CN105909584A - Buffer overflow valve - Google Patents
Buffer overflow valve Download PDFInfo
- Publication number
- CN105909584A CN105909584A CN201610118759.9A CN201610118759A CN105909584A CN 105909584 A CN105909584 A CN 105909584A CN 201610118759 A CN201610118759 A CN 201610118759A CN 105909584 A CN105909584 A CN 105909584A
- Authority
- CN
- China
- Prior art keywords
- valve
- buffer
- discharge orifice
- cushion chamber
- spool
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/025—Pressure reducing valves
-
- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Safety Valves (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a buffer overflow valve which is provided with a first throttling orifice, a second throttling orifice and a third throttling orifice. Three buffer cavities, namely, a first buffer cavity, a second buffer cavity and a third buffer cavity, are formed. Through the step-by-step buffer role of the three buffer cavities, the process of pressure increase of a hydraulic system can be delayed, and too fast pressure increase is avoided. The buffer time can be adjusted by changing the sizes of the buffer cavities. In addition, by arranging a buffer piston on a valve rod, the valve is made smaller and more compact. Through the guiding role of the valve rod, abnormal wear of the valve core and the buffer piston in the moving process caused by eccentric clamping is reduced. Therefore, compared with the prior art, the buffer overflow valve disclosed by the invention has an enhanced buffer effect during instantaneous pressure rise or continuous pressure rise under the premise of achieving a buffer function, the wear of the valve core and the buffer piston is reduced, and the service life of the buffer overflow valve is increased.
Description
Technical field
The present invention relates to hydraulic transmission technology, be specifically related to a kind of buffer relief valve.
Background technology
Starting and in braking procedure in excavator walking, walking mechanism load transients rises relatively big, causes walking
In-house impact is relatively big, and parts wear is more serious.In order to reduce the negative effect that hydraulic shock brings,
Generally the appropriate location of hydraulic system install buffer relief valve, utilize buffer relief valve can suppress be
The pressure oscillation of system, and then reduce the fault rate of complete machine.Common buffer relief valve, buffer unit is whole
It is arranged on outside overflow valve pocket, directly bears compression shock, therefore easily cause buffer unit clamping stagnation and seriously grind
Damaging, the average life time making buffer unit is shorter, and simultaneous buffering device only moves generation by damper piston
Volume buffers, and buffering effect is the best, it is impossible to preferably plays the protective effect of buffering overflow, causes making
Shorter with the life-span.
Summary of the invention
In view of this, the present invention proposes a kind of buffer relief valve, and compared with prior art, this buffer-type overflows
Stream valve arrangement is reliable, and buffering effect is obvious.
The present invention proposes a kind of buffer relief valve, and it includes valve seat, valve body, spool, damper piston and answers
Position spring, described valve seat is provided with the first hydraulic fluid port, described valve body is provided with the second hydraulic fluid port and valve pocket, institute
Stating valve body and the fixing connection of valve seat, described spool and back-moving spring are arranged in valve pocket, and described spool includes
Valve head and valve rod, one end of described valve rod is connected with valve head, and its other end is connected with back-moving spring, described valve
Head is slidably connected with the inwall of valve pocket；First segment discharge orifice, second section discharge orifice and first it is provided with on described spool
Cushion chamber, first segment discharge orifice and second section discharge orifice lay respectively at the two ends of spool, and the first cushion chamber is by first segment
Discharge orifice connects with second section discharge orifice；Described damper piston is set on valve rod slidably, and damper piston
Periphery wall is slidably connected with the inwall of valve pocket, described damper piston valve pocket is divided into the second cushion chamber and
The 3rd throttle orifice it is provided with on 3rd cushion chamber, and described damper piston；Described first segment discharge orifice connects first
Hydraulic fluid port and the first cushion chamber, described second section discharge orifice connects the first cushion chamber and the second cushion chamber, and the described 3rd
Throttle orifice connects the second cushion chamber and the 3rd cushion chamber.
Preferably, described valve body includes valve body and regulation set, and one end of described valve body is connected with valve seat,
Its other end is threaded connection with regulation set；Described back-moving spring is arranged in regulation set.
Preferably, described regulation puts and is provided with adjusting rod, and described adjusting rod is threaded connection with regulation set,
And the inner of adjusting rod is positioned at regulation set, it is outside that its outer end extends to regulation set；Described back-moving spring away from
Spring base contact is passed through on the inner of adjusting rod in one end of spool.
Preferably, the diameter of described 3rd throttle orifice is less than first segment discharge orifice and the diameter of second section discharge orifice.
Preferably, described spool being provided with choke plug, described second section discharge orifice is arranged on described choke plug.
Preferably, being provided with the guiding annulus of convex in described valve pocket, described valve rod is slidably disposed through guiding
Annulus, described 3rd cushion chamber is guiding between annulus and damper piston.
Preferably, described guiding annulus is provided with multiple axially disposed opening, multiple described mistakes excessively
Opening is arranged around valve rod even circumferential.
Preferably, it is provided with predetermined gap between described guiding annulus and valve rod radial direction.
Preferably, described valve rod is provided with grading ring groove；And/or, described damper piston is provided with and all presses
Annular groove.
The buffer relief valve that the present invention proposes is provided with first segment discharge orifice, second section discharge orifice and the 3rd throttle orifice,
And define the first cushion chamber, the second cushion chamber and three cushion chambers of the 3rd cushion chamber, by three cushion chambers
Cushioning effect step by step, the process that hydraulic system pressure can be made to increase delays, and then avoids pressure liter to exceed
Hurry up, simultaneously can be by changing the size adjustment buffer time of cushion chamber.It addition, by damper piston is arranged
On valve rod, the volume that can make valve is less, more compact structure；The guide effect of valve rod, can reduce valve
The inordinate wear that in core and damper piston moving process, eccentric clamping stagnation causes.Therefore, compared with prior art,
The buffer relief valve that the present invention proposes, on the premise of realizing pooling feature, further enhancing pressure moment
Buffering effect when rising and persistently rise, reduces spool and the abrasion of damper piston, improves buffer-type and overflows
The life-span of stream valve.
Accompanying drawing explanation
The accompanying drawing of the part constituting the present invention is used for providing a further understanding of the present invention, and the present invention shows
Meaning property embodiment and explanation thereof are used for explaining the present invention, are not intended that inappropriate limitation of the present invention.At accompanying drawing
In:
The structural representation of the buffer relief valve that Fig. 1 provides for the specific embodiment of the invention；
The structural representation of the spool that Fig. 2 provides for the specific embodiment of the invention；
The structural representation of the valve body that Fig. 3 provides for the specific embodiment of the invention；
The structural representation of the regulation set that Fig. 4 provides for the specific embodiment of the invention；
The structural representation of the damper piston that Fig. 5 provides for the specific embodiment of the invention.
Description of reference numerals:
1 valve seat 2 valve body 3 spool 4 back-moving spring 5 regulation set
6 damper piston 7 adjusting rod 8 first locking nut 9 second locking nuts
10 first hydraulic fluid port 20 second hydraulic fluid port 21 second cushion chamber 22 the 3rd cushion chambers
23 guide annulus 24 crosses opening 31 valve rod 32 valve head
33 first segment discharge orifice 34 first cushion chamber 35 second section discharge orifice 36 choke plugs
61 the 3rd throttle orifices
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the present invention and the feature in embodiment
Can be mutually combined.The specific embodiment of 1 to 5 couple of present invention is described in detail below in conjunction with the accompanying drawings.
As it is shown in figure 1, the specific embodiment of the invention propose buffer relief valve include valve seat 1, valve body,
Spool 3, damper piston 6 and back-moving spring 4；Valve body includes valve body 2 and regulation set 5, and valve seat 1 sets
It is equipped with the first hydraulic fluid port 10, valve body 2 is provided with the second hydraulic fluid port 20, one end of valve body 2 and valve seat 1
Fixing connection, its other end and regulation set 5 are threaded connection, and valve body 2 is internally formed with regulation set 5
Valve pocket, spool 3 and back-moving spring 4 are arranged in valve pocket；As it is shown on figure 3, in being provided with on valve body 2
Convex guiding annulus 23, guides and is provided with multiple axially extended opening 24 excessively on annulus 23.
As in figure 2 it is shown, spool 3 includes valve head 32 and valve rod 31, valve head 32 is positioned at the left end of valve rod 31；
The periphery wall of valve head 32 is slidably connected with valve body 2, and valve head 32 end is provided with conical seal (contact) face, is used for
Block the first hydraulic fluid port 10；Back-moving spring 4 is arranged in regulation set 5, and valve rod 31 passes on valve body 2
Guide and be radially arranged predetermined gap, valve rod 31 between annulus 23, and valve rod 31 and guiding annulus 23
Right-hand member by spring base contact on the left end of back-moving spring 4, the active force of back-moving spring 4 orders about spool
3 move towards the first hydraulic fluid port 10；Spool 3 has been sequentially arranged first segment discharge orifice the 33, first cushion chamber
34 and second section discharge orifice 35, and first segment discharge orifice 33 is positioned on valve head 32, second section discharge orifice 35 is positioned at valve
The right-hand member of bar 31.
As it is shown in figure 1, damper piston 6 is set on valve rod 31 slidably, and the periphery of damper piston 6
Wall valve body 2 inwall slidably connects, and valve pocket is divided into the second cushion chamber 21 and the 3rd by damper piston 6
Cushion chamber 22, and on damper piston 6, it is provided with the 3rd throttle orifice 61；On buffer relief valve, first
Throttle orifice 33 connects the first hydraulic fluid port 10 and the first cushion chamber 34, and second section discharge orifice 35 connects the first cushion chamber
34 and second cushion chamber 21, the 3rd throttle orifice 61 connects the second cushion chamber 21 and the 3rd cushion chamber 22, and
The diameter of the 3rd throttle orifice 61 is less than first segment discharge orifice 33 and second section discharge orifice 35.
During application, the first hydraulic fluid port 10 connects high-pressure oil passage, and the second hydraulic fluid port 20 connects low pressure oil way；This buffering
The operation principle of formula overflow valve is: along with the pressure of high-pressure oil passage raises, the active force that spool 3 left end is subject to
During more than the resistance of right-hand member, spool 3 moves right, and the first hydraulic fluid port 10 connects with the second hydraulic fluid port 20, and then
High-pressure oil passage is carried out pressure release, the pressure relieving increase tendency of high-pressure oil passage, meanwhile, section hydraulic oil
The damping overcoming first segment discharge orifice 33 enters into the first cushion chamber 34, and the first cushion chamber 34 can accommodate part
Hydraulic oil, delays the trend that pressure increases further；Along with pressure continues to raise, hydraulic oil overcomes second section
The damping of discharge orifice 35 enters into the second cushion chamber 21, and the second cushion chamber 21 can accommodate a certain amount of hydraulic oil,
The trend that high-pressure oil passage pressure increases can also be delayed equally, under the effect of hydraulic oil, damper piston 6 to
Move left so that the second cushion chamber 21 volume increases, and then can accommodate more hydraulic oil, prolongs further
The increase tendency of slow pressure；Along with the pressure of high-pressure oil passage be stepped up and the second cushion chamber 21 pressure progressively
Increasing, when the stress of spool 3 right-hand member is more than left end stress, spool 3 is moved to the left, and orders about valve head 32
Closure is at the first hydraulic fluid port 10, and the pressure of final high-pressure oil passage is stepped up higher shape from relatively low state
State, spool 3 is being opened and in closing process, mobile slow, and damper piston 6 is slow in moving process,
Reduce the spool 3 produced because of quick washing and damper piston 6 offsets, reduce the abrasion of damper piston 6.
When the second hydraulic fluid port 20 connect high-pressure oil passage, the first hydraulic fluid port 10 connect low pressure oil way time, along with pressure increase
Greatly, hydraulic oil sequentially passes through opening 24, valve rod 31 and the gap guided between circle, enters into the 3rd
Cushion chamber 22, under the ordering about of hydraulic oil, damper piston 6 moves right；Along with pressure continues to increase, liquid
Force feed overcomes the damping of the 3rd throttle orifice 61, enters into the second cushion chamber 21, due to the 3rd throttle orifice 61
Effect, the pressure buildup in the 3rd cushion chamber 22 is slow, makes damper piston 6 slowly move right, and reduces slow
Rush the abrasion of piston 6.Along with pressure continues to increase, hydraulic oil enters the first cushion chamber through second section discharge orifice 35
34, and eventually pass through first segment discharge orifice 33 and flow to the first hydraulic fluid port 10.
Being appreciated that when pressure increases suddenly according to above-mentioned operation principle, the first cushion chamber 34, second delays
Rush chamber 21 and the 3rd cushion chamber 22 pass through receiving portion separatory force feed, thus slow down the rising of high-pressure oil passage pressure,
Meanwhile, spool 3, during pressure increases, carries out a certain degree of pressure release to high-pressure oil passage in good time so that
The increase of pressure more slows down.
By arrange guiding annulus 23 can ensure that spool 3 axially movable, and valve rod 31 with lead
Predetermined gap is set between annulus 23, it is possible to reduce valve rod 31 directly contacts with guide annulus 23, subtracts
Light abrasion.
In a preferred embodiment, valve body 2 is threaded connection with regulation set 5, rotary regulating sleeve 5,
Regulation set 5 relative valve bodies 2 can be ordered about be axially moveable, and then the stroke of regulation limiting piston；In order to
Lock-up valve body 2 and the relative position of regulation set 5, be provided with the first lock between valve body 2 and regulation set 5
Jack panel 8.
In a preferred embodiment, regulation set 5 is provided with adjusting rod 7, and adjusting rod 7 passes through with regulation set 5
Threaded, and the inner of adjusting rod 7 is positioned at regulation set 5, it is outside that its outer end extends to regulation set 5；
Back-moving spring 4 is away from one end contact of spool 3 on spring base, and the other end of spring base abuts against regulation
On the inner of bar 7, the outer end of adjusting rod 7 is provided with the second locking nut 9.Rotation adjusting lever 7, regulation
Bar 7 relative accommodation set 5 axially moves, and then the pre compressed magnitude of regulation back-moving spring 4；Second locking screw
Female 9 for the relative position of lock adjustment bar 7 with regulation set 5.
In a preferred embodiment, the periphery wall of valve rod 31 and damper piston 6 is provided with grading ring groove, all
Pressure ring groove can make to embed between sliding contact surface more hydraulic oil, thus alleviates friction.
In other embodiments, spool 3 being provided with choke plug 36, second section discharge orifice 35 is arranged at throttling
On stifled 36.By choke plug 36, the setting of second section discharge orifice 35 can be facilitated.
It addition, the specific embodiment of the invention also proposes a kind of hydraulic system, including pressure oil-source, hydraulic motor
And above-mentioned buffer relief valve, pressure oil-source and the oil-in of hydraulic motor, the first oil of buffer relief valve
Mouth 10 connects, and the oil return opening of hydraulic motor is connected with the second hydraulic fluid port 20 of buffer relief valve.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within bright spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (9)
1. a buffer relief valve, it is characterised in that include valve seat (1), valve body, spool (3), delay
Rush piston (6) and back-moving spring (4), described valve seat (1) is provided with the first hydraulic fluid port (10), described valve
The fixing connection of the second hydraulic fluid port (20) and valve pocket, described valve body and valve seat (1), described spool it is provided with on body
(3) being arranged in valve pocket with back-moving spring (4), described spool (3) includes valve head (32) and valve rod
(31), one end of described valve rod (31) is connected with valve head (32), its other end and back-moving spring (4)
Connecting, described valve head (32) is slidably connected with the inwall of valve pocket；Described spool is provided with first segment on (3)
Discharge orifice (33), second section discharge orifice (35) and the first cushion chamber (34), first segment discharge orifice (33) and second
Throttle orifice (35) lays respectively at the two ends of spool (3), and the first cushion chamber (34) is by first segment discharge orifice (33)
Connect with second section discharge orifice (35)；Described damper piston (6) is set on valve rod (31) slidably,
And the periphery wall of damper piston (6) is slidably connected with the inwall of valve pocket, described damper piston (6) will
Valve pocket is divided on the second cushion chamber (21) and the 3rd cushion chamber (22), and described damper piston (6) and sets
It is equipped with the 3rd throttle orifice (61)；Described first segment discharge orifice (33) connects the first hydraulic fluid port (10) and the first buffering
Chamber (34), described second section discharge orifice (35) connects the first cushion chamber (34) and the second cushion chamber (21),
Described 3rd throttle orifice (61) connects the second cushion chamber (21) and the 3rd cushion chamber (22).
Buffer relief valve the most according to claim 1, it is characterised in that described valve body includes that valve is originally
Body (2) and regulation set (5), one end of described valve body (2) is connected with valve seat (1), its other end and
Regulation set (5) is threaded connection；Described back-moving spring (4) is arranged in regulation set (5).
Buffer relief valve the most according to claim 2, it is characterised in that described regulation set (5)
Being provided with adjusting rod (7), described adjusting rod (7) is threaded connection with regulation set (5), and adjusting rod
(7) the inner is positioned at regulation set (5), and it is outside that its outer end extends to regulation set (5)；Described reset bullet
Spring (4) passes through spring base contact on the inner of adjusting rod (7) away from one end of spool (3).
Buffer relief valve the most according to claim 3, it is characterised in that described 3rd throttle orifice (61)
Diameter less than first segment discharge orifice (33) and the diameter of second section discharge orifice (35).
Buffer relief valve the most according to claim 4, it is characterised in that on described spool (3)
Being provided with choke plug (36), described second section discharge orifice (35) is arranged on described choke plug (36).
Buffer relief valve the most according to claim 1, it is characterised in that be provided with in described valve pocket
The guiding annulus (23) of convex, described valve rod (31) is slidably disposed through guiding annulus (23), and described the
Three cushion chambers (22) are positioned between guiding annulus (23) and damper piston (6).
Buffer relief valve the most according to claim 6, it is characterised in that described guiding annulus (23)
On be provided with multiple axially disposed opening (24) of crossing, multiple described openings (24) of crossing are around valve rod
(31) even circumferential is arranged.
Buffer relief valve the most according to claim 6, it is characterised in that described guiding annulus (23)
And it is provided with predetermined gap between valve rod (31) radial direction.
9. according to the buffer relief valve described in claim 1 to 8 any one, it is characterised in that described
Valve rod is provided with grading ring groove on (31)；And/or, described damper piston is provided with grading ring groove on (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610118759.9A CN105909584B (en) | 2016-03-02 | 2016-03-02 | Buffer relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610118759.9A CN105909584B (en) | 2016-03-02 | 2016-03-02 | Buffer relief valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105909584A true CN105909584A (en) | 2016-08-31 |
| CN105909584B CN105909584B (en) | 2017-12-05 |
Family
ID=56745073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610118759.9A Active CN105909584B (en) | 2016-03-02 | 2016-03-02 | Buffer relief valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105909584B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369200A (en) * | 2016-11-03 | 2017-02-01 | 华侨大学 | Gas spring overflow valve |
| CN107939767A (en) * | 2017-12-28 | 2018-04-20 | 邵立坤 | A kind of oil supplementation buffer valve |
| CN107939766A (en) * | 2017-12-28 | 2018-04-20 | 邵立坤 | A kind of oil supplementation buffer valve |
| CN108061069A (en) * | 2017-12-19 | 2018-05-22 | 宁波文泽机电技术开发有限公司 | Buffer overflow valve |
| CN108061071A (en) * | 2018-01-23 | 2018-05-22 | 邵立坤 | A kind of plug-in bidirectional buffering overflow valve |
| CN108223474A (en) * | 2018-01-19 | 2018-06-29 | 陈艳艳 | A kind of compact trimmer valve |
| CN109114061A (en) * | 2018-10-18 | 2019-01-01 | 宁波文泽机电技术开发有限公司 | Trimmer valve |
| CN109162977A (en) * | 2018-10-19 | 2019-01-08 | 宁波文泽机电技术开发有限公司 | Rotary buffering valve |
| CN111894739A (en) * | 2020-07-27 | 2020-11-06 | 中国航发贵州红林航空动力控制科技有限公司 | Control valve assembly structure with throttling nozzle |
| CN111980809A (en) * | 2020-08-31 | 2020-11-24 | 合肥中科重明科技有限公司 | Active cooling engine fuel switching device and switching method |
| CN112664689A (en) * | 2020-12-31 | 2021-04-16 | 湖南鸿辉科技有限公司 | Cartridge valve with overflow and sequence control functions |
| CN112728136A (en) * | 2020-12-24 | 2021-04-30 | 珠海市瑞信精密科技有限公司 | Buffering type fluid flow control valve |
| CN113418023A (en) * | 2021-01-29 | 2021-09-21 | 涌镇液压机械（上海）有限公司 | Reversing valve capable of being switched at high frequency |
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| JPH06137307A (en) * | 1992-07-30 | 1994-05-17 | Kayaba Ind Co Ltd | Relief valve |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369200A (en) * | 2016-11-03 | 2017-02-01 | 华侨大学 | Gas spring overflow valve |
| CN108061069A (en) * | 2017-12-19 | 2018-05-22 | 宁波文泽机电技术开发有限公司 | Buffer overflow valve |
| CN107939767A (en) * | 2017-12-28 | 2018-04-20 | 邵立坤 | A kind of oil supplementation buffer valve |
| CN107939766A (en) * | 2017-12-28 | 2018-04-20 | 邵立坤 | A kind of oil supplementation buffer valve |
| CN108223474A (en) * | 2018-01-19 | 2018-06-29 | 陈艳艳 | A kind of compact trimmer valve |
| CN108061071B (en) * | 2018-01-23 | 2020-04-10 | 立信阀门集团有限公司 | Plug-in type bidirectional buffer overflow valve |
| CN108061071A (en) * | 2018-01-23 | 2018-05-22 | 邵立坤 | A kind of plug-in bidirectional buffering overflow valve |
| CN109114061A (en) * | 2018-10-18 | 2019-01-01 | 宁波文泽机电技术开发有限公司 | Trimmer valve |
| CN109162977A (en) * | 2018-10-19 | 2019-01-08 | 宁波文泽机电技术开发有限公司 | Rotary buffering valve |
| CN109162977B (en) * | 2018-10-19 | 2020-08-28 | 湖北江威智能汽车股份有限公司 | Rotary cushion valve |
| CN111894739A (en) * | 2020-07-27 | 2020-11-06 | 中国航发贵州红林航空动力控制科技有限公司 | Control valve assembly structure with throttling nozzle |
| CN111980809A (en) * | 2020-08-31 | 2020-11-24 | 合肥中科重明科技有限公司 | Active cooling engine fuel switching device and switching method |
| CN111980809B (en) * | 2020-08-31 | 2021-07-09 | 合肥中科重明科技有限公司 | Active cooling engine fuel switching device and switching method |
| CN112728136A (en) * | 2020-12-24 | 2021-04-30 | 珠海市瑞信精密科技有限公司 | Buffering type fluid flow control valve |
| CN112664689A (en) * | 2020-12-31 | 2021-04-16 | 湖南鸿辉科技有限公司 | Cartridge valve with overflow and sequence control functions |
| CN112664689B (en) * | 2020-12-31 | 2024-06-11 | 湖南鸿辉科技有限公司 | Cartridge valve with overflow and sequence control functions |
| CN113418023A (en) * | 2021-01-29 | 2021-09-21 | 涌镇液压机械（上海）有限公司 | Reversing valve capable of being switched at high frequency |
| CN113418023B (en) * | 2021-01-29 | 2024-05-17 | 涌镇液压机械（上海）有限公司 | Reversing valve capable of being switched at high frequency |
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|---|---|
| CN105909584B (en) | 2017-12-05 |
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