CN101625035A - Valve flap of stop valve - Google Patents
Valve flap of stop valve Download PDFInfo
- Publication number
- CN101625035A CN101625035A CN200810123558A CN200810123558A CN101625035A CN 101625035 A CN101625035 A CN 101625035A CN 200810123558 A CN200810123558 A CN 200810123558A CN 200810123558 A CN200810123558 A CN 200810123558A CN 101625035 A CN101625035 A CN 101625035A
- Authority
- CN
- China
- Prior art keywords
- sealing
- soft
- valve
- hard
- seal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The sealing ring of a valve flap of a stop valve has two forms, namely soft sealing and hard sealing, the soft sealing has better performance than the hard sealing, but a soft sealing material in the closing process is easily extruded inordinately to cause permanent deformation and damage. The invention designs a valve flap provided with soft-hard dual sealing rings by means of the existing mature sealing technology capable of using an O-shaped rubber sealing ring with 100MPa pressure. In the using process, the hard sealing under the condition of closing allowed specific pressure can position the compression ratio of the soft sealing material to work in an allowed compression parameter process environment and not to be damaged by extruding. At the time, the soft sealing not only plays a sealing role of a sealing surface, but also can play a similar role in the sealing application of the O-shaped rubber sealing ring, namely blocks edge leakage gaps between a hard sealing surface and a valve seat sealing surface to prevent leakage. Therefore, the soft sealing is not damaged under the condition of ensuring the sealing property. The soft-hard dual sealing ring technology can be widely applied to high, medium and low pressure and large valves in the future.
Description
Technical field
Patent of the present invention belongs to valve technology category.
Technical background
The closure member of cut-off type valve is a flap.(406 pages) can be recognized from the valve design handbook, the sealing pair of stop valve is meant by flap and valve seat to be formed, and respectively is provided with a seal ring on flap and valve seat, when valve closing, the sealing surface of these two seal rings closely contacts, and stops fluid to circulate in valve.In industrial general iron body valve door, the material of valve seat insert is a metallic material; Seal ring on the flap has two kinds, and the seal ring that a kind of employing has metal material to make is known as hard sealing, and the seal ring that adopts nonmetal elastic material to make is known as soft seal.
Fabrication and processing seals firmly, and will reach airtight leakage technology index for the valve of mesohigh and big latus rectum is a time-consuming precision machining.The hard sealing in use, sealing surface is in case by the solid dielectric damage and failure in the fluid; Perhaps the seal ring of sealing pair is in the installation or use of valve, with being subjected to the stress deformation (even small) that environment factor (being connected power etc. as the variation of serviceability temperature, with pipe fitting) is produced on the valve body integral structure component, just might destroy the flatness of sealing surface, cause valve leak-down rate after closing to exceed standard.If can adopt the soft seal technology, will adopt this unfavorable factor of hard sealing can obtain very big compensation to valve.
The structure of present stop valve soft seal generally is a non-metallic elastic material (as rubber, elastomeric plastics etc.) to be installed as the flap seal ring on valve flap surface.In use, because soft sealing material has plasticity elasticity, with sealing surface of seat under certain ratio press contacts, these that can fill roughness on the sealing surface of seat and irregularity degree between the integral sealing face contacts cause the factor of seal leak, reach airtight leakage technology index easily after making valve closing.But the soft seal material can be aging after using suitable period; Perhaps the accelerated ageing to occurring material after the soft seal material excess compression is in use followed the string and is lost the performance of sealing.
In the valve design technology, possess good sealing property and working life, drawn one group of sealing surface compact specific pressure parameter q in order to make between the valve seal pair
MFThe notion of＜q＜[q],
q
MfEssential specific pressure on the-sealing surface
The specific pressure allowable of [q]-sealing surface
The actual specific pressure (MPa) of q-checking computations sealing surface
To note two keywords at use non-metallic elastic material seal ring: compressibility, compression set (return rate).Material is under compression or the extended state for a long time can produce some permanent deformations, if will produce permanent aging distortion under the supercompression state, loses plasticity elasticity.Therefore, in the specific pressure parameter of the seal ring sealing surface that uses the soft seal valve, should＜specific pressure allowable of the sealing surface of [q].Otherwise, if the specific pressure of seal ring sealing surface is to be in＞to work in the parameter operating mode of [q] for a long time in the valve closing, can quicken promptly that nonmetal elastic seal ring material production is aging to lose return rate, promptly destroy the sealability of front cover close, be prone to the seepage phenomenon after making valve closing.
So that " valve design handbook " the permission specific pressure [q] of table 4-66 seal face materials " provides in the parameter, and [q] of the seal face materials of ebonite is 5 (MPa); And the seal face materials of padding alloy [q] is 250 (MPa).This permission specific pressure differs 50 times.As seen when the valve of design and the soft sealing face of hard sealing surface material same specification kind, the valve driving torque force of design soft seal should be little 50 times than the valve of hard sealing, in order to avoid the excessive power of closing is squeezed soft sealing face bad.
Yet present flap rubber seal is in closing, and its suffered specific pressure is uncontrollable often.Reality is, valve in closing operation, tend to make rubber seal be in the supercompression state until close motionless till, such power of closing can cause soft sealing face specific pressure parameter severe overweight to occur.So long-term, the compression set of rubber seal material strengthens, and quickens material ageing, its result descends decrement, and the contact stress step-down squeezes seal ring bad even, cause seal leakage, this is present soft seal weak point in working life, leakiness, perishable main reason.
In addition, the valve working pressure is higher, required valve closing sealed cover ratio pressure q
MFThe height of also need healing.The specific pressure allowable [q] of the sealing surface that can bear from present existing soft seal material, essential q
MFNow general soft sealing face technology will be much higher than [q], so can only be used the reason in the Low pressure valve series of products.
At present, along with improving constantly of social production efficient, pipeline fluid conveyance conduit latus rectum and bear that pressure also more and more require to maximize, high-pressure trend.But the hard sealing technique of existing stop valve has been difficult to or may have reached hardly the domestic and international seal leak standard of its use for the valve of big latus rectum.For this reason, solve sealing and use seepage problem up to standard, the most effective way is to adopt valve soft seal technology to solve at present.But, how to solve soft seal and all factors that is unfavorable for its working life generally occur in using? how to safeguard in the use that soft seal is in specific pressure allowable [q] use down? soft seal can be used in the high pressure process environments? these are the problems that should solve in the today of adopting the soft seal technology.
At present on the market, the rubber o-ring sealing technique is successfully used in a large number fortunately.The O-ring seals section is installed in general work compressibility in the groove 8～25%, the GB working pressure 100MPa of product, long service life.Therefore,, promptly be expected to solve soft seal and the hard a series of unfavorable factors that in use occurred that seal, the soft seal technology is used in the mesohigh valve if this process engineering can be applied on the sealing pair of stop valve.
Summary of the invention
The present invention designs a kind of stop valve flap, flap is provided with one group of soft or hard double density seal arranged side by side, the seal of this soft or hard double density respectively has the sealing surface of oneself, two sealing surfaces are not on same aspect, soft sealing face exceeds hard sealing surface, the valve seat metal o-ring of itself and stop valve is formed sealing pair, is arranged on hard seal ring sealing surface and soft seal circle sealing surface on the flap, is closing under the permission specific pressure and can do closely contact with the valve seat insert sealing surface simultaneously.
Beneficial effect of the present invention
1. soft or hard double density of the present invention seal is being closed under the essential specific pressure active force, soft, hard sealing surface can be successively with valve seat on the sealing surface compacting of hard seal ring coincide.At this moment, in the hard sealing of closing under the specific pressure effect, soft seal material compressibility can be positioned in the permission compression parameters process environments and use, to guarantee the useful life period of soft seal, soft seal under the state like this, not only can play the seal action of sealing surface, can play the similar effect in sealing applications to rubber o-ring especially, promptly stop up and occur seepage slit, edge between hard sealing surface and the sealing surface of seat to stop the effect of leaking.
2. the soft seal in the soft or hard double density seal flap in regulation and control object and use technology at valve, can be multifarious for selecting material for use.Therefore, flap double density seal soft technique from now in the industrial general valve field, be expected to be widely applied to height, in, in the valve of pressure valve and big latus rectum.
3. the flap of soft or hard double density seal is because what wherein really play seal action is soft seal, so can carry out harsh technical requirements to the leak-down rate of hard sealing.Its meaning is
1. need not to grind by finish turning to only needing in the hard sealing processing and fabricating, make the simple easier of processing technology program change, can save machining period, reduce production costs;
2. adopting the stop valve of hard sealing technique, can cause that valve damages and shortens in valve working life all multifactor, wherein important factor is the deformation of sealing pair sealing surface.The sealing surface distortion all is difficult to avoid for any valve.After this situation occurs, in valve closing, have only to increase and close seal pressure and force the sealing surface deformation quantity to reduce, reach seal leak rate purpose up to standard behind the valve closing as far as possible.Often be to adopt this method in valve operation.But, in case when needing could to reach valve closing leakage rate purpose up to standard, very likely stop valve is produced three kinds of negative consequences working life with the specific pressure allowable [q] that surpasses sealing surface
One: very likely produce damage to the material of two metallic sealing sections of sealing pair this moment, and this can cause the useful life period consequence that reduces valve;
Its two: because the valve rod of stop valve, it is the operation driveshaft of a switch flap still not, or the outer motive sealing Sealing of valve, to the requirement to some extent of stem surface processing precise.In the stop valve design, an important design parameter is a valve closing specific pressure allowable [q] in the valve rod intensity in addition.Therefore, if need to substantially exceed specific pressure allowable [q] with the power of closing, cause the distortion of valve rod curvature thus in valve closing, leaking outside appears in valve rod moves up and down in the valve stem seal of this moment easily, and this also can cause the useful life period consequence that reduces valve;
Its three: very likely can squeeze screw rod on the bad valve rod this moment, makes pitch deformation, thereby reduce the working life of valve.
Yet,, in closing, only need use essential specific pressure q for wherein hard close circle sealing surface for the stop valve that uses soft or hard double density seal flap technology
MFThe power of closing can reach easily under soft seal auxiliary that to close leakage rate up to standard.Thus, all disadvantages that causes thus occur for the hard sealing technique stop valve of above said employing and adopted soft or hard double density seal flap technology, can be readily solved.In addition, even, can change easily in case soft seal uses the later stage occurs agingly.So stop valve will prolong the useful life period of valve greatly in case soft or hard double density seal flap technology is gone up in employing.
This technology tentatively is applied to me and invents in the flap of the vigorous valve of low pressure (a kind of stop valve that is provided with piston actuator and valve positioner) model machine of 10 kilograms of the DN200, the pressure that design and produce.Water pressure testing 1.8MPa 10 minutes, does not have
Description of drawings
Fig. 1 is the stimulate the menstrual flow combination diagram of the soft or hard double-sealing flap of DN200 and valve seat of valve of the present invention
Among the figure: the hard seal ring .3 of 1 flap .2 soft seal circle .4 dovetail groove .5 backup ring .6 valve seat insert.
Fig. 2 is for " being provided with soft seal stop valve sealing pair combination sketch in the valve design handbook " table 4-40 stop valve separated type valve seat construction "
Among the figure: 1 flap .2 flap soft seal circle .3 ring washer .4 valve seat insert.
Fig. 3 is used as the flangeseal diagram for O shape circle
Among the figure: 1 pipeline .2,3 flange plate .4 flanged surfaces contact slit .5O shape ring recess .6O shape circle.
P-hydrodynamic pressure .P
1-install O shape circle pressure .P
mIn-the work O shape is enclosed pressure=P+P
1.
The present invention is further described below in conjunction with Figure of description Fig. 1
Embodiment
Below enumerate the valve seat latus rectum by in the Low pressure valve of DN200 the concrete invention embodiment of employing soft or hard double-sealing technology flap: the soft seal material is a rubber, for realizing imagination, at the plane of flap 1 outer shroud, constitute hard seal ring 2 with built-up welding or with other modes, on 1 of flap, the dovetail groove 4 that rubber sealing circle 3 can be embedded is processed in the inboard of adjacent hard seal ring 2, on 1 of flap, processes backup ring 5 above the inboard of dovetail groove 4;
Above said, the sealing surface of the rubber seal 3 behind the embedding dovetail groove 4, should exceed the sealing surface 1.5～2.5 (mm) of hard seal ring 2, the degree of depth of dovetail groove 4 is about 10.5mm, the backup ring 5 that processes above the said inboard at dovetail groove, it is wide that requirement can be pressed onto rubber seal 3 sealing surface inboards 4.5～5 (mm), depresses the degree of depth 0.5～1 (mm), and the processing diameter of backup ring 5 should be less than the latus rectum 1～1.5 (mm) of valve seat;
Above said soft and hard seal face when valve closing, the sealing surface of hard seal ring 2 should have with the seal ring face of valve seat 6 and is not less than wide the contacting of 3mm, the rubber seal sealing surface should have above wide the contacting of 4mm with the sealing surface of valve seat 6, forms the sealing pair that is provided with soft or hard double density seal technology with this;
Above said backup ring 5 not necessarily will with the whole processing of flap 1, also can independently be processed into seal ring back-up ring plate and come and the flap combination.
Claims (2)
1. the flap of a stop valve, it is characterized in that: meet at flap 1 on the face of valve seat 6, be provided with hard seal ring 2 in the outer part, the inboard of adjacent hard seal ring 2 is provided with the soft seal circle 3 that sealing surface exceeds hard sealing surface, and this have soft or hard double density seal flap 1 and valve seat 6 hard seal rings composition stop valve sealing pairs.
2. hard seal ring 2 as claimed in claim 1, soft seal circle 3, its feature also is: on 1 of flap, the dovetail groove 4 that processes, 3 embeddings of soft seal circle can be installed to wherein, simultaneously, above dovetail groove 4 inboards, process backup ring 5, be pressed on the inner side surface of soft seal circle 3, the processing diameter of backup ring 5 should be less than the latus rectum of valve seat 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810123558A CN101625035A (en) | 2008-07-08 | 2008-07-08 | Valve flap of stop valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810123558A CN101625035A (en) | 2008-07-08 | 2008-07-08 | Valve flap of stop valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101625035A true CN101625035A (en) | 2010-01-13 |
Family
ID=41520974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810123558A Pending CN101625035A (en) | 2008-07-08 | 2008-07-08 | Valve flap of stop valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101625035A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234052A (en) * | 2013-04-26 | 2013-08-07 | 无锡龙山科技有限公司 | Two-position two-way switching valve |
| CN103912708A (en) * | 2013-01-08 | 2014-07-09 | 浙江三花股份有限公司 | Pilot-operated electromagnetic valve and assembling method thereof |
| CN104595576A (en) * | 2015-01-30 | 2015-05-06 | 航天材料及工艺研究所 | Non-metal valve core and molding process thereof |
| CN106051189A (en) * | 2016-08-20 | 2016-10-26 | 王艺澄 | Hydrant seal structure with double sealing |
| CN106321869A (en) * | 2016-08-29 | 2017-01-11 | 张玉莲 | Installing structure of sealing ring |
| CN107300020A (en) * | 2017-07-19 | 2017-10-27 | 武汉武船机电模块有限责任公司 | A kind of electro-hydraulic hull valve |
| CN107314119A (en) * | 2017-07-19 | 2017-11-03 | 武汉武船机电模块有限责任公司 | A kind of hull valve |
| CN108061166A (en) * | 2018-01-18 | 2018-05-22 | 江苏明江阀业有限公司 | A kind of chlorine cutoff valve |
-
2008
- 2008-07-08 CN CN200810123558A patent/CN101625035A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912708A (en) * | 2013-01-08 | 2014-07-09 | 浙江三花股份有限公司 | Pilot-operated electromagnetic valve and assembling method thereof |
| CN103234052A (en) * | 2013-04-26 | 2013-08-07 | 无锡龙山科技有限公司 | Two-position two-way switching valve |
| CN104595576A (en) * | 2015-01-30 | 2015-05-06 | 航天材料及工艺研究所 | Non-metal valve core and molding process thereof |
| CN106051189A (en) * | 2016-08-20 | 2016-10-26 | 王艺澄 | Hydrant seal structure with double sealing |
| CN106321869A (en) * | 2016-08-29 | 2017-01-11 | 张玉莲 | Installing structure of sealing ring |
| CN107300020A (en) * | 2017-07-19 | 2017-10-27 | 武汉武船机电模块有限责任公司 | A kind of electro-hydraulic hull valve |
| CN107314119A (en) * | 2017-07-19 | 2017-11-03 | 武汉武船机电模块有限责任公司 | A kind of hull valve |
| CN108061166A (en) * | 2018-01-18 | 2018-05-22 | 江苏明江阀业有限公司 | A kind of chlorine cutoff valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101625035A (en) | Valve flap of stop valve | |
| CN104213544A (en) | Water stop structure of movable working gate and sealing device | |
| CN205173525U (en) | Submarine pipeline pair gate valve | |
| CN2926698Y (en) | Fixed membrane metal sealed spherical valve | |
| CN202082393U (en) | High-airtightness seal ring | |
| CN203627876U (en) | Forging type high pressure difference noise reduction V-shaped adjusting ball valve | |
| CN201884786U (en) | Two-way cartridge inserted valve | |
| CN204828655U (en) | Multistage sealed graphite gaskets | |
| CN2163912Y (en) | Two-way high-temp metallic packing butterfly valve | |
| CN201934780U (en) | Modified filler pressing sleeve device | |
| CN103711935A (en) | Valve seat structure of track ball valve | |
| CN201787061U (en) | Piston sealing on arc sealing surface of L-shaped support ring | |
| CN207178723U (en) | A kind of floating type hard sealing structure in metal valve | |
| CN202091540U (en) | Self-compensating superhard, wear resistant, high-pressure resistant and high-temperature resistant metal rigid-sealing ball valve | |
| CN202032103U (en) | Novel butterfly valve | |
| CN206461467U (en) | A kind of sand control piston for oil immersion line motor | |
| CN205715662U (en) | Graphite metal complex sealing ring | |
| CN205190736U (en) | Many times way metal seal gaskets | |
| CN219655248U (en) | Special-shaped middle cavity sealing ring for soft sealing gate valve | |
| CN204083347U (en) | The nonmetal sealing configuration of ball valve elastic compensating | |
| CN207145719U (en) | A kind of improved structure of metal valve body | |
| CN213393655U (en) | Novel soft and hard sealing ball valve | |
| CN202867913U (en) | Valve seat structure of track ball valve | |
| CN201795045U (en) | Piston seal for trapezoidal sealing face of rectangular supporting ring | |
| CN218935470U (en) | Tandem double-packing dynamic seal ultrahigh-pressure plate valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100113 |