CN107883052A - A kind of leakage-free pressure compensating proportion flow valve - Google Patents
A kind of leakage-free pressure compensating proportion flow valve Download PDFInfo
- Publication number
- CN107883052A CN107883052A CN201711228886.5A CN201711228886A CN107883052A CN 107883052 A CN107883052 A CN 107883052A CN 201711228886 A CN201711228886 A CN 201711228886A CN 107883052 A CN107883052 A CN 107883052A
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- Prior art keywords
- valve
- flow
- iron core
- valve body
- leakage
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention discloses a kind of leakage-free pressure compensating proportion flow valve, P mouths and T mouths are offered on its valve body, the top of valve body is equipped with valve pocket, the top of valve pocket is equipped with proportion electro-magnet, static iron core, dynamic iron core, the first spring are provided with proportion electro-magnet, dynamic iron core is provided centrally with pilot valve；The top of valve body is provided with main valve plug, in the top of main valve plug formed with control chamber in valve pocket, first flow hole and second flow channel hole are provided with main valve plug, the first damping hole is provided with first flow hole, the second damping hole is provided with second flow channel hole, the lower end of pilot valve is engaged with the second damping hole；The bottom of valve body is provided with pressure compensation valve element, and the lower end of valve body is provided with screw plug, and valve body is interior formed with sensitive cavity, second spring is provided with sensitive cavity, sensitive cavity is connected by drawing oilhole with P mouths, and when pressure compensation valve element is located at upper limit, crack mouth is left between through-flow chamber and T mouth.It the advantage is that：It is rational in infrastructure, compact, fast response time.
Description
Technical field
The present invention relates to flow valve manufacturing technology field, a kind of especially leakage-free pressure compensating proportion flow valve.
Background technology
In recent years, proportional control valve is in jacking equipments such as truck-mounted crane, high-altitude operation vehicle, tractor rotary tillage plough, electri forklifts
Upper application is more and more.In hydraulic system for lifting is loaded, usually using proportional reversing valve load is declined, it is general to decline
The opening of speed passing ratio reversal valve is adjusted, but in the case where load change is big, speed can be caused sometimes fast and sometimes slow, makes
It is unstable into system.And these proportional reversing valves are guiding valve form, when closing or allowing load to stop, load can not be protected
Hold in a certain position, can glide, the pressure of cavity volume can not be kept well in the case where needing pressurize.Or using cone valve
The valve of form adds the flow valve of pressure compensator composition, but because pressure compensator in the market is guiding valve form and
Load port pressure will guide to pressure compensator load feedback chamber, therefore equally exist the problems such as leakage rate is big, load keeps not living；
And single pressure compensator integrated level is not high, and volume is larger, even if being also not suitable for without the problem of above-mentioned leakage with upper
State on jacking equipment.
The patent of existing Patent No. 201621273379.4 entitled " leakage-free pressure compensates electric proportional throttle valve " is public
A kind of proportional flow control valve for being integrated with pressure compensator is opened, its passing ratio high-speed double electromagnet proportional flow regulatory function is main
Valve is connected with pressure-compensated valve, draws oilhole and the pressure before main valve throttling side is introduced into compensator, pass through second spring and compensation
Pressure difference is constant before and after valve element compensates guarantee main valve throttling side, not with the change of load.Coil must not electricity in the case of, first
Guide valve core can be sealed, and main valve plug is tightly pressed against on valve port by hydraulic coupling so that valve port is without any leakage, and due to drawing oilhole
Rear end draw the front side that oil-in is located at seal line, so drawing oilhole down in off position can also completely close, reduce leakage rate.
Although the said goods can realize No leakage pressurize and the control of pressure compensated proportional flow, there is also following shortcoming：
(1) due to the front side drawn oilhole and be located at seal line of pressure compensator, when coil must not be electric, pressure compensator
Sensitive cavity is no pressure, and such pressure compensator is in the fully open shape of valve port under the active force of second spring
Condition, when given coil certain voltage, because the unlatching of main valve plug is than relatively rapid, when the throttling channel of main valve plug has already turned on
When, the pressure of pressure compensator sensitive cavity is not completely set up also, and at this time pressure compensator is still in full-gear, nothing
Pressure compensation, can so cause the moment flow attack opened, and produce vibration to plant equipment, influence to use safely.
(2) rear end of the second spring in its pressure compensator is installed on spring base, and the fluid of such main valve plug will be through
Cross on spring base through flow hole outflow, in order to ensure that through-current capability does not impact to the Flow-rate adjustment of main valve plug, generally
The very great talent of spring base design can be with, can so cause the diameter of integral valve excessive, not compact.
The content of the invention
The technical problem to be solved by the invention for the present situation of prior art is to provide rational in infrastructure, compact, response speed
A kind of fast leakage-free pressure compensating proportion flow valve of degree.
Technical scheme is used by the present invention solves above-mentioned technical problem：
A kind of leakage-free pressure compensating proportion flow valve, include valve body, offer P mouths and T mouths on valve body, valve body it is upper
Portion is equipped with valve pocket, and the top of the valve pocket is equipped with proportion electro-magnet, and proportion electro-magnet internal upper part is provided with static iron core, static iron core
Fit beneath have dynamic iron core, the first spring is provided between static iron core and dynamic iron core, the lower end that is provided centrally with of dynamic iron core is
The pilot valve of pyramidal structure；
The top of valve body is provided with main valve plug, in the top of main valve plug formed with control chamber in valve pocket, is set on main valve plug
There are first flow hole and second flow channel hole, the first damping hole is provided with first flow hole, second flow channel is provided with second on hole
Damping hole, the lower end of pilot valve are engaged with the second damping hole, first flow hole conducting control chamber and P mouths, second flow channel hole
Turn on the through-flow chamber in the middle part of control chamber and valve body；
The bottom of valve body is provided with pressure compensation valve element, and the lower end of valve body is provided with screw plug, and valve body is interior in the top of screw plug
Formed with sensitive cavity, second spring is provided between the sensitive cavity intrinsic pressure compensating spool and valve body, sensitive cavity is by drawing oil
Hole is connected with P mouths, and when pressure compensation valve element is located at upper limit, crack mouth is left between through-flow chamber and T mouth.
The technical measures of optimization also include：
The lower central of above-mentioned static iron core is provided with cavity, and the upper end of the first spring is placed in the fovea superior intracavitary.
The central upper portion of above-mentioned dynamic iron core is provided with lower cavity, and the lower end of the first spring is placed in the recessed intracavitary, and with
The upper surface of pilot valve offsets cooperation.
The section of above-mentioned dynamic iron core is in "convex" shaped structure, and the lower end of static iron core is provided with and dynamic iron core lower end phase
The groove of adaptation.
Catch is provided with above-mentioned control chamber, banking stop is provided with above the catch.
Valve port cone match between above-mentioned main valve plug and P mouths and through-flow chamber.
Above-mentioned pressure compensation valve element and the valve port cone match of sensitive cavity upper end in valve body.
Above-mentioned pressure compensation valve element is in inverted T-shape structure, and second spring is sheathed on the pressure compensation valve element.
Valve pocket sealing ring is provided with outside above-mentioned valve pocket.
Valve seals and spacing back-up ring are provided with outside above-mentioned valve body.
A kind of leakage-free pressure compensating proportion flow valve of the present invention, rational in infrastructure, it makes flow by the improvement in structure
The structure of valve is more compact, and volume is smaller；It is turned on P mouths with sensitive cavity by drawing oilhole, in proportion electro-magnet no power,
In sensitive cavity under oil pressure effect, pressure compensation valve element closing valve port, meanwhile, pilot valve closes the second damping hole, main valve plug
Valve port between P mouths and through-flow chamber is closed, ensures flow valve No leakage.In addition, leave crack mouth between through-flow chamber and T mouths, than
After example electromagnet is powered, the response speed of flow valve can be greatly improved, and flow attack will not be produced.
Brief description of the drawings
Fig. 1 is the cross section structure diagram of the present invention；
Fig. 2 is I portions enlarged drawing in Fig. 1；
Fig. 3 is II enlarged drawing in Fig. 1；
Fig. 4 is the hydraulic principle figure of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
It is as shown in Figures 1 to 4 the structural representation of the present invention,
Reference therein is：P mouths, T mouths, valve body 1, through-flow chamber 1a, sensitive cavity 1b, draw oilhole 1c, crack mouth 1d, valve
Body sealing ring 11, spacing back-up ring 12, valve pocket 2, control chamber 2a, valve pocket sealing ring 21, proportion electro-magnet 3, static iron core 41, upper cavity
41a, groove 41b, dynamic iron core 42, lower cavity 42a, the first spring 43, pilot valve 5, main valve plug 6, first flow hole 61, first
Damping hole 61a, second flow channel hole 62, the second damping hole 62a, pressure compensation valve element 7, second spring 71, screw plug 8, catch 91, limit
Bit slice 92.
As shown in Figures 1 to 4,
A kind of leakage-free pressure compensating proportion flow valve, include valve body 1, P mouths and T mouths, valve body 1 are offered on valve body 1
Top be equipped with valve pocket 2, the top of the valve pocket 2 is equipped with proportion electro-magnet 3, and the internal upper part of proportion electro-magnet 3 is provided with quiet iron
Core 41, the fit beneath of static iron core 41 have dynamic iron core 42, the first spring 43 are provided between static iron core 41 and dynamic iron core 42, move iron
Core 42 is provided centrally with the pilot valve 5 that lower end is pyramidal structure；
The top of valve body 1 is provided with main valve plug 6, in the top of main valve plug 6 formed with control chamber 2a, main valve plug 6 in valve pocket 2
On be provided with first flow hole 61 and second flow channel hole 62, the first damping hole 61a, second flow channel are provided with first flow hole 61
The second damping hole 62a is provided with hole 62, the lower end of pilot valve 5 is engaged with the second damping hole 62a, and first flow hole 61 is led
Logical control chamber 2a and P mouth, second flow channel hole 62 turn on control chamber 2a and the through-flow chamber 1a at the middle part of valve body 1；
The bottom of valve body 1 is provided with pressure compensation valve element 7, and the lower end of valve body 1 is provided with screw plug 8, and valve body 1 is interior in screw plug 8
Top formed with sensitive cavity 1b, be provided with second spring 71 between sensitive cavity 1b intrinsic pressures compensating spool 7 and valve body 1,
Sensitive cavity 1b is connected by drawing oilhole 1c with P mouths, when pressure compensation valve element 7 is located at upper limit, is stayed between through-flow chamber 1a and T mouths
There is crack mouth 1d.
In embodiment, the lower central of static iron core 41 is provided with cavity 41a, and the upper end of the first spring 43 is placed on this
In cavity 41a.
In embodiment, the central upper portion of dynamic iron core 42 is provided with lower cavity 42a, and it is recessed that the lower end of the first spring 43 is placed in this
In chamber 42a, and offseted cooperation with the upper surface of pilot valve 5.
First spring 43 is placed in upper cavity 41a and lower cavity 42a, is not only able to make assembling become convenient, Er Qieneng
Enough make the structure of flow valve more compact.
In embodiment, the section of dynamic iron core 42 is in "convex" shaped structure, and the lower end of static iron core 41 is provided with and the dynamic iron
The groove 41b that the lower end of core 42 is adapted.
In embodiment, catch 91 is provided with control chamber 2a, the top of the catch 91 is provided with banking stop 92.Banking stop 92
Effect be to limit the axial displacement of dynamic iron core 42, when lower end and the banking stop 92 of dynamic iron core 42 offset, just can not move down again
.
In embodiment, the valve port cone match between main valve plug 6 and P mouths and through-flow chamber 1a.
In embodiment, pressure compensation valve element 7 and the valve port cone match of sensitive cavity 1b upper ends in valve body 1.
Cone match is used at valve port, can farthest improve the sealing of valve port.
In embodiment, pressure compensation valve element 7 is in inverted T-shape structure, and second spring 71 is sheathed on the pressure compensation valve element 7
On.
In embodiment, valve pocket sealing ring 21 is provided with outside valve pocket 2.
In embodiment, valve seals 11 and spacing back-up ring 12 are provided with outside valve body 1.Valve seals 11 and spacing back-up ring
12 in the outer wall of valve body 1, and the axial displacement of valve seals 11 is capable of in the setting of spacing back-up ring 12, ensures flow valve peace
During dress, the position of valve seals 11 is not deviateed, and ensures the reliability of sealing.
Operation principle：
When 3 no power of proportion electro-magnet, dynamic iron core 42 is located at lower limit, pilot valve 5 under the effect of the first spring 43
The pyramidal structure of lower end closes the second damping hole 62a, meanwhile, main valve plug 6 closes valve port, makes between P mouths and through-flow chamber 1a
Block；The fluid of P mouths enters sensitive cavity 1b from oilhole 1c is drawn, and in sensitive cavity 1b under oil pressure effect, pressure compensation valve element 7 is located at
Upper limit and close valve port.Flow valve No leakage is so just ensure that, reliable holding can be played to load.
When proportion electro-magnet 3 is powered, dynamic iron core 42 overcomes the elastic force of the first spring 43 upward in the presence of electromagnetic force
Motion, and drive pilot valve 5 to move upwards, the lower end and the second damping hole 62a for making pilot valve 5 are separated, the second damping
Hole 62a is turned on, and the fluid of P mouths is successively through first flow hole 61, the first damping hole 61a, the second damping hole 62a, second flow channel hole
62 enter through-flow chamber 1a, and due to leaving crack mouth 1d between through-flow chamber 1a and T mouths, part fluid will flow out from T mouths.
Due to the first damping hole 61a setting, at the initial stage of energization, oil pressure is less than the oil in sensitive cavity 1b in through-flow chamber 1a
Pressure, pressure compensation valve element 7 is still in upper limit；And be less than from the fluid flow of crack mouth 1d outflows and flow into flow, through-flow chamber 1a
Interior pressure will constantly increase, and the oil pressure of increase will push down on pressure compensation valve element 7, make through-flow chamber 1a and T mouths runner
Gradually open big.Whole process is through-flow chamber 1a and T mouths runner are steadily opened greatly, will not produce flow attack.
Due to leaving crack mouth 1d setting between through-flow chamber 1a and T mouths, this flow valve is after the energization of proportion electro-magnet 3, P
Mouthful with immediately passing through first flow hole 61 between T mouths, second flow channel hole 62, through-flow chamber 1a are turned on, therefore can be greatly improved sound
Answer speed.In addition, the flow after flow valve is opened is not interfered with without any parts in through-flow chamber 1a.
Highly preferred embodiment of the present invention has illustrated, and the various change or remodeling made by those of ordinary skill in the art are not
It can depart from the scope of the present invention.
Claims (10)
1. a kind of leakage-free pressure compensating proportion flow valve, includes valve body (1), described valve body offers P mouths and T on (1)
Mouthful, it is characterized in that：The top of described valve body (1) is equipped with valve pocket (2), and the top of the valve pocket (2) is equipped with proportion electro-magnet
(3), described proportion electro-magnet (3) internal upper part is provided with static iron core (41), and the fit beneath of static iron core (41) has dynamic iron core
(42) the first spring (43), is provided between described static iron core (41) and dynamic iron core (42), in described dynamic iron core (42)
The heart is provided with the pilot valve (5) that lower end is pyramidal structure；
The top of described valve body (1) is provided with main valve plug (6), in described valve pocket (2) the top of main valve plug (6) formed with
Control chamber (2a), first flow hole (61) and second flow channel hole (62) is provided with main valve plug (6), first flow hole is set on (61)
Be equipped with the first damping hole (61a), be provided with the second damping hole (62a) on second flow channel hole (62), the lower end of pilot valve (5) with
Second damping hole (62a) is engaged, first flow hole (61) conducting control chamber (2a) and P mouths, second flow channel hole (62) conducting control
Through-flow chamber (1a) in the middle part of chamber (2a) processed and valve body (1)；
The bottom of described valve body (1) is provided with pressure compensation valve element (7), and the lower end of described valve body (1) is provided with screw plug
(8), in described valve body (1) in the top of screw plug (8) formed with sensitive cavity (1b), sensitive cavity (1b) the intrinsic pressure recuperation valve
Second spring (71) is provided between core (7) and valve body (1), described sensitive cavity (1b) is connected by drawing oilhole (1c) with P mouths
It is logical, when pressure compensation valve element (7) is located at upper limit, crack mouth (1d) is left between through-flow chamber (1a) and T mouths.
2. a kind of leakage-free pressure compensating proportion flow valve according to claim 1, it is characterized in that：Described static iron core
(41) lower central is provided with cavity (41a), and the upper end of described the first spring (43) is placed in cavity on this (41a)
It is interior.
3. a kind of leakage-free pressure compensating proportion flow valve according to claim 2, it is characterized in that：Described dynamic iron core
(42) central upper portion is provided with lower cavity (42a), and the lower end of described the first spring (43) is placed in the lower cavity (42a),
And offseted cooperation with the upper surface of pilot valve (5).
4. a kind of leakage-free pressure compensating proportion flow valve according to claim 3, it is characterized in that：Described dynamic iron core
(42) section is in "convex" shaped structure, and the lower end of described static iron core (41) is provided with mutually fits with the dynamic iron core (42) lower end
The groove (41b) matched somebody with somebody.
5. a kind of leakage-free pressure compensating proportion flow valve according to claim 4, it is characterized in that：Described control chamber
Catch (91) is provided with (2a), banking stop (92) is provided with above the catch (91).
6. a kind of leakage-free pressure compensating proportion flow valve according to claim 5, it is characterized in that：Described main valve plug
(6) the valve port cone match between P mouths and through-flow chamber (1a).
7. a kind of leakage-free pressure compensating proportion flow valve according to claim 6, it is characterized in that：Described pressure compensation
Valve element (7) and the valve port cone match of valve body (1) interior sensitive cavity (1b) upper end.
8. a kind of leakage-free pressure compensating proportion flow valve according to claim 7, it is characterized in that：Described pressure compensation
Valve element (7) is in inverted T-shape structure, and described second spring (71) is sheathed on the pressure compensation valve element (7).
9. a kind of leakage-free pressure compensating proportion flow valve according to claim 8, it is characterized in that：Described valve pocket (2)
It is provided with valve pocket sealing ring (21) outside.
10. a kind of leakage-free pressure compensating proportion flow valve according to claim 9, it is characterized in that：Described valve body (1)
It is provided with valve seals (11) and spacing back-up ring (12) outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711228886.5A CN107883052B (en) | 2017-11-29 | 2017-11-29 | A kind of leakage-free pressure compensating proportion flow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711228886.5A CN107883052B (en) | 2017-11-29 | 2017-11-29 | A kind of leakage-free pressure compensating proportion flow valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107883052A true CN107883052A (en) | 2018-04-06 |
| CN107883052B CN107883052B (en) | 2019-06-21 |
Family
ID=61776111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711228886.5A Active CN107883052B (en) | 2017-11-29 | 2017-11-29 | A kind of leakage-free pressure compensating proportion flow valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN107883052B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110878777A (en) * | 2019-11-28 | 2020-03-13 | 宁波文泽机电技术开发有限公司 | Pressure control valve |
| CN113606213A (en) * | 2021-08-12 | 2021-11-05 | 浙江苏强格液压股份有限公司 | Compensation valve |
| WO2022042633A1 (en) * | 2020-08-31 | 2022-03-03 | 浙江三花汽车零部件有限公司 | Electromagnetic valve and electromagnetic valve assembly |
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| EP1388672A2 (en) * | 2002-08-05 | 2004-02-11 | Husco International, Inc. | Pilot operated control valve having a poppet with integral pressure compensating mechanism |
| US20090212244A1 (en) * | 2008-02-26 | 2009-08-27 | Pfaff Joseph L | Pilot operated valve with fast closing poppet |
| CN101737370A (en) * | 2010-01-29 | 2010-06-16 | 浙江大学 | Fast hydraulic change-over valve |
| CN103857925A (en) * | 2011-03-22 | 2014-06-11 | 派克汉尼芬公司 | Electro-proportional pilot operated poppet valve with pressure compensation |
| CN105805405A (en) * | 2016-05-24 | 2016-07-27 | 北京工业大学 | Seawater hydraulic proportional flow control valve |
| CN206280319U (en) * | 2016-11-24 | 2017-06-27 | 浙江华益精密机械股份有限公司 | The electric proportional throttle valve of leakage-free pressure compensation |
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2017
- 2017-11-29 CN CN201711228886.5A patent/CN107883052B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1388672A2 (en) * | 2002-08-05 | 2004-02-11 | Husco International, Inc. | Pilot operated control valve having a poppet with integral pressure compensating mechanism |
| US20090212244A1 (en) * | 2008-02-26 | 2009-08-27 | Pfaff Joseph L | Pilot operated valve with fast closing poppet |
| CN101737370A (en) * | 2010-01-29 | 2010-06-16 | 浙江大学 | Fast hydraulic change-over valve |
| CN103857925A (en) * | 2011-03-22 | 2014-06-11 | 派克汉尼芬公司 | Electro-proportional pilot operated poppet valve with pressure compensation |
| CN105805405A (en) * | 2016-05-24 | 2016-07-27 | 北京工业大学 | Seawater hydraulic proportional flow control valve |
| CN206280319U (en) * | 2016-11-24 | 2017-06-27 | 浙江华益精密机械股份有限公司 | The electric proportional throttle valve of leakage-free pressure compensation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110878777A (en) * | 2019-11-28 | 2020-03-13 | 宁波文泽机电技术开发有限公司 | Pressure control valve |
| CN110878777B (en) * | 2019-11-28 | 2021-06-01 | 温州英斯蒙特自动化仪表有限公司 | Pressure control valve |
| WO2022042633A1 (en) * | 2020-08-31 | 2022-03-03 | 浙江三花汽车零部件有限公司 | Electromagnetic valve and electromagnetic valve assembly |
| CN113606213A (en) * | 2021-08-12 | 2021-11-05 | 浙江苏强格液压股份有限公司 | Compensation valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107883052B (en) | 2019-06-21 |
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Effective date of registration: 20190523 Address after: 250101 AB Block 405-1, Century Fortune Center, West Side of Xinyu Road, Jinan High-tech Zone, Shandong Province Applicant after: Shandong Liwei Hydraulic Technology Co., Ltd. Address before: 315000 Room 013, Room 18-1, 035, 555 Juxian Road, Ningbo High-tech Zone, Ningbo City, Zhejiang Province Applicant before: Ningbo Wen fan electrical and Mechanical Technology Development Co., Ltd. |
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