CN219734406U - High pressure difference cavitation-proof valve - Google Patents
High pressure difference cavitation-proof valve Download PDFInfo
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- CN219734406U CN219734406U CN202321205258.6U CN202321205258U CN219734406U CN 219734406 U CN219734406 U CN 219734406U CN 202321205258 U CN202321205258 U CN 202321205258U CN 219734406 U CN219734406 U CN 219734406U
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- cavitation
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- 238000009434 installation Methods 0.000 claims abstract description 20
- 230000002265 prevention Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 12
- 229920006395 saturated elastomer Polymers 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Details Of Valves (AREA)
- Sliding Valves (AREA)
- Lift Valve (AREA)
Abstract
The utility model discloses a high-pressure-difference cavitation-resistant valve which comprises a valve body, a valve seat, a valve core, a valve cage and a back pressure cage, wherein a first installation cavity and a second installation cavity are sequentially communicated from top to bottom in the valve body; the valve seat is characterized in that a valve cage is arranged at the top of the valve seat, a back pressure cage is arranged at the bottom of the valve seat, and a valve core is movably arranged in the valve cage. The valve medium of the utility model is high in and low out, and the effective energy-saving and pressure-reducing effects are realized through the multi-layer staggered valve cage holes; the back pressure cage structure also plays a role in throttling and reducing pressure, can obviously improve the pressure at the rear end of the valve cage and the main sealing surface, prevents the pressure of a medium from being reduced below saturated vapor pressure, effectively prevents cavitation from happening, and has better practicability.
Description
Technical Field
The utility model belongs to the technical field of cavitation-preventing regulating valves, and particularly relates to a high-pressure-difference cavitation-preventing valve.
Background
In thermal power plants, there are many high differential pressure valves, such as minimum flow valves. The minimum flow valve of the feed pump is arranged at the outlet of the feed pump of the power plant boiler and is connected with the deaerator, and the feed pump of the boiler sends water from the deaerator to the boiler. In order to prevent overheating of the feed pump and cavitation, the flow rate of the feed pump must in any case be greater than a basic flow rate, i.e. a minimum flow rate. When the flow of the boiler feed pump is small, a minimum flow valve needs to be opened in time, so that a part of high-pressure water flows back to the deaerator, and the safe operation of the feed pump is ensured. In normal production processes, the minimum flow valve is used in very harsh environments, including: the pressure difference between the front and the rear of the valve is large; the medium flow speed in the valve is high; the medium temperature in the valve is high; frequent opening and closing in the running process, etc.
The pressure difference between the front and the back of the minimum flow valve is large and is higher than 20MPa. Therefore, the flow velocity of the medium in the valve is very fast when the medium passes through the valve sealing surface, especially when the valve is at a small opening degree, and the valve sealing surface is extremely easy to be seriously washed in a short time so as to realize sealing failure. In addition, when the opening degree is small, the flow velocity of the medium flowing through the sealing surface is extremely increased, the static pressure is rapidly reduced below the fluid saturation pressure, serious cavitation is generated, the shock wave pressure generated by bubble breakage can reach up to kilomega Pa, and fatal damage is generated on the sealing surface, so that the valve sealing is invalid and the valve internal parts are damaged, the valve cannot be regulated or shut off normally, and the main function of the minimum flow valve is lost.
Flushing and cavitation are main reasons for the internal leakage of the minimum flow valve, and mainly damage the valve cage, the valve core and the valve seat, so that the idle work of the water supply pump is increased and the power consumption of the power plant is increased along with the increase of the internal leakage; the boiler water supply amount is reduced, the evaporation amount is reduced, the output of a steam turbine is reduced, the generating efficiency of a unit is seriously affected, and serious loss is brought to a power plant.
Disclosure of Invention
The utility model aims to provide a high-pressure-difference cavitation-resistant valve, and aims to solve the problems.
The utility model is realized mainly by the following technical scheme:
the high-pressure-difference cavitation-prevention valve comprises a valve body, a valve seat, a valve core, a valve cage and a back pressure cage, wherein a first installation cavity and a second installation cavity are sequentially communicated from top to bottom in the valve body, a valve seat with a communicated middle part is arranged between the first installation cavity and the second installation cavity, the first installation cavity is communicated with an input channel of the valve body, and the second installation cavity is communicated with an output channel of the valve body; the valve seat is characterized in that a valve cage is arranged at the top of the valve seat, a back pressure cage is arranged at the bottom of the valve seat, and a valve core is movably arranged in the valve cage.
In order to better realize the utility model, further, the valve cage and the back pressure cage are respectively of a multi-layer cage structure, and holes of adjacent layers are distributed in a staggered manner; the diameter of the holes in each layer of the back pressure cage is smaller than that of the holes in the valve cage, and the total area of the through holes of the back pressure cage is larger than that of the through holes of the valve cage.
In order to better realize the utility model, further, the adjacent layers of the valve cage are arranged in sequence, and the holes of the adjacent layers are staggered by half holes.
In order to better realize the utility model, further, the adjacent layers of the back pressure cage are arranged at intervals, and the holes of the adjacent layers are completely staggered.
In the using process, the medium passes through the valve cage holes, each layer of staggered valve cage holes can generate huge energy loss on the medium, and the multi-layer valve cage has the effective energy-saving and pressure-reducing effects; after flowing into the valve through the gap between the valve seat and the valve core after passing through the valve cage, the medium is subjected to secondary energy loss through the back pressure cage and finally flows into the pipeline behind the valve, the back pressure cage structure also plays a role in throttling and reducing pressure, the back pressure cage structure shares a certain pressure drop, the pressure at the back of the valve cage and the main sealing surface can be obviously improved, the pressure of the medium is prevented from being reduced below saturated vapor pressure, and cavitation is effectively prevented.
In order to better realize the utility model, further, the top of the valve seat is provided with a bearing boss along the circumferential direction, and the bottom of the valve seat extends into the second mounting cavity and is connected with the back pressure cage; the receiving boss is received with the bottom of the first mounting cavity.
In order to better realize the utility model, the middle part of the valve seat is further provided with a conical bearing end surface corresponding to the valve core.
In order to better implement the utility model, the height of the input channel is further greater than the height of the output channel.
The beneficial effects of the utility model are as follows:
the valve medium of the utility model is high in and low out, and the effective energy-saving and pressure-reducing effects are realized through the multi-layer staggered valve cage holes; the back pressure cage structure also plays a role in throttling and reducing pressure, can obviously improve the pressure at the rear end of the valve cage and the main sealing surface, prevents the pressure of a medium from being reduced below saturated vapor pressure, effectively prevents cavitation from happening, and has better practicability. The utility model can effectively prevent the valve from cavitation under the high pressure difference environment through the double cage structure.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic illustration of a construction of a cage;
fig. 3 is a schematic diagram of the back pressure cage structure.
Wherein: 1. a valve core; 2. a valve cage; 3. a valve seat; 4. a back pressure cage; 5. and a valve body.
Detailed Description
In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
Example 1:
the high-pressure-difference cavitation-resistant valve comprises a valve body 5, a valve seat 3, a valve core 1, a valve cage 2 and a back pressure cage 4, wherein a first installation cavity and a second installation cavity are sequentially communicated from top to bottom in the valve body 5, the valve seat 3 with the communicated middle part is arranged between the first installation cavity and the second installation cavity, the first installation cavity is communicated with an input channel of the valve body 5, and the second installation cavity is communicated with an output channel of the valve body 5; the valve cage 2 is installed at the top of disk seat 3, and back pressure cage 4 is installed to the bottom, the inside activity of valve cage 2 is provided with case 1.
Preferably, the valve cage 2 and the back pressure cage 4 are respectively of a multi-layer cage structure, and holes of adjacent layers are distributed in a staggered manner; the diameter of the holes in each layer of the back pressure cage 4 is smaller than that of the holes in the valve cage 2, and the total area of the through holes of the back pressure cage 4 is larger than that of the through holes of the valve cage 2.
Preferably, as shown in fig. 2, adjacent layers of the cage 2 are arranged in sequence, and the holes of the adjacent layers are staggered by half holes.
Preferably, as shown in fig. 3, the adjacent layers of the back pressure cage 4 are arranged at intervals, and the holes of the adjacent layers are completely staggered.
In the using process, the medium passes through the holes of the valve cages 2, each layer of staggered valve cage 2 holes can generate huge energy loss on the medium, and the multi-layer valve cages 2 play an effective role in energy conservation and pressure reduction; after flowing into the valve through the clearance between the valve seat 3 and the valve core 1 after passing through the valve cage 2, the medium is subjected to secondary energy loss through the back pressure cage 4 and finally flows into the pipeline behind the valve, the back pressure cage 4 structure also plays a role in throttling and depressurization, the back pressure cage 4 structure shares a certain pressure drop, the pressure behind the valve cage 2 and at the main sealing surface can be obviously improved, the pressure of the medium is prevented from being reduced below saturated vapor pressure, and cavitation is effectively prevented.
Example 2:
the utility model provides a high pressure differential cavitation-resistant valve, is shown as fig. 1, includes case 1, valve cage 2, disk seat 3, back pressure cage 4 and valve body 5, disk seat 3 is installed in valve body 5, valve cage 2 is installed to the top of disk seat 3, back pressure cage 4 is installed to the below of disk seat 3, case 1 can reciprocate in the hole of valve cage 2.
Preferably, as shown in fig. 2, the valve cage 2 is of a multi-layer cage structure, through-flow small holes are formed in the valve cage 2, and each layer of cage is formed by arranging holes in a staggered manner by half holes. As shown in fig. 3, the back pressure cage 4 is of a multi-layer cage structure, gaps are reserved among layers, holes of adjacent layers are distributed in a staggered mode completely, the holes on each layer of cage are smaller than those of the valve cage 2, and the total area of through holes is larger than that of the through holes of the valve cage 2.
Preferably, the valve core 1 moves in the valve cage 2, the opening degree of the valve is adjusted by adjusting the valve core 1, the opening of the valve cage 2 has an adjusting function, and the actual through-flow requirement is met by the number of the opening.
According to the utility model, the valve cage 2 is of a multi-layer cage structure, through-flow small holes are formed in the valve cage 2, and half holes are staggered from one hole to the next for each layer of cage. The back pressure cage 4 is also arranged into a multi-layer cage structure, gaps are reserved among layers, holes of adjacent layers are distributed in a staggered mode completely, the holes on each layer of cage are smaller than the holes on the valve cage 2, and the total area of through holes is larger than that of the through holes of the valve cage 2. According to the utility model, the high inlet and low outlet of the valve medium are regulated by virtue of the holes of the valve cage 2, and the multi-layer staggered valve cage 2 holes can effectively realize the functions of energy conservation and pressure reduction; the back pressure cage 4 structure behind the valve plays a role in throttling and reducing pressure, and meanwhile, the pressure at the rear end and the main sealing surface of the valve cage 2 can be obviously improved, the pressure of a medium is prevented from being reduced below the saturated vapor pressure, and cavitation is effectively prevented. The utility model can effectively prevent the valve from cavitation under the high pressure difference environment through the double cage structure.
Example 3:
the utility model provides a high pressure differential cavitation-resistant valve, includes case 1, valve cage 2, disk seat 3, back pressure cage 4 and valve body 5, disk seat 3 is installed in valve body 5, valve cage 2 is installed to the top of disk seat 3, back pressure cage 4 is installed to the below of disk seat 3, case 1 can reciprocate in the hole of valve cage 2.
Preferably, the valve cage 2 is of a multi-layer cage structure, and adjacent layers of holes are distributed in a staggered manner. As shown in fig. 2, it is preferably arranged in a half-staggered manner.
Preferably, as shown in fig. 3, the back pressure cage 4 is of a multi-layer cage structure, gaps are reserved between layers, holes of adjacent layers are distributed in a staggered mode completely, the holes on each layer of cage are smaller than the holes on the valve cage 2, and the total area of through holes is larger than that of the through holes of the valve cage 2.
Preferably, as shown in fig. 1, the top of the valve seat 3 is provided with a receiving boss along the circumferential direction, and the bottom of the valve seat extends into the second mounting cavity and is connected with the back pressure cage 4; the receiving boss is received with the bottom of the first mounting cavity. The outer side of the bottom of the valve core 1 is provided with a conical end face, and the middle part of the valve seat 3 is provided with a conical bearing end face corresponding to the valve core 1.
Working principle: the valve medium is high in and low out, the valve opening is adjusted by the up-and-down movement of the valve core 1, the through flow is adjusted by means of the opening of the valve cage 2, the medium passes through the holes of the valve cage 2, each layer of staggered valve cage 2 holes can generate huge energy loss on the medium, and the multi-layer valve cage 2 has the effects of effectively saving energy and reducing pressure; after flowing into the valve through the clearance between the valve seat 3 and the valve core 1 after passing through the valve cage 2, the medium is subjected to secondary energy loss through the back pressure cage 4 and finally flows into the pipeline behind the valve, the back pressure cage 4 structure also plays a role in throttling and depressurization, the back pressure cage 4 structure shares a certain pressure drop, the pressure behind the valve cage 2 and at the main sealing surface can be obviously improved, the pressure of the medium is prevented from being reduced below saturated vapor pressure, and cavitation is effectively prevented. The double cage structure can effectively prevent cavitation of the valve under the high pressure difference environment and protect the valve cage 2, the valve core 1 and the valve seat 3.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present utility model fall within the scope of the present utility model.
Claims (7)
1. The high-pressure-difference cavitation-prevention valve is characterized by comprising a valve body (5), a valve seat (3), a valve core (1), a valve cage (2) and a back pressure cage (4), wherein a first installation cavity and a second installation cavity are sequentially communicated from top to bottom in the valve body (5), the valve seat (3) with a communicated middle part is arranged between the first installation cavity and the second installation cavity, the first installation cavity is communicated with an input channel of the valve body (5), and the second installation cavity is communicated with an output channel of the valve body (5); the valve seat is characterized in that the top of the valve seat (3) is provided with a valve cage (2), the bottom of the valve seat is provided with a back pressure cage (4), and a valve core (1) is movably arranged in the valve cage (2).
2. The high-pressure-difference cavitation-resistant valve according to claim 1, wherein the valve cage (2) and the back pressure cage (4) are respectively of a multi-layer cage structure, and holes of adjacent layers are distributed in a staggered manner; the diameter of the holes in each layer of the back pressure cage (4) is smaller than that of the holes in the valve cage (2), and the total area of the through holes of the back pressure cage (4) is larger than that of the through holes of the valve cage (2).
3. The high pressure differential cavitation-resistant valve according to claim 2, wherein adjacent layers of the cage (2) are arranged in sequence, and the holes of adjacent layers are staggered by half holes.
4. A high pressure difference cavitation-preventing valve according to claim 2, characterized in that the adjacent layers of the back pressure cage (4) are arranged at intervals, and the holes of the adjacent layers are arranged in a completely staggered manner.
5. The high-pressure-difference cavitation-prevention valve according to claim 1, wherein the top of the valve seat (3) is provided with a receiving boss along the circumferential direction, and the bottom extends into the second mounting cavity and is connected with the back pressure cage (4); the receiving boss is received with the bottom of the first mounting cavity.
6. The high-pressure-difference cavitation-prevention valve according to claim 5, wherein the middle part of the valve seat (3) is provided with a conical receiving end surface corresponding to the valve core (1).
7. The high differential pressure cavitation prevention valve of claim 1 wherein the height of the input channel is greater than the height of the output channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321205258.6U CN219734406U (en) | 2023-05-18 | 2023-05-18 | High pressure difference cavitation-proof valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321205258.6U CN219734406U (en) | 2023-05-18 | 2023-05-18 | High pressure difference cavitation-proof valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219734406U true CN219734406U (en) | 2023-09-22 |
Family
ID=88059673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321205258.6U Active CN219734406U (en) | 2023-05-18 | 2023-05-18 | High pressure difference cavitation-proof valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219734406U (en) |
-
2023
- 2023-05-18 CN CN202321205258.6U patent/CN219734406U/en active Active
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