CN204312714U - To empty exhaust steam valve - Google Patents
To empty exhaust steam valve Download PDFInfo
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- CN204312714U CN204312714U CN201420771894.XU CN201420771894U CN204312714U CN 204312714 U CN204312714 U CN 204312714U CN 201420771894 U CN201420771894 U CN 201420771894U CN 204312714 U CN204312714 U CN 204312714U
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- valve
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- seat
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Abstract
To empty exhaust steam valve, relate to the valve field of universal machine, comprise valve body, arrange valve gap in the upper end of valve body, valve gap is fixed by flange and bolt and valve body, and valve gap places a valve rod, connection valve stem nut after valve gap is stretched out in the upper end of valve rod, and the lower end of valve rod to be stretched in valve body and connected spool; In valve body, arrange runner, arrange valve seat at the larynx neck place of runner, valve seat is arranged on the below of valve gap; Valve seat is separated independent of the runner larynx neck place in valve body, and valve seat is pressed abd fixed in valve body by valve gap, between the lower surface and valve body of valve seat, arrange the second seal ring.Valve seat of the present utility model is separated independent of runner larynx neck position in the middle part of valve body, and by sealing gasket and valve seal, valve body does not almost affect for the ess-strain of valve seat, because both are separated completely.Another advantage is, avoids complicated highly difficult construction, shortens the repair cycle, reduces maintenance cost.
Description
Technical field
The utility model relates to the valve field of universal machine, for heat power plant boiler system to empty steam discharge.
Background technique
Usually be provided with Electric Actuated Stop Valves valve before station boiler steam security valve, when boiler pressure is increased to transition point, they are prior to safety valve pressure release action, prevent the frequent take-off of main safety valve from damaging, protection safety valve.This kind of valve major part power plant is at present still based on common stop valve.Because discharge of steam pressure is high, temperature is high, when directly discharge sky, the large pressure reduction of valve seat temperature difference is large, and very easily cause valve seat ftracture, therefore this kind of valves leakage phenomenon generally, has a strong impact on the lifting of unit operation efficiency and reliability, increase unit operation cost.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of to empty exhaust steam valve, around reduction pressure reduction, reduction valve seat, valve performance is improved in the aspect such as the temperature difference, evenly valve seat ambient stress, even velocity of flow, maintainability performance, easily disintegration, reach sealing lasting, long service life, the combination property such as non-maintaining.
The purpose of this utility model is achieved in that empty exhaust steam valve, comprise valve body, in the upper end of valve body, valve gap is set, valve gap is fixed by flange and bolt and valve body, first seal ring is set between valve gap and valve body, valve gap places a valve rod, and connection valve stem nut after valve gap is stretched out in the upper end of valve rod, and the lower end of valve rod to be stretched in valve body and connected spool; In described valve body, arrange runner, arrange valve seat at the larynx neck place of runner, valve seat is arranged on the below of valve gap; Described valve seat is separated independent of the runner larynx neck place in valve body, and valve seat is pressed abd fixed in valve body by valve gap, between the lower surface and valve body of valve seat, arrange the second seal ring.
Valve seat of the present utility model is separated independent of runner larynx neck position in the middle part of valve body, by sealing gasket and valve seal, this avoid body type valve seat (Nonseparation, direct built-up welding sealing surface on valve body) high temperature discharge time, the temperature difference stress distribution of valve seat both sides complexity, valve body does not almost affect for the ess-strain of valve seat, because both are separated completely.Another advantage is, even if valve seat finds crackle, weighs these defects wounded and also can change or isolate valve body reparation online, and does not need to cut open valve body and departs from pipeline, avoid complicated highly difficult construction, shorten the repair cycle, reduce maintenance cost.
As improvement of the present utility model, between described valve gap and valve seat, arrange current-sharing cover, current-sharing cover comprises current-sharing enclosure cylinder, and current-sharing enclosure jacket casing is put on described spool, arrange several equal openings in the bottom radial direction of current-sharing enclosure cylinder, several equal openings are connected with runner; Described spool comprises the insert body and valve cage that are wholely set, and valve cage is arranged on the lower end of insert body, and on valve cage, radial direction arranges several valve core through hole, and several valve core through hole are connected with runner.Current-sharing cover of the present utility model and spool lower sleeve portion form two-stage decompression current-sharing.The current-sharing sleeve of current-sharing cover bottom and the valve cage cylindrical of spool bottom have all offered a large amount of aperture, and fluid is depressurized respectively through two-stage aperture, and actual discharge pressure is reduced.Which reduce the pressure reduction flowing through valve seat both sides, be conducive to protecting valve seat.Simultaneously due to the guide functions of the valve cage of spool bottom, fluid mainly flows out in the middle part of valve cage, and the high-speed large-flow that this avoid when high-velocity fluid flows through valve seat washes away, and makes sealing surface of seat be in guard mode, thus extends sealing surface working life.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present utility model.
Fig. 2 is A portion enlarged view in Fig. 1.
Embodiment
As shown in Figure 1, 2, valve body 1 is comprised to empty exhaust steam valve, in the upper end of valve body 1, valve gap 8 is set, valve gap 8 is fixed with valve body 1 by flange 10 and bolt 11, first seal ring 9 is set between valve gap 8 and valve body 1, valve gap 8 places a valve rod 6, and connection valve stem nut 14 after valve gap 8 is stretched out in the upper end of valve rod 6, and the lower end of valve rod 6 to be stretched in valve body 1 and connected spool 5.In valve body 1, arrange runner 7, arrange valve seat 3 at the larynx neck place of runner 7, valve seat 3 is arranged on the below of valve gap 8, arranges current-sharing cover 4 between valve gap 8 and valve seat 3.Valve seat 3 is separated independent of the runner 7 larynx neck place in valve body 1, and current-sharing cover 4, valve seat 3 are pressed abd fixed in valve body 1 by valve gap 8, between the lower surface and valve body 1 of valve seat 3, arrange the second seal ring 2.
Current-sharing cover 4 comprises current-sharing enclosure cylinder 4-1, and current-sharing enclosure cylinder 4-1 is nested with on spool 5, arranges several equal opening 4-2 in the bottom radial direction of current-sharing enclosure cylinder 4-1, and several equal opening 4-2 are connected with runner 7.Spool 5 comprises the insert body 5-1 and valve cage 5-2 that are wholely set, and valve cage 5-2 is arranged on the lower end of insert body 5-1, and on valve cage 5-2, radial direction arranges several valve core through hole 5-3, and several valve core through hole 5-3 is connected with runner 7.
Valve event process is as follows: drive unit actuate valve stem nut 14, and band ovable valve stem 6 is elevated, thus band movable valve plug 5 is elevated, when spool 5 sealing surface contacts with valve seat 3 sealing surface, and valve closing, on the contrary then open, realize the switch of valve with this, i.e. discharge and closedown.
Claims (2)
1. pair empty exhaust steam valve, comprise valve body, in the upper end of valve body, valve gap is set, valve gap is fixed by flange and bolt and valve body, first seal ring is set between valve gap and valve body, valve gap places a valve rod, and connection valve stem nut after valve gap is stretched out in the upper end of valve rod, and the lower end of valve rod to be stretched in valve body and connected spool; In described valve body, arrange runner, arrange valve seat at the larynx neck place of runner, valve seat is arranged on the below of valve gap; It is characterized in that: described valve seat is separated independent of the runner larynx neck place in valve body, and valve seat is pressed abd fixed in valve body by valve gap, between the lower surface and valve body of valve seat, arrange the second seal ring.
2. according to claim 1 to empty exhaust steam valve, it is characterized in that: current-sharing cover is set between described valve gap and valve seat, current-sharing cover comprises current-sharing enclosure cylinder, current-sharing enclosure jacket casing is put on described spool, arrange several equal openings in the bottom radial direction of current-sharing enclosure cylinder, several equal openings are connected with runner; Described spool comprises the insert body and valve cage that are wholely set, and valve cage is arranged on the lower end of insert body, and on valve cage, radial direction arranges several valve core through hole, and several valve core through hole are connected with runner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420771894.XU CN204312714U (en) | 2014-12-10 | 2014-12-10 | To empty exhaust steam valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420771894.XU CN204312714U (en) | 2014-12-10 | 2014-12-10 | To empty exhaust steam valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204312714U true CN204312714U (en) | 2015-05-06 |
Family
ID=53135032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420771894.XU Active CN204312714U (en) | 2014-12-10 | 2014-12-10 | To empty exhaust steam valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204312714U (en) |
-
2014
- 2014-12-10 CN CN201420771894.XU patent/CN204312714U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |