CN202955245U - Small-aperture triple eccentric butterfly valve - Google Patents
Small-aperture triple eccentric butterfly valve Download PDFInfo
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- CN202955245U CN202955245U CN 201220625240 CN201220625240U CN202955245U CN 202955245 U CN202955245 U CN 202955245U CN 201220625240 CN201220625240 CN 201220625240 CN 201220625240 U CN201220625240 U CN 201220625240U CN 202955245 U CN202955245 U CN 202955245U
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- seal ring
- valve
- valve body
- small
- eccentric butterfly
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Abstract
The utility model discloses a small-aperture triple eccentric butterfly valve and the purposes of the small-aperture triple eccentric butterfly valve. The small-aperture triple eccentric butterfly valve comprises a valve body, wherein a valve plate is arranged on the valve body. The valve plate is connected with a valve rod, a seal ring is arranged on a contacting face between the valve body and the valve plate, a pressing plate is fixed on the valve body, a groove is formed between the valve body and the pressing plate, and one side, close to the valve body, of the seal ring is arranged inside the groove. A reinforcing compound graphite gasket is arranged between the seal ring and the pressing plate. A reinforcing compound graphite gasket is arranged between the seal ring and the valve body. By the adoption of the structure, the facts that the seal ring not only cannot swing inside the groove freely, but also can expand freely when working in high-temperature working conditions are guaranteed. Therefore, sealing faces of the seal ring and the valve plate are guaranteed to be uniform in expansion in thermal state working conditions, and the valve is guaranteed to have good sealing performance in the high-temperature working conditions.
Description
Technical field
The utility model relates to a kind of valve, particularly a kind of small-bore three eccentric butterfly valve.
Background technique
Some key positions at oil-refining chemical industry device pipeline, because the leakage class in the adjusting function to valve, quick closedown time and while closing all has strict requirement, therefore, the characteristics that three eccentric butterfly valve is good because of its modulability, the shut-in time is short and can realize zero leakage, be widely used.
When three eccentric butterfly valve works in temperature and surpasses the operating mode of 450 ℃, due to thermal distortion and seal ring and the valve plate inconsistent reason that expands, cause its sealability when worst hot case to reduce or total failure, reduced the working efficiency of whole device and even brought potential safety hazard.Therefore, solve three eccentric butterfly valve and become in the synchronous expansion issues of worst hot case lower valve plate and seal ring the key that can three eccentric butterfly valve normally move.For heavy caliber three eccentric butterfly valve (DN>600), generally by the design binocular structure, offset valve plate and the inconsistent impact brought of the hot expansion of seal ring.
In realizing process of the present utility model, the inventor finds that at least there is following problem in prior art: for small-bore three eccentric butterfly valve (DN≤600), due to its bore and the restriction of opening grade size, make binocular structure can't obtain enough design spaces, therefore use said method can't realize that small-bore three eccentric butterfly valve has good sealability under worst hot case.
The model utility content
In order to solve the problem of prior art, the utility model embodiment provides a kind of small-bore three eccentric butterfly valve that has good sealability under worst hot case.
The technological scheme that the utility model is taked to achieve these goals is:
A kind of small-bore three eccentric butterfly valve, comprise valve body, described valve body is provided with valve plate, described valve plate is connected with valve rod, and the surface of contact of described valve body and valve plate is provided with seal ring, on described valve body, is fixed with pressing plate, form groove between described valve body and pressing plate, described seal ring is arranged in described groove in the side near valve body, between the collar wall of described seal ring and the inwall of described groove, is provided with clearance for expansion, and described clearance for expansion can make described seal ring not retrained by groove when hot expansion.
Be provided with between described seal ring and described pressing plate and strengthen the composite graphite pad.
Be provided with between described seal ring and described valve body and strengthen the composite graphite pad.
Be provided with guide finger in described groove, described guide finger is fixed on described valve body, and described seal ring is set on described guide finger.
Described seal ring is provided with the first guiding groove, described reinforcement composite graphite pad is provided with the second guiding groove, described the first guiding groove and the second guiding groove are positioned on same axis, described guide finger one end is arranged in the first guiding groove and the second guiding groove, and the described guide finger the other end is fixed on described valve body.
Described pressing plate is fixed on described valve body by hold-down bolt; Described pressing plate function just plays the precompressed effect to the active force on seal ring to seal ring, makes seal ring can not produce and rock or displacement, when worst hot case, can not produce constraint to the expansion of seal ring again.
Described valve rod is latus rectum axis structure, in the side that actuator is not installed, is provided with gap.
Described valve plate has cemented carbide with the sealing surface weld deposit that described seal ring contacts.
The beneficial effect that the technological scheme that the utility model embodiment provides is brought is:
Adopt structure of the present utility model to guarantee that seal ring neither can arbitrarily rock in groove, again can free expansion when worst hot case is worked.It is consistent that thereby the sealing surface that guarantees seal ring and valve plate expands in hot operating mode, guarantees that valve has good sealability under worst hot case.
The accompanying drawing explanation
In order to be illustrated more clearly in the technological scheme in the utility model embodiment, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the small-bore three eccentric butterfly valve radial cross-section that the utility model embodiment provides;
Fig. 2 is the I place enlarged view of Fig. 1;
Fig. 3 is the axial sectional view of small-bore three eccentric butterfly valve that the utility model embodiment provides;
Fig. 4 is the structural representation of the seal ring that provides of the utility model embodiment;
Fig. 5 is the side sectional view of Fig. 4;
Fig. 6 is the structural representation of the reinforcement composite graphite pad that provides of the utility model embodiment.
In figure: 1 valve plate, 2 strengthen composite graphite pad, 3 guide fingers, 4 seal rings, 5 hold-down bolts, 6 pressing plates, 7 valve bodies, 8 valve rods, 9 grooves, 10 actuators, 11 first guiding grooves, 12 second guiding grooves.
Embodiment
For making the purpose of this utility model, technological scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model mode of execution is described in further detail.
Referring to Fig. 1 and Fig. 2, a kind of small-bore three eccentric butterfly valve, comprise valve body 7, valve body 7 is provided with valve plate 1, valve plate 1 is connected with valve rod 8, and valve body 7 is provided with seal ring 4 with the surface of contact of valve plate 1, is fixed with pressing plate 6 on valve body 7, form groove 9 between valve body 7 and pressing plate 6, seal ring 4 is arranged in groove 9 in the side near valve body 7.Be provided with clearance for expansion between the inwall of the collar wall of seal ring 4 and groove 9, described clearance for expansion can make described seal ring not retrained by groove when hot expansion.
Seal ring of the present utility model, as encapsulation fitting, has convertibility, when sealing surface wear, is convenient for changing seal ring.Pressing plate and valve body are the wafer type structure, pressing plate is set, is equivalent to thicken valve body, the synchronous expansion compensation design of seal ring is placed in valve body, thereby well guaranteed the sealing surface opening area of valve, made the sealing surface opening area of valve easily meet the relevant design requirement; The sealing surface of seal ring and valve plate expands consistent in hot operating mode, guarantee that valve has good sealability under worst hot case.
The present embodiment is on the basis of above-described embodiment, is provided with between seal ring 4 and pressing plate 6 and strengthens composite graphite pad 2.Be provided with between seal ring 4 and valve body 7 and strengthen composite graphite pad 2.Strengthen composite graphite pad 2 and be preferably metal reinforcement composite graphite pad.
Wherein, strengthen the composite graphite pad, strengthening material is metal or pottery, adopts metal or pottery as skeletal structure, it is characterized by and can form space shape structure, be packed into graphite in gap, its skeletal structure can guarantee the intensity of pad, and the graphite of filling can precipitate into gasket surface when worst hot case, forms the graphite sliding layer between pad and seal ring, can reduce the surface friction drag between metal and metal, be beneficial to the hot expansion of seal ring.
Reinforcement composite graphite pad of the present utility model can be selected Ai Zhi industrial technology group, its specification is that the AIG39D metal strengthens Graphite pad, and thickness is 2mm, and the metal base material is 304SS, can whole buy back and be processed into voluntarily needed size, but also consigned processing to finished size.Also can select the metal that the said firm's specification is AIG OEM139 series to strengthen the graphite sheet pad.
Be designed with in the seal ring both sides and strengthen the composite graphite pad, the suitable clearance for expansion value of design in groove, after valve heats up, seal ring 4 is along the radial expansion of groove, and the reinforcement composite graphite pad 2 of both sides precipitate into surperficial graphite can play the lubricated effect that reduces mill sassafras power.
The present embodiment is on the basis of above-described embodiment, is provided with guide finger 3 in groove 9, and guide finger 3 is fixed on valve body 7, and guide finger 3 is set on seal ring 4.
Referring to Fig. 2, Fig. 4, Fig. 5 and Fig. 6, seal ring 4 is provided with the first guiding groove 11, strengthen composite graphite pad 2 and be provided with the second guiding groove 12, the first guiding groove 11 and the second guiding groove 12 are positioned on same axis, two guiding grooves are connected, guide finger 3 one ends are arranged in the first guiding groove 11 and the second guiding groove 12, and guide finger 3 the other ends are fixed on valve body 7.When hot expansion, guide finger 3 can make seal ring 4 expand along guide finger 3 directions, thereby guarantees the expansion conformity of pressurization surface.Guiding groove is preferably the circular arc bar shaped.
Direction when guide finger being set guaranteeing that seal ring expands, make seal ring along radial expansion, and can not rotate, thereby have influence on sealing effect, because the inner ring of seal ring be oval, inner ring is combined with valve plate, and outer ring is circle, and outer ring is arranged in groove.If rotate, sealing effect is poor.
Referring to Fig. 3, as preferably, pressing plate 6 is fixed on valve body 7 by hold-down bolt 5.But pressing plate function just plays the precompressed effect to the active force on seal ring to seal ring, make seal ring can not produce and rock or displacement, can not produce constraint to the expansion of seal ring again when worst hot case.
The present embodiment is on the basis of above-described embodiment, and valve plate 7 has cemented carbide with the sealing surface weld deposit that seal ring 4 contacts.
Valve plate can be monolithic construction, the slightly high cemented carbide in the sealing surface weld deposit hardness of valve plate, can select D802, D812, D507 etc. according to the difference of temperature, can guarantee that sealing surface is not contained the media damage of abrasion particle, the sealing surface of seal ring that also can be slightly not low by hardness damages.
Referring to Fig. 3, in order to prevent the impact of valve rod 8 on valve plate 1 when hot expand, valve rod 8 is designed to without constraint type,, when valve rod 8 expands with valve plate 1, whole valve rod 8 directions produce the design retrained to expanding; One side is reserved certain clearance for expansion value b by calculating, and opposite side and actuator's connecting end also require actuator 10 not produce vertically constraint to valve rod.
Valve rod of the present utility model is designed to latus rectum axis structure, in the side that actuator is not installed, is designed with gap, and its effect is to make the valve plate can be automatically and seal ring centering, can overcome the impact that valve plate expands when worst hot case.
The utility model embodiment's small-bore three eccentric butterfly valve is mainly used in the nitric acid tail gas turbine bypass of nitric acid tail gas Energy recovery machine set, the circulation medium temperature is generally at 500-600 ℃, during normal operation, valve is in closed condition, higher to the sealing class requirement, if the poorly sealed efficiency that can affect whole unit, cause economic loss.By the actual use on several covering devices, small-bore three eccentric butterfly valve of the present utility model is better in hot operating mode lower seal performance, guaranteed that small-bore three eccentric butterfly valve sealing elliptic surface can, because of the inconsistent situation generation that causes sealability to reduce of expanding, not make small-bore three eccentric hard sealed flygates all have consistent sealability at worst cold case with worst hot case under worst hot case.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (8)
1. a small-bore three eccentric butterfly valve, comprise valve body, described valve body is provided with valve plate, described valve plate is connected with valve rod, it is characterized in that, the surface of contact of described valve body and valve plate is provided with seal ring, be fixed with pressing plate on described valve body, form groove between described valve body and pressing plate, described seal ring is arranged in described groove in the side near valve body, be provided with clearance for expansion between the collar wall of described seal ring and the inwall of described groove, described clearance for expansion can make described seal ring not retrained by groove when hot expansion.
2. small-bore three eccentric butterfly valve according to claim 1, is characterized in that, is provided with between described seal ring and described pressing plate and strengthens the composite graphite pad.
3. small-bore three eccentric butterfly valve according to claim 1, is characterized in that, is provided with between described seal ring and described valve body and strengthens the composite graphite pad.
4. small-bore three eccentric butterfly valve according to claim 3, is characterized in that, in described groove, is provided with guide finger, and described guide finger is fixed on described valve body, and described seal ring is set on described guide finger.
5. small-bore three eccentric butterfly valve according to claim 4, it is characterized in that, described seal ring is provided with the first guiding groove, described reinforcement composite graphite pad is provided with the second guiding groove, described the first guiding groove and the second guiding groove are positioned on same axis, described guide finger one end is arranged in the first guiding groove and the second guiding groove, and the described guide finger the other end is fixed on described valve body.
6. small-bore three eccentric butterfly valve according to claim 1, is characterized in that, described pressing plate is fixed on described valve body by hold-down bolt; Described pressing plate function just plays the precompressed effect to the active force on seal ring to seal ring, makes seal ring can not produce and rock or displacement, when worst hot case, can not produce constraint to the expansion of seal ring again.
7. small-bore three eccentric butterfly valve according to claim 1, is characterized in that, described valve rod is latus rectum axis structure, in the side that actuator is not installed, is provided with gap.
8. according to the described small-bore three eccentric butterfly valve of claim 1-7 any one, it is characterized in that, described valve plate has cemented carbide with the sealing surface weld deposit that described seal ring contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220625240 CN202955245U (en) | 2012-11-22 | 2012-11-22 | Small-aperture triple eccentric butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220625240 CN202955245U (en) | 2012-11-22 | 2012-11-22 | Small-aperture triple eccentric butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202955245U true CN202955245U (en) | 2013-05-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220625240 Expired - Fee Related CN202955245U (en) | 2012-11-22 | 2012-11-22 | Small-aperture triple eccentric butterfly valve |
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| CN (1) | CN202955245U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836208A (en) * | 2012-11-22 | 2014-06-04 | 中国石油天然气集团公司 | Small-bore three-eccentric center butterfly valve and purpose thereof |
-
2012
- 2012-11-22 CN CN 201220625240 patent/CN202955245U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836208A (en) * | 2012-11-22 | 2014-06-04 | 中国石油天然气集团公司 | Small-bore three-eccentric center butterfly valve and purpose thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130529 Termination date: 20211122 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |