CN107956902A - Throttle valve - Google Patents
Throttle valve Download PDFInfo
- Publication number
- CN107956902A CN107956902A CN201711029599.1A CN201711029599A CN107956902A CN 107956902 A CN107956902 A CN 107956902A CN 201711029599 A CN201711029599 A CN 201711029599A CN 107956902 A CN107956902 A CN 107956902A
- Authority
- CN
- China
- Prior art keywords
- spool
- chamber
- valve body
- rubber seal
- 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.)
- Granted
Links
- 238000007789 sealing Methods 0.000 claims description 9
- 238000003032 molecular docking Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/243—Packings
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/34—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Sliding Valves (AREA)
Abstract
The present invention provides a kind of novel in structural design, the throttle valve of high sensitivity；It includes valve body, the spool being arranged in valve body；The runner through valve body is longitudinally equipped with valve body, a spool chamber is equipped with valve body, the one end open of spool chamber, its other end terminate in the middle part of valve body through runner, and enclosed slot is formed in valve body away from the blind end on spool chamber opening extreme direction；The spool is located in spool chamber, and a tail cap is equipped with the openend of the spool chamber, and the spool is threadedly coupled through tail cap and with tail cap；Spool end close to described enclosed slot one end is equipped with the first rubber seal, and the spool middle front part near first rubber seal is equipped with the second rubber seal, the first rubber seal and the second rubber seal interval setting.
Description
Technical field
Present invention relates particularly to a kind of throttle valve.
Background technology
Throttle valve be by varying throttling section or chock length to control the valve of fluid flow, it is existing referring to Fig. 1
Throttle valve is made of the spool in valve body and valve body, changes flow to the section of runner by varying spool.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, adapts to real needs, there is provided a kind of novel in structural design,
The throttle valve of high sensitivity.
In order to achieve the object of the present invention, the technical solution adopted in the present invention is：
A kind of throttle valve is designed, it includes valve body, the spool being arranged in valve body；The stream through valve body is longitudinally equipped with valve body
Road, valve body is interior to be equipped with a spool chamber, and the one end open of spool chamber, its other end terminate in the middle part of valve body through runner, away from valve
Blind end on core cavity opening extreme direction forms enclosed slot in valve body；The spool is located in spool chamber, and in valve body
The spool end in portion is inserted into enclosed slot；A tail cap is equipped with the openend of the spool chamber, the spool runs through tail cap
And it is threadedly coupled with tail cap；Spool end close to described enclosed slot one end is equipped with the first rubber seal, first rubber
Spool middle front part near glue sealing ring is equipped with the second rubber seal, first rubber seal and the second rubber seal
It is arranged at intervals, when the end of the spool, which is embedded in, to be closed in enclosed slot, first rubber seal is located at
In enclosed slot on the right side of oil duct, second rubber seal is located in the spool chamber on the left of oil duct.
Preferably, be made of positioned at the spool chamber on the left of oil duct the ante-chamber and tail chamber docked, the ante-chamber it is interior
Footpath is less than the junction composition step of the internal diameter of tail chamber, ante-chamber and tail chamber, and one is equipped with the middle part of the spool of the tail intracavitary
Annular retaining ring, the valve core upper sleeve between annular retaining ring and the step have spring.
Preferably, the spool in the ante-chamber is equipped with an endless groove, and the endless groove is located at the second rubber seal
Between circle and spring.
Preferably, the front edge of the spool is rounded structure.
Preferably, the enclosed slot open end circumferential edge on runner side wall is rounded structure.
The spool is equipped with two spaced annular recess, first rubber seal and the second rubber seal
Circle is respectively in corresponding annular recess.
The tail cap is threadedly coupled with the tail chamber.
Preferably, the runner and spool being arranged in valve body are two and are symmetrical arranged.
Preferably, throttling chamber in middle part is equipped between two runners, middle part throttles chamber as valve body middle part, and is located at valve
For the enclosed slot of two internal flow passage ends with middle part throttling chamber perforation, the runner positioned at valve body both sides passes through two envelopes
Locked groove penetrates through；Middle part throttling intracavitary is equipped with a push rod, and the open end of the middle part throttling chamber on body wall, which is equipped with, to be connected
Tail cap is connect, connection tail cap is threadedly coupled with middle part throttling chamber, and the push rod is connected tail cap screw thread company through connection tail cap and with this
Connect, the blind end away from the middle part throttling chamber on the throttling chamber open end direction of middle part forms closed pockets, and position in valve body
It is inserted into the push rod end of valve inner in closed pockets.
Preferably, the push rod positioned at middle part throttling intracavitary is equipped with sealing rubber ring, positioned at the push rod of valve inner
End edge is fillet, and the open end edge of closed pockets is fillet.
The beneficial effects of the present invention are：
The design its novel in structural design, high sensitivity, in use can exist the elastic force of spool by spring to avoid spool
Axial dipole field in valve body, improves the sensitivity of this throttle valve, secondly, this throttle valve sealing effect in completely closed state
Well, be not in oil leak, the phenomenon of permeability.
Brief description of the drawings
Fig. 1 is the structure diagram of existing throttle valve；
Fig. 2 is the cross-sectional view of the present invention；
Fig. 3 is A portions enlarged structure schematic diagram in Fig. 2；
Fig. 4 is another cross-sectional view of the present invention；
In figure：1st, 9. spool;2nd, 10. tail cap;3. annular retaining ring;4. the second rubber seal;5th, 8. runner;6. spool end;
7. enclosed slot;11. valve body;12. tail chamber;13. spring;14. endless groove;15. the first rubber seal;16. the front end edge of spool
Edge;17. enclosed slot open end circumferential edge;18. closed pockets;19. push rod end edge;20. the opening end edge of closed pockets
Edge;21. push rod;22. connect tail cap;23. sealing rubber ring.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples：
Embodiment 1：A kind of throttle valve, referring to Fig. 2, Fig. 3；It includes valve body 11, the spool 1 being arranged in valve body 11；Valve body 11
Upper longitudinal direction is equipped with the runner 5,8 that valve body 11 is run through in longitudinal direction, and spool chamber, the one end open of spool chamber, its other end are equipped with valve body
The middle part of valve body 11 is terminated in through runner, and enclosed slot 7 is formed in valve body away from the blind end on spool chamber opening extreme direction；
The spool 1 is located in spool chamber, and the spool end 6 inside valve body 11 is inserted into enclosed slot 7.
Further, a tail cap 2 is equipped with the openend of the spool chamber in the design, positioned in the left side of oil duct 5
The spool chamber is made of the ante-chamber and tail chamber 12 docked, and the tail cap is threadedly coupled with the tail chamber；The internal diameter of the ante-chamber
Less than the internal diameter of tail chamber, the junction of ante-chamber and tail chamber 12 forms step, and one is equipped with the middle part of the spool of the tail intracavitary
Annular retaining ring 3, the valve core upper sleeve between annular retaining ring and the step have spring 13, spool are applied by spring to outside
Thrust.
The spool 1 in the design is threadedly coupled through tail cap 2 and with tail cap 2；Valve close to described 7 one end of enclosed slot
Core end is equipped with the first rubber seal 15, and the spool middle front part near first rubber seal 15 is equipped with the second rubber
Sealing ring 4,15 and second rubber seal 4 of the first rubber seal are arranged at intervals, and the spool is equipped with two intervals
The annular recess of setting, first rubber seal and the second rubber seal are respectively in corresponding annular recess；When
The end of the spool 1 is embedded in when being closed in enclosed slot 7, and first rubber seal 15 is located on the right side of oil duct
Enclosed slot in, second rubber seal 4 is located in the spool chamber on the left of oil duct.
Further, the design is equipped with an endless groove also on the spool 1 in the ante-chamber, and the endless groove is located at
Between second rubber seal and spring, spool and the contact area inside spool chamber can be reduced by this endless groove, at the same time
It can reduce frictional force between the two, improve spool lightweight during exercise, flexibility.
Further, the front edge 16 of the spool in the design is rounded structure, meanwhile, on runner side wall
Enclosed slot open end circumferential edge 17 be also rounded structure, this two rounded structures can be carried compared to now rectangular design
Stability of the high spool when entering enclosed slot, avoids the end of spool from occurring occurring the phenomenon of interim card during radial deflection, meanwhile,
By the structure of this two fillets in the movement of spool, when face where the end of spool is in face where enclosed slot openend
Runner can be got through when on the same face, and existing right-angle design is so in closed state this state is former, this design can
To improve the sensitivity of this throttle valve, higher is suitable for low pressure oil way control.
As shown in the figure, the runner 5,8 and spool 1,9 that are arranged in valve body 1 are two and are symmetrical arranged.
When being closed, its spool end 6 enters in enclosed slot the throttle valve of the design, at this time, the first rubber
Glue sealing ring 15 is located in enclosed slot, and second rubber seal 4 is located in spool chamber, passes through the first rubber seal and
Two rubber seal 4 play good sealing effect, can avoid the occurrence of the generation of permeability phenomenon；And needing to open simultaneously runner
When throttling to it, rotary spool to release on the outside of valve body, reaches spool by cut-off area of the spool end to runner
To the purpose of throttling, state at this time can be found in state shown in Fig. 2, and at this time, spring applies elastic force to push rod, passes through the bullet of paralysis
Power can keep the stabilization of spool, avoid causing spool axial move occur because axial dipole field occurs in the screw thread that spool is connected with tail cap
It is dynamic（Displacement distance is 0.1-0.5mm）Cause choke pressure wild effect occur, can improve successively this throttle valve stability,
Accuracy and simple operation.
Embodiment 2, referring to Fig. 4, part same as Example 1 repeats no more, and difference is, throttle valve in the design
In two runners 5,8 between be equipped with a middle part and throttle chamber, middle part throttles chamber as the middle part of valve body 1, and in valve body
Two flow passage ends enclosed slot 7 with middle part throttling chamber perforation, the runner positioned at valve body both sides passes through two closings
Groove penetrates through；Middle part throttling intracavitary is equipped with a push rod 21, and the open end of the middle part throttling chamber on body wall, which is equipped with, to be connected
Tail cap 22 is connect, connection tail cap 22 is threadedly coupled with middle part throttling chamber, and the push rod through connection tail cap and is connected tail cap spiral shell with this
Line connects, and the blind end away from the middle part throttling chamber on the throttling chamber open end direction of middle part forms closed pockets in valve body
19, and be inserted into positioned at the push rod end of valve inner in closed pockets 18.
Likewise, the push rod in the design positioned at middle part throttling intracavitary is equipped with sealing rubber ring 23, positioned at valve body
Internal 19 edge of push rod end edge is fillet, and the open end edge 20 of closed pockets is also fillet.
The middle part throttling chamber of the design has following several purposes in use：
First, push rod is located in closed pockets and isolates two oil ducts, this throttle valve is used as binary channels throttle valve；
2nd, push rod is released out of closed pockets connects two oil ducts, and two oil ducts can increase by two as an oil duct, this mode
The total flow of a oil duct；
3rd, one of oil duct in two oil ducts is closed, and push rod is unloaded from valve body, and the output of single oil duct is changed into double oil
Road exports.
What the embodiment of the present invention was announced is preferred embodiment, but is not limited thereto, the ordinary skill people of this area
Member, easily according to above-described embodiment, understands the spirit of the present invention, and makes different amplification and change, but as long as not departing from this
The spirit of invention, all within the scope of the present invention.
Claims (10)
1. a kind of throttle valve, it includes valve body, the spool being arranged in valve body；The runner through valve body is longitudinally equipped with valve body,
A spool chamber is equipped with valve body, the one end open of spool chamber, its other end terminate in the middle part of valve body through runner, away from spool chamber
Blind end on opening extreme direction forms enclosed slot in valve body；The spool is located in spool chamber, and positioned at valve inner
Spool end is inserted into enclosed slot；It is characterized in that：A tail cap is equipped with the openend of the spool chamber, the spool passes through
Wear tail cap and be threadedly coupled with tail cap；Spool end close to described enclosed slot one end is equipped with the first rubber seal, described
Spool middle front part near first rubber seal is equipped with the second rubber seal, first rubber seal and the second rubber
Sealing ring is arranged at intervals, when the end of the spool, which is embedded in, to be closed in enclosed slot, first rubber seal
In the enclosed slot on the right side of oil duct, second rubber seal is located in the spool chamber on the left of oil duct circle.
2. throttle valve as claimed in claim 1, it is characterised in that：Positioned at the spool chamber on the left of oil duct by docking before
Chamber and tail chamber are formed, and the internal diameter of the ante-chamber is less than the junction composition step of the internal diameter of tail chamber, ante-chamber and tail chamber, positioned at described
An annular retaining ring is equipped with the middle part of the spool of tail intracavitary, the valve core upper sleeve between annular retaining ring and the step has spring.
3. throttle valve as claimed in claim 2, it is characterised in that：Spool in the ante-chamber is equipped with an endless groove,
The endless groove is between the second rubber seal and spring.
4. throttle valve as claimed in claim 1, it is characterised in that：The front edge of the spool is rounded structure.
5. throttle valve as claimed in claim 4, it is characterised in that：Enclosed slot open end circumferential edge on runner side wall
For rounded structure.
6. throttle valve as claimed in claim 2, it is characterised in that：It is recessed that the spool is equipped with two spaced ring-types
Groove, first rubber seal and the second rubber seal are respectively in corresponding annular recess.
7. throttle valve as claimed in claim 1, it is characterised in that：The tail cap is threadedly coupled with the tail chamber.
8. the throttle valve as described in claim 1 to 7 is any, it is characterised in that：The runner and spool being arranged in valve body be
Two and it is symmetrical arranged.
9. throttle valve as claimed in claim 8, it is characterised in that：Middle part throttling chamber, middle part are equipped between two runners
Enclosed slot of the chamber as two flow passage ends in the middle part of valve body, and in valve body throttle with middle part throttling chamber perforation, is located at
The runner of valve body both sides is penetrated through by two enclosed slots；Middle part throttling intracavitary is equipped with a push rod, on body wall
The open end of middle part throttling chamber is equipped with connection tail cap, and connection tail cap is threadedly coupled with middle part throttling chamber, and the push rod runs through
Connection tail cap is simultaneously connected tail cap threaded connection with this, the closing away from the middle part throttling chamber on the throttling chamber open end direction of middle part
End forms closed pockets in valve body, and is inserted into positioned at the push rod end of valve inner in closed pockets.
10. throttle valve as claimed in claim 9, it is characterised in that：It is equipped with positioned at the push rod of middle part throttling intracavitary close
Rubber ring is sealed, the push rod end edge positioned at valve inner is fillet, and the open end edge of closed pockets is fillet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711029599.1A CN107956902B (en) | 2017-10-27 | 2017-10-27 | Throttle valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711029599.1A CN107956902B (en) | 2017-10-27 | 2017-10-27 | Throttle valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107956902A true CN107956902A (en) | 2018-04-24 |
| CN107956902B CN107956902B (en) | 2024-05-03 |
Family
ID=61964171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711029599.1A Active CN107956902B (en) | 2017-10-27 | 2017-10-27 | Throttle valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107956902B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112135992A (en) * | 2018-05-07 | 2020-12-25 | 戴科知识产权控股有限责任公司 | Two position gate valve and spring gate valve with full flow open position and restricted flow open position |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2392423A (en) * | 1942-11-09 | 1946-01-08 | Hydraulic Control Engineering | Hydraulic control system |
| GB1415989A (en) * | 1973-05-31 | 1975-12-03 | Int Harvester Co | Valve spools |
| CN2234535Y (en) * | 1995-02-21 | 1996-09-04 | 陈志坚 | Piston type flow divider valve |
| US20010022196A1 (en) * | 2000-02-29 | 2001-09-20 | Ab Rexroth Mecman | Multiway valve with a removable exhaust wall |
| US20030140974A1 (en) * | 2002-01-31 | 2003-07-31 | Franz-Heinrich Suilmann | Pilot control valve |
| CN2660262Y (en) * | 2003-07-23 | 2004-12-01 | 上海华岛液压设备制造有限公司 | Overlapping two-way/one-way throttle |
| CN201297401Y (en) * | 2008-11-25 | 2009-08-26 | 姚香怡 | A piston valve |
| CN201687790U (en) * | 2010-05-25 | 2010-12-29 | 上海立新液压有限公司 | Superimposed flow valve |
| CN203614482U (en) * | 2013-10-14 | 2014-05-28 | 宁波明启液压机械有限公司 | Stacked bidirectional-unidirectional throttling valve |
| CN203770281U (en) * | 2014-04-18 | 2014-08-13 | 宁波市镇海华力液压机电有限公司 | Throttle valve |
| CN203770756U (en) * | 2014-04-18 | 2014-08-13 | 宁波市镇海华力液压机电有限公司 | One-way throttle valve |
| CN207470849U (en) * | 2017-10-27 | 2018-06-08 | 江西省唯欣高科精密五金有限公司 | Throttle valve |
-
2017
- 2017-10-27 CN CN201711029599.1A patent/CN107956902B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2392423A (en) * | 1942-11-09 | 1946-01-08 | Hydraulic Control Engineering | Hydraulic control system |
| GB1415989A (en) * | 1973-05-31 | 1975-12-03 | Int Harvester Co | Valve spools |
| CN2234535Y (en) * | 1995-02-21 | 1996-09-04 | 陈志坚 | Piston type flow divider valve |
| US20010022196A1 (en) * | 2000-02-29 | 2001-09-20 | Ab Rexroth Mecman | Multiway valve with a removable exhaust wall |
| US20030140974A1 (en) * | 2002-01-31 | 2003-07-31 | Franz-Heinrich Suilmann | Pilot control valve |
| CN1435577A (en) * | 2002-01-31 | 2003-08-13 | Dbt自动化有限公司 | Pilot-actuated valve |
| CN2660262Y (en) * | 2003-07-23 | 2004-12-01 | 上海华岛液压设备制造有限公司 | Overlapping two-way/one-way throttle |
| CN201297401Y (en) * | 2008-11-25 | 2009-08-26 | 姚香怡 | A piston valve |
| CN201687790U (en) * | 2010-05-25 | 2010-12-29 | 上海立新液压有限公司 | Superimposed flow valve |
| CN203614482U (en) * | 2013-10-14 | 2014-05-28 | 宁波明启液压机械有限公司 | Stacked bidirectional-unidirectional throttling valve |
| CN203770281U (en) * | 2014-04-18 | 2014-08-13 | 宁波市镇海华力液压机电有限公司 | Throttle valve |
| CN203770756U (en) * | 2014-04-18 | 2014-08-13 | 宁波市镇海华力液压机电有限公司 | One-way throttle valve |
| CN207470849U (en) * | 2017-10-27 | 2018-06-08 | 江西省唯欣高科精密五金有限公司 | Throttle valve |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112135992A (en) * | 2018-05-07 | 2020-12-25 | 戴科知识产权控股有限责任公司 | Two position gate valve and spring gate valve with full flow open position and restricted flow open position |
| CN112135992B (en) * | 2018-05-07 | 2022-11-01 | 戴科知识产权控股有限责任公司 | Two position gate valve and spring gate valve with full flow open position and restricted flow open position |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107956902B (en) | 2024-05-03 |
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