CN201137750Y - Multi-layer sealed valve rod control valve - Google Patents
Multi-layer sealed valve rod control valve Download PDFInfo
- Publication number
- CN201137750Y CN201137750Y CNU2007200828351U CN200720082835U CN201137750Y CN 201137750 Y CN201137750 Y CN 201137750Y CN U2007200828351 U CNU2007200828351 U CN U2007200828351U CN 200720082835 U CN200720082835 U CN 200720082835U CN 201137750 Y CN201137750 Y CN 201137750Y
- Authority
- CN
- China
- Prior art keywords
- valve
- guide pipe
- control valve
- valve rod
- valve gap
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a control valve of a multilevel sealing valve rod. The control valve comprises a valve bonnet and a valve rod which moves in the valve bonnet, wherein ring-shaped sealing grooves are also arranged between the valve bonnet and the valve rod, sealing filler is filled in the ring-shaped sealing grooves, the ring-shaped sealing grooves are at least two and are respectively arranged on two ends in the valve bonnet, and an insulating sleeve is arranged between the ring-shaped sealing grooves. The control valve adopts the multilevel sealing valve rod, the sealing performance and the reliability are extremely good, and the service life of the control valve is improved.
Description
Technical field
The utility model relates to a kind of control valve that is used for automatic control system, relates in particular to a kind of control valve of multi-level sealed valve stem.
Background technique
Control valve is a very important final element in the automatic control system, and the regulated fluid flow overcomes interference and guarantees that controlled variable reaches given craft index.The valve portion of control valve is made up of the internals and the valve body of valve, and the internals of valve comprise spool, valve seat, valve rod, stuffing box and valve gap etc.Valve gap and stuffing box are used for leading to valve stem seal with to valve rod, prevent processing medium along this movable member of valve rod of control valve to external leakage, it is the valve body inalienable part.
Select control valve, except valve body structure, material, actuator, bore calculate, also should be according to the character of the pressure of controlling fluid, temperature, pressure reduction, fluid, the structural type of choose reasonable valve gap and stuffing box, in case the fluid stopping body leaks out along the control valve valve rod, promptly should take into full account the performance and the working life of valve stem seal.Conventional valve cover structure form generally has four kinds: plain edition, fin type, long-neck type and sylphon seal type.Material generally has cast iron, cast steel and stainless steel, and stuffing box is generally teflon or Expanded graphite.
The valve gap of traditional control valve valve gap valve rod leak-proof structure is by making with the material of valve body identical materials or equivalence.Valve gap bears temperature identical with valve body and corrosive effects, valve stem seal adopts the teflon or the Expanded graphite of individual layer upper end one-part form to seal, disturbance can appear in the valve rod knee-action process, can produce sharp wear to filler, in engineering was used, hydrodynamic pressure also can cause sealing wear, the frictional force of control valve can increase and is easy to make valve stem seal to lose efficacy like this, generation leaks outside and causes environmental pollution, causes the control valve dead band to increase, and regulates sensitivity and reduces greatly.What the sealing configuration tradition of deep-etching, volatile, poisonous and hazardous medium was adopted is sylphon seal type form, in case bellows bursts is with the serious consequence that produces.In engineering reality, the sylphon seal form will consider that also the rating value of the pressure of sylphon seal can not have the particle of solid to exist with the increasing and reduce of temperature in the fluid, and the longest do action life-span of bellows material etc.In the place of the deep-etching of some processing mediums corrosion, during for wet chlorine, the micro-hydrochloric acid that contains in the wet chlorine can make corrugated stainless steel tubing be corroded very soon as processing medium, and then the control valve valve rod can not adopt the form of sylphon seal.
Summary of the invention
The valve gap valve rod leak-proof structure that the purpose of this utility model is the to solve existing control valve problem that leaks outside provides a kind of control valve of multi-level sealed valve stem.The utility model adopts multi-level sealed valve stem, and sealing and reliability are splendid, has improved the working life of control valve.
For achieving the above object, the technical solution adopted in the utility model is as follows:
A kind of control valve of multi-level sealed valve stem, comprise valve gap and the valve rod of activity in valve gap, it is characterized in that: also be provided with annular seal groove between described valve gap and the valve rod, be filled with stuffing box packing in the annular seal groove, described annular seal groove is at least two, two ends about being separately positioned in the valve gap are provided with disrance sleeve between the annular seal groove.
Also be provided with guide pipe and following guide pipe between described valve gap and the valve rod, the described guide pipe of going up is arranged on the valve gap top, and following guide pipe is arranged on the valve gap bottom, and seal groove is arranged between guide pipe and the disrance sleeve.
Also be provided with the guide pipe lining between described guide pipe and the valve rod.
Adopt advantage of the present utility model to be:
One, at least two seal grooves of the utility model setting adopt multi-level sealing configuration, and sealability is splendid.
Two, the utility model is provided with guide pipe and following guide pipe in valve gap bottom and top, makes valve rod can not produce disturbance in the process of moving up and down, and has reduced the wearing and tearing to stuffing box packing, and has had the positioning and guiding effect.
Three, be provided with disrance sleeve between the utility model annular seal groove, the stuffing box packing at valve gap two ends is played a supportive role, can clean the medium that in movement process, is attached on the valve rod, make valve stem seal tight, not the situation that can occur leaking outside.
Four, the utility model has solved the valve gap valve stem seal poor effect of existing control valve, the problem that easily leaks outside, the working life of having improved control valve.
Five, the utility model can substitute the applying working condition requirement of sylphon seal fully, has greatly reduced the working service cost, has improved the reliability and the working life of sealing.
Description of drawings
Fig. 1 is the utility model valve gap valve rod leak-proof structure schematic representation
Be labeled as among the figure: 1, valve gap, 2, valve rod, 3, stuffing box packing, 4, disrance sleeve, 5, go up guide pipe, 6, guide pipe down, 7, the guide pipe lining, 8, pressing plate.
Embodiment
A kind of control valve of multi-level sealed valve stem, comprise valve gap 1 and the valve rod 2 of activity in valve gap 1, also be provided with annular seal groove between described valve gap 1 and the valve rod 2, be filled with stuffing box packing 3 in the annular seal groove, described annular seal groove is at least two, be separately positioned on two ends in the valve gap, be provided with disrance sleeve 4 between the annular seal groove.In the utility model, also be provided with guide pipe 5 and following guide pipe 6 between valve gap 1 and the valve rod 2, last guide pipe 5 is arranged on valve gap 1 top, following guide pipe 6 is arranged on valve gap 1 bottom, seal groove is arranged between guide pipe and the disrance sleeve 4, also be provided with guide pipe lining 7 between guide pipe and the valve rod 2, last guide pipe 5 cooperates fixing with pressing plate 8.
During use, between disrance sleeve 4 and valve rod 2, feed the inert gas such as the nitrogen of processing medium pressure in a little higher than disrance sleeve 4, helium or air, make the packing seal of control valve destroyed, because the pressure of gas is wanted the maximum pressure of processing medium in a little higher than pipeline, deep-etching, volatile, poisonous and hazardous medium also can't leak out.Can substitute the applying working condition requirement of sylphon seal fully, greatly reduce the working service cost, improve the reliability and the working life of sealing!
At least two seal grooves of the utility model setting, adopt multi-level sealing configuration, sealability is splendid, be provided with guide pipe and following guide pipe in valve gap bottom and top, make valve rod in the process of moving up and down, can not produce disturbance, wearing and tearing have been reduced to stuffing box packing, and have the positioning and guiding effect, be provided with disrance sleeve between the annular seal groove, the stuffing box packing at valve gap two ends is played a supportive role, can clean the medium that in movement process, is attached on the valve rod, make valve stem seal tight, the situation that can occur leaking outside has not solved the valve gap valve stem seal poor effect of existing control valve, the problem that easily leaks outside, the working life of having improved control valve.
Obviously; those of ordinary skill in the art is according to technological know-how of being grasped and customary means; according to above said content, can also make the various ways that does not break away from the utility model basic fundamental thought, these pro forma conversion are all within protection domain of the present utility model.
Claims (3)
1, a kind of control valve of multi-level sealed valve stem, comprise valve gap (1) and the valve rod (2) of activity in valve gap (1), it is characterized in that: also be provided with annular seal groove between described valve gap (1) and the valve rod (2), be filled with stuffing box packing (3) in the annular seal groove, described annular seal groove is at least two, be separately positioned on two ends in the valve gap, be provided with disrance sleeve (4) between the annular seal groove.
2, the control valve of multi-level sealed valve stem according to claim 1, it is characterized in that: also be provided with guide pipe (5) and following guide pipe (6) between described valve gap (1) and the valve rod (2), the described guide pipe (5) of going up is arranged on valve gap (1) top, following guide pipe (6) is arranged on valve gap (1) bottom, and seal groove is arranged between guide pipe and the disrance sleeve (4).
3, the control valve of multi-level sealed valve stem according to claim 2 is characterized in that: also be provided with guide pipe lining (7) between described guide pipe and the valve rod (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200828351U CN201137750Y (en) | 2007-12-29 | 2007-12-29 | Multi-layer sealed valve rod control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200828351U CN201137750Y (en) | 2007-12-29 | 2007-12-29 | Multi-layer sealed valve rod control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201137750Y true CN201137750Y (en) | 2008-10-22 |
Family
ID=40038437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200828351U Expired - Fee Related CN201137750Y (en) | 2007-12-29 | 2007-12-29 | Multi-layer sealed valve rod control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201137750Y (en) |
-
2007
- 2007-12-29 CN CNU2007200828351U patent/CN201137750Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081022 Termination date: 20141229 |
|
| EXPY | Termination of patent right or utility model |