CN201757217U - Valve stem high-temperature sealing device - Google Patents
Valve stem high-temperature sealing device Download PDFInfo
- Publication number
- CN201757217U CN201757217U CN2010202614842U CN201020261484U CN201757217U CN 201757217 U CN201757217 U CN 201757217U CN 2010202614842 U CN2010202614842 U CN 2010202614842U CN 201020261484 U CN201020261484 U CN 201020261484U CN 201757217 U CN201757217 U CN 201757217U
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Abstract
The utility model discloses a valve stem high-temperature sealing device, which consists of two metal rings, two flexible graphite seal rings and sealing grease. The two metal rings are formed by densely winding and pressing fine metal wires, the metal rings are integrally sintered with the flexible graphite seal rings via die pressing, the flexible graphite seal rings are arranged between the two metal rings, and the sealing grease is filled between the two flexible graphite seal rings. The valve stem high-temperature sealing device is smaller in friction coefficient so that switching torque of a valve is lower.
Description
Technical field
The utility model relates to a kind of seal arrangement, particularly a kind of valve rod elevated-temperature seal device, and valve rod elevated-temperature seal device is to be used for sealed valve stem, can be widely used in the valve stem seal of the high temperature high pressure valve such as exploitation, chemical industry of viscous crude and geothermal resources.
Background technique
At present, the valve stem seal material of Chang Yong high-temperature high pressure valve is establishment filler band, graphite circle, asbestos, fluorine rubber etc.Because there is the not high shortcoming of troublesome poeration, sealing load at the scene in establishment filler band, market has begun atrophy; Fluorine rubber also has certain narrow limitation at high temperature resistant, low temperature, aspect such as corrosion-resistant; It is good that asbestos are high temperature resistant, but bigger to the harm of human body, now withdrawed from the market of high temperature filler; The graphite circle is because the chemical property of graphite is more stable, aspect corrosion-resistant, high-low temperature resistant, has fine performance, but present most of filler relies on bolt to compress, seal ring is out of shape realizes sealing, therefore, it is big that the pretightening force of gasket seal is wanted, and makes that the switch moment of valve is very high, the operation effort.
The model utility content
Technical problem to be solved in the utility model provides a kind of valve rod elevated-temperature seal device, and its friction factor is very little, makes that the switch moment of valve is also very little.
For solveing the technical problem, the utility model provides a kind of valve rod elevated-temperature seal device, it is characterized in that, it is made up of two metal rings, two Expanded graphite seal rings and seal gease, metal ring and Expanded graphite seal ring are in aggregates by molding sintering, the Expanded graphite seal ring is between two metal rings, and seal gease is between two Expanded graphite seal rings.
Preferably, described Expanded graphite seal ring be shaped as V-arrangement, the surface of contact of metal ring and Expanded graphite seal ring is also V-shaped.
Preferably, described Expanded graphite seal ring has two V-arrangement openings, and two V-arrangement openings are installed relatively.
Positive progressive effect of the present utility model is: because the seal gease that valve rod elevated-temperature seal device uses belongs to elevated-temperature seal fat, can satisfy the worst hot case condition, the Expanded graphite seal ring adopts resistant to elevated temperatures material, metal ring forms around compacting by fine wire is close, expansion coefficient is little, rather than the bulk metal ring makes, and because of thermal expansion makes between metal ring and the valve rod stuck phenomenon takes place when having solved little Spielpassung.Because valve rod elevated-temperature seal device adopts the mode of dynamic seal (packing), high pressure conditions relies on the medium power in the valve pocket to realize, do not need very high filler pretightening force, seal gease in the middle of the filler is a liquid, Expanded graphite is again good dry lubricant, and therefore, the friction factor of valve rod elevated-temperature seal device is very little, make that the switch moment of valve is also very little, also solved the defective of the stuck valve rod of high-temperature situation lower stem seal filler simultaneously.
Description of drawings
Fig. 1 is the structural representation of the utility model valve rod elevated-temperature seal device.
Fig. 2 is the fundamental diagram of the utility model valve rod elevated-temperature seal device.
Embodiment
Lift a preferred embodiment below, and come the clearer the utility model that intactly illustrates in conjunction with the accompanying drawings.
As shown in Figure 1, the utility model valve rod elevated-temperature seal device is made up of two metal rings 1, two Expanded graphite seal rings 2 and seal gease 3, metal ring 1 is in aggregates by molding sintering with Expanded graphite seal ring 2, Expanded graphite seal ring 2 is between two metal rings 1, being shaped as V-arrangement and having two V-arrangement openings of Expanded graphite seal ring 2, two V-arrangement openings are installed relatively; Seal gease 3 belongs to elevated-temperature seal fat, can satisfy the worst hot case condition; During installation, the V-arrangement opening of two Expanded graphite seal rings 2 is relative, and seal gease 3 is between two Expanded graphite seal rings 2; Metal ring 1 forms around compacting by fine wire is close.
The working state of the utility model valve rod elevated-temperature seal device is seen Fig. 2, and the gap is very little between the internal diameter of the external diameter of valve rod 4 and metal ring 1, the internal diameter of Expanded graphite seal ring 2; Gap between the external diameter of the external diameter of the internal diameter of stuffing box 5 and metal ring 1, Expanded graphite seal ring 2 is also very little, during assembling, be in little Spielpassung state, and because seal gease 3 is a mud shape material, the gap between the internal diameter of seal gease 3 filling metal rings 1 and the interior external diameter of Expanded graphite seal ring 2.After valve was roll-outed, Gland 6 was fixed.In stuffing box 5, inject a certain amount of elevated-temperature seal fat by seal gease injection valve 7, the V-arrangement opening of two Expanded graphite seal rings 2 is slightly opened, the outer surface of V-arrangement opening and valve rod 4, fit, thereby form certain pressure seal zone in the relative annular region of the V-arrangement opening of two Expanded graphite seal rings 2 with the internal surface of stuffing box 5.
In low-pressure, because the internal surface of the V-arrangement opening of Expanded graphite seal ring 2 and the outer surface of valve rod 4, stuffing box 5 is fitted, medium in the valve pocket can not be from the outside seepage of gap location between the internal diameter of the internal diameter of the external diameter of valve rod 4 and metal ring 1, Expanded graphite seal ring 2, medium can not be from the outside seepage of gap location between the external diameter of the external diameter of stuffing box 5 and metal ring 1 and Expanded graphite seal ring 2, thereby sets up low pressure seal.
In high pressure, the pressure in the valve pocket is higher than the pressure of the relative annular region of the V-arrangement opening of two Expanded graphite seal rings 2, and the medium in the valve pocket can promote stuffing box 5.The metal ring 1 of bottom moves up, because Gland 6 is fixed, metal ring 1 that contacts with Gland 6 and Expanded graphite seal ring 2 also are fixed, can cause the relative annular region space of V-arrangement opening of two Expanded graphite seal rings 2 to reduce like this, pressure raises, seal gease 3 makes the V-arrangement opening of Expanded graphite seal ring 2 become big, the internal diameter of the external diameter of V-arrangement opening and valve rod 4, stuffing box 5 fits tightly, form higher pressure seal zone, block the passage that the medium in the valve pocket leaks, thereby realized high pressure sealing.
In the process of high pressure sealing, the pressure of the annular region that the V-arrangement opening of two Expanded graphite seal rings 2 is relative is with the change in pressure of valve pocket, the pressure of the annular region that the pressure of valve pocket is relative with the V-arrangement opening of two Expanded graphite seal rings 2 all the time balances each other with the pressure in the valve pocket, therefore, this kind seal form belongs to a kind of dynamic seal (packing) form.
The seal gease that valve rod elevated-temperature seal device uses is an elevated-temperature seal fat, can satisfy the worst hot case condition, Expanded graphite seal ring 2 adopts resistant to elevated temperatures material, metal ring 1 forms around compacting by fine wire is close, expansion coefficient is little, rather than the bulk metal ring makes, and because of thermal expansion makes between metal ring 1 and the valve rod 4 stuck phenomenon takes place when having solved little Spielpassung.
Because valve rod elevated-temperature seal device adopts the mode of dynamic seal (packing), high pressure conditions relies on the medium power in the valve pocket to realize, do not need very high filler pretightening force, seal gease in the middle of the filler is a liquid, Expanded graphite is again good dry lubricant, and therefore, the friction factor of valve rod elevated-temperature seal device is very little, the switch moment of valve is also very little, has also solved the defective of the stuck valve rod of high-temperature situation lower stem seal filler simultaneously.
Valve rod elevated-temperature seal device can pass through seal gease injection valve 7 after-teeming seal gease 3 in stuffing box 5 after long-term the use, seal gease 3 is set up new pressure balance with the medium in the valve pocket, improves sealability.
Though more than described embodiment of the present utility model, but those skilled in the art is to be understood that, these only illustrate, and under the prerequisite that does not deviate from principle of the present utility model and essence, can make numerous variations or modification to these mode of executions.Therefore, protection domain of the present utility model is limited by appended claims.
Claims (3)
1. valve rod elevated-temperature seal device, it is characterized in that, it is made up of the close metal ring that forms around compacting of two fine metal mesh, two Expanded graphite seal rings and seal gease, metal ring and Expanded graphite seal ring are in aggregates by molding sintering, the Expanded graphite seal ring is between two metal rings, and seal gease is between two Expanded graphite seal rings.
2. valve rod elevated-temperature seal device as claimed in claim 1 is characterized in that, described Expanded graphite seal ring be shaped as V-arrangement, the surface of contact of metal ring and Expanded graphite seal ring is also V-shaped.
3. valve rod elevated-temperature seal device as claimed in claim 1 is characterized in that described Expanded graphite seal ring has two V-arrangement openings, and two V-arrangement openings are installed relatively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202614842U CN201757217U (en) | 2010-07-16 | 2010-07-16 | Valve stem high-temperature sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202614842U CN201757217U (en) | 2010-07-16 | 2010-07-16 | Valve stem high-temperature sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201757217U true CN201757217U (en) | 2011-03-09 |
Family
ID=43644489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202614842U Expired - Lifetime CN201757217U (en) | 2010-07-16 | 2010-07-16 | Valve stem high-temperature sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201757217U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523785A (en) * | 2016-11-25 | 2017-03-22 | 南通龙源电站阀门有限公司 | V-shaped structure valve rod sealing padding |
| CN107654646A (en) * | 2017-11-03 | 2018-02-02 | 苏州优力克流体控制科技有限公司 | A kind of flexible metal back-up ring for sealing ring |
| CN116826627A (en) * | 2022-12-12 | 2023-09-29 | 上海百若试验仪器有限公司 | Ultra-high pressure container wire penetrating piece |
-
2010
- 2010-07-16 CN CN2010202614842U patent/CN201757217U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523785A (en) * | 2016-11-25 | 2017-03-22 | 南通龙源电站阀门有限公司 | V-shaped structure valve rod sealing padding |
| CN107654646A (en) * | 2017-11-03 | 2018-02-02 | 苏州优力克流体控制科技有限公司 | A kind of flexible metal back-up ring for sealing ring |
| CN116826627A (en) * | 2022-12-12 | 2023-09-29 | 上海百若试验仪器有限公司 | Ultra-high pressure container wire penetrating piece |
| CN116826627B (en) * | 2022-12-12 | 2024-01-09 | 上海百若试验仪器有限公司 | Ultra-high pressure container wire penetrating piece |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110309 |
|
| CX01 | Expiry of patent term |