CN101319724A - Back pressure type bidirectional bearing hard seal butterfly valve - Google Patents
Back pressure type bidirectional bearing hard seal butterfly valve Download PDFInfo
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- CN101319724A CN101319724A CNA2008101324233A CN200810132423A CN101319724A CN 101319724 A CN101319724 A CN 101319724A CN A2008101324233 A CNA2008101324233 A CN A2008101324233A CN 200810132423 A CN200810132423 A CN 200810132423A CN 101319724 A CN101319724 A CN 101319724A
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- valve body
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- butterfly
- butterfly plate
- back pressure
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- 230000002457 bidirectional effect Effects 0.000 title claims description 15
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 235000014121 butter Nutrition 0.000 abstract 1
- 210000003733 optic disk Anatomy 0.000 abstract 1
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The invention discloses a back-pressure two-way bearing hard-sealing butterfly valve, comprising an existing triple eccentric butterfly valve which has a valve body; an inlet and an outlet are arranged on the valve body; a valve rod is arranged in the valve body; the part of the valve rod outside the valve body is connected to a drive mechanism, and a butterfly plate is fixed on the part of the valve rod inside the valve body. A back-pressure sealing mechanism is arranged on the valve body adjacent to the outer margin of the butterfly plate; the back-pressure sealing mechanism comprises an elastic sealing ring which is arranged on the valve body at the outer margin of the butterfly plate; the back-pressure sealing mechanism also comprises a fastening mechanism which is fixed on the valve body and pressed on the elastic sealing ring, as that the elastic sealing ring is fixedly pressed on the valve body and seals the gap between the butterfly plate and the valve body. The invention ensures the sealing action in both positive direction and negative position, overcomes the theoretical sealing blindspot of butter valves, and achieves two-direction omni seal and zero leakage. The invention is capable of meeting the requirement of two-direction bearing and zero leakage under high-temperature working condition.
Description
Technical field
The present invention relates to a kind of butterfly valve, especially a kind of back pressure type bidirectional bearing hard seal butterfly valve that is used for high temperature media transfer line bidirectional bearing and zero leakage requirement operating mode.
Background technique
The development of butterfly valve is very fast, at present, in every profession and trade, especially on the heavy-caliber pipeline, the trend that replaces internal valve is arranged, and uses more and more widely.But it is higher to work as medium temperature, and needs under the operating mode of its positive and negative pressure-bearing and zero leakage, and common butterfly valve is just inapplicable.Butterfly valve with three eccentric structures of the prior art, its structure characteristic is valve rod axis deviation butterfly plate center therein, also depart from the basis of two eccentric valve rod shaft core position off-centre at body center, the cone type axis deviation that makes the butterfly plate sealing surface is in the body cylinder axis.The sealing section of butterfly plate no longer is that proper circle but ellipse, its sealing surface shape are also therefore asymmetric, favouring body center line, another side then is parallel to the body center line on one side.It is pressed according to the surface of contact of valve seat fully and reaches sealing effect.This three eccentric structure butterfly valves are that high temperature that be directly proportional, high pressure resistant also is readily solved having solved this difficult problem of metal seat valve zero leakage aspect the forward pressure-bearing and having pressed with pressure medium because of surface of contact.But it has the operating mode of zero leakage requirement for needing bidirectional bearing, and this butterfly valve still is unsafty at the sealing effect of direction.Be that mainly its sealability is not good when the opposite direction pressure-bearing.
Summary of the invention
The objective of the invention is to improve the deficiencies in the prior art, a kind of back pressure type bidirectional bearing hard seal butterfly valve that can satisfy bidirectional bearing under the worst hot case and zero leakage requirement fully is provided.
The object of the present invention is achieved like this:
A kind of back pressure type bidirectional bearing hard seal butterfly valve, it comprises existing three eccentric structure butterfly valves, has valve body, establish import and outlet on the valve body, valve rod is installed in the valve body, is connected driving mechanism on the part that is positioned at valve body outside of valve rod, fixing butterfly plate on the part that is positioned at valve inner of valve rod; It is characterized in that: on the valve body adjacent, be provided with a back pressure sealing mechanism with the butterfly plate outer rim, it comprises an elastic seal ring, place the outer rim that is positioned at butterfly plate on the valve body, also comprise a fixed mechanism, it is fixed on the valve body and is pressed on this elastic seal ring, makes this elastic seal ring press solidly and is sealing on the valve body and with the gap between described butterfly plate and the valve body.
Described back pressure mechanism mainly includes spring, the spring cushion block, seal ring, screw and end flange, on the inwall of outlet one end of described valve body is shoulder hole, on the step flange of its formation, seal ring is set, the inwall of sealing circle contacts with the outer rim of the butterfly plate that is in closed condition, on the sealing circle, set firmly the spring cushion block, the ladder orifice shapes coupling of the outlet port of this valve body be provided with described end flange, be installed with described spring on the inward end surface of this end flange, this end flange by screw on described valve body, to apply a back pressure, make seal ring to be pressed on the valve body the clearance seal between valve body and the butterfly plate by spring.
Butterfly valve provided by the invention, when reverse pressure-bearing, seal pressure compresses butterfly plate by spring promotion composite sealing ring and the sealing force of butterfly plate between seal ring forms required seal pressure, thereby reaches reverse seal action; The forward sealing is that normal three eccentric structures form.This has just guaranteed the seal action of butterfly valve on positive and negative both direction, has overcome the theoretic sealing blind spot of butterfly valve, reaches two-way full-seal zero-leakage.
In addition, described valve rod is a two-part, and two sections valve rods and described butterfly plate are connected, and its fixing mechanism can be: respectively be provided with the key linkage structure on two sections valve rods, make described two sections valve rods and butterfly plate be linked together by this pair key.The valve rod of this structure can also make that the manufacturing of butterfly plate and assembling are simple more, convenient except can saving material, reducing cost.
Back pressure type hard seal butterfly valve provided by the invention, when the butterfly valve reverse pressure-bearing, seal pressure compresses butterfly plate by spring promotion composite sealing ring and the sealing force of butterfly plate between seal ring forms required seal pressure, thereby reaches reverse seal action; The forward sealing is that normal three eccentric structures form.This has just guaranteed the seal action of butterfly valve on positive and negative both direction, has overcome the theoretic sealing blind spot of butterfly valve, reaches two-way full-seal zero-leakage.It can satisfy under the worst hot case, the requirement of bidirectional bearing zero leakage.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of back pressure type bidirectional bearing hard seal butterfly valve provided by the invention.
Embodiment
As shown in Figure 1, back pressure type bidirectional bearing hard seal butterfly valve provided by the invention, it comprises existing three eccentric structure butterfly valves, has valve body 5, establish import and outlet on the valve body 5, valve rod is installed in the valve body, and it comprises that an end is arranged on upper valve rod 13 and the lower valve rod 4 on the valve body 5 rotationally, and upper valve rod 13 connects driving mechanism, for example, can be to connect worm gear 21 by flat key 20 on the part that is positioned at the valve body outside of upper valve rod, worm gear 21 and worm meshing set firmly handwheel on worm screw.Worm-and-wheel gear is fixed on the support 19 by bolt 23, nut 22.Be provided with stuffing seal between upper valve rod 13 and the valve body, it is specially: valve body is provided with stuffing box, and therein and be provided with filler 14 between the upper valve rod, Gland 15 is fixed on the stuffing box by stud bolt 16, plain washer 17 and nut 18.Valve body 5 is connected with support 19 by stud bolt 25, nut 24.The part that is positioned at valve body 5 inside of upper valve rod 13 and lower valve rod 4 is respectively equipped with flat key structure 11, with the keyway coupling on the butterfly plate 12, and makes butterfly plate 12 be fixed on the lower valve rod.
On the valve body 5 adjacent, be provided with a back pressure sealing mechanism with butterfly plate 12 outer rims, it comprises an elastic seal ring 10, place the outer rim that is positioned at butterfly plate 12 on the valve body, also comprise a fixed mechanism, it is fixed on the valve body 5 and is pressed on this elastic seal ring 10, makes this elastic seal ring 10 press solidly and is sealing on the valve body 5 and with the gap between butterfly plate 12 and the valve body 5.Concrete structure is: be the ladder hole wall on the inwall of outlet one end of valve body 5, aperture, the outside is bigger, seal ring 10 is set on the step flange of its formation, the inwall of sealing circle 10 contacts with the outer rim of the butterfly plate that is in closed condition, on seal ring 10, set firmly spring cushion block 9, the ladder orifice shapes coupling of the outlet port of this valve body 5 be provided with an end flange 7, establish groove on the inward end surface of this end flange 7, establish spring 8 in this groove, this end flange 7 is fixed on the valve body 5 by socket head screw 6, spring 8 is pressed against on the seal block 9, apply a back pressure thus, make seal ring 10 to be pressed on the valve body 5 clearance seal between valve body 5 and the butterfly plate 12 by spring 8.
Can also be on valve body 5 by the nameplate 26 of rivet 27 these valves of riveted fixing.
Claims (4)
1. back pressure type bidirectional bearing hard seal butterfly valve, it comprises existing three eccentric structure butterfly valves, has valve body, establish import and outlet on the valve body, valve rod is installed in the valve body, is connected driving mechanism on the part that is positioned at valve body outside of valve rod, fixing butterfly plate on the part that is positioned at valve inner of valve rod; It is characterized in that: on the described valve body adjacent, be provided with a back pressure sealing mechanism with described butterfly plate outer rim, it comprises an elastic seal ring, place the outer rim that is positioned at butterfly plate on the valve body, also comprise a fixed mechanism, it is fixed on the valve body and is pressed on this elastic seal ring, makes this elastic seal ring press solidly and is sealing on the valve body and with the gap between described butterfly plate and the valve body.
2. back pressure type bidirectional bearing hard seal butterfly valve according to claim 1, it is characterized in that: described back pressure mechanism includes spring, the spring cushion block, seal ring, screw and end flange, on the inwall of outlet one end of described valve body is the ladder hole wall, the sealing circle is set on the step flange of its formation, the inwall of sealing circle contacts with the outer rim of this butterfly plate that is in closed condition, on the sealing circle, set firmly the spring cushion block, the ladder orifice shapes coupling of the outlet port of this valve body be provided with described end flange, be installed with described spring on the inward end surface of this end flange, this end flange by screw on described valve body.
3. back pressure type bidirectional bearing hard seal butterfly valve according to claim 1 and 2 is characterized in that: described valve rod is a two-part, and two sections valve rods and described butterfly plate are connected.
4. back pressure type bidirectional bearing hard seal butterfly valve according to claim 3, it is characterized in that: the fixing mechanism of described valve rod and butterfly plate is: respectively be provided with the key linkage structure on two sections described valve rods, make described two sections valve rods and butterfly plate be linked together by this pair key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101324233A CN101319724A (en) | 2008-07-16 | 2008-07-16 | Back pressure type bidirectional bearing hard seal butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101324233A CN101319724A (en) | 2008-07-16 | 2008-07-16 | Back pressure type bidirectional bearing hard seal butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101319724A true CN101319724A (en) | 2008-12-10 |
Family
ID=40179925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101324233A Pending CN101319724A (en) | 2008-07-16 | 2008-07-16 | Back pressure type bidirectional bearing hard seal butterfly valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101319724A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527796A (en) * | 2013-10-29 | 2014-01-22 | 华东阀门有限公司 | Bidirectional pressure-bearing hard seal butterfly valve |
| CN111022663A (en) * | 2020-01-13 | 2020-04-17 | 秦亚州 | Central line butterfly valve of three eccentric metal hard sealing rubber lining based on petroleum transportation |
| CN115013546A (en) * | 2022-07-14 | 2022-09-06 | 良工阀门集团有限公司 | Two-way seal structure and butterfly valve |
-
2008
- 2008-07-16 CN CNA2008101324233A patent/CN101319724A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527796A (en) * | 2013-10-29 | 2014-01-22 | 华东阀门有限公司 | Bidirectional pressure-bearing hard seal butterfly valve |
| CN111022663A (en) * | 2020-01-13 | 2020-04-17 | 秦亚州 | Central line butterfly valve of three eccentric metal hard sealing rubber lining based on petroleum transportation |
| CN111022663B (en) * | 2020-01-13 | 2021-09-03 | 江苏进典控制阀有限公司 | Central line butterfly valve of three eccentric metal hard sealing rubber lining based on petroleum transportation |
| CN115013546A (en) * | 2022-07-14 | 2022-09-06 | 良工阀门集团有限公司 | Two-way seal structure and butterfly valve |
| CN115013546B (en) * | 2022-07-14 | 2023-03-14 | 良工阀门集团有限公司 | Two-way seal structure and butterfly valve |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20081210 |