CN105909584B - Buffer relief valve - Google Patents
Buffer relief valve Download PDFInfo
- Publication number
- CN105909584B CN105909584B CN201610118759.9A CN201610118759A CN105909584B CN 105909584 B CN105909584 B CN 105909584B CN 201610118759 A CN201610118759 A CN 201610118759A CN 105909584 B CN105909584 B CN 105909584B
- Authority
- CN
- China
- Prior art keywords
- valve
- cushion chamber
- damper piston
- rod
- throttle orifice
- 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.)
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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
Abstract
The invention discloses a kind of buffer relief valve, it is provided with first segment discharge orifice, the second throttle orifice and the 3rd throttle orifice, and form three the first cushion chamber, the second cushion chamber and the 3rd cushion chamber cushion chambers, pass through the cushioning effect step by step of three cushion chambers, the process that can increase hydraulic system pressure delays, and then avoid pressure rise too fast, while can be by changing big minor adjustment buffer time of cushion chamber.In addition, by the way that damper piston is arranged on valve rod, the volume of valve can be made smaller, more compact structure；The guide effect of valve rod, inordinate wear caused by eccentric clamping stagnation in valve element and damper piston moving process can be reduced.Therefore, compared with prior art, buffer relief valve proposed by the present invention is on the premise of pooling feature is realized, buffering effect when further enhancing the rising of pressure moment and persistently rising, reduce the abrasion of valve element and damper piston, improve the life-span of buffer relief valve.
Description
Technical field
The present invention relates to hydraulic transmission technology, and in particular to a kind of buffer relief valve.
Background technology
In excavator walks startup and braking procedure, the rising of walking mechanism load transients is larger, causes in walking mechanism
Portion's impact is larger, and parts wear is more serious.In order to reduce the negative effect that hydraulic shock is brought, generally in the suitable of hydraulic system
, can be with the pressure oscillation of suppression system using buffer relief valve when position installation buffer relief valve, and then reduce complete machine
Fault rate.Common buffer relief valve, buffer unit all on the outside of overflow valve pocket, directly bear compression shock, because
This easily causes buffer unit clamping stagnation and heavy wear, makes the average life time of buffer unit shorter, simultaneous buffering device only leans on
Volume caused by damper piston movement enters row buffering, and buffering effect is bad, it is impossible to the protective effect of buffering overflow is preferably played,
Cause service life shorter.
The content of the invention
In view of this, the present invention proposes a kind of buffer relief valve, compared with prior art, the buffer relief valve structure
Reliably, buffering effect is obvious.
The present invention proposes a kind of buffer relief valve, and it includes valve seat, valve body, valve element, damper piston and back-moving spring, institute
To state and the first hydraulic fluid port is provided with valve seat, the second hydraulic fluid port and valve pocket are provided with the valve body, the valve body is fixedly connected with valve seat,
The valve element and back-moving spring are arranged in valve pocket, and the valve element includes valve head and valve rod, one end of the valve rod and valve head
Connection, its other end are connected with back-moving spring, and the inwall of the valve head and valve pocket is slidably connected；First is provided with the valve element
Throttle orifice, the second throttle orifice and the first cushion chamber, first segment discharge orifice and the second throttle orifice are located at the both ends of valve element respectively, and first is slow
Chamber is rushed to connect first segment discharge orifice and the second throttle orifice；The damper piston is slideably set on valve rod, and damper piston
Periphery wall and the inwall of valve pocket slidably connect, valve pocket is divided into the second cushion chamber and the 3rd buffering by the damper piston
Chamber, and the 3rd throttle orifice is provided with the damper piston；The first segment discharge orifice connects the first hydraulic fluid port and the first cushion chamber, institute
State the second throttle orifice and connect the first cushion chamber and the second cushion chamber, the 3rd throttle orifice connects the second cushion chamber and the 3rd buffering
Chamber.
Preferably, the valve body includes valve body and adjusting set, and one end of the valve body is connected with valve seat, its other end
It is connected through a screw thread with adjusting set；The back-moving spring is arranged in adjusting set.
Preferably, the adjusting set is provided with adjusting rod, and the adjusting rod is connected through a screw thread with adjusting set, and adjusting rod
The inner be located in adjusting set, its outer end is extended to outside adjusting set；The one end of the back-moving spring away from valve element passes through spring
Seat contact is on the inner of adjusting rod.
Preferably, the diameter of the 3rd throttle orifice is less than the diameter of first segment discharge orifice and the second throttle orifice.
Preferably, choke plug is provided with the valve element, second throttle orifice is arranged on the choke plug.
Preferably, the guiding annulus of convex is provided with the valve pocket, the valve rod is slidably disposed through being oriented to annulus, institute
The 3rd cushion chamber is stated between guiding annulus and damper piston.
Preferably, described be oriented to is provided with multiple axially disposed openings excessively on annulus, multiple openings excessively
Arranged around valve rod even circumferential.
Preferably, it is provided with predetermined gap between the guiding annulus and valve rod radial direction.
Preferably, grading ring groove is provided with the valve rod；And/or grading ring groove is provided with the damper piston.
Buffer relief valve proposed by the present invention is provided with first segment discharge orifice, the second throttle orifice and the 3rd throttle orifice, and shape
Into three the first cushion chamber, the second cushion chamber and the 3rd cushion chamber cushion chambers, by the cushioning effect step by step of three cushion chambers,
The process that can increase hydraulic system pressure delays, and then avoids pressure rise too fast, while can be by changing cushion chamber
Big minor adjustment buffer time.In addition, by the way that damper piston is arranged on valve rod, it can make that the volume of valve is smaller, and structure is tighter
Gather；The guide effect of valve rod, inordinate wear caused by eccentric clamping stagnation in valve element and damper piston moving process can be reduced.Cause
This, compared with prior art, buffer relief valve proposed by the present invention further enhancing on the premise of pooling feature is realized
Buffering effect when pressure moment rises and persistently risen, reduces the abrasion of valve element and damper piston, improves buffer-type overflow
The life-span of valve.
Brief description of the drawings
The accompanying drawing for forming the part of the present invention is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation for the buffer relief valve that the specific embodiment of the invention provides；
Fig. 2 is the structural representation for the valve element that the specific embodiment of the invention provides；
Fig. 3 is the structural representation for the valve body that the specific embodiment of the invention provides；
Fig. 4 is the structural representation for the adjusting set that the specific embodiment of the invention provides；
Fig. 5 is the structural representation for the damper piston that the specific embodiment of the invention provides.
Description of reference numerals：
1-valve seat, 2-valve body, 3-valve element, 4-back-moving spring, 5-adjusting set
6-damper piston, 7-adjusting rod the 9-the second locking nut of the 8-the first locking nut
10-the first the 20-the second hydraulic fluid port of hydraulic fluid port the 22-the three cushion chamber of the 21-the second cushion chamber
23-it is oriented to annulus 24-mistake opening 31-valve rod, 32-valve head
33-first segment discharge orifice the 34-the first cushion chamber 36-choke plug of the 35-the second throttle orifice
61-the three throttle orifice
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.1 to 5 pair of specific embodiment of the invention is described in detail below in conjunction with the accompanying drawings.
As shown in figure 1, the buffer relief valve that the specific embodiment of the invention proposes includes valve seat 1, valve body, valve element 3, buffering
Piston 6 and back-moving spring 4；Valve body includes valve body 2 and adjusting set 5, is provided with the first hydraulic fluid port 10 on valve seat 1, is set on valve body 2
The second hydraulic fluid port 20 is equipped with, one end of valve body 2 is fixedly connected with valve seat 1, and its other end is connected through a screw thread with adjusting set 5, valve
Body 2 is internally formed valve pocket with adjusting set 5, and valve element 3 and back-moving spring 4 are arranged in valve pocket；As shown in figure 3, set on valve body 2
The guiding annulus 23 of convex is equipped with, is oriented to and multiple axially extending openings 24 excessively is provided with annulus 23.
As shown in Fig. 2 valve element 3 includes valve head 32 and valve rod 31, valve head 32 is located at the left end of valve rod 31；The periphery of valve head 32
Wall is slidably connected with valve body 2, and the end set of valve head 32 has conical seal (contact) face, for blocking the first hydraulic fluid port 10；Back-moving spring 4 is set
Put in adjusting set 5, valve rod 31 is radially set through the guiding annulus 23 on valve body 2 between valve rod 31 and guiding annulus 23
Be equipped with predetermined gap, the right-hand member of valve rod 31 by spring base contact on the left end of back-moving spring 4, the effect of back-moving spring 4
Power drives valve element 3 to be moved towards the first hydraulic fluid port 10；First segment discharge orifice 33, the first cushion chamber 34 have been sequentially arranged on valve element 3
And second throttle orifice 35, and first segment discharge orifice 33 is located on valve head 32, the second throttle orifice 35 is located at the right-hand member of valve rod 31.
As shown in figure 1, damper piston 6 is slideably set on valve rod 31, and the periphery wall valve body 2 of damper piston 6
Inwall is slidably connected, and valve pocket is divided into the second cushion chamber 21 and the 3rd cushion chamber 22 by damper piston 6, and in damper piston
The 3rd throttle orifice 61 is provided with 6；On buffer relief valve, first segment discharge orifice 33 connects the first hydraulic fluid port 10 and the first cushion chamber
34, the second throttle orifice 35 connects the first cushion chamber 34 and the second cushion chamber 21, the second cushion chamber of the 3rd throttle orifice 61 connection 21 and
3rd cushion chamber 22, and the diameter of the 3rd throttle orifice 61 is less than the throttle orifice 35 of first segment discharge orifice 33 and second.
Using when, the first hydraulic fluid port 10 connection high-pressure oil passage, the second hydraulic fluid port 20 connection low pressure oil way；The buffer relief valve
Operation principle is：With the pressure rise of high-pressure oil passage, when the active force that the left end of valve element 3 is subject to is more than the resistance of right-hand member, valve element 3
Move right, the first hydraulic fluid port 10 connects with the second hydraulic fluid port 20, and then carries out pressure release, the pressure relieving of high-pressure oil passage to high-pressure oil passage
Increase tendency, at the same time, section hydraulic oil overcome the damping of first segment discharge orifice 33 to enter the first cushion chamber 34, the first buffering
Chamber 34 with accommodating portion hydraulic oil, can further delay the trend of pressure increase；As pressure continues to raise, hydraulic oil overcomes
The damping of two throttle orifices 35 enters the second cushion chamber 21, and the second cushion chamber 21 can accommodate a certain amount of hydraulic oil, equally
The trend that high-pressure oil passage pressure can be delayed to increase, in the presence of hydraulic oil, damper piston 6 is moved to the left so that second is slow
The increase of the volume of chamber 21 is rushed, and then more hydraulic oil can be accommodated, further delays the increase tendency of pressure；With high-pressure oil passage
Pressure be stepped up and the pressure of the second cushion chamber 21 incrementally increases, when the stress of the right-hand member of valve element 3 is more than left end stress, valve
Core 3 is moved to the left, and drives valve head 32 to block at the first hydraulic fluid port 10, and the pressure of final high-pressure oil passage progressively increases from relatively low state
Higher state is added to, valve element 3 is in unlatching and closing process, and mobile slow, damper piston 6 slowly, subtracts in moving process
It is small because valve element 3 caused by quick washing and damper piston 6 are offset, reduce damper piston 6 abrasion.
When the second hydraulic fluid port 20 connects high-pressure oil passage, the first hydraulic fluid port 10 connection low pressure oil way, as pressure increases, hydraulic oil
Successively by opening 24, valve rod 31 and the gap being oriented between circle, the 3rd cushion chamber 22 is entered, in driving for hydraulic oil
Under, damper piston 6 moves right；As pressure continues to increase, hydraulic oil overcomes the damping of the 3rd throttle orifice 61, enters second
Cushion chamber 21, due to the effect of the 3rd throttle orifice 61, the pressure buildup in the 3rd cushion chamber 22 is slow, makes damper piston 6 slow
Move right, reduce the abrasion of damper piston 6.As pressure continues to increase, hydraulic oil enters first through the second throttle orifice 35 and delayed
Chamber 34 is rushed, and eventually passes through first segment discharge orifice 33 and flows to the first hydraulic fluid port 10.
Be appreciated that according to above-mentioned operation principle when pressure increases suddenly, the first cushion chamber 34, the second cushion chamber 21 and
3rd cushion chamber 22 is by accommodating portion hydraulic oil, so as to slow down the rise of high-pressure oil passage pressure, meanwhile, valve element 3 increases in pressure
During big, a certain degree of pressure release is carried out to high-pressure oil passage in good time so that the increase of pressure more slows down.
By setting guiding annulus 23 to ensure valve element 3 axially movable, and in valve rod 31 with being oriented to annulus 23
Between predetermined gap is set, it is possible to reduce valve rod 31 be oriented to annulus 23 directly contact, mitigate abrasion.
In a preferred embodiment, valve body 2 is connected through a screw thread with adjusting set 5, rotary regulating sleeve 5, can drive tune
5 relative valve body 2 of section set is axially moveable, and then adjusts the stroke of limiting piston；In order to lock valve body 2 and adjusting set 5
Relative position, the first locking nut 8 is provided between valve body 2 and adjusting set 5.
In a preferred embodiment, adjusting set 5 is provided with adjusting rod 7, and adjusting rod 7 is connected through a screw thread with adjusting set 5, and
The inner of adjusting rod 7 is located in adjusting set 5, and its outer end is extended to outside adjusting set 5；One end top of the back-moving spring 4 away from valve element 3
It is against on spring base, the other end of spring base is abutted against on the inner of adjusting rod 7, and second is provided with the outer end of adjusting rod 7
Locking nut 9.Rotation adjusting lever 7, the relative adjustment of adjusting rod 7 set 5 axially moves, and then adjusts the precommpression of back-moving spring 4
Amount；Second locking nut 9 is used for lock adjustment bar 7 and the relative position of adjusting set 5.
In a preferred embodiment, grading ring groove is provided with the periphery wall of valve rod 31 and damper piston 6, grading ring groove can
So that embedded more hydraulic oil between sliding contact surface, so as to mitigate friction.
In other embodiments, choke plug 36 is provided with valve element 3, the second throttle orifice 35 is arranged on choke plug 36.It is logical
Choke plug 36 is crossed, the setting of the second throttle orifice 35 can be facilitated.
In addition, the specific embodiment of the invention also proposes a kind of hydraulic system, including pressure oil-source, hydraulic motor and above-mentioned slow
Formula overflow valve is rushed, pressure oil-source and the oil inlet of hydraulic motor, the first hydraulic fluid port 10 of buffer relief valve connect, hydraulic motor
Second hydraulic fluid port 20 of oil return opening and buffer relief valve connects.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (8)
1. a kind of buffer relief valve, it is characterised in that including valve seat (1), valve body, valve element (3), damper piston (6) and reset
Spring (4), the first hydraulic fluid port (10) is provided with the valve seat (1), the second hydraulic fluid port (20) and valve pocket, institute are provided with the valve body
State valve body to be fixedly connected with valve seat (1), the valve element (3) and back-moving spring (4) are arranged in valve pocket, valve element (3) bag
Valve head (32) and valve rod (31) are included, one end of the valve rod (31) is connected with valve head (32), and its other end connects with back-moving spring (4)
Connect, the valve head (32) and the inwall of valve pocket are slidably connected；First segment discharge orifice (33), the second section are provided with the valve element (3)
Discharge orifice (35) and the first cushion chamber (34), first segment discharge orifice (33) and the second throttle orifice (35) are located at the both ends of valve element (3) respectively,
First cushion chamber (34) connects first segment discharge orifice (33) with the second throttle orifice (35)；The damper piston (6) slideably covers
It is located on valve rod (31), and the periphery wall of damper piston (6) and the inwall of valve pocket slidably connect, the damper piston (6)
Valve pocket is divided into the second cushion chamber (21) and the 3rd cushion chamber (22), and the 3rd throttling is provided with the damper piston (6)
Hole (61)；The first segment discharge orifice (33) connects the first hydraulic fluid port (10) and the first cushion chamber (34), second throttle orifice (35)
The first cushion chamber (34) and the second cushion chamber (21) are connected, the 3rd throttle orifice (61) connects the second cushion chamber (21) and the 3rd
Cushion chamber (22)；The guiding annulus (23) of convex is provided with the valve pocket, the valve rod (31) is slidably disposed through being oriented to circle
Ring (23), the 3rd cushion chamber (22) is between guiding annulus (23) and damper piston (6)；On the guiding annulus (23)
It is provided with multiple axially disposed openings (24) excessively.
2. buffer relief valve according to claim 1, it is characterised in that the valve body includes valve body (2) and regulation
Cover (5), one end of the valve body (2) is connected with valve seat (1), and its other end is connected through a screw thread with adjusting set (5)；It is described multiple
Position spring (4) is arranged in adjusting set (5).
3. buffer relief valve according to claim 2, it is characterised in that the adjusting set (5) is provided with adjusting rod
(7), the adjusting rod (7) is connected through a screw thread with adjusting set (5), and the inner of adjusting rod (7) is located in adjusting set (5), its
It is outside that outer end extends to adjusting set (5)；The one end of the back-moving spring (4) away from valve element (3) is being adjusted by spring base contact
On the inner of bar (7).
4. buffer relief valve according to claim 3, it is characterised in that the diameter of the 3rd throttle orifice (61) is less than
The diameter of first segment discharge orifice (33) and the second throttle orifice (35).
5. buffer relief valve according to claim 4, it is characterised in that be provided with choke plug on the valve element (3)
(36), second throttle orifice (35) is arranged on the choke plug (36).
6. buffer relief valve according to claim 1, it is characterised in that multiple openings (24) of crossing surround valve rod
(31) even circumferential is arranged.
7. buffer relief valve according to claim 1, it is characterised in that the guiding annulus (23) and valve rod (31) footpath
Predetermined gap is provided between.
8. according to the buffer relief valve described in claim 1 to 7 any one, it is characterised in that set on the valve rod (31)
It is equipped with grading ring groove；And/or it is provided with grading ring groove on the damper piston (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 CN105909584A (en) | 2016-08-31 |
| CN105909584B true 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) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369200B (en) * | 2016-11-03 | 2018-07-20 | 华侨大学 | A kind of gas spring overflow valve |
| CN108061069B (en) * | 2017-12-19 | 2019-11-15 | 浙江百思达水暖股份有限公司 | 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 |
| CN109114061B (en) * | 2018-10-18 | 2020-01-07 | 乐清市东风煤矿设备有限公司 | Buffer 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 |
| 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 |
| CN112728136B (en) * | 2020-12-24 | 2022-09-02 | 珠海市瑞信精密科技有限公司 | Buffering type fluid flow control valve |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3228566B2 (en) * | 1992-07-30 | 2001-11-12 | カヤバ工業株式会社 | Relief valve |
| JP3336181B2 (en) * | 1995-12-27 | 2002-10-21 | 日立建機株式会社 | Relief valve with accumulator |
| JP2908435B1 (en) * | 1998-06-12 | 1999-06-21 | 川崎重工業株式会社 | Relief valve |
| CN201925544U (en) * | 2011-01-24 | 2011-08-10 | 山东常林机械集团股份有限公司 | Safe valve for motor |
| CN202073860U (en) * | 2011-06-01 | 2011-12-14 | 宁波克泰液压有限公司 | Threaded plug-in adjustable buffer overflow valve |
| JP5775368B2 (en) * | 2011-06-08 | 2015-09-09 | 川崎重工業株式会社 | Relief valve |
| CN202182080U (en) * | 2011-08-15 | 2012-04-04 | 宁波广天赛克思液压有限公司 | Overflow valve with secondary buffering function for hydraulic pump |
| CN102913513A (en) * | 2012-10-31 | 2013-02-06 | 陕西航天动力高科技股份有限公司 | High-reliability directly operated type safety valve device with hydraulic balance principle |
| CN102996557A (en) * | 2012-12-27 | 2013-03-27 | 宁波广天赛克思液压有限公司 | Pressure adjustable buffer overflow valve |
| CN103697019A (en) * | 2013-12-27 | 2014-04-02 | 龙工（上海）精工液压有限公司 | Safety valve for motor of excavator |
| CN205503596U (en) * | 2016-03-02 | 2016-08-24 | 杭州力龙液压有限公司 | Buffering formula overflow valve |
-
2016
- 2016-03-02 CN CN201610118759.9A patent/CN105909584B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105909584A (en) | 2016-08-31 |
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