CN104295781B - Safety throttle valve - Google Patents
Safety throttle valve Download PDFInfo
- Publication number
- CN104295781B CN104295781B CN201410551200.6A CN201410551200A CN104295781B CN 104295781 B CN104295781 B CN 104295781B CN 201410551200 A CN201410551200 A CN 201410551200A CN 104295781 B CN104295781 B CN 104295781B
- Authority
- CN
- China
- Prior art keywords
- cavity volume
- valve
- radial hole
- valve core
- hole
- 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.)
- Active
Links
Classifications
-
- 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
- F16K17/044—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 with more than one spring
-
- 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
- F16K17/0473—Multiple-way safety 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The present invention relates to a kind of safety throttle valve, including valve body, poppet valve core and valve core of the spool valve, there is in valve body the first cavity volume and the second cavity volume, poppet valve core is arranged in the first cavity volume, valve core of the spool valve is arranged in the second cavity volume, spring one is provided between poppet valve core and valve body, radial hole one is provided with valve body, the 3rd cavity volume and the 4th cavity volume is axially arranged with valve core of the spool valve, valve core of the spool valve is provided with radial hole two and radial hole three, radial hole two is connected with the 3rd cavity volume, radial hole three is connected with the 4th cavity volume, damping hole is provided between 3rd cavity volume and the 4th cavity volume, spring two is additionally provided with second cavity volume, radial hole one is connected with the T mouths being connected with fuel tank, inclined hole is provided with valve body, inclined hole one end is connected with the first cavity volume, the other end is connected with T mouths.Safety throttle valve of the present invention, while have the effect of universal protection valve and general throttle valve, compact conformation concurrently, it is only necessary to an installing hole, easy for installation, and override pressure is little, and regulation precision is high, throttle valve adjustment stability of flow.
Description
Technical field
A kind of a kind of the present invention relates to valve, more particularly to safety throttle valve.
Background technology
Common safety valve is closed in hydraulic system normal work, only when system pressure is more than or equal to peace
Overflow is just opened during full valve set pressure, overload protective function is risen to system, during conventional throttle valve, valve is made by means of controlling organization
Core is moved relative to valve body hole, adjusts output flow to change the area of passage of valve port.
Not only need to control flow but also need control pressure in the runner of some occasions of Hydraulic Field, and peace generally used now
Full valve and choke valve are all single valve body structures, need two installing holes, and the setting precision of flow and pressure is not high.
Content of the invention
The technical problem to be solved in the present invention is：In order to solve the above problems, the present invention provides a kind of safety throttle valve and comes
Solve the above problems.
The technical solution adopted for the present invention to solve the technical problems is a kind of safety throttle valve, including valve body, poppet valve core
And valve core of the spool valve, there is the first cavity volume and the second cavity volume, described poppet valve core to be arranged in the first cavity volume, institute in described valve body
The valve core of the spool valve that states is arranged in the second cavity volume, and described poppet valve core is used for intercepting and connecting the first cavity volume and the second cavity volume, institute
It is provided with spring one between the poppet valve core that states and valve body and spring one acts on the big end in section of the poppet valve core, described
Radial hole one is provided with valve body, is axially arranged with the 3rd cavity volume and the 4th cavity volume, described valve core of the spool valve in described valve core of the spool valve
Radial hole two and radial hole three is provided with, described radial hole two is connected with the 3rd cavity volume, described radial hole three and the 4th cavity volume
Connection, is provided between the 3rd described cavity volume and the 4th cavity volume for controlling the damping hole of flow, in the second described cavity volume
Spring two is additionally provided with, described spring two acts on valve core of the spool valve near one end of the 4th cavity volume；
Described radial hole one is connected with the T mouths being connected with fuel tank, is provided with inclined hole, described inclined hole one on described valve body
End is connected with the first cavity volume, and the other end is connected with T mouths.
Described radial hole three has 2, is circumferentially distributed on valve core of the spool valve.
Described radial hole two has 4, is circumferentially distributed on valve core of the spool valve.
The area of section at described valve core of the spool valve axial direction two ends is equal.
When the pressure of the 3rd cavity volume is less than the spring force of spring one, poppet valve core is closed, and the first cavity volume and the second cavity volume are not
Connection, the hydraulic fluid pressure to the right of the 3rd cavity volume and the spring force and the second cavity volume to the left of spring two hydraulic fluid pressure to the left
Balance is kept, the radial hole three of valve core of the spool valve is corresponding with radial hole on valve body one, fluid approach damping hole, radial hole three, radially
Hole one flows to T mouths.
When the pressure of the 3rd cavity volume is more than the spring force of spring one, poppet valve core is opened, the first cavity volume, the second cavity volume, oil
Case T mouths are connected, and the second chamber pressure reduces, and valve core of the spool valve is slided in the presence of the hydraulic fluid pressure to the right of the 3rd cavity volume to the right
Dynamic, the radial hole two of valve core of the spool valve is corresponding with the radial hole one on valve body, and fluid approach radial hole two, radial hole one flows to T mouths.
The invention has the beneficial effects as follows, safety throttle valve of the present invention, while have universal protection valve and general throttle valve concurrently
Effect, compact conformation a, it is only necessary to installing hole is easy for installation, and override pressure is little, and regulation precision is high, throttle valve adjustment
Stability of flow.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural representation of safety throttle valve optimum embodiment of the present invention.
1, valve body in figure, 2, poppet valve core, 3, spring one, 4, valve core of the spool valve, 5, spring two, 6, filter screen, 7-1, the first pad,
7-2, the second pad, 8, spiral back-up ring, 1-K1, radial hole one, 1-K2, inclined hole, 1-R1, the first cavity volume, 1-R2, the second cavity volume,
4-R3, the 3rd cavity volume, 4-R4, the 4th cavity volume, 4-K1, radial hole three, 4-K2, radial hole two, 4-K3, damping hole.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are simplified schematic diagram, only with
The basic structure of the illustration explanation present invention, therefore which only shows the composition relevant with the present invention.
As shown in figure 1, a kind of safety throttle valve of the invention, including valve body 1, poppet valve core 2 and valve core of the spool valve 4, tool in valve body 1
There are the first cavity volume 1-R1 and the second cavity volume 1-R2, poppet valve core 2 to be arranged in the first cavity volume 1-R1, valve core of the spool valve 4 is arranged on second
In cavity volume 1-R2, poppet valve core 2 is used for intercepting and connecting the first cavity volume 1-R1 and the second cavity volume 1-R2,1 inwall of poppet valve core 2 and valve body
Between be provided with spring 1 and spring 1 acts on the big end in section of poppet valve core 2, be provided with one 1- of radial hole on valve body 1
K1, is provided with the 3rd cavity volume 4-R3 and the 4th cavity volume 4-R4 in valve core of the spool valve 4 vertically, and valve core of the spool valve 4 is provided with two 4-K2 of radial hole
With three 4-K1 of radial hole, two 4-K2 of radial hole connected with the 3rd cavity volume 4-R3, and three 4-K1 of radial hole is connected with the 4th cavity volume 4-R4,
It is provided between 3rd cavity volume 4-R3 and the 4th cavity volume 4-R4 for controlling in the damping hole 4-K3 of flow, the second cavity volume 1-R2 also
Spring 25 is provided with, spring 25 acts on valve core of the spool valve 4 near one end of the 4th cavity volume 4-R4；One 1-K1 of radial hole is connected with
The T mouths being connected with fuel tank, are provided with inclined hole 1-K2 on described valve body 1, inclined hole 1-K2 one end is connected with the first cavity volume 1-R1, another
End is connected with T mouths.
Three 4-K1 of radial hole has 2, is circumferentially distributed on valve core of the spool valve 4.Two 4-K2 of radial hole has 4, is circumferentially distributed on
On valve core of the spool valve 4.The area of section at 4 axial two ends of valve core of the spool valve is equal.
When the 3rd cavity volume 4-R3 pressure less than spring 1 spring force when, poppet valve core 2 is closed, the first cavity volume 1-R1 and
Second cavity volume 1-R2 is not connected, the hydraulic fluid pressure to the right of the 3rd cavity volume 4-R3 and the spring force and second to the left of spring 25
Cavity volume 1-R2 hydraulic fluid pressures to the left keep balance, three 4-K1 of radial hole of valve core of the spool valve 4 and one 1-K1 of radial hole on valve body 1
Corresponding, the fluid approach damping hole 4-K3 in the 3rd cavity volume 4-R3, three 4-K1 of radial hole, one 1-K1 of radial hole flow to T mouths.
When the 3rd cavity volume 4-R3 pressure more than spring 1 spring force when, poppet valve core 2 is opened, the first cavity volume 1-R1, the
Two cavity volume 1-R2, T mouths are connected, and the second cavity volume 1-R2 pressure reduces, to the right hydraulic oil pressure of the valve core of the spool valve 4 in the 3rd cavity volume 4-R3
Slided in the presence of power to the right, two 4-K2 of radial hole of valve core of the spool valve 4 is corresponding with one 1-K1 of radial hole on valve body 1, the 3rd holds
Two 4-K2 of fluid approach radial hole in the 4-R3 of chamber, one 1-K1 of radial hole flow to T mouths.
A kind of safety throttle valve is also included for filtering the filter screen 6 of impurity in fluid, for fixing the first pad of filter screen 6
7-1, the second pad 7-2 and spiral back-up ring 8；
Operation principle：One 1-K1 of radial hole is provided with valve body 1, and 4 two ends active area of valve core of the spool valve is equal, valve core of the spool valve 4
On be provided with two row's radial holes, first row is three 4-K1 of radial hole, has 2, is circumferentially distributed on valve core of the spool valve 4, and second row is provided with
Two 4-K2 of radial hole, has 4, is circumferentially distributed on valve core of the spool valve 4, and is axially sequentially provided with the 3rd appearance inside valve core of the spool valve 4
Chamber 4-R3, for controlling flow damping hole 4-K3, the 4th cavity volume 4-R4, when the 3rd cavity volume 4-R3 pressure less than poppet valve core 2 on
Return spring force when, poppet valve core 2 is not opened, now valve core of the spool valve 4 in the 3rd cavity volume 4-R3 hydraulic fluid pressures to the right, to the left
Return spring force and the second cavity volume 1-R2 hydraulic fluid pressure to the left in the presence of keep balance, now the first cavity volume 1-R1
Fluid passes sequentially through damping hole 4-K3 inside valve core of the spool valve 4, two three 4-K1 of radial hole, valves of the first row of valve core of the spool valve 4
Radial hole 1-K1 on body 1, eventually flows to the T mouths connected with fuel tank, now by the damping hole 4-K3's inside valve core of the spool valve 4
Flow is firm discharge, plays a part of general throttle valve.
Inclined hole 1-K2 is provided with valve body 1, makes the first cavity volume 1-R1 and the T mouths connection for being connected fuel tank, as the 3rd cavity volume 4-R3
Pressure more than return spring force on poppet valve core 2 when, poppet valve core 2 is opened, the second cavity volume 1-R2 and the first cavity volume 1- of valve body 1
R1 is connected, and then is connected with the T mouths for being connected fuel tank, and now the second cavity volume 1-R2 pressure of valve body 1 reduces, then on valve core of the spool valve 4
Second cavity volume 1-R2 hydraulic fluid pressures to the left reduce, and valve core of the spool valve 4 moves right in valve body 2, have blocked valve core of the spool valve 4 the
The connection situation of one 1-K1 of radial hole on two three 4-K1 of radial hole of one row and valve body 1, i.e., fluid is without valve core of the spool valve 4
Internal damping hole 4-K3, now four radial holes two of the fluid of the 3rd cavity volume 4-R3 by the second row on valve core of the spool valve 4
4-K2, flows directly into the T mouths connected with fuel tank, and now flow is larger, serves the effect of safety valve.
With the above-mentioned desirable embodiment according to the present invention as enlightenment, by above-mentioned description, relevant staff is complete
Various change and modification can be carried out entirely in the range of without departing from this invention technological thought.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to determine its technical scope according to right.
Claims (6)
1. a kind of safety throttle valve, is characterized in that：Including valve body (1), poppet valve core (2) and valve core of the spool valve (4), described valve body
(1) there is in the first cavity volume (1-R1) and the second cavity volume (1-R2), described poppet valve core (2) to be arranged on the first cavity volume (1-R1)
Interior, described valve core of the spool valve (4) is arranged in the second cavity volume (1-R2), and described poppet valve core (2) is used for intercepting and connecting first
Cavity volume (1-R1) and the second cavity volume (1-R2), are provided with spring one (3) between described poppet valve core (2) and valve body (1) inwall, and
Spring one (3) acts on the big end in section of the poppet valve core (2), is provided with radial hole one (1-K1) on described valve body (1),
Threeth cavity volume (4-R3) and fourth cavity volume (4-R4), described valve core of the spool valve (4) are provided with vertically in described valve core of the spool valve (4)
Radial hole two (4-K2) and radial hole three (4-K1) is provided with, described radial hole two (4-K2) is connected with the 3rd cavity volume (4-R3),
Described radial hole three (4-K1) is connected with the 4th cavity volume (4-R4), the 3rd described cavity volume (4-R3) and the 4th cavity volume (4-R4)
Between be provided with for controlling the damping hole (4-K3) of flow, is additionally provided with spring two (5) in described the second cavity volume (1-R2),
Described spring two (5) acts on valve core of the spool valve (4) near one end of the 4th cavity volume (4-R4)；
Described radial hole one (1-K1) is connected with the T mouths being connected with fuel tank, is provided with inclined hole (1-K2) on described valve body (1),
Described inclined hole (1-K2) one end is connected with the first cavity volume (1-R1), and the other end is connected with T mouths.
2. safety throttle valve according to claim 1, is characterized in that：Described radial hole three (4-K1) has 2, circumferential uniform
On valve core of the spool valve (4).
3. safety throttle valve according to claim 1, is characterized in that：Described radial hole two (4-K2) has 4, circumferential uniform
On valve core of the spool valve (4).
4. safety throttle valve according to claim 1, is characterized in that：The section face at described valve core of the spool valve (4) axial direction two ends
Product is equal.
5. safety throttle valve according to claim 1, is characterized in that：When the pressure of the 3rd cavity volume (4-R3) is less than spring one
(3) during spring force, poppet valve core (2) is closed, and the first cavity volume (1-R1) is not connected with the second cavity volume (1-R2), the 3rd cavity volume (4-
R3 hydraulic fluid pressure to the right) and the spring force and the second cavity volume (1-R2) to the left of spring two (5) hydraulic fluid pressure to the left
Balance is kept, the radial hole three (4-K1) of valve core of the spool valve (4) is corresponding with the upper radial hole one (1-K1) of valve body (1), the 3rd cavity volume (4-
R3 fluid approach damping hole (4-K3), radial hole three (4-K1) in), radial hole one (1-K1) flow to T mouths.
6. safety throttle valve according to claim 1, is characterized in that：When the pressure of the 3rd cavity volume (4-R3) is more than spring one
(3) during spring force, poppet valve core (2) is opened, the first cavity volume (1-R1), the second cavity volume (1-R2), the connection of T mouths, the second cavity volume (1-
R2) pressure reduces, and valve core of the spool valve (4) is slided in the presence of the hydraulic fluid pressure to the right of the 3rd cavity volume (4-R3) to the right, guiding valve
The radial hole two (4-K2) of valve element (4) is corresponding with the radial hole one (1-K1) on valve body (1), the fluid in the 3rd cavity volume (4-R3)
Approach radial hole two (4-K2), radial hole one (1-K1) flow to T mouths.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410551200.6A CN104295781B (en) | 2014-10-16 | 2014-10-16 | Safety throttle valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410551200.6A CN104295781B (en) | 2014-10-16 | 2014-10-16 | Safety throttle valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104295781A CN104295781A (en) | 2015-01-21 |
| CN104295781B true CN104295781B (en) | 2017-03-15 |
Family
ID=52315635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410551200.6A Active CN104295781B (en) | 2014-10-16 | 2014-10-16 | Safety throttle valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104295781B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6464036B2 (en) * | 2015-06-03 | 2019-02-06 | Ｋｙｂ株式会社 | Damping valve and shock absorber |
| US10094488B2 (en) * | 2015-11-05 | 2018-10-09 | Fisher Controls International Llc | Balanced valve trim and method of reducing stem forces on a valve stem |
| CN106439145A (en) * | 2016-11-25 | 2017-02-22 | 合肥协力液压科技有限公司 | Hydraulic valve |
| CN116906399B (en) * | 2023-07-17 | 2024-04-19 | 杭州励贝电液科技有限公司 | Hydraulic proportional speed regulating valve |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3315487B2 (en) * | 1993-08-03 | 2002-08-19 | 三輪精機株式会社 | Back pressure valve |
| KR100493325B1 (en) * | 2001-12-18 | 2005-06-07 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | hydraulic relief valve |
| US20030131889A1 (en) * | 2002-01-11 | 2003-07-17 | Kim Jin Wook | Pilot poppet type pressure control valve |
| KR100652875B1 (en) * | 2005-09-15 | 2006-12-01 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | A hydraulic relief valve |
| CN204187068U (en) * | 2014-10-16 | 2015-03-04 | 江苏恒立液压有限公司 | Safety throttle valve |
-
2014
- 2014-10-16 CN CN201410551200.6A patent/CN104295781B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104295781A (en) | 2015-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104295781B (en) | Safety throttle valve | |
| CN107631064B (en) | It can be used for the ratio one-way flow valves of low-load | |
| CN204041597U (en) | A kind of temperature correction valve and there is the crane telescopic system of temperature compensation function | |
| CN101886641A (en) | Balanced valve | |
| CN107923470A (en) | Buffer | |
| CN105909844A (en) | Proportional type proportional pressure reducing valve | |
| CN206234447U (en) | Pilot-operated type balanced valve | |
| CN201396329Y (en) | Hydraulic balance valve | |
| CN202040134U (en) | Cartridge balanced valve | |
| CN102374325A (en) | Intelligent pressure-stabilizing stop-check valve | |
| CN106122551A (en) | The mechanism of size and method for adjustment valve | |
| CN107989848A (en) | A kind of energy-saving sequence valve | |
| CN108825577B (en) | Balance valve with variable hydraulic control ratio | |
| CN201916494U (en) | Multi-step low-pressure regulating valve for small-flow gas | |
| CN105074311A (en) | Fluid-throttling member | |
| CN204187068U (en) | Safety throttle valve | |
| CN105736501B (en) | Unloading valve is overloaded in rotating | |
| CN106438549B (en) | A kind of direct-acting overflow valve | |
| CN205618752U (en) | Take relief valve of shock -absorbing capacity | |
| CN102261354A (en) | Crane hydraulic system and hydraulic balance valve thereof | |
| CN105201946B (en) | Load sensing system Multifunctional load stimulation pressure-control valve | |
| CN209212681U (en) | A kind of constant-pressure control valve with pooling feature | |
| CN203404149U (en) | Valve for preventing inverted rotation of hydraulic motor | |
| CN105422538A (en) | Pressure self-adapted multi-passage equalizing valve | |
| CN205715927U (en) | The big flow solenoid valve of fluid-flywheel clutch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 213167 Wujin high tech Industrial Development Zone, Jiangsu Province, No. long hidden Road, No. 99 Applicant after: JIANGSU HENGLI HYDRAULIC CO., LTD. Address before: 213167 Wujin high tech Industrial Development Zone, Jiangsu Province, No. long hidden Road, No. 99 Applicant before: JIANGSU HENGLI HYDRAULIC CO., LTD. |
|
| COR | Change of bibliographic data | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170519 Address after: 213167 Wujin high tech Industrial Development Zone, Jiangsu Province, No. long hidden Road, No. 99 Co-patentee after: Changzhou Hengli Pneumatic Technology Co. Ltd. Patentee after: JIANGSU HENGLI HYDRAULIC CO., LTD. Address before: 213167 Wujin high tech Industrial Development Zone, Jiangsu Province, No. long hidden Road, No. 99 Patentee before: JIANGSU HENGLI HYDRAULIC CO., LTD. |