CN108662187A - A kind of motor-driven valve - Google Patents
A kind of motor-driven valve Download PDFInfo
- Publication number
- CN108662187A CN108662187A CN201710211150.0A CN201710211150A CN108662187A CN 108662187 A CN108662187 A CN 108662187A CN 201710211150 A CN201710211150 A CN 201710211150A CN 108662187 A CN108662187 A CN 108662187A
- Authority
- CN
- China
- Prior art keywords
- valve
- motor
- hole
- throttling passage
- driven valve
- 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.)
- Pending
Links
Classifications
-
- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0605—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
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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
- F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
- F16K47/045—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member and the closure member being rotatable
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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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
- F16K5/10—Means for additional adjustment of the rate of flow
Abstract
The invention discloses a kind of motor-driven valves, including valve body, valve ball, valve rod and plug screw, motor-driven valve is provided with first interface, second interface, first passage and second channel, the first valve seat and the second valve seat are additionally provided in valve body, first passage is set to the first valve seat, and second channel is set to the second valve seat；Valve ball is provided with card slot, centre bore, through-hole and at least one throttling passage, one end of centre bore is located at the outer surface of valve ball, the other end of centre bore is connected with throttling passage and through-hole, the flow area of throttling passage is much smaller than the flow area of centre bore, and the flow area of throttling passage is also much smaller than the flow area of through-hole.The motor-driven valve of the present invention is controlled by the rotation of control valve ball to realize that bidirectional throttle, big flow all-pass and fully closed fluid flow.
Description
Technical field
The present invention relates to field of fluid control, and in particular to a kind of bidirectional throttle-standard-sized sheet motor-driven valve.
Background technology
Requirement with people to energy-saving and emission-reduction is higher and higher, also higher and higher to the performance requirement of air-conditioning system, heat pump
Type air-conditioning system also becomes current popular application.When traditional expansion valve, either electric expansion valve or thermal expansion
Valve is merely able to play the role of throttling, not the function of standard-sized sheet.In order to realize the function of bidirectional throttle and completely open and close, in sky
Multiple expansion valves are generally required in adjusting system and multiple solenoid valves are combined the function that could realize bidirectional throttle and completely open and close.
With the increase required Performance for Air Conditioning Systems, to the increase that air-conditioning system compact requires, also based on cost
Consider, provided that a kind of motor-driven valve with bidirectional throttle and completely open and close function, which is current those skilled in the art, is badly in need of solution
Certainly the technical issues of.
Invention content
In order to solve the above technical problems, the technical solution of the present invention is to provide a kind of motor-driven valve, using spherical valve core and
Fluting and through-hole in valve ball, flow is controlled by controlling the rotation of valve ball.
The present invention provides a kind of motor-driven valve, including valve body, be placed in the valve body valve ball, connect with the valve ball
The valve rod and plug screw connect, the motor-driven valve is provided with first interface, second interface, first passage and second channel, described
The first valve seat and the second valve seat are additionally provided in valve body, the first passage is set to first valve seat, the second channel
It is set to second valve seat, wherein the relatively close first interface of first valve seat and the first passage and described the
One interface is connected, and the relatively close second interface of the second channel and is connected with the second interface；
The valve ball is provided with and the matched card slot of the valve rod and centre bore, through-hole and at least one throttling
Channel, one end of the centre bore are located at the outer surface of the valve ball, the other end of the centre bore and the throttling passage
It is connected with the through-hole, the flow area of the throttling passage is much smaller than the flow area of the centre bore, and the section
Flow area of the flow area of circulation road also much smaller than the through-hole.
The throttling passage is connected with through-hole constitutes a fan shape structure, and wherein covering of the fan is the through-hole, and fan handle is institute
Throttling passage is stated, the throttling passage and through-hole are all located at the axial direction of the centre bore, and the through-flow face of the through-hole
Flow area of the product less than or equal to the centre bore.
The throttling passage include be relatively distant from the through-hole first part and second of the relatively close through-hole
Point, wherein the width of the first part is equal, the width of the second part is arranged in gradually increase, and described second
Divide and is less than the width close to the throughhole portions in the width close to the first part part.
The second part is provided with the portion of being smoothly connected with the through-hole coupling part.
A groove is provided between the throttling passage and centre bore, the flow area of the groove is much larger than the section
The flow area of circulation road.
The centre of sphere of the median plane of the throttling passage, the center line of the centre bore and the valve ball is located at same flat
Face.
It is more than the internal diameter of the second channel close to the outer surface length of the entity part of the valve ball of the throttling passage,
When the outer surface of the entity part seals the second channel, the motor-driven valve is in full off state, and at this time described first
Not being connected between interface and second interface；
When at least part of the throttling passage and at least part of the through-hole are all mutually be overlapped with the second channel
When folded, motor-driven valve is in the quick variable condition of flow；
When the through-hole and the second channel overlap, the motor-driven valve is shown in a fully open operation at this time.
When at least part of the throttling passage overlaps with the second channel, the through-hole is logical not with described second
When road overlaps, the motor-driven valve is in throttle, passes through the throttling between the first interface and second interface at this time
Channel overlaps with the second channel to be partly connected, and the change of fluid curve under the throttle includes at least one section
Straight line.
Change of fluid curve under the throttle include at least two sections of straight lines or including at least one section of straight line and
At least one section of curve.
It is described in the rotation process of the valve ball during the full off state is switched to the throttle
Motor-driven valve is first kept for certain time enter back into throttle in full off state；The rotation of the valve ball under the throttle
Angular range accounts for the 30%~40% of the total rotational angle range of the valve ball.
Said electric valve may be implemented first interface and is connected to second interface by throttling passage and/or centre bore, pass through
The rotation for controlling valve ball reaches bidirectional throttle, big flow all-pass and the flowing control of fully closed fluid.
Description of the drawings
Fig. 1 is that the partial cutaway view schematic of the motor-driven valve of one embodiment of the invention is intended to.
Fig. 2 is the valve ball dimensional structure diagram of motor-driven valve shown in Fig. 1.
Fig. 3 is the schematic front view of valve ball shown in Fig. 2.
Fig. 4 is the schematic cross-sectional view of valve ball shown in Fig. 2.
Fig. 5 is the schematic cross-sectional view under close valve state of motor-driven valve shown in Fig. 1.
Fig. 6 is the schematic cross-sectional view under throttle opening state of motor-driven valve shown in Fig. 1.
Fig. 7 is the schematic cross-sectional view under the quick variable condition of flow of motor-driven valve shown in Fig. 1.
Fig. 8 is the schematic cross-sectional view under full-gear of motor-driven valve shown in Fig. 1.
Fig. 9 is the flow changing curve schematic diagram of motor-driven valve shown in Fig. 1.
Specific implementation mode
Technical scheme of the present invention is illustrated with reference to the accompanying drawings and detailed description, the up time described in this specification
What the term positions such as needle were illustrated according to the corresponding orientation relationship in position relation in attached drawing or figure.
As shown in Figure 1, motor-driven valve includes valve body 1, the valve ball 2 that is placed in valve body 1, with valve ball 2 connect and drives
The valve rod 4 that valve ball 2 acts, and the plug screw 3 for fixed spool ball 2.
As shown, valve body 1 is provided with the spool chamber 22 for housing valve ball 2 and can be connected with spool chamber 22
First interface 11.The one end open of spool chamber 22, plug screw 3 are set to the open end of spool chamber 22, plug screw 3 and spool chamber 22
The corresponding inner thread in open end is fixedly connected.Plug screw 3 is provided with the second interface 31 that can be connected with spool chamber 22.
The first valve seat 51 and the second valve seat 52 are additionally provided in valve body 1, the first valve seat 51 is provided through the first valve seat
51 first passage 53, the second valve seat 52 are provided through the second channel 54 of the second valve seat 52.Wherein the first valve seat 51 is opposite
Be connected with first interface 11 close to first interface 11 and first passage 53,54 relatively close second interface 31 of second channel and with
Second interface 31 is connected.
First valve seat 51 and the second valve seat 52 are slidably matched with valve ball 2, the first valve seat 51 and the second valve seat 52 and spool
Ball 2 matches the mating surface that part is provided with arcuation.
In order to improve leakproofness, sealing ring 6 can be set between the first valve seat 51 and valve body 1, it can also be in the second valve
Sealing ring 6 is set between seat 52 and valve body 1, reduces interior leakage, to improve control accuracy.It is pointed out here that valve seat and sealing
Circle can also be made of one structure, and the part that is in contact with valve body is made of sealing material, and the part that is in contact with valve ball is then by valve
Seat material is made.
As shown in Fig. 2, valve ball 2 is a chondritic, valve ball 2 is provided with and 4 matched card slot 24 of valve rod, spool
Ball 2 is additionally provided with centre bore 21, throttling passage 22 and through-hole 23, and wherein centre bore 21 and the extended surface of card slot 24 is perpendicular.In
The one end in heart hole 21 is located at the outer surface of valve ball 2, and the other end of centre bore 21 is connected with throttling passage 22 and through-hole 23.Section
The flow area of circulation road 22 is far smaller than the flow area of centre bore 21, and the flow area of throttling passage 22 is far smaller than
The flow area of through-hole 23.
As shown in Figure 3 and Figure 4, in the present embodiment, throttling passage 22 and through-hole 23 constitute a fan shape structure, middle fan
Face is through-hole 23, and fan handle is throttling passage 22.Throttling passage 22 and through-hole 23 are all located at the axial direction of centre bore 21, and lead to
The flow area in hole 23 is less than or equal to the flow area of centre bore 21, and such set-up mode processing is simple.
As shown in Figure 3 and Figure 4, throttling passage 22 includes first part 221 and second part 222, wherein first part 221
Width it is equal, the width of second part 222 is arranged in gradually increasing, and second part 222 is close to first part 221
The width divided is less than the width close to 23 part of through-hole.It can make two-part fluid flow variation under this setup not
Together, it is oblique to be less than the fluid flow variation under 222 section of second part for the fluid flow variation slope under 221 section of first part
Rate.It is pointed out here that throttling passage 22 can also be arranged to equal in width or the different part of multiple change width amplitudes.
It is smoothly connected between second part 222 and through-hole 23, on the one hand can reduce flow resistance loss, on the other hand also can
Reduce noise.
As shown in figure 3, be also provided with a groove 24 between throttling passage 22 and centre bore 21, groove 24 it is through-flow
Flow area road of the area also much larger than throttling passage 22.This setup can reduce noise by the way that turbulent region is arranged.
It is here noted that throttling passage 22 can be made of a plurality of throttling passage.The width specific size of throttling passage 22
It is then determined by system, is not specifically limited here, when one timing of traffic requirement, width is smaller, and the length of throttling passage 22 is bigger,
Fluid flow variation is also more smooth, so that the flow control accuracy of motor-driven valve is also higher.
In order to be accurately controlled fluid flow, the median plane of throttling passage 22, the center line and spool of centre bore 21
The centre of sphere of ball 2 can be generally aligned in the same plane.This structure can be the cooperation between valve ball and valve seat it is simple, it is interior leakage it is small, and
And and control accuracy simple for the control of fluid flow is high.
Fig. 5 to Fig. 8 shows that the action change procedure of the present embodiment motor-driven valve, Fig. 9 show the present embodiment motor-driven valve
Flow changing curve.As shown in figure 8, the fluid flow control of the motor-driven valve of the present embodiment includes four parts：Fully closed, linear change
Section (i.e. restriction portion), quickly variation section and standard-sized sheet.
Outer surface length close to the entity part 25 of the valve ball of the throttling passage 22 is more than the second channel
Internal diameter, as shown in figure 4, motor-driven valve is in full off state, the outer surface of the entity part 25 of valve ball 2 seals first passage 53
With second channel 54, at this time the communicating passage between first interface 11 and second interface 31 be truncated.
When motor-driven valve rotates clockwise certain angle to position as shown in Figure 5 from full off state shown in fig. 5, at this time
At least part of throttling passage 22 overlaps with second channel 54, and through-hole 23 does not overlap with second channel 54, motor-driven valve
In throttle.Since the width of throttling passage 22 is much smaller than the internal diameter of 21 sum of centre bore, such throttling passage 22 and second
Channel 54 overlap part for fluid by the way that throttling can be played the role of, pass through section between first interface 11 and second interface 31
Circulation road 22 overlaps with second channel 54 to be partly connected.As valve ball rotates, throttling passage 22 and 54 phase of second channel
The area of lap gradually increases.When first part 221 and the overlapping of second channel 54, the discord second channel of second part 222
When 54 overlapping, the changes in flow rate of fluid changes linearly, and is conducive to control throttle opening in this way, improves the throttle opening of motor-driven valve
Precision.When first part 221 and the overlapping of second channel 54, second part 222 are also overlapped with second channel 54, the stream of fluid
It measures amplitude of variation to increase, can quickly reach the effect of big flow throttling.It is pointed out here that the fluid under throttle
Change curve can also include at least two sections of straight lines or include at least one section of straight line and at least one section of curve.
From fig. 6 it can be seen that either first interface 11 is used as import, valve ball as import or second interface 31
2 rotational action is the same, and can realize convection current body segment flow control.
When motor-driven valve rotates clockwise certain angle to position as shown in Figure 7 from full off state shown in fig. 5, at this time
At least part of throttling passage 22 and at least part of through-hole 23 all overlap with second channel 54, and motor-driven valve is at this time
The quick variable condition of flow.Since the flow area of through-hole 23 is larger, in this regional extent, fluid flow is from the small of restriction portion
Changes in flow rate starts changes in flow rate amplitude and quickly becomes larger.It is pointed out here that the part in this stage can also be used as restriction portion,
When especially big flow throttles.
When motor-driven valve rotates clockwise certain angle to position as shown in Figure 8 from full off state shown in fig. 5, at this time
Throttling passage 22 and through-hole 23 all overlaps with second channel 54 or through-hole 23 all overlaps with second channel 54,
At this time by fluid flow it is maximum, motor-driven valve is shown in a fully open operation.
When motor-driven valve such as Fig. 5 to Fig. 8 are from the fully closed action change procedure to standard-sized sheet, pass through the fluid stream quantitative change of motor-driven valve
It is as shown in Figure 9 to change curve.As shown in figure 9, during from full off state to throttle, valve ball needs to rotate certain angle
Degree, i.e., motor-driven valve first keeps a period of time close valve state to enter back into throttle in the rotation process of valve ball, advantageous in this way
Switching between state is also beneficial to danger of leaking out in reduction.
Meanwhile the rotational angle range of throttle bottom spool ball account for the total rotational angle range of valve ball 30%~
40%, for example, total rotational angle range of valve ball is 0~90 ° in the present embodiment, the angle of rotation of throttle bottom spool ball
Ranging from 5 °~36 ° of degree.This setup can make smaller (the i.e. linear change section in Fig. 9 of the changes in flow rate amplitude of fluid
Slope is relatively small), fluid flow control is also more accurate.
It is pointed out here that the rotational angle range of restriction portion can be set by controlling the width size of throttling passage
It sets, when width is relatively small, the rotational angle range of restriction portion is larger, when width is relatively large, the angle of rotation of restriction portion
It is smaller to spend range.
The above is only specific embodiments of the present invention, is not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the disclosure above technology contents to technical solution of the present invention
Many possible changes and modifications are made, or are revised as the equivalent embodiment of equivalent variations.Therefore, every without departing from skill of the present invention
The content of art scheme, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent variations and repair
Decorations, still fall within technical solution of the present invention protection in the range of.
Claims (10)
1. a kind of motor-driven valve, including valve body, be placed in the valve body valve ball, connect with the valve ball valve rod, with
And plug screw, the motor-driven valve are provided with first interface, second interface, first passage and second channel, are also set in the valve body
It is equipped with the first valve seat and the second valve seat, the first passage is set to first valve seat, and the second channel is set to described
Second valve seat, wherein the relatively close first interface of the first valve seat and first passage is connected with the first interface
It is logical, the relatively close second interface of the second channel and it is connected with the second interface；
It is characterized in that, the valve ball is provided with and the matched card slot of the valve rod, centre bore, through-hole and at least one section
Circulation road, one end of the centre bore are located at the outer surface of the valve ball, and the other end of the centre bore and the throttling are logical
Road is connected with the through-hole, and the flow area of the throttling passage is much smaller than the flow area of the centre bore, and described
Flow area of the flow area of throttling passage also much smaller than the through-hole.
2. motor-driven valve according to claim 1, which is characterized in that the throttling passage is connected with through-hole constitutes a fan
Shape structure, wherein covering of the fan are the through-hole, and fan handle is the throttling passage, and the throttling passage and through-hole are all located at the center
The axial direction in hole, and the flow area of the through-hole is less than or equal to the flow area of the centre bore.
3. motor-driven valve according to claim 2, which is characterized in that the throttling passage includes being relatively distant from the through-hole
The second part of first part and the relatively close through-hole, wherein the width of the first part is equal, the second part
Width be arranged in gradually increasing, and the second part is less than in the width close to the first part part close to described
The width of throughhole portions.
4. motor-driven valve according to claim 3, which is characterized in that the second part is arranged with the through-hole coupling part
It is smoothly connected portion.
5. motor-driven valve according to claim 4, which is characterized in that be provided with one between the throttling passage and centre bore
Groove, the flow area of the groove are much larger than the flow area throttling passage throttling passage of the throttling passage.
6. motor-driven valve according to any one of claims 1 to 5, which is characterized in that the median plane of the throttling passage, described
The center line of centre bore and the centre of sphere of the valve ball are generally aligned in the same plane.
7. motor-driven valve according to claim 6, which is characterized in that close to the entity part of the valve ball of the throttling passage
Outer surface length be more than the second channel internal diameter, when the outer surface of the entity part seals the second channel,
The motor-driven valve is in full off state, at this time not being connected between the first interface and second interface；
When at least part of the throttling passage and at least part of the through-hole all overlap with the second channel,
Motor-driven valve is in the quick variable condition of flow；
When the through-hole and the second channel overlap, the motor-driven valve is shown in a fully open operation at this time.
8. motor-driven valve according to claim 7, which is characterized in that when at least part and described of the throttling passage
When two channels overlap, the through-hole does not overlap with the second channel, the motor-driven valve is in throttle, described at this time
It is overlapped with the second channel by the throttling passage between first interface and second interface and is partly connected, in the section
Change of fluid curve under stream mode includes at least one section of straight line.
9. motor-driven valve according to claim 8, which is characterized in that the change of fluid curve under the throttle is at least
Including two sections of straight lines or include at least one section of straight line and at least one section of curve.
10. motor-driven valve according to claim 9, which is characterized in that be switched to the throttle from the full off state
In the process, in the rotation process of the valve ball, the motor-driven valve is first kept for certain time enter back into throttling in full off state
State；The rotational angle range of the valve ball accounts for the 30% of the total rotational angle range of the valve ball under the throttle
~40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710211150.0A CN108662187A (en) | 2017-03-31 | 2017-03-31 | A kind of motor-driven valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710211150.0A CN108662187A (en) | 2017-03-31 | 2017-03-31 | A kind of motor-driven valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108662187A true CN108662187A (en) | 2018-10-16 |
Family
ID=63784155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710211150.0A Pending CN108662187A (en) | 2017-03-31 | 2017-03-31 | A kind of motor-driven valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108662187A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110127503A (en) * | 2019-06-12 | 2019-08-16 | 兖州煤业股份有限公司 | New Buffering auxiliary shaft cage chair device |
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|---|---|---|---|---|
| JPH07167313A (en) * | 1993-12-16 | 1995-07-04 | Asahi Organic Chem Ind Co Ltd | Ball valve |
| CN2883820Y (en) * | 2006-02-27 | 2007-03-28 | 张忠巧 | Flow regulatable spool of ball valve |
| CN201696649U (en) * | 2010-06-13 | 2011-01-05 | 武汉格莱特控制阀有限公司 | Micro flow control ball valve |
| CN104132158A (en) * | 2013-05-02 | 2014-11-05 | 刘海亮 | Modular-design rotating type forced seal control valve |
| CN104653806A (en) * | 2015-02-05 | 2015-05-27 | 宁波日安阀门有限公司 | Electric linear ball valve with opening degree and flow rate linear relationship |
| US20150377365A1 (en) * | 2013-10-08 | 2015-12-31 | Jdv Control Valves Co., Ltd | Valve apparatus |
| CN205155216U (en) * | 2015-11-02 | 2016-04-13 | 浙江永盛科技股份有限公司 | Adjustable flow ball valve |
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2017
- 2017-03-31 CN CN201710211150.0A patent/CN108662187A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07167313A (en) * | 1993-12-16 | 1995-07-04 | Asahi Organic Chem Ind Co Ltd | Ball valve |
| CN2883820Y (en) * | 2006-02-27 | 2007-03-28 | 张忠巧 | Flow regulatable spool of ball valve |
| CN201696649U (en) * | 2010-06-13 | 2011-01-05 | 武汉格莱特控制阀有限公司 | Micro flow control ball valve |
| CN104132158A (en) * | 2013-05-02 | 2014-11-05 | 刘海亮 | Modular-design rotating type forced seal control valve |
| US20150377365A1 (en) * | 2013-10-08 | 2015-12-31 | Jdv Control Valves Co., Ltd | Valve apparatus |
| CN104653806A (en) * | 2015-02-05 | 2015-05-27 | 宁波日安阀门有限公司 | Electric linear ball valve with opening degree and flow rate linear relationship |
| CN205155216U (en) * | 2015-11-02 | 2016-04-13 | 浙江永盛科技股份有限公司 | Adjustable flow ball valve |
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| Title |
|---|
| 唐晓寅: "《工程流体力学》", 31 August 2007, 重庆大学出版社（重庆） * |
| 李国豪等: "《中国土木建筑百科辞典：建筑设备工程》", 31 May 1999, 中国建筑工业出版社（北京） * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110127503A (en) * | 2019-06-12 | 2019-08-16 | 兖州煤业股份有限公司 | New Buffering auxiliary shaft cage chair device |
| CN110127503B (en) * | 2019-06-12 | 2024-03-12 | 兖矿能源集团股份有限公司 | Novel buffering auxiliary well cradle device |
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