CN105422982A - Pressure reducing valve - Google Patents
Pressure reducing valve Download PDFInfo
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- CN105422982A CN105422982A CN201511030440.2A CN201511030440A CN105422982A CN 105422982 A CN105422982 A CN 105422982A CN 201511030440 A CN201511030440 A CN 201511030440A CN 105422982 A CN105422982 A CN 105422982A
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- discharge orifice
- segment discharge
- shrouding
- shroud
- flap
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a pressure reducing valve. The pressure reducing valve comprises a valve clack and further comprises at least two layers of nested covers, wherein adjacent covers are fixedly connected and are in seal fit, the valve clack is nested in the cover on the innermost layer and is in seal fit with the cover on the innermost layer, first orifices for communicating the inner sides and the outer sides of the covers are formed in the covers, the first orifices in the adjacent layers of covers are communicated, and the first orifices in at least two layers of covers are staggered and communicated. According to the pressure reducing valve, the maximum pressure reducing ratio of the cover on the outermost layer to the valve clack is obtained through accumulation of gradual small pressure reducing rates of at least two layers of covers, meanwhile, the added valve of the throttling area is obtained by increasing the flow resistance and reducing the flow coefficient, accordingly, the flow speed can be reduced, and vibration and noise reduction of the pressure reducing valve can be realized.
Description
Technical field
The present invention relates to valve technology field, particularly a kind of reduction valve.
Background technique
Along with Large Copacity large-sized unit be the fast development of the pressure facility of power source with steam, for the power station taking steam as medium, the performance quality of reduction valve seems more and more important.
In existing a kind of reduction valve, reduction valve comprises flap and is set in shrouding outside flap, flap can relative to shrouding movement, corresponding throttle orifice is respectively arranged with shrouding at flap, by to flap relative to the lift adjustment of shrouding, different orifice sizes, Flow-rate adjustment and effect of easing stress can be realized.But this kind of reduction valve, in running, cannot be coordinated mutually to the problem of the aspects such as large Pressure reducing ratio, orifice size, flow velocity and vibrating noise, the noise in particularly using is too high, causes very big interference to staff.
Therefore, how reducing reduction valve noise in use, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
In view of this, the object of this invention is to provide a kind of reduction valve, this reduction valve noise is in use less.
For achieving the above object, the invention provides following technological scheme:
A kind of reduction valve, comprise flap, also comprise at least two-layer mutually sheathedly to shroud, shroud described in adjacent layer and be fixedly connected with and be sealed and matched, be placed in described flap and shroud described in innermost layer and to be sealed and matched with shrouding described in innermost layer, describedly shroud the first segment discharge orifice being provided with and shrouding inside and outside both sides described in connection, the described first segment discharge orifice shrouded described in adjacent layer is connected, and at least two-layer described in the described first segment discharge orifice that shrouds to be staggered connection.
Preferably, the described first segment discharge orifice shrouded described in adjacent layer is staggered connection.
Preferably, described in shroud the axis of shrouding described in edge and be provided with first segment discharge orifice described at least two row successively, described in each row, first segment discharge orifice parallels setting, and the line number of shrouding described first segment discharge orifice described in all is identical and line space distribution is identical.
Preferably, shroud described in adjacent layer between the described first segment discharge orifice of going together mutually and be provided with around the described groove shrouding the ring-type of circumference.
Preferably, described in shroud that often to go described first throttle hole number identical, and described first segment discharge orifice is uniformly distributed in described circumference of shrouding.
Preferably, described in shroud and be at least three layers, with shroud described in one deck adjacent two-layer described in shroud that the described first segment discharge orifice of going together is coaxial respectively to be arranged.
Preferably, described flap is placed on described in innermost layer slidably and shrouds, and the work wall of described flap is provided with second section discharge orifice, and under described flap raised state, described second section discharge orifice is communicated with the inner side of described first segment discharge orifice and described work wall.
Preferably, described flap is connected with the power unit of the stop position for controlling described flap movement.
Preferably, the first lug boss being provided with and moving down for limiting described flap is shrouded described in innermost layer, described first boss is in the below of first segment discharge orifice described in lower side, described work wall is provided with the second lug boss for being sealed and matched with described first lug boss, described second boss is in the top of second section discharge orifice described in top side, under the state that described first lug boss matches with described second lug boss, the inner hole surface of shrouding described in the outer circumferential face of described work wall and innermost layer fits.
Reduction valve provided by the invention, comprise flap and be sheathed on outside flap at least two-layer shrouding, first segment discharge orifice is provided with on shrouding, adjacent layer shrouds first segment discharge orifice and is connected, and at least there is two-layer shrouding, its ectomesoderm shrouds and at least there is first segment discharge orifice that a first segment discharge orifice shrouds with internal layer and be staggered and be communicated with.When using this reduction valve, by flap and the relative variability of position between shrouding, the outer side inflow that fluid shrouds from outermost surface can be made, and the first segment discharge orifice shrouded by innermost layer flows out.Then can be accumulated by least two-layer little step by step Pressure reducing ratio shrouded by the outermost surface large Pressure reducing ratio shrouded between flap and obtain, simultaneously, by increasing flow resistance, reducing the increment that flow coefficient obtains orifice size, thus flow velocity can be reduced to realize the vibration and noise reducing of reduction valve.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the structural representation that in the specific embodiment of reduction valve provided by the present invention, first segment discharge orifice and second section discharge orifice stagger under state completely;
Fig. 2 is the structural representation that in the specific embodiment of reduction valve provided by the present invention, first segment discharge orifice and second section orifice portion stagger under state;
Fig. 3 is the structural representation in the specific embodiment of reduction valve provided by the present invention under first segment discharge orifice and the complete communicating state of second section discharge orifice;
Fig. 4 is the localized axial cross-sectional schematic of the specific embodiment of reduction valve provided by the present invention;
Fig. 5 be in Fig. 4 A-A to cross-sectional schematic.
In Fig. 1 to Fig. 5,1 for shrouding, and 11 is first segment discharge orifice, and 12 is the first lug boss, and 2 is flap, and 21 is second section discharge orifice, and 22 is the second lug boss.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Core of the present invention is to provide a kind of reduction valve, and this reduction valve noise is in use less.
Please refer to Fig. 1 to Fig. 5, Fig. 1 is the structural representation that in the specific embodiment of reduction valve provided by the present invention, first segment discharge orifice and second section discharge orifice stagger under state completely; Fig. 2 is the structural representation that in the specific embodiment of reduction valve provided by the present invention, first segment discharge orifice and second section orifice portion stagger under state; Fig. 3 is the structural representation in the specific embodiment of reduction valve provided by the present invention under first segment discharge orifice and the complete communicating state of second section discharge orifice; Fig. 4 is the localized axial cross-sectional schematic of the specific embodiment of reduction valve provided by the present invention; Fig. 5 be in Fig. 4 A-A to cross-sectional schematic.
In a kind of specific embodiment of reduction valve provided by the present invention, reduction valve comprises flap 2 and shrouds 1, shroud 1 at least two-layer and mutually sheathed, adjacent layer shroud 1 between be fixedly connected with and keep being sealed and matched, that is, in the using process of this reduction valve, the different layers relative position shrouded between 1 is fixing.Shroud the sleeve-like configuration that 1 is hollow, being placed on innermost layer in flap 2 shrouds among 1, and flap 2 and innermost layer are sealed and matched between shrouding 1.Be sealed and matched refer to adjacent layer shroud 1 between or shroud between 1 and flap 2 and fluid can only be passed through by specific runner.Be provided with first segment discharge orifice 11 shrouding on 1, and first segment discharge orifice 11 can be communicated with the inside and outside both sides shrouding 1, namely first segment discharge orifice 11 sleeve-shaped is shrouded 1 inner hole wall and periphery wall get through.Wherein, it is be communicated with that adjacent layer shrouds between the first segment discharge orifice 11 on 1, and the connection that is staggered between at least two-layer first segment discharge orifice 11 shrouded on 1, the connection that is staggered refers to shroud on 1 at one deck at least exists a first segment discharge orifice 11, fluid can not shroud in any one first segment discharge orifice 11 of 1 along the axis inflow adjacent inner layer of this first segment discharge orifice 11 always, that is, when shrouding 1 for time two-layer, skin shrouds on 1 and at least there is a first segment discharge orifice 11, in this first segment discharge orifice 11, fluid is flowed into by bending runner in the first segment discharge orifice 11 of internal layer, when the number of plies of shrouding 1 is greater than two-layer, at least there is a pair and adjacent shroud 1, at least there is a first segment discharge orifice 11 outer field shrouding on 1, the fluid in this first segment discharge orifice 11 is flowed in the first segment discharge orifice 11 shrouding on 1 of adjacent inner layer by bending runner.
When using this reduction valve, by flap 2 and the relative variability shrouding position between 1, fluid can be made to shroud the outer side inflow of 1 from outermost surface, and the first segment discharge orifice 11 shrouding 1 by innermost layer flow out.Gas transition process closely isenthalpic process in reduction valve, then the parameter in flow process meets following formula
and w=(Q
sν
j)/(3.6 × f
j), wherein,
for expansion coefficient, μ
jfor flow coefficient, f
jfor circulation area, Q
sfor flow, P
jfor pressure, ν
jfor specific volume, β
jfor Pressure reducing ratio, w is flow velocity.Can learn according to above-mentioned formula, dogleg passage can produce larger flow resistance, shares little Pressure reducing ratio β
j, reduce the specific volume ν of increment
j, thus relatively increase circulation area f
j, finally can obtain lower flow velocity w.That is, can be accumulated by least two-layer little step by step Pressure reducing ratio shrouding 1 and obtain shrouding large Pressure reducing ratio 1 to flap 2 by outermost surface, meanwhile, by increasing flow resistance, reducing the increment that flow coefficient obtains orifice size, thus flow velocity can be reduced to realize vibration and noise reducing.
In a kind of preferred embodiment, the first segment discharge orifice 11 shrouded on 1 of adjacent layer is staggered connection, and that is, every adjacent layer shrouds the first segment discharge orifice 11 all existing between 1 and be communicated with by dogleg passage.Adjacent layer shroud first segment discharge orifice 11 between 1 be staggered be communicated with set-up mode, achieve multistage bending runner decompression, due to the gas transition process closely isenthalpic process in reduction valve, dogleg passage orderly from outside to inside can be formed in this reduction valve, a fluid stream can be forced to shunt continuously and collaborate, the turbulent flow that the bending change flowed to produces and a fluid stream cause energy dropoff in conjunction with impact, thus effectively reduce the noise in decompression process.
Shroud on 1 at every layer, the set-up mode of first segment discharge orifice 11 has various ways, such as, can arrange at least two row first segment discharge orifices 11 shrouding on 1, and parallel between each row first segment discharge orifice 11 along the axis of shrouding 1.Further, the line number of all first segment discharge orifices 11 shrouded on 1 can be made identical and line space distribution is identical, thus make the arrangement of first segment discharge orifice 11 comparatively regular.Wherein, row refers at least one the first segment discharge orifice 11 set gradually around the circumference of shrouding 1, and every a line first throttle hole 11 can connect into a closed curve along the circumference of shrouding 1; Line space is identical to be referred to using a certain perpendicular to shrouding the plane of 1 axis as basal plane, is equipped with a closed curve be linked to be by a line first segment discharge orifice 11 with basal plane same vertical distance.Particularly, the first segment discharge orifice 11 of every a line can be parallel to the plane of above-mentioned basal plane around formation one, thus makes the arrangement of first segment discharge orifice 11 comparatively regular.
What shroud first segment discharge orifice 11 between 1 for adjacent layer is communicated with multiple implementation, particularly, can realize by arranging the passage be communicated with between first segment discharge orifice 11 and at least one first segment discharge orifice 11 of adjacent inner layer.Such as, a groove can be set between first segment discharge orifice 11 and an out-of-alignment first segment discharge orifice 11 of adjacent inner layer, fluid is entered in first segment discharge orifice 11 corresponding in adjacent inner layer by changing flow direction after outer field first segment discharge orifice 11, thus ensures the fluid passage forming bending between the first segment discharge orifice 11 that adjacent layer shrouds 1.Wherein, the bearing of trend of groove can be arranged along the axis or circumference of shrouding 1 according to the position relation of at least two the first segment discharge orifices 11 be communicated with or number.
In a kind of preferred embodiment, allly shroud first segment discharge orifice 11 on 1 and arrange by the mode in an above-mentioned embodiment, namely to shroud 1 line number of axially arranging all identical with line space, then the connection shrouded on 1 between first segment discharge orifice 11 of adjacent layer specifically can be realized by the groove arranged around the ring-type of shrouding 1 central shaft, this groove shrouds between same a line first throttle hole 11 of 1 at adjacent two layers, then this groove can be communicated with all first segment discharge orifices 11 that adjacent layer is gone together.Particularly, this groove can be arranged on the adjacent two layers internal layer shrouded in 1 and shroud on 1, is namely located at and shrouds on the periphery wall of 1, so that processing.In the present embodiment, the groove of ring-type is set between the first segment discharge orifice 11 that a line first segment discharge orifice 11 and adjacent layer are gone together, then shrouds the first segment discharge orifice 11 on 1 with the upper outside layer of a line and communicate with any one first segment discharge orifice 11 of adjacent inner layer.Shroud 1 at fluid from skin to flow to internal layer and shroud the process of 1, may flow in the first segment discharge orifice 11 of going together with close together in adjacent inner layer; But, when first segment discharge orifice 11 of adjacent inner layer occur blocking or other reasons can not make fluid by time, fluid can shroud at this layer in other first segment discharge orifices 11 on the colleague of 1 and flow into, and ensures the reliable use of reduction valve.
In each embodiment above-mentioned, each layer shrouds the quantity of first segment discharge orifice 11 on 1 and arrangement mode can be arranged according to specific needs, thus makes flap 2 have good adjustment line style.Alternatively, in every a line that can make to shroud 1, the quantity of first segment discharge orifice 11 is identical, and the first segment discharge orifice 11 in every a line is uniformly distributed, to facilitate the processing of first segment discharge orifice 11 in the circumference of shrouding 1.Further, one deck can be made to shroud first segment discharge orifice 11 on 1 and to shroud 1 projection axially between two of adjacent layer adjacent first segment discharge orifices 11, a first segment discharge orifice 11 and same layer specifically can be made to shroud the distance of any one adjacent first segment discharge orifice 11 on 1 identical, thus strengthen noise reduction effect.This reduction valve can be widely used in compressible fluid and incompressible fluid, different operating modes through steam medium and aqueous medium are applied, the progression that the number of plies of shrouding 1 is accumulated as the little Pressure reducing ratio of total reduction ratio in other words can rise to the order of magnitude of tens from units, the better performances of vibration and noise reducing and expenditure and pressure.
In above-described embodiment, the number of plies and the every layer of thickness shrouding 1 that shroud 1 can be arranged according to the control of the distribution of Pressure reducing ratio and flow velocity, particularly, at least three layers can be set to by shrouding 1, different layers shrouds between 1 and the mode of transition fit can be adopted mutually to be pressed into, with ensure to shroud 1 be sealed and matched and each layer shrouds reliable isolation between 1, facilitate the processing of reduction valve to assemble simultaneously.
Shroud in the concrete set-up mode of first segment discharge orifice 11 on 1 at different layers, alternatively, can making to shroud with one deck 1, adjacent two-layer to shroud the first segment discharge orifice 11 of going together on 1 coaxial respectively, that is, one deck shroud 1 both sides and and this layer shroud 1 adjacent two and shroud between 1, more outerly shroud first segment discharge orifice 11 on 1 and to shroud first segment discharge orifice 11 one_to_one corresponding on 1 at comparatively internal layer coaxial, thus it is comparatively even to make different layers shroud the displaced manner of the first segment discharge orifice 11 between 1, large for single-stage Pressure reducing ratio is resolved into multistage little Pressure reducing ratio, form regular pressure drop distribution step by step, reduce the flow velocity of fluid in each first segment discharge orifice 11, thus effective vibration and noise reducing, and pressure regulating performance is better, manufacturing is convenient to while realizing fluid multistage turnover.
The pressure-reducing function shrouding 1 in reduction valve needs to be realized by flap 2 and the change of shrouding relative position between 1, in a kind of preferred embodiment, work wall corresponding with shrouding 1 on flap 2 is provided with second section discharge orifice 21, this work wall is the structure of hollow, and this work wall is corresponding with shrouding the part arranging first segment discharge orifice 11 on 1 and with the use of to realize decompression place, fluid can flow out from the hollow space of work wall.By flap 2 and the change shrouding 1 relative position, first segment discharge orifice 11 can be controlled and whether be communicated with second section discharge orifice 21, to realize decompression.
Flap 2 with shroud can changing in several ways of 1 relative position, such as, around the rotation of the central shaft shrouding 1 or flap 2, second section discharge orifice 21 can be connected with first segment discharge orifice 11 or be staggered shrouding in 1 by flap 2.
Or, flap 2 in each embodiment above-mentioned can be set to slidably and be placed on innermost layer and shroud in 1, that is, flap 2 can move up and down along the axis of shrouding 1, under flap 2 raised state, first segment discharge orifice 11 is communicated with second section discharge orifice 21, under the non-raised state of flap 2, in other words flap 2 relative to shroud 1 be positioned at lower side time, first segment discharge orifice 11 and second section discharge orifice 21 stagger completely.Further, flap 2 can also be connected with power unit, is controlled the stop position of flap 2 movement by power unit.In an above-mentioned embodiment, all axially arrangements that first segment discharge orifice 11 is shrouding 1 shrouded on 1 are identical, and groove is arranged on adjacent layer shrouds between the first throttle of the colleague mutually hole 11 of 1, and between adjacent lines first segment discharge orifice 11, particularly, can make adjacent layer shroud 1 ectomesoderm shroud 1 inner hole surface and the internal layer outer circumferential face that shrouds 1 fit, to ensure reliable sealing between adjacent lines first segment discharge orifice 11 and isolation.That is, fluid can only flow along the bending runner shrouded in 1 radial direction, and can not shroud 1 axially flow, then now, controlled the stop position of flap 2 slip by power unit, first segment discharge orifice 11 number that fluid can be made to circulate can be controlled.
The application of the reduction valve of the present embodiment specifically can with shroud 1 axially for above-below direction is described.When flap 2 is closed, flap 2 is under non-raised state in other words, second section discharge orifice 21 is placed in the downside of the most descending first segment discharge orifice 11, and namely second section discharge orifice 21 and first segment discharge orifice 11 stagger completely, and fluid can not be shrouded the inner side of the outer side inflow work wall of 1 by outermost surface; Move along with on flap 2, the part second section discharge orifice 21 be positioned on the upside of work wall communicates with the part first segment discharge orifice 11 be positioned on the downside of work wall, and fluid can passage divide the first segment discharge orifice 11 communicated to flow into inside work wall with second section discharge orifice 21; When flap 2 moves to maximum removable place, first segment discharge orifice 11 is communicated with whole second section discharge orifice 21.Visible, the flap 2 of this lifting able to turn on or off by with the relative movement shrouding 1, the independent negotiable area and the flow that control fluid can be realized, the flow velocity of fluid and kinetic energy are changed, cause the different pressure losses, thus it is adjustable to realize reduction valve delivery pressure, the application area of Enlarging decompression valve, there is the regulatory function of small-large flow, and in the operating mode of large Pressure reducing ratio flow adjustable extent reach under the prerequisite of 10% to 100% still can effective coutroi velocity.
In above-described embodiment to work wall relative to shroud 1 move down time stop position control have multiple concrete set-up mode.In a kind of preferred embodiment, the below can shrouding the lower side first segment discharge orifice 11 of 1 at innermost layer arranges the first lug boss 12, move down for limiting flap 2, lower side first segment discharge orifice 11 refers to the axially the most next first segment discharge orifice 11 shrouding 1, correspondingly, work wall arranges the second lug boss 22 above top side second section discharge orifice 21, for being sealed and matched with the first lug boss 12, top side second section discharge orifice 21 refers to the axially the most last second section discharge orifice 21 shrouding 1, under the state that the first lug boss 12 matches with the second lug boss 22, when the wall that namely works is positioned at the greatest limit position that can move down, the inner hole surface that the work outer circumferential face of wall and innermost layer shroud 1 fits, to ensure the zero leakage of reduction valve.Particularly, the first lug boss 12 with shroud 1 and can be integrated part, meanwhile, the second lug boss 22 can be integrated part with flap 2, to ensure the sealing of reduction valve, reduces manufacture difficulty.Certainly, the control that also can realize pan position under work wall by limited ring or miscellaneous part.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
Above reduction valve provided by the present invention is described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (9)
1. a reduction valve, comprise flap (2), it is characterized in that, also comprise at least two-layer mutually sheathedly to shroud (1), shroud (1) described in adjacent layer be fixedly connected with and be sealed and matched, be placed on described in innermost layer in described flap (2) to shroud (1) and shroud (1) with described in innermost layer and be sealed and matched, described shroud (1) is provided with described in connection the first segment discharge orifice (11) shrouding (1) inside and outside both sides, the described first segment discharge orifice (11) of shrouding described in adjacent layer on (1) is connected, and at least two-layer described in the described first segment discharge orifice (11) of shrouding on (1) to be staggered connection.
2. reduction valve according to claim 1, is characterized in that, the described first segment discharge orifice (11) of shrouding described in adjacent layer on (1) is staggered connection.
3. reduction valve according to claim 2, it is characterized in that, the described axis of shrouding (1) described in (1) upper edge of shrouding is provided with first segment discharge orifice (11) described at least two row successively, described in each row, first segment discharge orifice (11) parallels setting, and the line number of shrouding (1) upper described first segment discharge orifice (11) described in all is identical and line space distribution is identical.
4. reduction valve according to claim 3, is characterized in that, shrouds between described first segment discharge orifice (11) that (1) goes together mutually and be provided with around the described groove shrouding the ring-type of (1) circumference described in adjacent layer.
5. reduction valve according to claim 4, it is characterized in that, describedly to shroud on (1) that often to go described first segment discharge orifice (11) quantity identical, and described first segment discharge orifice (11) is uniformly distributed in described circumference of shrouding (1).
6. reduction valve according to claim 5, it is characterized in that, described shroud (1) is at least three layers, shrouds to shroud (1) upper described first segment discharge orifice (11) gone together described in (1) adjacent two-layer and coaxially arrange respectively with described in one deck.
7. the reduction valve according to claim 1 to 6 any one, it is characterized in that, described flap (2) is placed on described in innermost layer slidably and shrouds (1), the work wall of described flap (2) is provided with second section discharge orifice (21), under described flap (2) raised state, described second section discharge orifice (21) is communicated with the inner side of described first segment discharge orifice (11) and described work wall.
8. reduction valve according to claim 7, is characterized in that, described flap (2) is connected with the power unit of the stop position for controlling described flap (2) movement.
9. reduction valve according to claim 8, it is characterized in that, shroud (1) described in innermost layer and be provided with the first lug boss (12) moved down for limiting described flap (2), described first lug boss (12) is positioned at the below of first segment discharge orifice (11) described in lower side, described work wall is provided with the second lug boss (22) for being sealed and matched with described first lug boss (12), described second lug boss (22) is positioned at the top of second section discharge orifice (21) described in top side, under the state that described first lug boss (12) is matched with described second lug boss (22), the inner hole surface of shrouding (1) described in the outer circumferential face of described work wall and innermost layer fits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511030440.2A CN105422982A (en) | 2015-12-31 | 2015-12-31 | Pressure reducing valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511030440.2A CN105422982A (en) | 2015-12-31 | 2015-12-31 | Pressure reducing valve |
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|---|---|
| CN105422982A true CN105422982A (en) | 2016-03-23 |
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ID=55501408
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|---|---|---|---|
| CN201511030440.2A Pending CN105422982A (en) | 2015-12-31 | 2015-12-31 | Pressure reducing valve |
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| CN107906368A (en) * | 2017-12-08 | 2018-04-13 | 杭州华惠阀门有限公司 | A kind of reducing-and-cooling plant |
| CN110500419A (en) * | 2018-05-17 | 2019-11-26 | 费希尔控制产品国际有限公司 | Valve cage with cell structure |
| CN113464715A (en) * | 2021-07-20 | 2021-10-01 | 重庆科技学院 | Three-stage pressure reducing cage sleeve type throttle valve |
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| CN107906368A (en) * | 2017-12-08 | 2018-04-13 | 杭州华惠阀门有限公司 | A kind of reducing-and-cooling plant |
| CN110500419A (en) * | 2018-05-17 | 2019-11-26 | 费希尔控制产品国际有限公司 | Valve cage with cell structure |
| CN113464715A (en) * | 2021-07-20 | 2021-10-01 | 重庆科技学院 | Three-stage pressure reducing cage sleeve type throttle valve |
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