CN204739414U - Draw -off valve - Google Patents
Draw -off valve Download PDFInfo
- Publication number
- CN204739414U CN204739414U CN201520306338.XU CN201520306338U CN204739414U CN 204739414 U CN204739414 U CN 204739414U CN 201520306338 U CN201520306338 U CN 201520306338U CN 204739414 U CN204739414 U CN 204739414U
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- Prior art keywords
- valve
- valve seat
- valve body
- exhalant canal
- sealing surface
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Abstract
The utility model discloses a draw -off valve, including the valve body of seting up inhalant canal and exhalant canal, install the disk seat in the valve body, the cover is pressed to the filler that is used for sealing the valve body, the valve rod run through pack to press the cover extend advance the valve body in, its front end be the valve clack that seals with the disk seat cooperation, the valve clack front end is conical sealed face, inhalant canal and exhalant canal all incline to set up according to the direction of rivers from low to high, and the inhalant canal initiating terminal is higher than the exhalant canal initiating terminal, the valve rod periphery is located to the cover barrel casing, and the aperture that has the symmetry is opened to the lateral wall that lies in inhalant canal and exhalant canal on the sleeve, the sealed face upper portion of disk seat is the cofferdam structure, and it has the ring channel to open on it. The draw -off valve who has above -mentioned structure, under the poor operating mode of high pressure, the medium velocity of flow had obtained control after the entry medium flowed into the sleeve, and the entry medium through cofferdam and sealed face two -stage throttle, can effectively reduce pressure medium again when the little aperture of valve, avoids high -speed erosion of flowing sealed face, makes flash distillation and cavitation erosion keep away from sealed face, can not lead to the fact destruction to sealed face.
Description
Technical field
The utility model relates to a kind of drain valve being applicable to High Pressure Difference operating mode.
Background technique
Along with the continuous increase of thermal power generation unit electric motor power, the operating mode of current super (super-) critical fired power generating unit draining system drain valve is very severe, and namely temperature is high, pressure reduction is large, flow velocity is large.This system drain valve often use not enough half a year just because of sealing surface erosion seriously cause valve occur in leakage, substantially reduce the working life of drain valve, also can cause the economic benefit of power plant and unit safety and have a strong impact on.The main cause causing drain valve sealing surface to damage by analysis is that draining system temperature is high, pressure reduction is large, velocity of medium is large and unit load fluctuation, makes valve inevitably be subject to the impact of alternating stress.
Drain valve all adopts two-stage step-down.Under High Pressure Difference operating mode, still very high by the velocity of medium of sealing surface when valve is in small guide vane, Long-Time Service can cause serious erosion attack to valve sealing face, and the working life of valve is not long.Time again because of valve small guide vane, the structure stopping large particle solid impurity is not designed in the upstream of sealing surface, if there is large particle solid impurity in pipeline, what the large particle solid impurity that valve is attached to sealing surface when closing can be easy to cause sealing surface weighs destruction wounded, make valve just occur interior leakage within a short period of time, cause valve seal to lose efficacy.
Model utility content
For the technical problem of above-mentioned existence, the utility model provides a kind of drain valve, reduce medium to the erosion of flap, and impurity not easily enters sealing surface causes damage.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of drain valve, comprises the valve body offering intake tunnel and exhalant canal, the valve seat be arranged in valve body, filler pressing sleeve for closed valve; Valve rod runs through filler pressing sleeve and extends in valve body, and its front end is the flap with valve seat fitted seal; Flap front end is the sealing surface of taper; It is characterized in that: described intake tunnel and exhalant canal are all obliquely installed from low to high by the direction of current, and intake tunnel starting point is higher than exhalant canal starting point; Jacket casing is located at valve rod periphery, and sidewall sleeve being positioned at intake tunnel and exhalant canal has symmetrical aperture; The sealing surface top of valve seat is cofferdam structure, and it has circular groove.
Improve as one, the sealing surface of flap and the sealing surface of valve seat and cofferdam structure are all piled and are welded with cobalt base hard alloy.Improve the hardness in flap and cofferdam.
Improve as one, described valve seat and valve body are demountable structure, are provided with gasket seal between valve seat and valve body; Sleeve is pressed on valve seat, and relies on the gland fastening nuts above it; Described gland nut outer surfaces and valve inner are provided with the screw thread cooperatively interacted.Replacing for convenience detach.
Improve as one, the position that described valve seat coordinates with flap conical seal (contact) face has the secondary seal groove of annular, form double-sealing.
Usefulness of the present utility model is: the drain valve with said structure, under High Pressure Difference operating mode, after entrance medium flows into sleeve, velocity of medium is under control, when valve small guide vane, entrance medium is again through cofferdam and the throttling of sealing surface two-stage, effectively can reduce pressure medium, avoid high speed flow to the erosion of sealing surface, make flash distillation and cavitation erosion away from sealing surface, can not damage sealing surface.
This drain valve compact structure, anatomic shape, its sealing surface has wear-resisting, the feature such as flushing resistance good, sealability is stable, long service life.Can unit safety be ensured, effectively reduce power plant to the purchase cost of drain valve, improve the economic benefit of power plant.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is A place enlarged view.
Mark in figure: 1 valve body, 2 valve seats, 3 filler pressing sleeves, 4 valve rods, 5 flaps, 6 sleeves, 7 cofferdam, 8 gasket seals, 9 apertures, 10 circular grooves, 11 secondary seal grooves, 12 intake tunnels, 13 exhalant canals, 14 gland nuts.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
In order to make the purpose of this utility model, technological scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the utility model comprises the valve body 1 offering intake tunnel 12 and exhalant canal 13, the valve seat 2 be arranged in valve body 1, filler pressing sleeve 3 for closed valve 1; Valve rod 4 runs through filler pressing sleeve 3 and extends in valve body 1, and its front end is the flap 5 with valve seat 2 fitted seal; Flap 5 front end is the sealing surface of taper; It is characterized in that: described intake tunnel 12 and exhalant canal 13 are all obliquely installed from low to high by the direction of current, and intake tunnel 12 starting point is higher than exhalant canal 13 starting point; It is peripheral that sleeve 6 is sheathed on valve rod 4, and sidewall sleeve 6 being positioned at intake tunnel 12 and exhalant canal 13 has symmetrical aperture 9; The sealing surface of valve seat 2 is cofferdam 7 structure, it has circular groove 10.The position that valve seat 2 coordinates with flap 5 conical seal (contact) face has the secondary seal groove 11 of annular.Valve seat 2 and valve body 1 are demountable structure, are provided with gasket seal 8 between valve seat 2 and valve body 1; Sleeve 6 is pressed on flap 5, and relies on the gland nut 14 above it fastening; Described gland nut 14 outer surface and valve body 1 inside are provided with the screw thread cooperatively interacted.The sealing surface of flap 5 and the sealing surface of valve seat 2 and cofferdam 7 structure are preferably all piled and are welded with cobalt base hard alloy.
Sleeve 6 has uniform flow, reduces the effect of velocity of medium and flap 5 guiding.The MEDIA FLOW of valve is to being high in and low out, and entrance medium flows into from the isometrical aperture 9 of the symmetry of sleeve 6, can play medium uniform flow and the medium energy loss that liquidates and reduce the effect of velocity of medium.The keying of flap 5 is all led by sleeve 6.
Cofferdam 7 structure of valve seat 2, has when valve small guide vane and reduces pressure medium and stop the effect that large particle solid impurity passes through.During valve small guide vane, flap 5 and position, valve seat 2 cofferdam 7 constitute the first order throttling of valve, and this position can stop that large particle solid impurity passes through, when valve closing, cofferdam potential energy blocks the conical seal (contact) face place that larger solid particle enters into flap 5 and valve seat 2, now higher by the velocity of medium in cofferdam 7, purging effect can be played to sealing surface, clean seal face, avoid solid particle polluter to damage sealing surface by pressure.
The double-sealing face of valve seat 2 constitutes the second level throttling of valve, and double-sealing face structure is on the position that valve seat 2 coordinates with flap 5 conical seal (contact) face, open an annular secondary seal groove 11, and the conical surface defines two sealing surfaces.After first sealing surface is impaired, sealing can be continued in another backup seal face, can extend valve sealing face working life, can also play protection make its damaged area no longer continue to expand to the damaged part of impaired sealing surface.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (4)
1. a drain valve, comprises the valve body offering intake tunnel and exhalant canal, the valve seat be arranged in valve body, filler pressing sleeve for closed valve; Valve rod runs through filler pressing sleeve and extends in valve body, and its front end is the flap with valve seat fitted seal; Flap front end is the sealing surface of taper; It is characterized in that: described intake tunnel and exhalant canal are all obliquely installed from low to high by the direction of current, and intake tunnel starting point is higher than exhalant canal starting point; Jacket casing is located at valve rod periphery, and sidewall sleeve being positioned at intake tunnel and exhalant canal has symmetrical aperture; The sealing surface of valve seat is cofferdam structure, and it has circular groove.
2. a kind of drain valve according to claim 1, is characterized in that: the sealing surface of flap and the sealing surface of valve seat and cofferdam structure are all piled and be welded with cobalt base hard alloy.
3. a kind of drain valve according to claim 1, is characterized in that: described valve seat and valve body are demountable structure, are provided with gasket seal between valve seat and valve body; Sleeve is pressed on valve seat, and relies on the gland fastening nuts above it; Described gland nut outer surfaces and valve inner are provided with the screw thread cooperatively interacted.
4. a kind of drain valve according to claim 1, is characterized in that: the secondary seal groove position that described valve seat coordinates with flap conical seal (contact) face having annular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520306338.XU CN204739414U (en) | 2015-05-13 | 2015-05-13 | Draw -off valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520306338.XU CN204739414U (en) | 2015-05-13 | 2015-05-13 | Draw -off valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204739414U true CN204739414U (en) | 2015-11-04 |
Family
ID=54421151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520306338.XU Active CN204739414U (en) | 2015-05-13 | 2015-05-13 | Draw -off valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204739414U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023160709A1 (en) * | 2022-02-25 | 2023-08-31 | 浙江盾安人工环境股份有限公司 | Flow adjustment assembly and electronic expansion valve |
-
2015
- 2015-05-13 CN CN201520306338.XU patent/CN204739414U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023160709A1 (en) * | 2022-02-25 | 2023-08-31 | 浙江盾安人工环境股份有限公司 | Flow adjustment assembly and electronic expansion valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |