CN201636338U - Check valve for large-caliber power plant - Google Patents
Check valve for large-caliber power plant Download PDFInfo
- Publication number
- CN201636338U CN201636338U CN2010201371665U CN201020137166U CN201636338U CN 201636338 U CN201636338 U CN 201636338U CN 2010201371665 U CN2010201371665 U CN 2010201371665U CN 201020137166 U CN201020137166 U CN 201020137166U CN 201636338 U CN201636338 U CN 201636338U
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- Prior art keywords
- valve
- flap
- seat ring
- ring
- fixture
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- 238000007789 sealing Methods 0.000 claims abstract description 22
- 210000004907 Glands Anatomy 0.000 claims description 16
- 210000003660 Reticulum Anatomy 0.000 claims description 11
- 239000011901 water Substances 0.000 claims description 4
- 230000037250 Clearance Effects 0.000 abstract description 4
- 230000035512 clearance Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering processes Methods 0.000 description 3
- 238000000034 methods Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000007906 compression Methods 0.000 description 2
- 230000002209 hydrophobic Effects 0.000 description 2
- 239000000956 alloys Substances 0.000 description 1
- 229910045601 alloys Inorganic materials 0.000 description 1
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical class data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052803 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 238000006073 displacement reactions Methods 0.000 description 1
- 230000003628 erosive Effects 0.000 description 1
- 239000000463 materials Substances 0.000 description 1
- 238000002360 preparation methods Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Abstract
Description
Technical field
The utility model is about a kind of heavy caliber power station stop valve that is used for large-size thermal power plant High Temperature High Pressure system.
Background technique
Traditional heavy caliber power station stop valve, valve body sealing surface is the body built-up welding, take a lot of work, time-consuming, expense material, to operator and inspector's technical requirements height, and can't the quality of processing (being hardness, surface roughness, Percent of contact area and the painted scratch of sealing surface) of its sealing surface be detected, judge by inspector's experience fully; Simultaneously, can't use advanced surfacing equipment again, can only adopt manual build up welding, technology falls behind.Therefore; traditional heavy caliber power station uses stop valve because of its structural design and processing technology that falls behind; can't adapt to the development of power generating equipment maximization, high parameterization, high performance; and the run, drip, leak phenomenon occurs through regular meeting when it is applied in the main system of boiler, steam turbine, have a strong impact on the economic benefit and the safety of power plant.
The hydrophobic power station of the high pressure stop valve that discloses among the Chinese patent specification CN2716604Y, its movable valve seat (being seat ring) only could be compacted when valve closing, and behind valve opening, movable valve seat then is in no impaction state.Therefore, the selfsealings circle under the movable valve seat is subject to erosion, the displacement of high-pressure medium, thereby influences the sealing effect behind the valve closing greatly.
In addition, flap in this patented technology and valve rod are the overall structures that forms by being threaded: 1) though be furnished with the valve pocket guiding, the overall structure processing that double thread connects and the required precision of assembling are higher, otherwise influence the seat rate of returning of flap, thereby influence the leakproofness of valve; 2) owing to being overall structure, when valve closing, when particularly electric valve is closed; owing to be the stroke protection; so the high-pressure seal ring below the movable valve seat is subjected to high pressure and is compressed, movable valve seat and flap this to producing the gap between the sealing pair, make valve can not fasten and leak.
The utility model is on stop valve structure basis, the hydrophobic power station of the high pressure of prior art, its structure is improved, to remedy the problem that prior art exists.
The model utility content
Main purpose of the present utility model is to provide a kind of make, conveniently use maintenance, the comprehensive good heavy caliber power station stop valve of usability rational in infrastructure, convenient.
For achieving the above object, the utility model heavy caliber power station with the technological scheme that stop valve adopted is: a kind of heavy caliber power station stop valve, it includes the seat ring fixed structure, flap linkage structure and self sealing structure, described seat ring fixed structure comprises valve body, high-pressure seal ring and seat ring, described flap linkage structure comprises flap and valve rod, described self sealing structure comprises valve gap, the selfsealings circle, gasket ring, support and and cap, be provided with annular groove in the described valve body, described annular groove is connected with the water inlet of described valve body, the lower end of described annular groove is provided with the circular groove that is used to hold described seat ring, the lower end of described circular groove is provided with the aperture that is connected with the osculum of described valve body, and described flap linkage structure also includes pad, divided ring, stopping shim and flap lid:
The mesopore bottom of described flap is provided with circular groove, and described pad is arranged in the described circular groove and the spherical termination that can withstand described valve rod;
Described flap lid is arranged between described flap and the described valve rod and with described flap and is threaded;
The upper end of described flap lid is the flange that is erected on the described flap, and described stopping shim is arranged between described flange and the described flap;
Described divided ring be arranged in described flap lid the lower end, be arranged on the circular groove of described valve rod end, and described divided ring leaves the gap along the axial direction of described valve rod between covering with described flap.
Described seat ring fixed structure also includes seat ring fixture and seat ring fixture gland:
Described seat ring fixture is set in outside the described flap, and the lower end of described seat ring fixture is connected with the upper-end surface of described seat ring;
Be provided with described seat ring fixture gland in the upper end of described seat ring fixture, the upper end of described seat ring fixture gland is the three-jaw structure, and described seat ring fixture gland and described valve body are by being threaded to compress described seat ring fixture.
Described self sealing structure also comprises bonnet gasket, and described bonnet gasket is arranged between described support and described and the cap, is compressed by described and cap.
The big cylindrical top of described valve gap is provided with 45 ° of chamferings, is provided with described selfsealings circle, gasket ring, support, bonnet gasket and and cap on described 45 ° of chamferings successively.
Adopt the beneficial effect of technique scheme to be:
1, the seat ring fixer structure of being formed by valve body, high-pressure seal ring, seat ring, seat ring fixture, seat ring fixture gland, even when valve opening, still can fix effectively and pressed against valve seat and high-pressure seal ring, thereby guaranteed the leakproofness of valve, improved every performance of valve, and preparation process simplification, safe in utilization, easy to maintenance.
2, the flap linkage structure of forming by flap, pad, divided ring, stopping shim, flap lid and valve rod, owing to be movable connection structure: 1) required precision that flap is connected with valve rod is lower, but under the leading role of seat ring fixture, time seat rate of flap but can improve greatly, has guaranteed the leakproofness of valve; 2) because flap and valve rod are flexible connection, and leave certain clearance axially, like this behind the valve closing, under the further effect of fluid medium pressure, high-pressure seal ring is compressed and can produces micro-gap, therefore can play automatic compression compensating action, has guaranteed the leakproofness of valve.
3, the self sealing structure of being made up of valve gap, selfsealings circle, gasket ring, support, bonnet gasket and cap has been simplified the structure that support is connected with valve body, makes pressure high more, and the sealing of structure is good more.
Description of drawings
Fig. 1 manually controls the structural drawing of the utility model heavy caliber power station with stop valve.
Fig. 2 is the structural drawing of electronic control the utility model heavy caliber power station with stop valve.
Wherein, 1 valve body, 2 high-pressure seal rings, 3 seat rings, 4 flaps, 5 pads, 6 divided rings, 7 stopping shims, 8 flaps lid, 9 seat ring fixtures, 10 valve rods, 11 seat ring fixture glands, 12 valve gaps, 13 selfsealings circles, 14 gasket rings, 15 supports, 16 bonnet gaskets, 17 and cap, 18 control switchs, 19 annular grooves, 20 water inlets, 21 apertures, 22 osculums.
Embodiment
Following structure accompanying drawing is described in further detail specific embodiment of the utility model.
As shown in Figure 1 and Figure 2, the utility model heavy caliber power station stop valve, it includes seat ring fixed structure, flap linkage structure and self sealing structure.The seat ring fixed structure comprises valve body 1, high-pressure seal ring 2 and seat ring 3, and the flap linkage structure comprises flap 4 and valve rod 10, and self sealing structure comprises valve gap 12, selfsealings circle 13, gasket ring 14, support 15 and and cap 17.Be provided with annular groove 19 in the valve body 1, annular groove 19 is connected with the water inlet 20 of valve body 1, the lower end of annular groove 19 is provided with the circular groove that is used to hold seat ring 3, the lower end of this circular groove is provided with the aperture 21 that is connected with the osculum 20 of valve body 1, is provided with high-pressure seal ring 2 in the groove of the lower end of seat ring 3.Interconnected relationship between the above-mentioned miscellaneous part is same as the prior art, does not therefore too much give unnecessary details here.Wherein, the utility model heavy caliber power station stop valve, its control switch 18 can adopt manually, also can adopt electronic and pneumatic.
Flap linkage structure in the utility model also includes pad 5, divided ring 6, stopping shim 7 and flap lid 8.The mesopore bottom of flap 4 is provided with circular groove, and pad 5 is arranged in the described circular groove and the spherical termination that can withstand valve rod 10.When valve closing, especially for the stop valve of electronic control, the stroke that its flap 4 is opened during because of valve opening is fixed, so valve rod 10 can contact with the point of pad 5 by its spherical termination, realizes automatic centering seat ring 3.
Flap lid 8 is arranged between flap 4 and the valve rod 10, and flap covers 8 and is threaded with flap 4.The upper end of flap lid 8 is the flange that is erected on the flap 4, and stopping shim 7 is arranged between described flange and the flap 4.By stopping shim 7 is set, when valve opening, can effectively prevent being connected between flap lid 8 and the flap 4 owing to the thrust that is subjected to high-pressure fluid medium produces loosening.
Divided ring 6 is arranged in the lower end of flap lid 8 and is arranged on the circular groove of valve rod 10 ends, and the axial direction along valve rod 10 leaves certain clearance between divided ring 6 and the flap lid 8.Owing to have certain axial clearance between divided ring 6 and the flap lid 8, therefore when valve closing, can reduce the downward pressure that valve rod 10 and high-pressure fluid medium are produced high-pressure seal ring 2, thereby play the effect of compression compensation, guarantee the leakproofness of valve.
Seat ring fixed structure in the utility model also includes seat ring fixture 9 and seat ring fixture gland 11.Seat ring fixture 9 is set in outside the flap 4, and the lower end of seat ring fixture 9 is connected with the upper-end surface of seat ring 3, and the upper end of seat ring fixture 9 is provided with seat ring fixture gland 11.The upper end of seat ring fixture gland 11 is the three-jaw structure, and seat ring fixture gland 11 is connected and pressed against valve seat fixture 9 with valve body 1 by outside thread.Thus,, seat ring fixture gland 11 and valve body 1 are tightened by the three-jaw of turn seat ring fixture gland 11 upper ends, and pressed against valve seat fixture 9.Therefore, no matter valve is in is closed or opening state, and the seat ring fixed structure in the utility model can both be fixed and pressed against valve seat 3 and high-pressure seal ring 2 effectively, has guaranteed the leakproofness of valve, has improved every performance of valve.
Self sealing structure in the utility model also comprises bonnet gasket 16, bonnet gasket 16 be arranged on support 15 and and cap 17 between, by and cap 17 compress.The big cylindrical top of valve gap 12 is provided with 45 ° of chamferings, is provided with described selfsealings circle 13, gasket ring 14, support 15, bonnet gasket 16 and and cap 17 on 45 ° of chamferings successively.This designs simplification the linkage structure of support and valve body 1, make pressure high more, the sealing of structure is good more.
In addition, seat ring 3 adopts the built-up welding of Si Taili cobalt base hard alloy with the sealing surface of flap 4, has improved sealability greatly, and applicable to subcritical, supercritical generating unit.
The above is a preferred embodiments of the present utility model only, is not to be used for limiting to claim of the present utility model.The equivalent structure that all utilization the utility model specifications and accompanying drawing content are done changes, and all should be included in the scope of the utility model protection.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201371665U CN201636338U (en) | 2010-03-22 | 2010-03-22 | Check valve for large-caliber power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201371665U CN201636338U (en) | 2010-03-22 | 2010-03-22 | Check valve for large-caliber power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201636338U true CN201636338U (en) | 2010-11-17 |
Family
ID=43080830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201371665U CN201636338U (en) | 2010-03-22 | 2010-03-22 | Check valve for large-caliber power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201636338U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606750A (en) * | 2010-12-29 | 2012-07-25 | 大连大高阀门有限公司 | Nuclear class I electric cobalt-free modularized stop valve |
| CN102865378A (en) * | 2012-10-10 | 2013-01-09 | 南通龙源电站阀门有限公司 | Anti-scouring stop valve |
| CN103322219A (en) * | 2013-07-05 | 2013-09-25 | 昆山维萨阀门有限公司 | Stop valve capable of preventing valve clack from rotating |
| CN103615592A (en) * | 2013-11-11 | 2014-03-05 | 锦州高中压阀门制造有限公司 | High-temperature high-pressure oblique stop valve |
| CN103994242A (en) * | 2014-05-14 | 2014-08-20 | 吴忠仪表有限责任公司 | Axial sealing structure of control valve |
| CN109469765A (en) * | 2018-03-26 | 2019-03-15 | 冯光 | Antiscour high-differential-pressure regulating valve self-sealing work valve seat |
-
2010
- 2010-03-22 CN CN2010201371665U patent/CN201636338U/en not_active IP Right Cessation
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606750A (en) * | 2010-12-29 | 2012-07-25 | 大连大高阀门有限公司 | Nuclear class I electric cobalt-free modularized stop valve |
| CN102865378A (en) * | 2012-10-10 | 2013-01-09 | 南通龙源电站阀门有限公司 | Anti-scouring stop valve |
| CN103322219A (en) * | 2013-07-05 | 2013-09-25 | 昆山维萨阀门有限公司 | Stop valve capable of preventing valve clack from rotating |
| CN103615592A (en) * | 2013-11-11 | 2014-03-05 | 锦州高中压阀门制造有限公司 | High-temperature high-pressure oblique stop valve |
| CN103615592B (en) * | 2013-11-11 | 2015-08-19 | 锦州高中压阀门制造有限公司 | High-temperature high-pressure oblique stop valve |
| CN103994242A (en) * | 2014-05-14 | 2014-08-20 | 吴忠仪表有限责任公司 | Axial sealing structure of control valve |
| CN109469765A (en) * | 2018-03-26 | 2019-03-15 | 冯光 | Antiscour high-differential-pressure regulating valve self-sealing work valve seat |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EXPY | Termination of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20150322 |