CN104197012A - Steel forging valve and sealing connecting structure applicable to steel forging valve - Google Patents
Steel forging valve and sealing connecting structure applicable to steel forging valve Download PDFInfo
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- CN104197012A CN104197012A CN201410457829.4A CN201410457829A CN104197012A CN 104197012 A CN104197012 A CN 104197012A CN 201410457829 A CN201410457829 A CN 201410457829A CN 104197012 A CN104197012 A CN 104197012A
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Abstract
The invention relates to a sealing connecting structure applicable to a steel forging valve. The sealing connecting structure is used for sealing a valve body and a valve deck. The sealing connecting structure comprises a sealing connecting portion, a sealing groove, a groove and a transition segment, wherein the sealing groove contains a sealing part. A lip structure is formed at the outer end of the transition segment. A gap communicated with the groove is formed at the position of the transition segment and the lip structure. A welding joint is formed between the valve body and the valve deck through the lip structure in a welding mode so as to achieve sealing connection. The valve body and the valve deck form the reasonable transition segment through the groove and a lip, so that cold and thermal contraction generated by welding is elastically compensated for, welding stress is prevented from being concentrated at the position, the welding joint is conveniently sealed, cracks are not likely to be formed, and the welding quality is improved. Due to the groove structure, the radiating effect can be achieved during sealing welding, and the sealing part is protected against damage caused by overheating during welding. The welding joint at the position of the sealing part and the lip structure forms a dual-sealing structure, and it is ensured that a cavity in the valve is absolutely sealed when the valve is used for a long time. In addition, the invention further relates to the steel forging valve.
Description
Technical field
The present invention relates to a kind of Hermetical connecting structure and forged steel valve that is applicable to forged steel valve, belong to technical field of valve manufacturing.
Background technique
Forged steel valve is mainly applicable on the pipeline of the various systems of firepower power station, can be used for controlling flowing of all kinds fluids such as air, water, steam, various Korrosionsmedium, mud, oil product, liquid metal and radiating medium.The feature that forged steel valve is compared with other valve products is high temperature high voltage resistant, needs stronger sealability.The valve body of forged steel valve and valve gap joining portion are that lumen is the main outer leak source of valve, when medium contains toxic substance or has radiativity, between valve body and valve gap, because poor sealing medium very easily leaks, cause the severe contamination of surrounding enviroment, bring huge economic loss and potential safety hazard.
Chinese patent literature CN2931986Y discloses a kind of nuclear grade valve valve body and has been connected lip weldering sealing configuration with valve gap, comprise valve body and valve gap, by the periphery at valve body and valve gap joint, be provided with lip limit structure, at valve body, become seal ring with the lip limit continuous sealing of structure of valve gap.This valve is sealed seal by lip side weld and completes the second layer and seal, and can reach long-time running positive confinement effect; Meanwhile, in the time need to dismantling being connected of valve body and valve gap, only lip need be welded to seal ring and cut, and form new seal ring, detachable three times by sealing again.Yet this lip limit structure is directly connected with valve gap with valve body, this rigid construction can cause weld stress concentrations while re-starting welding after cutting, affect weldquality (such as crack etc. easily appears in weld seam), and this valve is difficult to leave at the formation heat that forms weld seam, welding heat easily damages Sealing, this valve body after just causing being difficult to guaranteeing again again welding and the secondary seal of valve gap.In addition, this valve is bolted valve body and valve gap, and valve body and valve gap are outwardly, and to form bolt fastening structure, lip limit structure can only be molded over the recess between valve body and the bump of valve gap, and this structure can hinder formation and the cutting operation of weld seam.
Summary of the invention
For this reason, technical problem to be solved by this invention is to be difficult to reach the technical problem of original welded seal performance after the high seal valve body of existing employing welding manner sealed valve body and valve gap is difficult to cut weld seam in dismounting, when maintenance, thereby proposes a kind of valve body sealing structure that can guarantee valve body welded seal after weld seam that repeatedly cuts.
In addition, technical problem to be solved by this invention is to be difficult to reach the technical problem of original welded seal performance after the high seal valve body of existing employing welding manner sealed valve body and valve gap is difficult to cut weld seam in dismounting, when maintenance, thereby proposes a kind of forged steel valve that can guarantee valve body welded seal after weld seam that repeatedly cuts.
For solving the problems of the technologies described above, a kind of Hermetical connecting structure that is applicable to forged steel valve of the present invention, for sealed valve body 1 and valve gap 2, comprise: be formed on the stair-stepping portion that is tightly connected between valve body 1 and valve gap 2, be molded over the seal groove that holds Sealing at the first ladder place, also comprise the groove that is molded over the second ladder place, the described portion that is tightly connected is outwardly forms the changeover portion that thickness reduces gradually, described changeover portion outer end forms lip limit structure, between described valve body and described valve gap, at described changeover portion and structure place, lip limit, be formed with the gap being connected with described groove, described lip limit structure makes valve body and valve gap formation weld seam be tightly connected to reach by welding.
Hermetical connecting structure of the present invention, the minimum thickness of described weld seam meets following formula:
wherein, T is weld seam minimum thickness, the mm of unit; R is body cavity radius, the mm of unit; P is valve design proof pressure, the Mpa of unit; S is valve material allowable stress, the Mpa of unit.
Hermetical connecting structure of the present invention, the welding procedure that described lip limit structure is filled metal by nothing makes valve body and valve gap formation weld seam be tightly connected to reach.
Hermetical connecting structure of the present invention, the degree of depth of described groove is 3-8mm, is highly 2-4mm.
Forged steel valve of the present invention, described groove has the transition gap section reducing gradually towards described gap direction height.
Hermetical connecting structure of the present invention, the height in described gap is 0.5-1mm, the degree of depth in described gap is 3.5-12mm.
Hermetical connecting structure of the present invention, the proportion of the length of described lip limit structure and the minimum thickness of described weld seam is 1.5-3.5:1.
Hermetical connecting structure of the present invention, the thickness of described lip limit structure is 3-7mm, the length of described lip limit structure is 1.5-5mm.
Hermetical connecting structure of the present invention, the length of described changeover portion is 2-7mm.
Hermetical connecting structure of the present invention, adopts above-mentioned valve body sealing structure to be tightly connected between described valve body and valve gap.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) Hermetical connecting structure of the present invention, makes the weld seam of forged steel valve of the present invention after cutting away by lip limit structure is set, and has enough materials and space to form weld seam next time between valve body, valve gap.At valve body, valve gap, by groove and lip limit structure, form rational changeover portion, the cold and hot contraction can elastic compensating producing because of welding, prevents that welding stress from concentrating herein, prevents seal weld cracking, improves welding quality.By the structure of groove is set, during seal weld, play thermolysis, protection Sealing is overheated and cause damage in when welding.And form double sealing structure by the weld seam at Sealing and structure place, lip limit, make valve guarantee the positive confinement of valve lumen in the long-term process of using.
(2) Hermetical connecting structure of the present invention, by the minimum thickness formula of weld seam, just can calculate the minimum thickness numerical value of weld seam, can be according to this formula according to the thickness of the situation design weld seam of valve body when design, in actual production, the weld seam that welding is obtained is a bit larger tham the minimum thickness value of this weld seam, can guarantee the sealing of welding rear valve body.
(3) Hermetical connecting structure of the present invention, the welding procedure that described lip limit structure is filled metal by nothing makes valve body and valve gap formation weld seam be tightly connected to reach.Without the welding procedure of filling metal, do not use welding wire, scolder, the structural material in described lip limit is directly melted and form thin wall-type weld seam, this throat depth is thin, narrow, even, and the weld seam of filling the welding procedure of metal by nothing welds without heat treatment, weld seam metallographic, hardness meet standard-required, have reduced the production process of valve.
(4) forged steel valve of the present invention, is used above-mentioned Hermetical connecting structure, makes forged steel valve of the present invention possess above-mentioned advantage.
Accompanying drawing explanation
For content of the present invention is more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the structural representation of the present invention's forged steel valve of containing valve body sealing structure;
Fig. 2 is the enlarged view at circle position in Fig. 1;
Fig. 3 is each part dimension mark of Fig. 2 figure.
In figure, reference character is expressed as: 1-valve body; 2-valve gap; 3-Sealing; 4-seal groove; 5-changeover portion; 6-lip limit structure; 7-groove; 8-weld seam; 9-gap; 10-transition gap section.
Embodiment
Below in conjunction with accompanying drawing, sealing configuration of the present invention and forged steel valve are elaborated.
Embodiment 1
The present embodiment provides a kind of Hermetical connecting structure that is applicable to forged steel valve, valve material is stainless steel, certainly this valve material also can be for carbon steel etc., as Fig. 1, shown in 2, for sealed valve body 1 and valve gap 2, comprise: be formed on the stair-stepping portion that is tightly connected between valve body 1 and valve gap 2, be molded over the seal groove that holds Sealing 34 at the first ladder place, also comprise the groove 7 that is molded over the second ladder place, described groove 7 has the transition gap section 10 reducing gradually towards described gap 9 direction height, the described portion that is tightly connected is outwardly forms the changeover portion 5 that thickness reduces gradually, in the present embodiment, described changeover portion 5 adopts arc-shaped transition mode, described changeover portion 5 outer ends form lip limit structure 6, between described valve body 1 and described valve gap 2, at described changeover portion 5 and structure 6 places, lip limit, be formed with the gap 9 being connected with described groove 7, described lip limit structure 6 makes valve body 1 and valve gap 2 formation weld seams 8 be tightly connected to reach by welding.
By lip limit structure 6 is set, make the weld seam 8 of Hermetical connecting structure of the present invention after cutting away, between valve body 1, valve gap 2, have enough materials and space to form weld seam next time.On valve body 1, valve gap 2, between groove 7 and lip limit structure 6, form rational changeover portion 5, the cold and hot contraction can elastic compensating producing because of welding, prevents that welding stress from concentrating herein, prevents weld seam 8 crackings, improves welding quality.By the structure of groove 7 is set, during seal weld, play thermolysis, protection Sealing 3 is overheated and cause damage in when welding.Weld seam 8 by Sealing 3 and structure 6 places, lip limit forms double sealing structure, makes valve guarantee the positive confinement of valve lumen in the long-term process of using.
The Hermetical connecting structure of the present embodiment, the welding procedure that described lip limit structure 6 is filled metal by nothing makes valve body 1 and valve gap 2 formation weld seams 8 be tightly connected to reach.Without the welding procedure of filling metal, do not use welding wire, scolder, make the material in described lip limit structure 6 directly melt formation thin wall-type weld seam, this throat depth is thin, narrow, even, and the weld seam of filling the welding procedure of metal by nothing welds without heat treatment, weld seam metallographic, hardness meet standard-required, have reduced production and the installation procedure of valve body.
The Hermetical connecting structure of the present embodiment, the inserting end surface forming that described valve body 1 inwall and described valve gap 2 stretch into body cavity has the screw thread cooperatively interacting.By screw-thread fit, connect, make the structure of valve and bolted valve structure compared simpler, compact, and reduce the volume of valve lumen, alleviated the weight of whole valve.
The Hermetical connecting structure of the present embodiment, the degree of depth of described groove 7, highly, the height in described gap 9, the degree of depth, the numerical value of the length of thickness, length and the changeover portion of lip limit structure 6 is as shown in table 1 embodiment 1.
Embodiment 2
The present embodiment provides a kind of Hermetical connecting structure that is applicable to forged steel valve, itself and embodiment's 1 difference is, the degree of depth of described groove 7, highly, the height in described gap 9, the degree of depth, the numerical value of the length of thickness, length and the changeover portion of lip limit structure 6 is different, and the data in the present embodiment are as shown in table 1 embodiment 2.
Embodiment 3
The present embodiment provides a kind of Hermetical connecting structure that is applicable to forged steel valve, itself and embodiment's 1 difference is, the degree of depth of described groove 7, highly, the height in described gap 9, the degree of depth, the numerical value of the length of thickness, length and the changeover portion of lip limit structure 6 is different, and the data in the present embodiment are as shown in table 1 embodiment 3.
Embodiment 4
The present embodiment provides a kind of Hermetical connecting structure that is applicable to forged steel valve, itself and embodiment's 1 difference is, the degree of depth of described groove 7, highly, the height in described gap 9, the degree of depth, the numerical value of the length of thickness, length and the changeover portion of lip limit structure 6 is different, and the data in the present embodiment are as shown in table 1 embodiment 4.
Embodiment 5
The present embodiment provides a kind of Hermetical connecting structure that is applicable to forged steel valve, itself and embodiment's 1 difference is, the degree of depth of described groove 7, highly, the height in described gap 9, the degree of depth, the numerical value of the length of thickness, length and the changeover portion of lip limit structure 6 is different, and the data in the present embodiment are as shown in table 1 embodiment 5.
Every data of table 1 embodiment 1-5 valve body sealing structure
The weld seam of the Hermetical connecting structure in embodiment 1-5 is cut open, valve is re-assemblied, use without the welding procedure of filling metal and make valve body 1 and valve gap 2 again form weld seam, and butt welded seam carries out pressure-bearing test.Again cut weld seam, and take out and observe the pattern of Sealing 3, by the observation to Sealing 3, Sealing 3 smooth in appearance, are not subject to the impact of the heat that structure place, lip limit produces in when welding and are out of shape, turn black, and Sealing 3 is not damaged.Result to pressure-bearing test shows, the weld seam that valve forms again can sustain valve design proof pressure 6MPa.
It should be noted that, although above-described embodiment 1-5 has provided the supplemental characteristic of all parts of Hermetical connecting structure of the present invention, but in order to realize object of the present invention, the degree of depth of described groove 7 can change within the scope of 3-8mm, groove 7 height change simultaneously within the scope of 2-4mm; The height in described gap 9 for changing within the scope of 0.5-1mm, and the degree of depth in described gap 9 changes simultaneously within the scope of 3.5-12mm; The thickness of described lip limit structure 6 can change within the scope of 3-7mm, and the length of described lip limit structure 6 can change within the scope of 1.5-5mm; The length of described changeover portion can change within the scope of 2-7mm.
The minimum thickness of weld seam 8 calculates by following formula: the minimum thickness of described weld seam 8 meets following formula:
wherein, T is weld seam minimum thickness, the mm of unit; R is body cavity radius, the mm of unit; P is valve design proof pressure, is 6MPa; S is valve material allowable stress, and material is 138MPa while being F304 and A105N.By this formula, just can calculate the numerical value of the minimum thickness of weld seam, can be according to this formula according to the thickness of the situation design weld seam of valve body when design, in actual production, the weld seam that welding is obtained is a bit larger tham the minimum thickness value of this weld seam, can guarantee the sealing of welding rear valve body.
The proportion that it should be noted that the length of described lip limit structure and the minimum thickness of described weld seam is 1.5-3.5:1.Because structure fusing in lip limit forms weld seam, the ratio of the length of lip limit structure and the minimum thickness of described weld seam is that the number of times that cuts as required welding is again determined, when forged steel valve body only need to cut while again welding one time, the length of lip limit structure should at least enough form the weld seam of a minimum thickness, thereby the ratio of the length of lip limit structure and the minimum thickness of weld seam minimum is 1.5:1, when needs repeatedly cut welding, during such as 3 times, the ratio of the length of lip limit structure and the minimum thickness of weld seam is 3.5:1, certainly for guaranteeing sealing, in general the weld seam that welding forms is slightly larger than the minimum thickness value that calculates weld seam, therefore the proportion of the length of lip limit structure and the minimum thickness of weld seam floats between 1.5-3.5:1.
Embodiment 6
The present embodiment provides a kind of forged steel valve, the inserting end surface forming that described valve body 1 inwall and described valve gap 2 stretch into body cavity has the screw thread cooperatively interacting, and adopts the valve body sealing structure described in embodiment 1 or 2 or 3 or 4 or 5 to be tightly connected between described valve body 1 and valve gap 2.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to mode of execution.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all mode of executions.And the apparent variation of being extended out thus or change are still among the protection domain in the invention.
Claims (10)
1. a Hermetical connecting structure that is applicable to forged steel valve, for sealed valve body (1) and valve gap (2), comprise: be formed on the stair-stepping portion that is tightly connected between valve body (1) and valve gap (2), be molded over the seal groove that holds Sealing (3) (4) at the first ladder place, it is characterized in that: also comprise the groove (7) that is molded over the second ladder place, the described portion that is tightly connected is outwardly forms the changeover portion (5) that thickness reduces gradually, described changeover portion (5) outer end forms lip limit structure (6), between described valve body (1) and described valve gap (2), at described changeover portion (5) and lip limit structure (6), locate to be formed with the gap (9) being connected with described groove (7), described lip limit structure (6) makes valve body (1) and valve gap (2) formation weld seam be tightly connected to reach by welding.
2. Hermetical connecting structure as claimed in claim 1, is characterized in that, the minimum thickness of described weld seam meets following formula:
wherein, T is weld seam minimum thickness, the mm of unit; R is body cavity radius, the mm of unit; P is valve design proof pressure, the Mpa of unit; S is valve material allowable stress, the Mpa of unit.
3. Hermetical connecting structure as claimed in claim 2, is characterized in that, the welding procedure that described lip limit structure (6) is filled metal by nothing makes valve body (1) and valve gap (2) formation weld seam (8) be tightly connected to reach.
4. Hermetical connecting structure as claimed in claim 2, is characterized in that, the degree of depth of described groove (7) is 3-8mm, is highly 2-4mm.
5. Hermetical connecting structure as claimed in claim 3, is characterized in that, described groove (7) has the transition gap section (10) reducing gradually towards described gap (9) direction height.
6. the Hermetical connecting structure as described in claim 1-5 any one, is characterized in that, the height of described gap (9) is 0.5-1mm, and the degree of depth in described gap is 3.5-12mm.
7. the Hermetical connecting structure as described in claim 2-5 any one, is characterized in that, the proportion of the length of described lip limit structure (6) and the minimum thickness of described weld seam is 1.5-3.5:1.
8. Hermetical connecting structure as claimed in claim 7, the thickness of described lip limit structure (6) is 3-7mm, the length of described lip limit structure (6) is 1.5-5mm.
9. Hermetical connecting structure as claimed in claim 6, the length of described changeover portion is 2-7mm.
10. a forged steel valve, comprises valve body (1) and valve gap (2), it is characterized in that, adopts the valve body sealing structure as described in claim 1-9 to be tightly connected between described valve body (1) and valve gap (2).
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| CN201410457829.4A CN104197012B (en) | 2014-09-10 | 2014-09-10 | Steel forging valve and sealing connecting structure applicable to steel forging valve |
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| CN201410457829.4A CN104197012B (en) | 2014-09-10 | 2014-09-10 | Steel forging valve and sealing connecting structure applicable to steel forging valve |
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| CN104197012B CN104197012B (en) | 2017-01-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107917264A (en) * | 2017-11-29 | 2018-04-17 | 北京航天动力研究所 | A kind of ultralow temperature super-pressure static seal joint structure connecting valve |
| CN110630796A (en) * | 2019-10-23 | 2019-12-31 | 浙江伯特利科技有限公司 | All-welded stop valve and assembling/welding process and tool thereof |
| CN110715095A (en) * | 2019-10-23 | 2020-01-21 | 浙江伯特利科技有限公司 | All-welded gate valve and assembling/welding process and tool thereof |
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| CN103752995A (en) * | 2013-12-20 | 2014-04-30 | 哈尔滨工业大学 | Valve stress dispersion based welding method |
| CN103982673A (en) * | 2014-05-29 | 2014-08-13 | 昆山维萨阀门有限公司 | All-welded ball valve |
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2014
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107917264A (en) * | 2017-11-29 | 2018-04-17 | 北京航天动力研究所 | A kind of ultralow temperature super-pressure static seal joint structure connecting valve |
| CN110630796A (en) * | 2019-10-23 | 2019-12-31 | 浙江伯特利科技有限公司 | All-welded stop valve and assembling/welding process and tool thereof |
| CN110715095A (en) * | 2019-10-23 | 2020-01-21 | 浙江伯特利科技有限公司 | All-welded gate valve and assembling/welding process and tool thereof |
| CN110715095B (en) * | 2019-10-23 | 2023-08-22 | 浙江伯特利科技股份有限公司 | All-welded gate valve and assembling/welding process and tool thereof |
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