CN107504006A - A kind of normally opened ratio one-way flow valves - Google Patents
A kind of normally opened ratio one-way flow valves Download PDFInfo
- Publication number
- CN107504006A CN107504006A CN201710975695.9A CN201710975695A CN107504006A CN 107504006 A CN107504006 A CN 107504006A CN 201710975695 A CN201710975695 A CN 201710975695A CN 107504006 A CN107504006 A CN 107504006A
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- CN
- China
- Prior art keywords
- valve
- mouths
- normally opened
- way flow
- 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
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- 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
- F15B13/027—Check valves
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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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
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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
- F16K31/0644—One-way valve
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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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Servomotors (AREA)
Abstract
A kind of normally opened ratio one-way flow valves of the present invention, valve body including being provided with A mouths and B mouths, the top of valve body is bolted with swivel nut, the top of swivel nut is equipped with proportion electro-magnet, the proportion electro-magnet is provided centrally with armature, the lower end of armature is offseted cooperation by a push rod and the pilot valve that is arranged in swivel nut, spring is provided between the top of pilot valve and baffle ring, the lower end of pilot valve passes through the throttle orifice at positioning sleeve center, pressure feedback chamber is provided with above throttle orifice, hydraulic control chamber is provided with below throttle orifice；Valve pocket is provided with below positioning sleeve in valve body, the valve pocket is provided centrally with main valve plug, the side oilhole communicated with B mouths and the lower oilhole communicated with A mouths are provided with valve pocket, offer the first damping hole in the side wall of swivel nut with B mouths to be connected, the center of main valve plug offers the second damping hole and with lower oilhole is connected；The aperture of throttle orifice on positioning sleeve is changed by the up and down motion of pilot valve；Stability of flow advantage is kept when changing with load.
Description
Technical field
The present invention relates to magnetic valve manufacturing technology field, a kind of especially normally opened ratio one-way flow valves.
Background technology
In recent years, ratio one-way flow valves lift in truck-mounted crane, high-altitude operation vehicle, tractor rotary tillage plough, electri forklift etc.
Using more and more in equipment.When equipment stops, ratio one-way flow valves play a part of pressurize, prevent hydraulic cylinder from gliding；
When equipment needs to decline, ratio one-way flow valves control openings of sizes, adjust hydraulic cylinder according to the voltage signal size of input
The flow of output, and then control the decrease speed of jacking equipment.
Such as a kind of patent of invention of Patent No. 201510807564.0 entitled " big-powered tractor lifter valve group "
In disclose it is a kind of control tractor lifting mechanism hydraulic valve bank, wherein just employing 2 ratio one-way flow valves, use respectively
In the raising and lowering speed regulation of control lifter.The ratio one-way flow valves that currently there are, simply with ratio electricity
Magnet simply controls the displacement of pilot valve, although the aperture of proportioning valve valve port can be controlled, because not becoming load
Pressure difference feedback caused by change, can not stability contorting equipment in the equipment of some load pressures change greatly in pilot valve
Speed, give same control voltage signal, equipment decrease speed is fast when loading big, and load becomes hour equipment decrease speed again
It is slack-off.In order to solve this problem, usually increase a pressure compensator, load unrelated proportional flow control to reach, such as
Above-mentioned patent increases a pressure compensator in the ratio one-way flow valve inlet that control cylinder rises.Extra increase pressure
Force compensating device, necessarily cause use cost rising and hydraulic valve bank volume change it is big, this is that many clients institute is unacceptable；
Therefore, its structure is further improved.
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, regulation is sensitive, control
Make a kind of stable normally opened ratio one-way flow valves.
Technical scheme is used by the present invention solves above-mentioned technical problem：
A kind of normally opened ratio one-way flow valves, include valve body, and A mouths and B mouths are provided with valve body, and the top of valve body is spirally connected
There is swivel nut, the top of swivel nut is equipped with proportion electro-magnet, and the proportion electro-magnet is provided centrally with armature, and the lower end of armature passes through
One push rod and the pilot valve being arranged in the swivel nut are offseted cooperation, and bullet is provided between the top of pilot valve and baffle ring
Spring, the lower end of pilot valve pass through the throttle orifice at positioning sleeve center, pressure feedback chamber are provided with above throttle orifice, throttle orifice
Lower section is provided with hydraulic control chamber；Valve pocket is provided with below the positioning sleeve in valve body, the valve pocket is provided centrally with leading
Valve element, the side oilhole communicated with B mouths and the lower oilhole communicated with A mouths are provided with valve pocket, first is offered in the side wall of swivel nut
Damping hole, the first damping hole are connected with B mouths, and the center of main valve plug offers the second damping hole, the second damping hole with it is described under
Oilhole is connected；The aperture of throttle orifice on positioning sleeve is changed by the up and down motion of pilot valve；Main valve plug is set to be pressed on B mouths
Power become it is big when, reduce opening, B mouths pressure become hour, main valve plug opening increase, constantly regulate and reach dynamic equilibrium, Jin Erda
Stability of flow is kept when changing to load.
The technical measures of optimization also include：
The top of above-mentioned main valve plug is in terraced structure.
The lower end of above-mentioned main valve plug is provided with inclined-plane, and the inclined-plane is engaged with the lower oilhole.
The top of above-mentioned throttle orifice, which is expanded, is formed with taper hole.
The top of above-mentioned pilot valve is provided with bulge loop, and the upper end of spring and the lower surface of the bulge loop offset.
Spacer is provided with outside above-mentioned pilot valve, baffle ring is fixed on the bottom of the spacer.
The first sealing ring is provided between the lower end of above-mentioned valve pocket and the valve body.
The second sealing ring is provided between the middle part of above-mentioned swivel nut and the valve body.
A kind of normally opened ratio one-way flow valves of the present invention, rational in infrastructure, it is anti-to introduce pressure difference by the improvement in structure for it
Feedback, active force are first applied in pilot valve, change the aperture of throttle orifice on positioning sleeve by the up and down motion of pilot valve；
Make main valve plug on B mouths pressure become it is big when, reduce opening, B mouths pressure become hour, main valve plug opening increase, constantly regulate and reach
To dynamic equilibrium, and then the purpose that stability of flow is kept during change is loaded, its regulation is sensitive, and control is stable.
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：A mouths, B mouths, valve body 1, swivel nut 2, the first damping hole 2a, proportion electro-magnet 31, armature
32nd, push rod 4, pilot valve 5, baffle ring 51, spring 52, bulge loop 53, spacer 54, positioning sleeve 6, throttle orifice 6a, taper hole 6b, pressure are anti-
Present chamber 61, hydraulic control chamber 62, valve pocket 7, side oilhole 7a, lower oilhole 7b, main valve plug 8, the second damping hole 8a, the first sealing ring
91st, the second sealing ring 92.
As shown in Figure 1 to Figure 3,
A kind of normally opened ratio one-way flow valves, include valve body 1, and A mouths and B mouths, the top of valve body 1 are provided with valve body 1
Swivel nut 2 is bolted with, the top of swivel nut 2 is equipped with proportion electro-magnet 31, and the proportion electro-magnet 31 is provided centrally with armature 32, rank
The lower end of iron 32 is offseted cooperations by a push rod 4 with the pilot valve 5 being arranged in the swivel nut 2, the top of pilot valve 5 and
Spring 52 is provided between baffle ring 51, the lower end of pilot valve 5 passes through the throttle orifice 6a at the center of positioning sleeve 6, and throttle orifice 6a's is upper
Side is provided with pressure feedback chamber 61, and hydraulic control chamber 62 is provided with below throttle orifice 6a；In the positioning sleeve 6 in valve body 1
Lower section is provided with valve pocket 7, and the valve pocket 7 is provided centrally with main valve plug 8, be provided with valve pocket 7 the side oilhole 7a that is communicated with B mouths and
The lower oilhole 7b communicated with A mouths, the first damping hole 2a being offered in the side wall of swivel nut 2, the first damping hole 2a is connected with B mouths,
The center of main valve plug 8 offers the second damping hole 8a, the second damping hole 8a and is connected with the lower oilhole 7b；Pass through pilot valve
5 up and down motion changes the aperture of throttle orifice on positioning sleeve 6；Main valve plug is set to reduce opening, B mouths when pressure on B mouths becomes big
Pressure become hour, main valve plug 8 opening increase, constantly regulate and reach dynamic equilibrium, and then load change when keep flow
It is stable.
In embodiment, the top of main valve plug 8 is in terraced structure.
In embodiment, the lower end of main valve plug 8 is provided with inclined-plane, and the inclined-plane is engaged with the lower oilhole 7b.
In embodiment, throttle orifice 6a top, which is expanded, is formed with taper hole 6b.
In embodiment, the top of pilot valve 5 is provided with bulge loop 53, the upper end of spring 52 and the lower surface of the bulge loop 53
Offset.
In embodiment, spacer 54 is provided with outside pilot valve 5, baffle ring 51 is fixed on the bottom of the spacer 54.
In embodiment, the first sealing ring 91 is provided between the lower end of valve pocket 7 and the valve body 1.First sealing ring 91
Setting ensure that the sealing between valve pocket 7 and valve body 1, can ensure the stable operation of flow valve.
In embodiment, the second sealing ring 92 is provided between the middle part of swivel nut 2 and the valve body 1.Second sealing ring 92
Setting ensure that the sealing between swivel nut 2 and valve body 1, also for the stable operation for ensureing flow valve.
Operation principle：
This flow valve is a kind of normally open valve, i.e., turns on and formed when proportion electro-magnet must not be electric, between the B mouths and A mouths of valve body 1
Passage, the increase of proportion electro-magnet control voltage signal, the flow of A mouths B mouths will be gradually reduced is led to, it is maximum to give proportion electro-magnet
Control signal, pilot valve 5 will be withstood on the second damping hole 8a, 8a sealed, and main valve plug 8 is closed in the presence of B mouth pressure,
B mouths end without flow to A mouths.
This flow valve in the side wall of swivel nut 2 by offering in the first damping hole 2a and pilot valve 5 and positioning sleeve 6
The throttle orifice 6a of heart cooperation, hydraulic pressure Type B half-bridge is formed to adjust the pressure of pressure feedback chamber 61, so as to by the B mouths of valve body 1
Load change be transferred in pilot valve 5, i.e., the pressure differential between pressure feedback chamber 61 and hydraulic control chamber 62 is applied to elder generation
On guide valve core 5, move up and down it；The up and down motion of pilot valve 5 is transferred to the rank in proportion electro-magnet 31 by push rod 4 again
On iron 32, so that displacement caused by armature 32 in proportion electro-magnet 31 and load change produce correlation.
B mouth oil-feeds, after proportion electro-magnet 31 gives certain voltage, proportion electro-magnet 31 produces certain suction, rank
The elastic force for overcoming spring 52 is produced certain displacement by iron 32, armature 32 to be moved through push rod 4 downward by pilot valve 5
Push away, i.e., pilot valve 5 moves to the second damping hole 8a directions are closed；Now, pressure rises in hydraulic control chamber 62, and this pressure difference is made
With on the step surface on the top of main valve plug 8, promote main valve plug 8 to push down on, reduce the opening of main valve plug 8；And with main valve plug 8
Move down, the distance between damping hole 8a of pilot valve 5 and second increases, a part of pressure in hydraulic control chamber 62 is from second
Released in damping hole 8a, reduce the pressure in hydraulic control chamber 62, main valve plug 8 moves up, with moving up for main valve plug 8, guide
The distance between damping hole 8a of valve element 5 and second reduces, and the pressure released is reduced, the pressure increase in hydraulic control chamber 62, such as
This circulation, is finally reached dynamic equilibrium.In flow valve running, 31 making alive increases of proportion electro-magnet, armature 32
Distance increase is moved down, the opening of main valve plug 8 just reduces, therefore can adjust master by adjusting on comparative example electromagnet 31 voltage
The openings of sizes of valve element 8.
If proportion electro-magnet 31 gives certain voltage, in the case of load stabilization, the openings of sizes of main valve plug 8 will
Keep constant.Pressure difference feedback is introduced by the setting of pilot valve 5, to reach flow constant purpose when load changes.When negative
Increase is carried, the pressure of B mouths enters pressure feedback chamber 61 by the first damping hole 2a makes its pressure rise before this, does so used in guide
Active force increase on valve element 5, so as to promote pilot valve 5 to move down, and then increases throttle orifice 6a area of passage, saves
Discharge orifice 6a area of passage increase latter aspect rises the pressure of hydraulic control chamber 62, on the other hand makes pressure feedback chamber 61
Pressure is reduced, and after such pilot valve 5 quickly reaches new poised state, main valve plug 8 is opened due to the Pressure difference feedback of pilot valve 5
Mouth reduces.On the contrary, when B mouths pressure declines, load reduces, and the pressure of pressure feedback chamber 61 reduces, then acts in pilot valve 5
Active force also reduce so that pilot valve 5 moves up, and then reduces throttle orifice 6a area of passage, throttle orifice 6a
Area of passage, which reduces latter aspect, has risen the pressure of pressure feedback chamber 61, on the other hand makes the pressure of hydraulic control chamber 62
It has been declined that, after such pilot valve 5 quickly reaches new poised state, main valve plug 8 is opened due to the Pressure difference feedback of pilot valve 5
Mouth increase.To sum up, by Pressure difference feedback, when load increases, the opening of main valve plug 8 reduces；When load reduces, main valve plug 8 is opened
Mouth increase, by reasonably setting pilot valve 5 and throttle orifice 6a, can reach the effect for the flow constant that A mouths are flowed to by B
Fruit.
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 (8)
1. a kind of normally opened ratio one-way flow valves, including valve body (1), described valve body is provided with A mouths and B mouths on (1), and it is special
Sign is：The top of described valve body (1) is bolted with swivel nut (2), and the top of described swivel nut (2) is equipped with proportion electro-magnet
(31), the proportion electro-magnet (31) is provided centrally with armature (32), the lower end of described armature (32) by a push rod (4) with
The pilot valve (5) being arranged in the swivel nut (2) offsets cooperation, the top and baffle ring (51) of described pilot valve (5) it
Between be provided with spring (52), the lower end of described pilot valve (5) passes through the throttle orifice (6a) at positioning sleeve (6) center, described
Pressure feedback chamber (61) is provided with above throttle orifice (6a), hydraulic control chamber is provided with below described throttle orifice (6a)
(62)；Valve pocket (7) is provided with below the positioning sleeve (6) in described valve body (1), valve pocket (7) are provided centrally with
Main valve plug (8), the lower oilhole (7b) for being provided with the side oilhole (7a) communicated with B mouths and being communicated with A mouths on described valve pocket (7),
The first damping hole (2a) is offered in the side wall of described swivel nut (2), described the first damping hole (2a) is connected with B mouths, institute
The center for the main valve plug (8) stated offers the second damping hole (8a), described the second damping hole (8a) and the lower oilhole (7b)
It is connected；Change the aperture of throttle orifice on positioning sleeve (6) by the up and down motion of pilot valve (5)；Make main valve plug (8) in B
When pressure becomes big on mouth, reduce opening, B mouths pressure becomes hour, main valve plug (8) opening increase, constantly regulate and to reach dynamic flat
Weighing apparatus, and then keep stability of flow during B mouth pressure changes.
2. a kind of normally opened ratio one-way flow valves according to claim 1, it is characterized in that：Described main valve plug (8) it is upper
Portion is in terraced structure.
3. a kind of normally opened ratio one-way flow valves according to claim 2, it is characterized in that：Under described main valve plug (8)
End is provided with inclined-plane, and the inclined-plane is engaged with the lower oilhole (7b).
4. a kind of normally opened ratio one-way flow valves according to claim 3, it is characterized in that：Described throttle orifice (6a) it is upper
Portion, which expands, is formed with taper hole (6b).
5. a kind of normally opened ratio one-way flow valves according to claim 4, it is characterized in that：Described pilot valve (5)
Top is provided with bulge loop (53), and the upper end and the lower surface of the bulge loop (53) of described spring (52) offset.
6. a kind of normally opened ratio one-way flow valves according to claim 5, it is characterized in that：Described pilot valve (5) is outside
Spacer (54) is provided with, described baffle ring (51) is fixed on the bottom of the spacer (54).
7. a kind of normally opened ratio one-way flow valves according to claim 6, it is characterized in that：The lower end of described valve pocket (7)
The first sealing ring (91) is provided between the valve body (1).
8. a kind of normally opened ratio one-way flow valves according to claim 7, it is characterized in that：The middle part of described swivel nut (2)
The second sealing ring (92) is provided between the valve body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710975695.9A CN107504006B (en) | 2017-10-19 | 2017-10-19 | A kind of normally opened ratio one-way flow valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710975695.9A CN107504006B (en) | 2017-10-19 | 2017-10-19 | A kind of normally opened ratio one-way flow valves |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107504006A true CN107504006A (en) | 2017-12-22 |
| CN107504006B CN107504006B (en) | 2019-07-09 |
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ID=60701182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710975695.9A Active CN107504006B (en) | 2017-10-19 | 2017-10-19 | A kind of normally opened ratio one-way flow valves |
Country Status (1)
| Country | Link |
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| CN (1) | CN107504006B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107542719A (en) * | 2017-10-24 | 2018-01-05 | 宁波文泽机电技术开发有限公司 | Normally opened ratio one-way flow valves |
| CN109973456A (en) * | 2019-04-16 | 2019-07-05 | 武汉科技大学 | A kind of automatically controlled high pressure check valve of combined type |
| CN113864266A (en) * | 2021-09-10 | 2021-12-31 | 日照海卓液压有限公司 | Integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve |
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| CN101124525A (en) * | 2005-02-11 | 2008-02-13 | Hydac流体技术有限公司 | Valve, especially proportional pressure control valve |
| CN201322117Y (en) * | 2008-08-08 | 2009-10-07 | 宁波市鄞州通力液压电器厂 | Proportional overflow valve |
| US20110139260A1 (en) * | 2009-12-10 | 2011-06-16 | Hydraforce, Inc. | Proportional Motion Control Valve |
| CN103470561A (en) * | 2013-09-03 | 2013-12-25 | 浙江大学 | Proportional overflow valve |
| US20140026985A1 (en) * | 2011-03-22 | 2014-01-30 | Parker-Hannifin Corporation | Electro-proportional pilot operated poppet valve with pressure compensation |
| US20160326721A1 (en) * | 2013-12-26 | 2016-11-10 | Doosan Infracore Co., Ltd. | Pressure peak reduction valve for excavator and pressure peak reduction system for excavator comprising same |
-
2017
- 2017-10-19 CN CN201710975695.9A patent/CN107504006B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101124525A (en) * | 2005-02-11 | 2008-02-13 | Hydac流体技术有限公司 | Valve, especially proportional pressure control valve |
| CN201322117Y (en) * | 2008-08-08 | 2009-10-07 | 宁波市鄞州通力液压电器厂 | Proportional overflow valve |
| US20110139260A1 (en) * | 2009-12-10 | 2011-06-16 | Hydraforce, Inc. | Proportional Motion Control Valve |
| US20140026985A1 (en) * | 2011-03-22 | 2014-01-30 | Parker-Hannifin Corporation | Electro-proportional pilot operated poppet valve with pressure compensation |
| CN103470561A (en) * | 2013-09-03 | 2013-12-25 | 浙江大学 | Proportional overflow valve |
| US20160326721A1 (en) * | 2013-12-26 | 2016-11-10 | Doosan Infracore Co., Ltd. | Pressure peak reduction valve for excavator and pressure peak reduction system for excavator comprising same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107542719A (en) * | 2017-10-24 | 2018-01-05 | 宁波文泽机电技术开发有限公司 | Normally opened ratio one-way flow valves |
| CN109973456A (en) * | 2019-04-16 | 2019-07-05 | 武汉科技大学 | A kind of automatically controlled high pressure check valve of combined type |
| CN113864266A (en) * | 2021-09-10 | 2021-12-31 | 日照海卓液压有限公司 | Integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve |
| CN113864266B (en) * | 2021-09-10 | 2024-01-09 | 日照海卓液压有限公司 | Integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve |
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| Publication number | Publication date |
|---|---|
| CN107504006B (en) | 2019-07-09 |
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Effective date of registration: 20190612 Address after: 311400 Hengwu 130, Hongzhuang Village, Yinhu Street, Fuyang District, Hangzhou City, Zhejiang Province Applicant after: Hangzhou Fuyang Central Asia Valve Industry 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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