway. However, when the closure flap is in a closed position, a good seal is made against the flap as the fluid pressure on the high pressure side of the flap acts under the lip and urges it towards the closure flap.
- ~ - The radially innermost surface of the sealing portion between the axial extremities of the sealing lips may be slightly recessed so that the lips project radially inwardly as well as axially.
Although the sealing portion may be made of one material, such as rubber, mounted in a recess in a body lining made of material such as cast iron, the sealing portion is preferably formed integrally with a lining which lines the body internally and defines the fluid passageway. At each axial end the lining may have a radially outwardly projecting ,, , ,, . ~ .
, ..
., .
" . : ..
,; :
integral flange which is wrapped around the body to locate the lining in position.
me sealing portion, or integral lining and sealing portion, may be made of a material such as rubber, or a resilient synthetic plastics material such as nitrile rubber, PTFE, or PCTFE. PCTFE is preferred to PTFE for cryogenic applications as it retains its flexibility bet-ter at subambient temperatures.
One example of a butterfly valve constructed in accordance with the present invention is illustrated in the accompanying drawings, in which:-Figure 1 is a side elevation as seen from the left in Figure 2;
`~. Figure 2 is an end elevation with parts in section;
Figure 3 is a section taken on the line III-III in Figure 2 with the valve closed; and, Figure 4 is a section corresponding to part of Figure 3 with the valve open.
The illustrated valve has an annular cylindrical metal body 4 provided on one side with a radially outwardly projecting ~; spindle housing 5. Two webs 6 provided with bolt holes 7 extend between an annular flange 8 at the outer end of the housing 5 and the main part of the body 4.
The body 4 is lined with an annular cylindrica] replaceable lining 9 made of nitrile rubber and provided at its axial ends with integral radially outwardly extending flanges 10 which are , ,, r, : ~
10~609Z
wrapped around the ends of the body 4 and seat in re~esses 11 in the body end walls. Midway along its length the lining 9 is formed with an annular recess 12 from the base of which there sprouts an integral annular sealing portion 13 with two oppositely axially projecting undercut sealing lips 14.
As shown in Figure 4, the radially inwardly facing surfaces of the lips 14 are inclined in a shallow V shape towards one another and are separated by a groove 15.
The valve has a circular closure flap 16 which is , 10 fixed by two screws 17 on a spindle 18 which is rotatably ; - mounted in PFTE coated brass bearings 19 in the spindle housing 5 and in the diametrically opposite portion 20 of the body 4.
m e lining 9 closely surrounds the spindle where it passes 1- through the lining to seal the spindle to the body. The spindle 18 is fixed ~o an operating handle 21, although it may be rotated mechanically in other applications, such that rotation of the handle 21 through 90 rotates the spindle 18 and the closure - flap 16 between the fully closed position shown in Figure 3 and a fully open position. me position of the closure flap at any ~ime is indicated by a pointer 22 which is fixed to the handle 21 and is aligned with a mark C on a plate 2~ fixed to the flange 8 in the fully closed position, and with a mark 0 in the fully open position. me handle may be located in one of a number of selected positions by a wing head screw 24 which screws through a portion 25 of the handle 21 and engages in a selected one of ' a number of recesses in a rack portion 26 on the flange 8.
.. ... .
i; . j. , - . . . . .
,Ç : ~ :
, , - = -- : ---~
-`-` 107609Z
.
In use the flap is used as a wafer valve and the body 4 is sandwiched between adjacent conduit modules which are drawn up together by a ring of bolts which extend radially outwardly of the body 4 between the adjacen-t modules, two of the bolts passing through the holes 7 in the webs 6. A seal is made between each end of the valve and the adjacent conduit module.by compression of the respective flange 10 of the . lining 9. During this compression some of the resilient material from which the lining is made will be forced into a pair of ~ 10 machined grooves 27 in the bottom of the respective recess 11 to assist in keying the lining in position. The inner cylindrical peripheral surface of the lining 9 will be aligned with the ~ fluid passageway through the adjacent conduit modules.
: Since the valve is symmetrical, it can be used equally ~ 15 efficiently irrespective of the direction of flow through the ;~ valve. When the valve is closed as shown in Figure 3, the ed~e of the flap 16 seals against both the lips 14 of the sealing portion 13, the sealing engagement being enhanced by the fluid pressure on the high pressure side acting on the under-cut of a respective one of the lips 14 thereby urging the lip more firmly into engagement with the periphery of the flap 16.
When the. valve is opened, the sealing portion 1~ adopts the configuration shown in Figure 4 in which the extreme tips of the lips 14 are substantially in alignment with the inner cylindrical peripheral surface of the lining 9 so as not to - provide any significant obstruction to fluid flow through the valve.
,.., -- - 6 - :
~"~ , ..
., .
Claims (9)
1. A butterfly valve having a body surrounding a sub-stantially cylindrical passageway and a closure flap which swivels within the said passageway between open and closed positions, said body being provided with an annular resilient sealing portion against which the periphery of said flap engages in said closed position, said sealing portion sprouting from the base of an annular recess in the inner surface of said body and projecting radially inwardly to a position substantially flush with said surface defining said passageway, and being provided on each side with an axially projecting undercut lip spaced from the adjacent side of said recess.
2. A valve according to claim 1, wherein a radially inner-most surface of said sealing portion between axial extremities of said sealing lips is slightly recessed whereby said lips project radially inwardly as well as axially.
3. A valve according to claim 1, wherein said sealing portion is formed integrally with a lining which lines said body internally and defines said fluid passageway.
4. A valve according to claim 3, wherein, at each axial end, said lining has a radially outwardly projecting integral flange wrapped around said body to locate said lining in position.
5. A butterfly valve having a body surrounding a substantially cylindrical passageway and a closure flap which swivels within the said passageway between open and closed positions, said body having a resilient lining which lines said body internally and defines said fluid passageway and is provided with an integral, annular, sealing portion against which the periphery of said flap engages in said closed position, said sealing portion sprouting from the base of an annular recess in the inner surface of said lining and projecting radially inwardly to a position substantially flush with said surface defining said passageway, each axially facing side of said sealing portion being spaced from an adjacent side of said recess to define a radially extending groove having a narrow, radially inner portion opening into said passageway and a wider, radially outer portion with a cross-section bounded by a curvilinear periphery, said sealing portion being provided on each side with an axially projecting lip spaced from the adja-cent side of said recess, each of said lips being undercut by said wider portion of a respective one of said grooves.
6. A valve according to claim 5, wherein a radially innermost surface of said sealing portion between axial extremities of said sealing lips is slightly recessed whereby said lips project radially inwardly as well as axially.
7. A valve according to claim 5 or claim 6, wherein, at each axial end, said lining has a radially outwardly projecting integral flange wrapped around said body to locate said lining in position.
8. A valve according to claim 5, wherein said curvilinear periphery of said outer portion of said groove is substantially part circular.
9. A valve according to claim 8, wherein said radially inner portion of said groove is defined by a radially extending part of said side of said recess and an adjacent radially extending part of said sealing portion, said radially extending part of said side of said recess merging tangentially into the said substantially part circular part of said sealing portion to define said radially outer portion of said groove.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB13882/77A GB1576020A (en) | 1977-04-01 | 1977-04-01 | Butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1076092A true CA1076092A (en) | 1980-04-22 |
Family
ID=10031072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA299,761A Expired CA1076092A (en) | 1977-04-01 | 1978-03-28 | Butterfly valve |
Country Status (16)
| Country | Link |
|---|---|
| JP (1) | JPS53122936A (en) |
| AU (1) | AU3465978A (en) |
| BE (1) | BE865494A (en) |
| BR (1) | BR7801942A (en) |
| CA (1) | CA1076092A (en) |
| DE (1) | DE2813135A1 (en) |
| DK (1) | DK144878A (en) |
| ES (1) | ES468373A1 (en) |
| FR (1) | FR2385959A1 (en) |
| GB (1) | GB1576020A (en) |
| IT (1) | IT7867713A0 (en) |
| LU (1) | LU79348A1 (en) |
| NL (1) | NL7803429A (en) |
| NO (1) | NO780919L (en) |
| SE (1) | SE7803597L (en) |
| ZA (1) | ZA781452B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2821091C2 (en) * | 1978-05-13 | 1986-11-13 | Josef 6200 Wiesbaden Nemetz | Butterfly valve |
| JPS5637758U (en) * | 1979-08-31 | 1981-04-10 | ||
| WO1984004794A1 (en) * | 1983-05-31 | 1984-12-06 | Richards & Co B C | A valve seal suitable for cryogenic service |
| CN111173621A (en) * | 2020-01-17 | 2020-05-19 | 杰锋汽车动力系统股份有限公司 | New energy automobile electron air throttle structure |
-
1977
- 1977-04-01 GB GB13882/77A patent/GB1576020A/en not_active Expired
-
1978
- 1978-03-13 ZA ZA00781452A patent/ZA781452B/en unknown
- 1978-03-15 NO NO780919A patent/NO780919L/en unknown
- 1978-03-25 DE DE19782813135 patent/DE2813135A1/en not_active Withdrawn
- 1978-03-28 CA CA299,761A patent/CA1076092A/en not_active Expired
- 1978-03-30 BE BE186405A patent/BE865494A/en unknown
- 1978-03-30 SE SE7803597A patent/SE7803597L/en unknown
- 1978-03-30 BR BR7801942A patent/BR7801942A/en unknown
- 1978-03-30 ES ES468373A patent/ES468373A1/en not_active Expired
- 1978-03-31 FR FR7809648A patent/FR2385959A1/en active Granted
- 1978-03-31 LU LU79348A patent/LU79348A1/en unknown
- 1978-03-31 JP JP3690878A patent/JPS53122936A/en active Pending
- 1978-03-31 AU AU34659/78A patent/AU3465978A/en active Pending
- 1978-03-31 NL NL7803429A patent/NL7803429A/en not_active Application Discontinuation
- 1978-03-31 DK DK144878A patent/DK144878A/en not_active IP Right Cessation
- 1978-03-31 IT IT7867713A patent/IT7867713A0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE865494A (en) | 1978-07-17 |
| LU79348A1 (en) | 1978-07-13 |
| NL7803429A (en) | 1978-10-03 |
| SE7803597L (en) | 1978-10-02 |
| ZA781452B (en) | 1979-04-25 |
| GB1576020A (en) | 1980-10-01 |
| AU3465978A (en) | 1979-10-04 |
| FR2385959A1 (en) | 1978-10-27 |
| FR2385959B3 (en) | 1980-12-19 |
| DK144878A (en) | 1978-10-02 |
| DE2813135A1 (en) | 1978-10-12 |
| NO780919L (en) | 1978-10-03 |
| BR7801942A (en) | 1978-11-21 |
| JPS53122936A (en) | 1978-10-26 |
| IT7867713A0 (en) | 1978-03-31 |
| ES468373A1 (en) | 1978-12-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |