CN205876839U - Proportion overflow choke valve - Google Patents
Proportion overflow choke valve Download PDFInfo
- Publication number
- CN205876839U CN205876839U CN201620839430.7U CN201620839430U CN205876839U CN 205876839 U CN205876839 U CN 205876839U CN 201620839430 U CN201620839430 U CN 201620839430U CN 205876839 U CN205876839 U CN 205876839U
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- valve
- oil
- main
- guide
- pressure difference
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Abstract
The utility model discloses a proportion overflow choke valve through pressure differential feedback valve barrel and the structure that main valve core mutually supported, has realized the interconverting of between overflow mode and throttle mode. When main oil inlet oil pressure is greater than main oil -out, valve body work in overflow mode, when main oil inlet oil pressure is less than main oil -out, valve body work in throttle mode. The automatic switch -over of realize overflow mode and throttle mode is changed through the pressure differential feedback operating pressure differential that the valve barrel received. The utility model overcomes prior art's is not enough, provides a proportion overflow choke valve, can make the valve body switch mutually between overflow valve and choke valve structure through regulating and control pressure differential, makes the more nimble practicality of use of valve body.
Description
Technical field
This utility model relates to a kind of pressure control valve, particularly to a kind of proportional overflow choke valve.
Background technology
Overflow valve is pressure control valve conventional in hydraulic system, can be as the level pressure overflow setting up system working pressure
Valve or system is played the relief valve of safeguard protection effect.Existing commercially available domestic and international proportional pressure control valve and common overflow valve product,
The organization plan used is always as far back as the pilot operated compound relief valve of American scholar Harry.Vickers design in 1936, and the later stage has
Overflow valve is studied by a lot of experts and scholars, but the main organization plan of overflow valve is not changed in substantially.
Choke valve is dependent on the size changing valve port flow area and hinders to change liquid, controls the flow by valve, reaches to adjust
The purpose of joint executive component (hydraulic cylinder or hydraulic motor) movement velocity.In prior art, overflow valve and choke valve are at hydraulic pressure system
System is two pressure control valves independently, each plays overflow voltage regulation function and throttle grverning function, also there is no one
Overflow and throttling function can be integrated into the structure on a valve.
Utility model content
The purpose of this utility model is to overcome the deficiency of prior art, it is provided that a kind of proportional overflow choke valve, passes through
Regulation and control pressure reduction can make valve body switch mutually between overflow valve and throttle-valve structure, and the use making valve body is the most flexible practical.
This utility model solves its technical problem the technical scheme is that proportional overflow choke valve, including main valve body,
Main valve plug, pilot valve, pilot valve, Pressure difference feedback valve pocket, the first elastic component and the second elastic component, described valve body has master
Valve pocket and guide's valve pocket；
Having main valve chamber, main oil-in and main oil-out in described main valve body, described Pressure difference feedback valve pocket is set in described
Main valve chamber, and this main valve chamber is divided into the most disconnected first cavity volume and the second cavity volume；Described guide valve blocks has pilot valve
Chamber, guide's oil-in and guide's oil-out；Described Pressure difference feedback valve pocket is set in described main valve chamber movably, and by main valve chamber
Being divided into the first cavity volume disconnected with each other and the second cavity volume, described main valve plug is set in described second cavity volume movably；Institute
Stating and be provided with cavity inside main valve plug, the top of this main valve plug has the restriction in the interior outside of connection main valve plug, the end of this main valve plug
Portion is provided with the oil-through hole of up/down perforation；
Described Pressure difference feedback valve pocket is offseted by the inwall elasticity of described first elastic component with described first cavity volume, this pressure
Difference feedback valve pocket elasticity blocks described restriction；Described main valve plug is by described second elastic component and described Pressure difference feedback valve pocket
Elasticity offsets, and this main valve plug elasticity blocks described main oil-in；
Described guide valve blocks has guide's valve pocket, guide's oil-in and a guide's oil-out, described guide's valve pocket and described the
Pressure feedback through hole it is provided with between one cavity volume；Described pilot valve is mobilizable is socketed on described guide's valve pocket, described pilot valve
By changing position, the flow area of described guide's valve pocket can be changed.
Preferred as one, described guide's valve pocket attaching proportional electric magnet component, this proportion electro-magnet component passes through one
Push rod effect and described pilot valve, and change the oil pressure of pilot valve intracavity by changing power output.
Preferred as one, described main valve chamber attaching has displacement detecting control, described displacement detecting control and described pressure reduction
Feedback valve set is connected, and measures the position of this Pressure difference feedback valve pocket.
Preferred as one, described pressure feedback through hole is provided with the first damping piece.
Preferred as one, described pressure feedback through hole is provided with female thread, and described guide valve blocks is provided with and connects with described
The installation screwed hole that hole site is corresponding.
Preferred as one, described guide's oil-in is provided with the second damping piece.
Preferred as one, described Pressure difference feedback valve pocket includes circular top wall and jatharapanvartanasana perisporium, when described Pressure difference feedback
When the circular top wall of valve pocket and described main valve plug offset, described jatharapanvartanasana perisporium blocks the restriction of described main valve plug；Described master
When the spacing of spool and described Pressure difference feedback valve pocket increases, the flow area of described restriction increases.
Preferred as one, the front end of described pilot valve is taper, and guide's valve pocket has circular restriction, when described elder generation
The tapered front end of guide valve core is matched with this circle restriction movably, and along with the movement of pilot valve position, and change and be somebody's turn to do
The flow area of circular restriction.
Described restriction shape can be right-angled formula, needle valve, centering type, axial slit gap type, circumference clearance type, square
Shape, trapezoidal, triangle or U-shaped.
Described pilot valve can be side valve type pilot stage, cone valve type pilot stage or nozzle baffle type pilot stage.
Preferred as one, described first elastic component and the second elastic component are elastomeric spring.
In general, had the advantages that by the technical scheme that this utility model is contemplated
(1) this utility model can realize overflow and throttling function integration, and forward flow realizes overflow valve function, reversely
Flowing realizes throttle functionality, makes the function of overflow valve and choke valve be combined, changes the overflow valve continuing up use
And throttle-valve structure, by overflow and throttling function integration, main have employed the list of main valve plug-Pressure difference feedback valve pocket-main valve housing
The organization plan of spool bivalve set.By the operting differential pressure (pressure between main oil-in and main oil-out suffered by Pressure difference feedback valve pocket
Difference) change the automatic switchover realizing overflow pattern and throttle pattern.
When oil inlet and outlet pressure reduction is in certain threshold value, main inlet pressure is more than main oil-out, and now main valve plug is opened, joint
Head piece is closed, and Pressure difference feedback valve pocket is pressed on main valve plug, and utility model works is under overflow pattern；Pressure when oil inlet and outlet
When difference exceedes certain threshold value, main inlet pressure is less than main oil-out, and utility model works, under throttle pattern, is now led
Spool is closed, and Pressure difference feedback valve pocket moves up relative to main valve plug, fluid reverse flow, and throttle orifice is opened, and is operated in joint
Stream mode.More intelligent than the control mode such as manual, electric, mechanical by pressure reduction automatic switchover mode of operation.
(2) this utility model can realize proportion adjustment overflow pattern and the switching threshold of throttle pattern, passing ratio electromagnetism
Ferrum component, can control the oil pressure of described pilot valve intracavity, and the oil pressure of guide's valve pocket is by oil pressure feedback channel transmission to the most described the
One cavity volume, the change that the oil pressure difference between the i.e. first cavity volume and the second cavity volume occurs, the most described Pressure difference feedback valve pocket pressure experienced
Changing, the switching threshold between overflow pattern and throttle pattern changes.
Below in conjunction with drawings and Examples, this utility model is described in further detail；But ratio of the present utility model is overflow
Flow throttle valve is not limited to embodiment.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present utility model；
Fig. 2 is the structural representation of Pressure difference feedback valve pocket of the present utility model；
Fig. 3 is the structural representation of main valve plug of the present utility model；
Fig. 4 is the structural representation of main valve body of the present utility model；
Fig. 5 is the action schematic diagram one of main valve of the present utility model；
Fig. 6 is the action schematic diagram two of main valve of the present utility model；
Fig. 7 is the action schematic diagram one of pilot valve of the present utility model；
Fig. 8 is the action schematic diagram two of pilot valve of the present utility model.
Wherein: 1-main valve body, 11-the first cavity volume, 12 second cavity volumes, the main oil-in of 13-, the main oil-out of 14-；
2-guide valve blocks, 21-guide's oil-in, 22-guide's oil-out, 23-pressure feedback through hole, 24-installs screwed hole,
25-the first antivibrator, 26-the second antivibrator, 27-guide's valve pocket, 271-pilot valve set oil-in, 272-pilot valve set is fuel-displaced
Mouthful；
3-main valve plug, 31-oil-through hole, 32-restriction；
4-pilot valve, 41-tapered end；
5-Pressure difference feedback valve pocket；
6-the first elastic component；
7-the second elastic component；
8-displacement transducer；
9-proportion electro-magnet component.
Detailed description of the invention
Embodiment:
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing to this reality
It is further elaborated with novel.Should be appreciated that instantiation figure described herein is only in order to explain that this practicality is new
Type, is not used to limit this utility model.Additionally, involved by each embodiment of this utility model disclosed below
Just can be mutually combined as long as technical characteristic does not constitutes conflict each other.
Seeing shown in Fig. 1 to Fig. 4, proportional overflow choke valve of the present utility model, including main valve body, main valve plug 3, guide
Valve, pilot valve 4, Pressure difference feedback valve pocket the 5, first elastic component 6 and the second elastic component 7, described valve body have main valve chamber and
Guide's valve pocket.
Having main valve chamber, main oil-in 13 and main oil-out 14 in described main valve body, described Pressure difference feedback valve pocket 5 is set in
Described main valve chamber, and this main valve chamber is divided into the most disconnected first cavity volume 11 and the second cavity volume 12；Described guide valve blocks 2 has
There are guide's valve pocket, guide's oil-in 21 and guide's oil-out 22；Described Pressure difference feedback valve pocket 5 is set in described main valve movably
Chamber, and main valve chamber is divided into the first cavity volume 11 and the second cavity volume 12 disconnected with each other, described main valve plug 3 is set with movably
In described second cavity volume 12；Described main valve plug 3 is internal is provided with cavity, and the top of this main valve plug 3 has outside in connection main valve plug 3
Restriction 32, the bottom of this main valve plug 3 is provided with the oil-through hole 31 of up/down perforation；Described Pressure difference feedback valve pocket 5 is by described the
One elastic component 6 offsets with the inwall elasticity of described first cavity volume 11, and this Pressure difference feedback valve pocket 5 is elastic blocks described restriction
32；Described main valve plug 3 is offseted with described Pressure difference feedback valve pocket 5 elasticity by described second elastic component 7, and this main valve plug 3 is elastic
Block described main oil-in 13.
Described guide valve blocks 2 has guide's valve pocket, guide's oil-in 21 and guide's oil-out 22, described guide's valve pocket and institute
State and be provided with pressure feedback through hole 23 between the first cavity volume 11；Described pilot valve 4 is mobilizable is socketed on described guide's valve pocket, described
Pilot valve 4, by changing position, can change the flow area of described guide's valve pocket, and then change the oil pressure of pilot valve intracavity.
Described guide's valve pocket attaching proportional electric magnet 9 component, this proportion electro-magnet component 9 acts on institute by a push rod
State pilot valve 4, and change the oil pressure of pilot valve intracavity by changing power output.
Described main valve chamber attaching has displacement detecting control, described displacement detecting control and the attaching of described Pressure difference feedback valve pocket 5
Together, and measure the position of this Pressure difference feedback valve pocket 5.
Described pressure feedback through hole 23 is provided with the first damping piece.
Described guide's oil-in 21 is provided with the second damping piece.
Described pressure feedback through hole 23 is provided with female thread, and described guide valve blocks 2 is provided with corresponding with described intercommunicating pore position
Installation screwed hole 24.
Described Pressure difference feedback valve pocket 5 includes circular top wall and jatharapanvartanasana perisporium, when the circular top of described Pressure difference feedback valve pocket 5
When wall and described main valve plug 3 offset, described jatharapanvartanasana perisporium blocks the restriction 32 of described main valve plug 3；Described main valve plug 3 and institute
When stating the spacing increase of Pressure difference feedback valve pocket 5, the flow area of described restriction 32 increases.
The front end of described pilot valve 4 is taper, forms cone match with described pilot valve set oil-in 271, and along with
The movement of pilot valve 4 position, and change the flow area of fluid.
Described restriction 32 shape can be right-angled formula, needle valve, centering type, axial slit gap type, circumference clearance type,
Rectangle, trapezoidal, triangle or U-shaped.
Described pilot valve can be side valve type pilot stage, cone valve type pilot stage or nozzle baffle type pilot stage.
Described first elastic component 6 and the second elastic component 7 are elastomeric spring.
Below in conjunction with accompanying drawing 5 to 8 explanation operation principle of the present utility model:
After hydraulic oil enters guide's valve pocket along guide's oil-in 21, overcome the thrust of proportion electro-magnet 9, open pilot valve
4, guide's oil-out 22 flow out, and flow back to fuel tank.Being set with pilot valve set 27 in described guide valve blocks 2, guide's valve pocket 27 has
Having the cylindrical chamber run through, the bottom side of this cylindrical chamber constitutes guide's valve pocket 27 oil-in 271, and the right side of this cylindrical chamber is offered
There is through pilot valve set oil-out 272.The tapered end of described guide valve blocks 2 is movable with described pilot valve set oil-in 271
Coordinate, and passing ratio electric magnet 9 is adjusted position.When pilot valve 4 moves up, fluid flowing also damps second
Produce pressure drop on device 26, cause the oil pressure of pilot valve intracavity to decline.The oil pressure of pilot valve intracavity is conducted by pressure feedback channel
The first cavity volume 11 to main valve chamber body, pressure feedback channel is provided with the first antivibrator 25, and it is as dynamic antivibration, can increase
The stability of valve when main valve plug 3 and Pressure difference feedback valve pocket 5 position transient changing, reduces impact.
The main oil-in 13 of described main valve body is connected with system oil-way, described main oil-out 14 and oil sump tank or certain
Pressure unit is connected.Pressure suffered by described main valve plug 3 is, the pressure reduction between main oil-in 13 and main oil-out 14 is produced
Pressure and spring force.Pressure suffered by described Pressure difference feedback valve pocket 5 is, the pressure reduction between the first cavity volume 11 and main oil-in 13
Produced pressure and spring force.
Pressure difference feedback valve pocket 5 force analysis, it is assumed that Impact direction is just upwards, then what Pressure difference feedback valve pocket 5 was subject to makes a concerted effort
For:
FFeedback valve pocket=p1A1+p2A2+Fs1-p3(A1+A2)-Fs2
Wherein, p1It is the oil pressure of main oil-in, p2It is the oil pressure of main oil-out, p3It it is the oil pressure of the first cavity volume 11；A1For institute
State the area of Pressure difference feedback valve pocket 5 and main valve plug 3 inner chamber opposite segments, A2Outside described Pressure difference feedback valve pocket 5 and main valve plug 3
The area of opposite segments, A1+A2It is the upper surface area of Pressure difference feedback valve pocket 5；Fs1It is that the first elastic component is to Pressure difference feedback
The elastic force of valve pocket 5, Fs2It it is second elastic component elastic force to Pressure difference feedback valve pocket 5.
When then Pressure difference feedback valve pocket 5 is in equilbrium position, meet FFeedback valve pocket=0, and due to p3+pc=p1(pCFor p1With p3It
Between difference constant, the second antivibrator 26 determined), therefore the stress expression formula of equilbrium position can be reduced to:
It it is a constant on the right of equation.
1) when main oil-in 13 pressure p1With main oil-out 14 pressure p2Pressure reduction meet:
Time, in certain threshold value, Pressure difference feedback valve pocket 5 stress is downward, restriction
32 remain turned-off, and are operated in overflow pattern.The oil pressure p of the main oil-in of proportion electro-magnet 9 controllable1, and then change oil pressure relief.
2) when main oil-in 13 pressure p1With main oil-out 14 pressure p2Pressure reduction meet:
Time, in certain threshold value, Pressure difference feedback valve pocket 5 moves up, and opens joint
Head piece 32, is operated in throttle pattern.The oil pressure p of the main oil-in of proportion electro-magnet 9 controllable1, and then control Pressure difference feedback valve pocket 5
Position, regulates restriction 32 aperture size.
Hereinafter, work process of the present utility model is divided into throttle pattern and overflow pattern illustrate.
Overflow pattern:
Proportion electro-magnet 9 produces certain thrust in pilot valve 4 one end；When pressure oil acts on pilot valve 4
When the hydraulic coupling of the other end is less than the thrust of proportion electro-magnet 9, pilot valve 4 can not be opened；First antivibrator 25 and the second resistance
Buddhist nun's device 26 does not has fluid to pass through；Pressure difference feedback valve pocket 5 mutually snaps together with described main valve plug 3, and restriction 32 is closed；Because of master
Pressure reduction between oil-in 13 and main oil-out 14 is not enough, and overfall is also switched off (main oil-out 14 is the most fuel-displaced).
Along with oil pressure raises, when the pressure reduction of main oil-out 14 with main oil-in 13 reaches certain threshold value, pressure oil overcomes
The thrust of proportion electro-magnet 9, pilot valve 4 opens, and pressure oil is entered by the cavity volume between pilot valve 4 and guide's valve pocket 27
Guide's oil return opening 22；Guide's fluid produces pressure drop through the second antivibrator 26, causes guide's chamber pressure to reduce；Pressure difference feedback valve
Overlap 5 epicoeles to be communicated by the first antivibrator 25 with guide's cavity volume, therefore Pressure difference feedback valve pocket 5 upper cavity pressure also reduces.Under this condition, pressure
Under difference feedback valve pocket 5 cavity of resorption pressure reduction thereon and spring-force driven dual, mutually snap together with described main valve plug 3, restriction 32
Still close.Pressure difference feedback valve pocket the 5, second elastic component 7 and main valve plug 3 move on the whole, and overfall is opened, it is achieved overflow (oil
Liquid flows out from main oil-out 14). by regulating the electromagnetic force of proportion electro-magnet 9, regulate and control guide's chamber pressure, main oil-feed can be changed
Mouth 13 pressure, and then realize the pressure proportional regulation in hydraulic circuit.
Throttle pattern:
When the pressure reduction of main oil-out 14 and main oil-in 13 is in certain threshold value, utility model works is in throttle pattern.
Now, guide's fluid overcomes proportion electro-magnet 9 thrust, makes pilot valve 4 open, and guide oil liquid stream produces through the second antivibrator 26
Pressure drop, guide's chamber pressure reduces, and then changes feedback valve pocket 5 upper cavity pressure；Main valve plug 3 is under hydraulic coupling and spring-force driven dual
It is in lower end and closes overfall；Pressure difference feedback valve pocket 5 main oil-in 13, main oil-out 14 pressure reduction and the first elastic component 6,
Two elastic components 7 jointly act on disengaging main valve plug 3 to move up and open restriction 32, and liquid passes through throttling from main oil-out 14
Mouth 32 enters main valve plug 3 inner chambers, is then passed through oilhole 31 and realizes the functions such as throttle grverning in main oil-in 13 flows to working connection.
By regulating the electromagnetic force of proportion electro-magnet 9, regulate and control guide's chamber pressure, control orifice 32 aperture, it is achieved ratio throttle power
Energy.Detected Pressure difference feedback valve pocket 5 displacement by displacement transducer 8 and feed back to the input of proportional amplifier, thus ensureing valve
Stable state accuracy, is operated in throttle pattern.
Above-described embodiment is only used for further illustrating proportional overflow choke valve of the present utility model, the technical staff of the industry
It will be appreciated that this utility model is not restricted to the described embodiments, described in above-described embodiment and description, this reality is simply described
By novel principle, on the premise of without departing from this utility model spirit and scope, this utility model also have various change and
Improving, these changes and improvements are all in the range of claimed this utility model.
Claims (9)
1. proportional overflow choke valve, it is characterised in that: include main valve body, main valve plug, pilot valve, pilot valve, Pressure difference feedback valve
Set, the first elastic component and the second elastic component, described valve body has main valve chamber and guide's valve pocket；
Having main valve chamber, main oil-in and main oil-out in described main valve body, described Pressure difference feedback valve pocket is set in described main valve
Chamber, and this main valve chamber is divided into the most disconnected first cavity volume and the second cavity volume；Described guide valve blocks has guide's valve pocket, elder generation
Lead oil-in and guide's oil-out；
Described Pressure difference feedback valve pocket is set in described main valve chamber movably, and main valve chamber is divided into disconnected with each other first
Cavity volume and the second cavity volume, described main valve plug is set in described second cavity volume movably；It is provided with cavity inside described main valve plug, should
The top of main valve plug has the restriction in the interior outside of connection main valve plug, and the bottom of this main valve plug is provided with the oil-through hole of up/down perforation；
Described Pressure difference feedback valve pocket is offseted by the inwall elasticity of described first elastic component with described first cavity volume, this Pressure difference feedback valve
Set elasticity blocks described restriction；Described main valve plug is by described second elastic component and described Pressure difference feedback valve pocket elasticity phase
Supporting, this main valve plug elasticity blocks described main oil-in；
Described guide valve blocks has guide's valve pocket, guide's oil-in and guide's oil-out, and described guide's valve pocket holds with described first
Pressure feedback through hole it is provided with between chamber；Described pilot valve is mobilizable is socketed on described guide's valve pocket.
Proportional overflow choke valve the most according to claim 1, it is characterised in that: described guide's proportional electromagnetism of valve pocket attaching
Ferrum component, this proportion electro-magnet component acts on described pilot valve by a push rod, and changes elder generation by changing power output
The oil pressure of pilot valve intracavity.
Proportional overflow choke valve the most according to claim 1, it is characterised in that: described main valve chamber attaching has displacement detecting control
Part, described displacement detecting control is connected with described Pressure difference feedback valve pocket, and measures the position of this Pressure difference feedback valve pocket.
Proportional overflow choke valve the most according to claim 1, it is characterised in that: described pressure feedback through hole is provided with the first resistance
Damping member.
Proportional overflow choke valve the most according to claim 3, it is characterised in that: described pressure feedback through hole is provided with interior spiral shell
Stricture of vagina, and described guide valve blocks is provided with the installation screwed hole corresponding with described intercommunicating pore position.
Proportional overflow choke valve the most according to claim 1, it is characterised in that: described guide's oil-in is provided with the second damping
Part.
Proportional overflow choke valve the most according to claim 1, it is characterised in that: described Pressure difference feedback valve pocket includes circular top
Wall and jatharapanvartanasana perisporium, when the circular top wall of described Pressure difference feedback valve pocket offsets with described main valve plug, described jatharapanvartanasana perisporium
Block the restriction of described main valve plug；When the spacing of described main valve plug and described Pressure difference feedback valve pocket increases, described restriction
Flow area increases.
Proportional overflow choke valve the most according to claim 1, it is characterised in that: the front end of described pilot valve is taper,
Guide's valve pocket has circular restriction, when the tapered front end of described pilot valve is matched with this circle restriction movably, and
Along with the movement of pilot valve position, and change the flow area of this circle restriction.
Proportional overflow choke valve the most according to claim 1, it is characterised in that: described first elastic component and the second elasticity
Component is elastomeric spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620839430.7U CN205876839U (en) | 2016-08-04 | 2016-08-04 | Proportion overflow choke valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620839430.7U CN205876839U (en) | 2016-08-04 | 2016-08-04 | Proportion overflow choke valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205876839U true CN205876839U (en) | 2017-01-11 |
Family
ID=57700918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620839430.7U Withdrawn - After Issue CN205876839U (en) | 2016-08-04 | 2016-08-04 | Proportion overflow choke valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205876839U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089833A (en) * | 2016-08-04 | 2016-11-09 | 华侨大学 | A kind of proportional overflow choke valve |
| CN108278234A (en) * | 2018-01-17 | 2018-07-13 | 邵立坤 | Plug-in rotary buffering valve |
-
2016
- 2016-08-04 CN CN201620839430.7U patent/CN205876839U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089833A (en) * | 2016-08-04 | 2016-11-09 | 华侨大学 | A kind of proportional overflow choke valve |
| CN108278234A (en) * | 2018-01-17 | 2018-07-13 | 邵立坤 | Plug-in rotary buffering valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170111 Effective date of abandoning: 20180824 |