CN1460806A - High-temp. high-pressure valve rod active seal mechanism and gate valve adopting said seal mechanism - Google Patents
High-temp. high-pressure valve rod active seal mechanism and gate valve adopting said seal mechanism Download PDFInfo
- Publication number
- CN1460806A CN1460806A CN 03145406 CN03145406A CN1460806A CN 1460806 A CN1460806 A CN 1460806A CN 03145406 CN03145406 CN 03145406 CN 03145406 A CN03145406 A CN 03145406A CN 1460806 A CN1460806 A CN 1460806A
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- valve
- stuffing box
- valve rod
- gland nut
- sealing
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Abstract
The present invention relates to a high-temp. high-pressure valve rod action sealing mechanism and a gate valve made up by adopting said sealing mechanism. The valve cover of said sealing mechanism has the packing chamber whose opening is directed towards the internal cavity of the valve body, in the packing chamber there are successively placed several layers of packing material, packing pad and packing nut from top to bottom, the valve rod can be passed through the valve rod hole of the centre of said mechanism, on end is connected with gate board and its another end of is connected with hand wheel, the packing material and packing pad are tightly combined together by means of packing nut.
Description
Technical field
The present invention relates to a kind of valve stem seal mechanism of valve, particularly be suitable for the valve stem seal mechanism of gate valve rod sealing under the High Temperature High Pressure and the gate valve that adopts this sealing mechanism.
Background technique
Gate valve and other block valve are mainly used to block or connect the flowing medium in the pipeline, the forced seal technology is adopted in sealing between the same valve body of valve rod (or valve gap) of existing this class valve, its sealing mechanism mainly comprises valve gap, parts such as filler and gland, wherein said valve gap is provided with the stuffing box that opening makes progress, described filler is positioned at this stuffing box, described gland is pressed in filler top, described valve gap, the centre of filler and gland is equipped with the hole, described each hole is interconnected to the valve rod hole of this mechanism, the valve rod of valve passes described valve rod hole, one end connects the power units such as flashboard of body cavity, the other end is positioned at valve body and connects turn parts such as handwheel outward, pressing plate is pressed down gland, promptly produce to filler axially (with the valve rod is reference, pressure down together), make the filler compressive deformation, generation is to the lateral extrusion power of valve rod and valve gap, realize between valve gap and the filler, sealing between filler and the valve rod, thus the space between valve rod and the valve gap is sealed up, stop the flowing medium in the body cavity in the valve opening process and under the closed condition, between valve rod and valve gap, to release.The defective of this sealing mechanism is that filler is adjusted under the normal temperature normality in advance to the lateral extrusion power of valve rod and valve gap, but the flowing medium when using in the body cavity might be in high-temperature high-pressure state, when the valve body temperature surpasses the creep temperature of valve body steel, the parts that comprise valve gap on the valve can produce distortion inevitably, cause the increase of stuffing box radial dimension, because filler generally adopts graphite to make, its distortion is much smaller with respect to the valve gap of steel etc., its amount of deformation (or deformational stress) is not enough to remedy the influence of the amount of deformation (or deformational stress) of valve gap, cause filler that valve rod and valve gap lateral extrusion power are reduced, seal pressure descends, cause sealing effect to reduce, filler is subjected to the pressure medium effect also can produce the axial force of offsetting gland pretension axial pressure on the other hand, sealing effect is further descended, the result of these two kinds of effects destroys the required remaining impacting force of sealing probably fully, causes the sealing failure, and medium is revealed.
Summary of the invention
For overcoming the defectives that the block valve valve rod is bad at the High Temperature High Pressure lower seal, medium is easy to reveal such as having gate valve now, the invention provides initiatively sealing mechanism of a kind of High Temperature High Pressure valve rod, and provide a kind of gate valve that adopts this sealing mechanism, this sealing mechanism adopts initiatively sealing means, improved the sealing effect of High Temperature High Pressure lower valve rod, the phenomenon that medium is revealed from the valve rod limit can not appear in the gate valve of this valve stem seal of employing mechanism under High Temperature High Pressure.
The technological scheme that the present invention solves above-mentioned technical problem of the prior art is: High Temperature High Pressure valve rod initiatively sealing mechanism comprises valve gap, described valve gap is provided with the stuffing box to the body cavity opening, be provided with several layers filler, Packing seat and the gland nut that is pressed on together in this stuffing box from top to bottom successively, the centre of described valve gap, filler, Packing seat and gland nut is equipped with the hole, and these holes are interconnected to the valve rod hole of this mechanism.
It is waney discoid up and down that described Packing seat can be, and wherein lower diameter is greater than upper diameter, and it is waney cylindric up and down that described stuffing box can be, and its top and the bottom diameter is corresponding with described Packing seat top and the bottom diameter respectively.
Described gland nut can be provided with some axial holes, and its upper surface can also be provided with the circular trough that connects with described through hole.
Described gland nut side can be provided with screw thread, and connects with described stuffing box sidewall thread by this screw thread.
Described valve gap stuffing box opening can be provided with sealing seat.
Gate valve provided by the invention comprises the valve body and the above-mentioned valve stem seal mechanism of valve rod, upper opening, the bonnet lower of wherein said sealing mechanism is inserted body cavity from described valve body openings, its sidewall joins with valve interior wall, described valve rod passes the valve rod hole of described sealing mechanism, one end connects the flashboard in the body cavity, and the other end is positioned at valve body and connects handwheel outward.
The working principle of this valve stem seal mechanism provided by the invention under High Temperature High Pressure is: during the valve assembling, screw gland nut, make the filler compressive deformation in the stuffing box, form the required pretension specific pressure of sealing, when being used for high-temperature high-pressure medium, under high temperature action, the distortion of valve gap stuffing box is identical and synchronous with the deformation direction of Packing seat and gland nut, can not have a negative impact to the pretension specific pressure, pressure medium affacts the Packing seat lower end surface by through hole on the gland nut and circular trough, and Packing seat upwards pressed, the amount of deformation or the distortional stress of filler are increased, improved sealing effect, and the big down little structural type of Packing seat makes its pressure that is applied to the filler lower end surface greater than the pressure of medium to its lower end surface, helps the raising of sealing effect.
Because the stuffing box that the present invention is provided with on valve gap adopts the form to the body cavity opening, and be provided with the gland nut and the Packing seat of special construction, each part distortion that high temperature is caused does not influence sealing effect, eliminated the phenomenon that the sealing effect that high temperature causes under the prior art descends, particularly under high-pressure medium, also reliable medium pressure automatically improves seal pressure, produces better sealing effect, has realized the excellent sealing between High Temperature High Pressure lower valve rod and the valve body.
Description of drawings
The structural representation of Fig. 1 valve stem seal provided by the invention mechanism and gate valve relevant portion.
Embodiment
Referring to Fig. 1, High Temperature High Pressure valve rod provided by the invention initiatively sealing mechanism comprises valve gap 9, described valve gap 9 is provided with the stuffing box to the body cavity opening, be provided with the several layers filler 8, Packing seat 2 and the gland nut 4 that are pressed on together in this stuffing box from top to bottom successively, the centre of described valve gap 9, filler 8, Packing seat 2 and gland nut 4 is equipped with the hole, and these holes are interconnected to the valve rod hole of this mechanism.
It is waney discoid up and down that described Packing seat 2 can be, and its underpart diameter is greater than upper diameter, and it is waney cylindric up and down that described stuffing box can be, and its top and the bottom diameter is corresponding with described Packing seat top and the bottom diameter respectively.
Described gland nut 4 can be provided with some axial holes 7, and its upper surface can also be provided with the circular trough that connects with described through hole.
Described gland nut 4 sides can be provided with screw thread, and connect with described stuffing box sidewall thread by this screw thread.
Described valve gap stuffing box opening can be provided with sealing seat 5, and sealing seat 5 also can adopt engage thread to connect with the stuffing box sidewall.
Gate valve provided by the invention comprises valve rod 1, the valve body 3 of upper opening and valve gap 9, wherein said bonnet lower 6 is inserted body cavity from described valve body 3 openings, its sidewall joins with valve interior wall, described valve gap 9 also is provided with the stuffing box to the body cavity opening, be provided with the several layers filler 8 that is pressed on together in this stuffing box from top to bottom successively, Packing seat 2 and gland nut 4, described valve gap 9, filler 8, the centre of Packing seat 2 and gland nut 4 is equipped with the hole, these holes are interconnected to constitute valve rod hole, described valve rod 1 passes described valve rod hole, one end connects the flashboard in the body cavity, and the other end is positioned at valve body and connects handwheel outward.
It is waney discoid up and down that described Packing seat 2 can be, and its underpart diameter is greater than upper diameter, and it is waney cylindric up and down that described stuffing box can be, and its top and the bottom diameter is corresponding with described Packing seat top and the bottom diameter respectively.
Described gland nut 4 can be provided with some axial holes 7, and its upper surface can also be provided with the circular trough that connects with described through hole.
Described gland nut 4 sides can be provided with screw thread, and connect with described stuffing box sidewall thread by this screw thread.
Described valve gap stuffing box opening can be provided with sealing seat 5, and sealing seat 5 also can adopt engage thread to connect with the stuffing box sidewall.
High Temperature High Pressure valve stem seal provided by the invention mechanism can also be used for sealing and other sealings between other various ways valves or similar motion bar and the fixed wall.
Claims (10)
1. High Temperature High Pressure valve rod sealing mechanism initiatively, comprise valve gap, it is characterized in that described valve gap is provided with the stuffing box to the body cavity opening, be provided with several layers filler, Packing seat and the gland nut that is pressed on together in this stuffing box from top to bottom successively, the centre of described valve gap, filler, Packing seat and gland nut is equipped with the hole, and these holes are interconnected to the valve rod hole of this mechanism.
2. High Temperature High Pressure valve rod as claimed in claim 1 is sealing mechanism initiatively, it is characterized in that described Packing seat is waney discoid up and down, its underpart diameter is greater than upper diameter, it is waney cylindric up and down that described stuffing box is, and its top and the bottom diameter is corresponding with described Packing seat top and the bottom diameter respectively.
3. High Temperature High Pressure valve rod as claimed in claim 1 or 2 is sealing mechanism initiatively, it is characterized in that described gland nut is provided with some axial holes, and its upper surface also is provided with the circular trough that connects with described through hole.
4. High Temperature High Pressure valve rod as claimed in claim 3 is sealing mechanism initiatively, it is characterized in that described gland nut side is provided with screw thread, and connects with described stuffing box sidewall thread by this screw thread.
5. High Temperature High Pressure valve rod as claimed in claim 4 is sealing mechanism initiatively, it is characterized in that described valve gap stuffing box opening is provided with sealing seat, and the sealing seat adopts engage thread to connect with the stuffing box sidewall.
6. gate valve, comprise valve rod, the valve body of upper opening and valve gap, it is characterized in that described bonnet lower is from described valve body openings insertion body cavity, its sidewall joins with valve interior wall, described valve gap also is provided with the stuffing box to the body cavity opening, be provided with the several layers filler that is pressed on together in this stuffing box from top to bottom successively, Packing seat and gland nut, described valve gap, filler, the centre of Packing seat and gland nut is equipped with the hole, these holes are interconnected to constitute valve rod hole, described valve rod passes described valve rod hole, one end connects the flashboard in the body cavity, and the other end is positioned at valve body and connects handwheel outward.
7. gate valve as claimed in claim 6, it is characterized in that described Packing seat is waney discoid up and down, its underpart diameter is greater than upper diameter, and it is waney cylindric up and down that described stuffing box is, and its top and the bottom diameter is corresponding with described Packing seat top and the bottom diameter respectively.
8. as claim 6 or 7 described gate valves, it is characterized in that described gland nut is provided with some axial holes, its upper surface also is provided with the circular trough that connects with described through hole.
9. gate valve as claimed in claim 8 is characterized in that described gland nut side is provided with screw thread, and connects with described stuffing box sidewall thread by this screw thread.
10. gate valve as claimed in claim 9 is characterized in that described valve gap stuffing box opening is provided with sealing seat, and the sealing seat adopts engage thread to connect with the stuffing box sidewall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031454062A CN1186550C (en) | 2003-06-12 | 2003-06-12 | High-temp. high-pressure valve rod active seal mechanism and gate valve adopting said seal mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031454062A CN1186550C (en) | 2003-06-12 | 2003-06-12 | High-temp. high-pressure valve rod active seal mechanism and gate valve adopting said seal mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1460806A true CN1460806A (en) | 2003-12-10 |
| CN1186550C CN1186550C (en) | 2005-01-26 |
Family
ID=29591383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031454062A Expired - Fee Related CN1186550C (en) | 2003-06-12 | 2003-06-12 | High-temp. high-pressure valve rod active seal mechanism and gate valve adopting said seal mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1186550C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287539A (en) * | 2011-07-24 | 2011-12-21 | 李厚志 | Actively-sealed butterfly valve |
| CN110762284A (en) * | 2019-10-31 | 2020-02-07 | 湖北航天技术研究院总体设计所 | High-temperature high-pressure reciprocating shaft sealing gas valve |
| CN114440000A (en) * | 2021-12-24 | 2022-05-06 | 合肥通用机械研究院有限公司 | Composite packing sealing system for ultrahigh-pressure hydrogen energy valve |
-
2003
- 2003-06-12 CN CNB031454062A patent/CN1186550C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287539A (en) * | 2011-07-24 | 2011-12-21 | 李厚志 | Actively-sealed butterfly valve |
| CN110762284A (en) * | 2019-10-31 | 2020-02-07 | 湖北航天技术研究院总体设计所 | High-temperature high-pressure reciprocating shaft sealing gas valve |
| CN110762284B (en) * | 2019-10-31 | 2021-08-03 | 湖北航天技术研究院总体设计所 | High-temperature high-pressure reciprocating shaft sealing gas valve |
| CN114440000A (en) * | 2021-12-24 | 2022-05-06 | 合肥通用机械研究院有限公司 | Composite packing sealing system for ultrahigh-pressure hydrogen energy valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1186550C (en) | 2005-01-26 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050126 Termination date: 20170612 |