CN110332319A - A kind of butterfly valve with body structure - Google Patents
A kind of butterfly valve with body structure Download PDFInfo
- Publication number
- CN110332319A CN110332319A CN201910706106.6A CN201910706106A CN110332319A CN 110332319 A CN110332319 A CN 110332319A CN 201910706106 A CN201910706106 A CN 201910706106A CN 110332319 A CN110332319 A CN 110332319A
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- China
- Prior art keywords
- handle
- disk body
- fan shape
- shape disk
- section
- 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
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- 230000008878 coupling Effects 0.000 claims abstract description 47
- 238000010168 coupling process Methods 0.000 claims abstract description 47
- 238000005859 coupling reaction Methods 0.000 claims abstract description 47
- 230000000694 effects Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 abstract description 15
- 238000010586 diagram Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/221—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves specially adapted operating means therefor
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a kind of butterfly valves with body structure.A kind of butterfly valve with body structure, including butterfly valve body, butterfly valve plate, disk body positioning convex platform, disc spring, disk body are fan shape disk body, and enclosing the facade that fan shape disk body two are mutually perpendicular to the facade other end is arc surface；The fan shape disk body for being provided with annular slotted hole and axis hole is fixedly mounted on disk body positioning convex platform on top surface using bolt；Handle is that one section of end of coupling part is mounted on upper shaft on the part on fan shape disk body axis hole using disc spring；It further include handle rotating limit device and handle rotation fine tuning positioning device.The present invention easily realizes the control to fluid flow, but also easily realizes and accurately control to fluid flow, also easily realizes and accurately controls to fluid flow fine tuning requirement.
Description
Technical field
The invention belongs to a kind of butterfly valves, especially belong to a kind of butterfly valve with body structure.
Background technique
Handle butterfly valve is a kind of simple regulating valve of structure, is widely used in the industry such as petroleum, coal gas, chemical industry, water process
Field.Handle butterfly valve is usually made of handle, fluted disc, valve body and valve plate, and fluted disc is coaxially mounted between handle and valve body, handle
It is co-axially mounted with the intracorporal spool of valve.The rotation of spool is realized by rotating handle, to control the flow of liquid.But hand
The handle and fluted disc of handle butterfly valve are unable to satisfy lock function mostly, cannot achieve micro-regulation liquid flow requirement, can not accurately control
The flow of liquid.How can easily realize control of the handle butterfly valve to fluid flow, how can easily realize to liquid flow
Amount accurately controls, and how can easily realize that accurately controlling for fluid flow fine tuning requirement be problem to be solved.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of butterfly valve with body structure.Disk body is had using this
The butterfly valve of structure can easily realize the control to fluid flow, can easily realize and accurately control to fluid flow, energy side
Just realization accurately controls fluid flow fine tuning requirement.
The technical solution that the present invention solves above-mentioned technical problem is: a kind of butterfly valve with body structure, including butterfly valve valve
Body, butterfly valve plate, disk body, upper shaft, handle, the butterfly valve body has top flange, it is characterized in that: further including disk body convex
Platform, disc spring, the disk body positioning convex platform, which has, matches threaded hole with butterfly valve body top flange hole, which uses
Threaded hole and bolt are fixedly connected with butterfly valve body；The disk body is fan shape disk body, and there are two mutually for fan shape disk body tool
The facade of vertical and one end intersection, the fan shape disk body two are mutually perpendicular to the arc-shaped structure in position of facade one end intersection, enclose
The facade that hinge shape disk body two is mutually perpendicular to the facade other end is arc surface；The fan shape disk body is circular arc close to its facade
It is provided with annular slotted hole in the top side location in face, which is mutually perpendicular to the arc-shaped knot in facade one end close to two
Axis hole is additionally provided on the position of structure；The fan shape disk body for being provided with annular slotted hole and axis hole is fixedly mounted on disk body using bolt
On positioning convex platform on top surface；The handle has two sections of dislocation parallel sections of integrally formed two sections of dislocation parallel sections and connection
Vertical portion, one section of have two sections dislocation parallel sections of the handle is coupling part, and another section is portion of the handle, handle
The upper shaft is mounted on the part on fan shape disk body axis hole using disc spring for one section of end of coupling part；Also
Including handle rotating limit device and handle rotation fine tuning positioning device；
The handle rotating limit device is 2 pairs of square head bolts, and successively fan shape disk body top is installed in activity to 2 pairs of square head bolts
On the annular slotted hole of face setting, 2 pairs of square head bolts on activity installation fan shape disk body top surface annular slotted hole are located at handle
For one section of the two sides in coupling part；
The handle rotation fine tuning positioning device is that fan shape disk body is successively arc-shaped in annular slotted hole top side location
At least 11 location holes and handle being arranged are the positioning column of the one section of bottom surface in coupling part setting, and handle is one section of coupling part
At least 11 location holes of positioning column and the fan shape disk body top surface of bottom surface setting successively arc-shaped setting match, fine tuning turn
Fixed handle, the handle can be inserted into fan shape disk body top surface for the positioning column of the one section of bottom surface in coupling part setting respectively and successively be in
At least 11 positioning holes of arc setting realize handle rotation fine tuning positioning；
Being mounted on handle of the upper shaft on part on fan shape disk body axis hole using disc spring is one section of coupling part
It is one section of coupling part rest part bottom surface in angle structure positioned at the bottom surface of disc spring left part and the handle, handle is
One section of coupling part is located at the bottom surface of disc spring left part and the handle is that one section of coupling part rest part bottom surface is vertical
The angle in section is 10-12 °.
Use process of the invention is: needing to open the requirement of butterfly valve plate aperture according to control fluid flow, using simultaneously
2 pairs of square head bolts for rotating fixed handle rotating limit device, one section by handle for coupling part is limited in rotational angle,
The rotational angle of the one section of restriction in handle coupling part is set to need to open butterfly valve plate opening angle with according to control fluid flow
It is consistent；When the fluid flow of control, which needs to finely tune, needs to finely tune butterfly valve plate aperture, lifting handle is portion of the handle
Another section, due to handle be one section of coupling part end using disc spring be mounted on the upper shaft across fan shape disk body axis hole it
On part on, and handle is that one section of coupling part is located at the bottom surface of disc spring left part and the handle is coupling part one
Section rest part bottom surface is in angle structure, can easily lift another section that handle is portion of the handle, handle is coupling part
The positioning column of one section of bottom surface setting is detached from the location hole of fan shape disk body top surface setting, and rotational handle is the another of portion of the handle
Section, handle drive upper shaft rotation, realize the requirement of fine tuning butterfly valve plate aperture, fall another section that handle is portion of the handle,
By disc spring compressing force, handle is that the positioning column of the one section of bottom surface setting in coupling part is inserted into determining for fan shape disk body top surface setting
Handle rotation fine tuning positioning is realized in the hole of position.
The beneficial effects of the present invention are: disk body positioning convex platform has since the present invention is provided with disk body positioning convex platform, disc spring
Threaded hole is matched with butterfly valve body top flange hole, disk body positioning convex platform connects using threaded hole and bolt and butterfly valve body are fixed
It connects；Disk body is fan shape disk body；Fan shape disk body is provided with annular slotted hole in the top side location that its facade is arc surface, fans
Axis hole is additionally provided on the position that shape disk body top surface is mutually perpendicular to the arc-shaped structure in facade one end close to two；It is provided with annular
The fan shape disk body of slot and axis hole is fixedly mounted on disk body positioning convex platform on top surface using bolt；Handle is interconnecting piece
The one section of end divided is mounted on the upper shaft on the part on fan shape disk body axis hole using disc spring；It further include handle
Rotating limit device and handle rotation fine tuning positioning device.The present invention easily realizes the control to fluid flow, but also
It easily realizes and fluid flow is accurately controlled, also easily realize and fluid flow fine tuning requirement is accurately controlled.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples；
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is assembling schematic diagram of the present invention；
Fig. 3 is the structural schematic diagram of handle of the present invention；
Fig. 4 be the present invention according to control fluid flow need to open 90 ° of butterfly valve plate aperture require when structural schematic diagram；
In attached drawing: 1. butterfly valve bodies, 2. butterfly valve plates, 3. upper shafts, 4. handles, 5. disk body positioning convex platforms, 6. disc springs, 7.
Fan shape disk body, 71. arc surfaces, 8. annular slotted holes, 9. axis holes, 41. coupling parts, 42. portion of the handle, 10. square head bolts,
11. location hole, 12. positioning columns.
Specific embodiment
Below by specific embodiment, the present invention is described in further detail.
Embodiment 1
As shown in Figure 1, Figure 2, Figure 3, Figure 4, a kind of butterfly valve with body structure, including butterfly valve body 1, butterfly valve plate 2,
Disk body, upper shaft 3, handle 4, the butterfly valve body 1 has top flange, it is characterized in that: further including disk body positioning convex platform 5, disc spring
6, the disk body positioning convex platform 5, which has, matches threaded hole with butterfly valve body top flange hole, which uses screw thread
Hole and bolt are fixedly connected with butterfly valve body 1；The disk body is fan shape disk body 7, and there are two mutually hang down for the fan shape disk body 7 tool
The facade of straight and one end intersection, the fan shape disk body 7 two are mutually perpendicular to the arc-shaped structure in position of facade one end intersection, enclose
Fan shape disk body 7 two facades for being mutually perpendicular to the facade other end are arc surface 71；The fan shape disk body 7 is circle close to its facade
Annular slotted hole 8 is provided in the top side location of cambered surface 71, which is mutually perpendicular to facade one end close to two and is in
Axis hole 9 is additionally provided on the position of arcuate structure；The fan shape disk body for being provided with annular slotted hole 8 and axis hole 9 is fixed using bolt
It is mounted on disk body positioning convex platform 5 on top surface；The handle 4 has two sections of integrally formed two sections of dislocation parallel sections and connection
One section of the vertical portion for the parallel section that misplaces, two sections of dislocation parallel sections which has is coupling part 41, Ling Yiduan
For portion of the handle 42, handle 4 is that one section of end of coupling part 41 is mounted on the upper shaft 3 across fan shape using disc spring 6
On part on disk body axis hole 9；It further include handle rotating limit device and handle rotation fine tuning positioning device；
The handle rotating limit device is 2 pairs of square head bolts, 10,2 pairs of square head bolts 10 successively activity installation fan shape disk
On the annular slotted hole 8 of 7 top surface of body setting, 2 pairs of square head bolts 10 on activity installation 7 top surface annular slotted hole 8 of fan shape disk body divide
Not Wei Yu handle 4 be 41 1 sections of coupling part two sides；
It is successively in arc in 8 top side location of annular slotted hole that the handle rotation fine tuning positioning device, which is fan shape disk body 7,
11 location holes 11 and handle 4 of shape setting are the positioning column 12 of the 41 1 sections of bottom surfaces in coupling part setting, and handle 4 is interconnecting piece
11 location holes 11 of the positioning column 12 of point 41 1 sections of bottom surfaces setting and 7 top surface of fan shape disk body successively arc-shaped setting match
It closes, fine-adjustment rotary handle 4, the handle 4 is that the positioning column 12 of the 41 1 sections of bottom surfaces in coupling part setting can be inserted into sector respectively
Handle rotation fine tuning positioning is realized in 11 location holes 11 of 7 top surface of shape disk body successively arc-shaped setting；
Being mounted on handle 4 of the upper shaft 3 on part on fan shape disk body axis hole 9 using disc spring 6 is coupling part
41 1 sections of bottom surfaces for being located at 6 left part of disc spring and the handle 4 are the bottom surface of the 41 1 sections of rest parts in coupling part in folder
Corner structure, the handle 4 is the 41 1 sections of bottom surfaces for being located at 6 left part of disc spring in coupling part and the handle 4 is coupling part
The angle of 41 1 sections of rest part bottom surface vertical cross-sections is 10 °, and (observer faces the utility model, is handle on the left of observer
One section of coupling part is located at the left part of disc spring).
Embodiment 2
As shown in Figure 1, Figure 2, Figure 3, Figure 4, a kind of butterfly valve with body structure, including butterfly valve body 1, butterfly valve plate 2,
Disk body, upper shaft 3, handle 4, the butterfly valve body 1 has top flange, it is characterized in that: further including disk body positioning convex platform 5, disc spring
6, the disk body positioning convex platform 5, which has, matches threaded hole with butterfly valve body top flange hole, which uses screw thread
Hole and bolt are fixedly connected with butterfly valve body 1；The disk body is fan shape disk body 7, and there are two mutually hang down for the fan shape disk body 7 tool
The facade of straight and one end intersection, the fan shape disk body 7 two are mutually perpendicular to the arc-shaped structure in position of facade one end intersection, enclose
Fan shape disk body 7 two facades for being mutually perpendicular to the facade other end are arc surface 71；The fan shape disk body 7 is circle close to its facade
Annular slotted hole 8 is provided in the top side location of cambered surface 71, which is mutually perpendicular to facade one end close to two and is in
Axis hole 9 is additionally provided on the position of arcuate structure；The fan shape disk body for being provided with annular slotted hole 8 and axis hole 9 is fixed using bolt
It is mounted on disk body positioning convex platform 5 on top surface；The handle 4 has two sections of integrally formed two sections of dislocation parallel sections and connection
One section of the vertical portion for the parallel section that misplaces, two sections of dislocation parallel sections which has is coupling part 41, Ling Yiduan
For portion of the handle 42, handle 4 is that one section of end of coupling part 41 is mounted on the upper shaft 3 across fan shape using disc spring 6
On part on disk body axis hole 9；It further include handle rotating limit device and handle rotation fine tuning positioning device；
The handle rotating limit device is 2 pairs of square head bolts, 10,2 pairs of square head bolts 10 successively activity installation fan shape disk
On the annular slotted hole 8 of 7 top surface of body setting, 2 pairs of square head bolts 10 on activity installation 7 top surface annular slotted hole 8 of fan shape disk body divide
Not Wei Yu handle 4 be 41 1 sections of coupling part two sides；
It is successively in arc in 8 top side location of annular slotted hole that the handle rotation fine tuning positioning device, which is fan shape disk body 7,
11 location holes 11 and handle 4 of shape setting are the positioning column 12 of the 41 1 sections of bottom surfaces in coupling part setting, and handle 4 is interconnecting piece
11 location holes 11 of the positioning column 12 of point 41 1 sections of bottom surfaces setting and 7 top surface of fan shape disk body successively arc-shaped setting match
It closes, fine-adjustment rotary handle 4, the handle 4 is that the positioning column 12 of the 41 1 sections of bottom surfaces in coupling part setting can be inserted into sector respectively
Handle rotation fine tuning positioning is realized in 11 location holes 11 of 7 top surface of shape disk body successively arc-shaped setting；
Being mounted on handle 4 of the upper shaft 3 on part on fan shape disk body axis hole 9 using disc spring 6 is coupling part
41 1 sections of bottom surfaces for being located at 6 left part of disc spring and the handle 4 are the bottom surface of the 41 1 sections of rest parts in coupling part in folder
Corner structure, the handle 4 is the 41 1 sections of bottom surfaces for being located at 6 left part of disc spring in coupling part and the handle 4 is coupling part
The angle of 41 1 sections of rest part bottom surface vertical cross-sections is 12 °, and (observer faces the utility model, is handle on the left of observer
It is located at the left part of disc spring for one section of coupling part).
Through the above description, those skilled in the art completely can be in the model without departing from this invention technical idea
In enclosing, various changes and amendments are carried out all within protection scope of the present invention.Unaccomplished matter of the invention, belongs to ability
The common knowledge of field technique personnel.
Claims (1)
1. a kind of butterfly valve with body structure, including butterfly valve body, butterfly valve plate, disk body, upper shaft, handle, the butterfly valve
Valve body has top flange, it is characterized in that: further including disk body positioning convex platform, disc spring, the disk body positioning convex platform has and butterfly valve valve
Body top flange hole matches threaded hole, which is fixedly connected using threaded hole and bolt with butterfly valve body；It is described
Disk body is fan shape disk body, and there are two the facade being mutually perpendicular to and one end is intersected, the fan shape disk bodies two for fan shape disk body tool
A arc-shaped structure in position for being mutually perpendicular to the intersection of facade one end, encloses fan shape disk body two and is mutually perpendicular to the facade other end
Facade is arc surface；The fan shape disk body is provided with annular slotted hole in the top side location that its facade is arc surface, the sector
Axis hole is additionally provided on the position that shape disk body top surface is mutually perpendicular to the arc-shaped structure in facade one end close to two；It is provided with annular groove
The fan shape disk body of hole and axis hole is fixedly mounted on disk body positioning convex platform on top surface using bolt；The handle have one at
The vertical portion of two sections of dislocation parallel sections of two sections of dislocation parallel sections and connection of type, two sections of dislocation which has are parallel
Partial one section is coupling part, and another section is portion of the handle, and handle is that one section of end of coupling part is mounted on using disc spring
The upper shaft passes through on the part on fan shape disk body axis hole；It further include handle rotating limit device and handle rotation fine tuning
Positioning device；
The handle rotating limit device is 2 pairs of square head bolts, and successively activity installation fan shape disk body top surface is set 2 pairs of square head bolts
On the annular slotted hole set, 2 pairs of square head bolts on activity installation fan shape disk body top surface annular slotted hole are located at handle to connect
The two sides of one section of socket part point；
The handle rotation fine tuning positioning device is the successively arc-shaped setting in annular slotted hole top side location of fan shape disk body
At least 11 location holes and handle be the setting of the one section of bottom surface in coupling part positioning column, handle is one section of coupling part bottom
At least 11 location holes of positioning column and the fan shape disk body top surface of face setting successively arc-shaped setting match, fine-adjustment rotary hand
Handle, the handle are that be inserted into fan shape disk body top surface respectively successively arc-shaped for the positioning column of the one section of bottom surface in coupling part setting
At least 11 positioning holes being arranged realize handle rotation fine tuning positioning；
Being mounted on handle of the upper shaft on part on fan shape disk body axis hole using disc spring is that one section of coupling part is located at
The bottom surface of disc spring left part and the handle are that the bottom surface of the one section of rest part in coupling part is in angle structure, and handle is to connect
One section of the socket part point bottom surface for being located at disc spring left part, which is that one section of coupling part rest part bottom surface is vertical with the handle, to be cut
The angle in face is 10-12 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910706106.6A CN110332319A (en) | 2019-08-01 | 2019-08-01 | A kind of butterfly valve with body structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910706106.6A CN110332319A (en) | 2019-08-01 | 2019-08-01 | A kind of butterfly valve with body structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110332319A true CN110332319A (en) | 2019-10-15 |
Family
ID=68148257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910706106.6A Pending CN110332319A (en) | 2019-08-01 | 2019-08-01 | A kind of butterfly valve with body structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110332319A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0914494A (en) * | 1995-04-27 | 1997-01-14 | Tomoe Gijutsu Kenkyusho:Kk | Driving device for butterfly valve and its manufacture |
| CN203477348U (en) * | 2013-08-09 | 2014-03-12 | 天津市莱斯特阀门有限公司 | Rubber-hung butterfly valve capable of being accurately controlled |
| KR20140036959A (en) * | 2012-09-17 | 2014-03-26 | 플로우콘 인터내셔날 에이피에스 | A detachable handle for adjusting a valve and an assembly comprising a detachable handle and a valve |
| CN105443793A (en) * | 2014-08-29 | 2016-03-30 | 天津市易泰柯自动控制设备有限公司 | Novel manual ball valve |
| CN207261676U (en) * | 2017-09-05 | 2018-04-20 | 世通金属制品（天津）股份有限公司 | A kind of butterfly valve |
| CN210290790U (en) * | 2019-08-01 | 2020-04-10 | 济南迈克阀门科技有限公司 | Butterfly valve with disk body structure |
-
2019
- 2019-08-01 CN CN201910706106.6A patent/CN110332319A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0914494A (en) * | 1995-04-27 | 1997-01-14 | Tomoe Gijutsu Kenkyusho:Kk | Driving device for butterfly valve and its manufacture |
| KR20140036959A (en) * | 2012-09-17 | 2014-03-26 | 플로우콘 인터내셔날 에이피에스 | A detachable handle for adjusting a valve and an assembly comprising a detachable handle and a valve |
| CN203477348U (en) * | 2013-08-09 | 2014-03-12 | 天津市莱斯特阀门有限公司 | Rubber-hung butterfly valve capable of being accurately controlled |
| CN105443793A (en) * | 2014-08-29 | 2016-03-30 | 天津市易泰柯自动控制设备有限公司 | Novel manual ball valve |
| CN207261676U (en) * | 2017-09-05 | 2018-04-20 | 世通金属制品（天津）股份有限公司 | A kind of butterfly valve |
| CN210290790U (en) * | 2019-08-01 | 2020-04-10 | 济南迈克阀门科技有限公司 | Butterfly valve with disk body structure |
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