CN102518823B - Valve seat sealing structure - Google Patents
Valve seat sealing structure Download PDFInfo
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- CN102518823B CN102518823B CN201110444659.2A CN201110444659A CN102518823B CN 102518823 B CN102518823 B CN 102518823B CN 201110444659 A CN201110444659 A CN 201110444659A CN 102518823 B CN102518823 B CN 102518823B
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- ring
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- guard ring
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- valve seat
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Abstract
The invention discloses a valve seat sealing structure with longer service life. The valve seat sealing structure comprises a valve seat ring, and a gate or a ball, wherein the valve seat ring is provided with a seal ring with a triangular section, and a guard ring made of a polytetrafluoroethylene or nylon material opposite to the surface of the gate or the ball; the compressive strength of the guard ring is higher than that of the seal ring; the guard ring is positioned on the inner side of the seal ring; and a contact surface between the guard ring and the gate or the ball is provided with a groove communicating the inside and outside of the guard ring and serving as a pressure balancing channel. A valve with the sealing structure has longer service life, and can rotate throughout the year more reliably; the operating torque of the valve is properly reduced, and the valve is convenient to open and close; and the valve can normally work under the condition that a transmission medium is dirty and disordered, the application range of the valve is widened, and the valve seat sealing structure is mainly used for flat gate valves or ball valves.
Description
Technical field
The present invention relates to a kind of plate valve or ball valve, the valve seat of especially a kind of plate valve or ball valve.
Background technique
Groundwork principle and the fixing ball valve of plate valve are similar, and the seat ring of valve valve seat is subject to the promotion of liquid pressure, are tightly affixed to flashboard or spheroid, and the soft sealing material that the seat ring groove on seat ring is embedded in will contact with flashboard or spheroid, form sealing.
The mode that ordinary flat gate valve generally embeds in the employing of valve seat place is O type circle fixedly, to form sealing.When valve seal, there is deformation in valve seat O type circle, fit tightly flashboard under the effect of liquid pressure, forms sealing surface.Yet now the deformation of valve seat is generally uncontrolled, amount of deformation is mainly determined by the material mechanicalness the subject of knowledge and the object of knowledge of O type circle, from microcosmic, after distortion, between the notch of O type circle and seat ring groove, there is shear force, in the long-term process of using of valve, thereby cause the amount of deformation of O type circle to strengthen because pressure changes, thereby cause O type circle by seat ring notch, worn and torn and occur otch phenomenon, finally cause valve primary seal to lose efficacy.
Same reason, the O type circle of ordinary ball valve is the easily appearance shearing of present ring recess mouth place and inordinate wear also, finally causes valve primary seal to lose efficacy.
In addition, when liquid pressure is higher, the amount of deformation of O type circle increases thereupon, and the surface of contact between O type circle and flashboard or spheroid increases, and the operation moment of torsion of valve strengthens, and is not easy to the switching manipulation of valve.
Summary of the invention
In order to overcome existing plate valve or ball seat sealing configuration shorter deficiency in working life, technical problem to be solved by this invention is to provide a kind of valve base sealing structure of longer service life.
The technical solution adopted for the present invention to solve the technical problems is: valve base sealing structure, comprise valve seat seat ring, flashboard or spheroid, on the face of valve seat seat ring corresponding to flashboard or spheroid, be provided with seal ring, valve seat seat ring is corresponding to being also provided with guard ring on the face of flashboard or spheroid, the compressive strength of guard ring is higher than the compressive strength of seal ring, and guard ring is positioned at the inner side of seal ring, offers the pressure equalisation passage that is communicated with guard ring inner side and guard ring outside on guard ring.
Described guard ring is the flexible rings being arranged in the guard ring groove arranging on valve seat seat ring.
The material of described guard ring is teflon or nylon material.
Described guard ring is for valve seat seat ring one and protrude from valve seat seat ring and flashboard or surperficial lip that spheroid is corresponding, and the height of lip and the deformation band of seal ring adapt.
Further, described pressure equalisation passage is the groove being arranged on the surface of contact of guard ring and flashboard or spheroid.
In said structure, the seal ring that described seal ring is triangular-section, the seat ring groove adaptive with it is dovetail groove.
The invention has the beneficial effects as follows: valve longer service life, running throughout the year more reliably; Suitably reduce the operation moment of torsion of valve, be convenient to the switching manipulation of valve; Under the comparatively dirty and mixed and disorderly condition of transmission medium, also can normally work, expand the Applicable scope of valve, be mainly used in plate valve or ball valve.
Accompanying drawing explanation
Fig. 1 is the valve base sealing structure schematic diagram of existing plate valve.
Fig. 2 is the valve base sealing structure schematic diagram of existing ball valve.
Fig. 3 is the schematic diagram of the valve base sealing structure of plate valve of the present invention.
Fig. 4 is the schematic diagram of the valve base sealing structure of ball valve of the present invention.
Fig. 5 is the effect schematic diagram that pressure equalisation passage is set on guard ring.
Fig. 6 is the plan view of guard ring.
Fig. 7 is the A-A sectional view of Fig. 6.
In Fig. 1, Fig. 3, Fig. 5, solid arrow is liquid pressure direction, and in Fig. 1, dotted arrow is depicted as seat ring groove notch place shearing force direction, and dotted line circle is depicted as ring wear position.
In figure, be labeled as 1-seal ring, 2-guard ring, 3-valve seat seat ring, 4-flashboard, 5-valve seat, 6-seat ring groove, 7-spheroid, 8-O type circle, 9-guard ring groove, 10-the second seal ring, 20-pressure equalisation passage, 60-notch, d-distance.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As depicted in figs. 1 and 2, existing plate valve or ball valve are when valve seal, there is deformation in the O type circle 8 on valve seat 5, its amount of deformation mainly determines by the material mechanicalness the subject of knowledge and the object of knowledge of O type circle 8 under the effect of liquid pressure, and O type circle 8 fits tightly formation sealing surface with flashboard 4 or spheroid 7.Yet now on valve seat 5, the deformation of O type circle 8 is generally uncontrolled, illustrated can increasing and further dwindle with pressure apart from d.From microcosmic, between O type circle 8 after distortion and the notch 60 of seat ring groove 6, there is shear force, in the long-term process of using of valve, thereby because changing, pressure cause the amount of deformation of O type circle 8 to strengthen, thereby cause O type circle 8 by notch 60, worn and torn and occur otch phenomenon, finally cause valve primary seal to lose efficacy.
As shown in Fig. 3～Fig. 7, valve base sealing structure of the present invention comprises valve seat seat ring 3, flashboard 4 or spheroid 7, on the face of valve seat seat ring 3 corresponding to flashboard 4 or spheroid 7, be provided with seal ring 1 and guard ring 2, the compressive strength of guard ring 2 is higher than the compressive strength of seal ring 1, guard ring 2 is positioned at the inner side of seal ring 1, offers the pressure equalisation passage 20 that is communicated with guard ring inner side and guard ring outside on guard ring 2.
First, due to the compressive strength of guard ring 2 compressive strength higher than seal ring 1, guard ring 2 can be shared the pressure from liquid together with seal ring 1, within the scope of the pressure surge that can bear at it, limit the distance d of valve seat seat ring 3 and flashboard 4 or spheroid 7, the seal ring 1 of protection valve seat 5 is not by excess compression, and, after the pressure of seal ring 1 being shared by guard ring 2 from liquid, reduce, heel and toe wear and shear action between seal ring 1 and seat ring groove 6 are very little, substantially can avoid the seal ring 1 that causes because of seal ring 1 excess compression and heel and toe wear and the shear action between seat ring groove 6, thereby greatly extended the working life of seal ring 1.Simultaneously because seal ring 1 diminishes with the sealing surface area that contacts of flashboard 4 or spheroid 7, thereby reduce frictional force, made the switch of valve lighter.
Second, on guard ring 2, have pressure equalisation passage 20, make the pressure of guard ring 2 both sides in a basic balance, prevent that guard ring 2 from deviating under liquid pressure-acting from guard ring mounting groove, authorized pressure penetrates guard ring 2 and directes reach seal ring 1 position, and to acting on the liquid pressure of seal ring 1, there is buffer function when pressure surge, the sealing of valve is still guaranteed by the close contact between seal ring 1 and flashboard 4 or spheroid 7, the main position-limiting action of guard ring 2 limits the amount of deformation of seal ring 1, and this is guard ring in the present invention 2 and the essential distinction of existing double layer seal ring.
The 3rd, guard ring 2 can be wiped the minute impurities that remains in 7 of valve seat seat ring 3 and flashboard 4 or spheroids off when switch valve, avoid the irregular wear of these impurity to sealing surface of seat, therefore expanded the Applicable scope of plate valve or ball valve, for the environment that some transmission mediums are comparatively dirty and mixed and disorderly, also can normally work.
Obviously, during design, when the height that should make guard ring 2 protrude from valve seat seat ring 3 surfaces is less than seal ring 1 seal ring 1 protrudes from the height on valve seat seat ring 3 surfaces but is greater than seal ring 1 in limit compressive state when compressed state not, seal ring 1 protrudes from the height on valve seat seat ring 3 surfaces, be that the height that guard ring 2 protrudes from valve seat seat ring 3 surfaces will adapt with the deformation band of seal ring 1, the effect that guard ring 2 competence exertions are above-mentioned.
It should be noted that, under inevitable foozle, because the compressive strength of guard ring 2 is greater than seal ring 1, in the process that valve seat seat ring 3 is drawn close to flashboard 4 or spheroid 7 under liquid pressure promotes, by the shape according to guard ring 2 and position rather than with shape and the position of seal ring 1, regulate self-position, during design, should make the compensation rate of the second seal ring 10 of arranging between the concentricity of guard ring 2, valve seat seat ring 3 and seal ring 1 and valve seat seat ring 3 and valve seat 5 match, in order to avoid liquid leaks between valve seat seat ring 3 and valve seat 5.
As shown in Figure 3 and Figure 4; the material of guard ring 2 is preferably flexible material; described guard ring 2 can be mounted in the flexible rings in the guard ring groove 9 arranging on valve seat seat ring 3; the foozle of guard ring 2, flashboard 4 or spheroid 7 can be made up by the distortion of guard ring 2; thereby the processing request of flashboard 4 or spheroid 7 can reduce, be more convenient for manufacturing, and maintenance cost is low; in guard ring 2 wearing and tearing, lose aforementioned to the protective action of valve seat insert after, can only change guard ring 2.
In above scheme, the material of guard ring 2 is teflon or nylon described in recommendations for selection, generally in valve design working pressure, adopts teflon during lower than 300lb; During higher than 300lb, adopt nylon, compare with the seal ring material of common employing, compressive strength is more applicable, and self lubricity is good, moment of torsion in the time of needn't reducing valve switch with lubricant oil, and these two kinds of materials are all highly stable, not can with common pipeline fed sheet of a media generation chemical reaction.
When having specific (special) requirements, the material of guard ring 2 also can be selected rigid, described guard ring 2 can be also with valve seat seat ring 3 one and protrude from valve seat seat ring 3 and flashboard 4 or surperficial lip that spheroid 7 is corresponding, the deformation band of the height of lip and seal ring 1 adapts, now, conventionally should require surface corresponding on described lip position and flashboard 4 or spheroid 7 to carry out Wear-resistant Treatment, the compound one deck abrasion resistance alloy of general selection is as Si Taili, nickel-base alloy or Tungsten carbite etc., also can select comparatively economic electronickelling, to improve working life, but the defect of this kind of mode is valve seat seat ring 3, the processing request of flashboard 4 or spheroid 7 is higher, maintenance cost is higher, after guard ring 2 wearing and tearing, must be by valve seat seat ring 3 integral replacings, corresponding flashboard 4 or spheroid 7 also may need to change, and, between described lip position and flashboard 4 or spheroid 7, it is rigidity friction, the moment of torsion of valve switch will be increased.
As shown in Fig. 5, Fig. 6 and Fig. 7, described pressure equalisation passage 20 is for being arranged on the groove on the surface of contact of guard ring 2 and flashboard 4 or spheroid 7, less on the bulk strength impact of guard ring 2.
In such scheme, the seal ring that further preferred described seal ring 1 is triangular-section, the seat ring groove 6 adaptive with it is dovetail groove, make valve seat 5 stressed more even, the amount of deformation of valve seat 5 while reducing high pressure, seal ring 1 diminishes with the sealing surface area that contacts of flashboard 4 or spheroid 7 simultaneously, thereby has reduced frictional force, makes the switch of valve lighter.
Embodiment one:
As Fig. 3 and Fig. 5, Fig. 6, shown in Fig. 7, plate valve valve base sealing structure of the present invention comprises valve seat seat ring 3, flashboard 4, on the face of valve seat seat ring 3 corresponding to flashboard 4, be provided with seal ring 1 and guard ring 2, the material of guard ring 2 is teflon, the compressive strength of guard ring 2 is higher than the compressive strength of seal ring 1, guard ring 2 is positioned at the inner side of seal ring 1, in the axis of guard ring 2 and described sealing configuration, liquid pressure direction is perpendicular, on the surface of contact of guard ring 2 and flashboard 4, offer the groove that is communicated with outside guard ring inner side and guard ring as pressure equalisation passage 20, pressure equalisation passage 20 is the seal ring of triangular-section for being arranged on seal ring 1 described in guard ring 2, the seat ring groove 6 adaptive with it is dovetail groove.
Embodiment two:
As Fig. 4 and Fig. 6, shown in Fig. 7, ball seat sealing configuration of the present invention comprises valve seat seat ring 3, spheroid 7, on the face of valve seat seat ring 3 corresponding to spheroid 7, be provided with seal ring 1 and guard ring 2, the material of guard ring 2 is teflon, the compressive strength of guard ring 2 is higher than the compressive strength of seal ring 1, guard ring 2 is positioned at the inner side of seal ring 1, in the axis of guard ring 2 and described sealing configuration, liquid pressure direction is perpendicular, on the surface of contact of guard ring 2 and spheroid 7, offer the groove that is communicated with outside guard ring inner side and guard ring as pressure equalisation passage 20, the seal ring that described seal ring 1 is triangular-section, the seat ring groove 6 adaptive with it is dovetail groove.
Claims (5)
1. valve base sealing structure, comprise valve seat seat ring (3), flashboard or spheroid (4, 7), valve seat seat ring (3) is corresponding to flashboard or spheroid (4, 7) on face, be provided with seal ring (1), it is characterized in that: valve seat seat ring (3) is corresponding to flashboard or spheroid (4, 7) on face, be also provided with guard ring (2), the compressive strength of guard ring (2) is higher than the compressive strength of seal ring (1), guard ring (2) is positioned at the inner side of seal ring (1), on guard ring (2), offer the pressure equalisation passage (20) that is communicated with guard ring inner side and guard ring outside, described guard ring (2) is for being arranged on the flexible rings in the guard ring groove (9) arranging on valve seat seat ring (3).
2. valve base sealing structure as claimed in claim 1, is characterized in that: the material of described guard ring (2) is teflon or nylon material.
3. valve base sealing structure as claimed in claim 1, it is characterized in that: described guard ring (2) is for valve seat seat ring (3) one and protrude from valve seat seat ring (3) and flashboard or surperficial lip that spheroid (4,7) is corresponding, and the deformation band of the height of lip and seal ring (1) adapts.
4. the valve base sealing structure as described in claim 1,2 or 3, is characterized in that: described pressure equalisation passage (20) is for being arranged on the groove on the surface of contact of guard ring (2) and flashboard or spheroid (4,7).
5. the valve base sealing structure as described in claim 1,2 or 3, is characterized in that: described seal ring (1) is the seal ring of triangular-section, and the seat ring groove (6) adaptive with it is dovetail groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110444659.2A CN102518823B (en) | 2011-12-27 | 2011-12-27 | Valve seat sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110444659.2A CN102518823B (en) | 2011-12-27 | 2011-12-27 | Valve seat sealing structure |
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| Publication Number | Publication Date |
|---|---|
| CN102518823A CN102518823A (en) | 2012-06-27 |
| CN102518823B true CN102518823B (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110444659.2A Active CN102518823B (en) | 2011-12-27 | 2011-12-27 | Valve seat sealing structure |
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| CN (1) | CN102518823B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758925A (en) * | 2012-07-18 | 2012-10-31 | 嘉士凯（苏州）阀门配件有限公司 | High pressure and low pressure combination gate valve |
| CN103363141B (en) * | 2013-08-02 | 2015-11-11 | 无锡杰尔压缩机有限公司 | A kind of L shape seal arrangement of diamond valve |
| CN104362824A (en) * | 2014-12-06 | 2015-02-18 | 南阳防爆集团股份有限公司 | Low-center high-capacity high-speed positive pressure type high-voltage three-phase asynchronous motor |
| CN105351551A (en) * | 2015-12-03 | 2016-02-24 | 兰州高压阀门有限公司 | Active sealing type valve seat |
| CN113551056B (en) * | 2019-07-10 | 2023-05-23 | 自贡自高阀门有限公司 | Horizontal shaft top-mounted pipe cleaning valve |
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| GB580988A (en) * | 1944-07-07 | 1946-09-26 | Super Oil Seals & Gaskets Ltd | Improvements relating to oil retaining and dirt excluding seals for machinery shafts and bearings |
| EP0053983A1 (en) * | 1980-12-09 | 1982-06-16 | Schlumberger Technology Corporation | Composite ball valve seal assembly |
| CN1989363A (en) * | 2004-07-22 | 2007-06-27 | 萱场工业株式会社 | Seal construction of sliding part |
| CN201057301Y (en) * | 2007-04-27 | 2008-05-07 | 费海鸿 | Angle-relaxing and three-way dual-purpose vacuum ball valve |
| CN201136549Y (en) * | 2007-10-16 | 2008-10-22 | 东风汽车有限公司 | Steering power cylinder of automobile power steering system |
| CN101725732A (en) * | 2008-10-12 | 2010-06-09 | 杨连成 | High-performance soft seal high-pressure ball valve |
| CN202392142U (en) * | 2011-12-27 | 2012-08-22 | 四川精控阀门制造有限公司 | Valve seat sealing structure |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2916284Y (en) * | 2006-06-16 | 2007-06-27 | 天津精通控制仪表技术有限公司 | High performance cage type control valve resistant to high temperature and low temperature |
| CN201028043Y (en) * | 2007-04-08 | 2008-02-27 | 王荣贵 | Wear-resistant metal hard sealing ball valve |
| CN201547276U (en) * | 2009-09-16 | 2010-08-11 | 上海欧特莱阀门机械有限公司 | Seal ring of butterfly valve |
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2011
- 2011-12-27 CN CN201110444659.2A patent/CN102518823B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB580988A (en) * | 1944-07-07 | 1946-09-26 | Super Oil Seals & Gaskets Ltd | Improvements relating to oil retaining and dirt excluding seals for machinery shafts and bearings |
| EP0053983A1 (en) * | 1980-12-09 | 1982-06-16 | Schlumberger Technology Corporation | Composite ball valve seal assembly |
| CN1989363A (en) * | 2004-07-22 | 2007-06-27 | 萱场工业株式会社 | Seal construction of sliding part |
| CN201057301Y (en) * | 2007-04-27 | 2008-05-07 | 费海鸿 | Angle-relaxing and three-way dual-purpose vacuum ball valve |
| CN201136549Y (en) * | 2007-10-16 | 2008-10-22 | 东风汽车有限公司 | Steering power cylinder of automobile power steering system |
| CN101725732A (en) * | 2008-10-12 | 2010-06-09 | 杨连成 | High-performance soft seal high-pressure ball valve |
| CN202392142U (en) * | 2011-12-27 | 2012-08-22 | 四川精控阀门制造有限公司 | Valve seat sealing structure |
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| Publication number | Publication date |
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| CN102518823A (en) | 2012-06-27 |
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