CN104565456A - Dual-control flap valve - Google Patents
Dual-control flap valve Download PDFInfo
- Publication number
- CN104565456A CN104565456A CN201410777814.6A CN201410777814A CN104565456A CN 104565456 A CN104565456 A CN 104565456A CN 201410777814 A CN201410777814 A CN 201410777814A CN 104565456 A CN104565456 A CN 104565456A
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- China
- Prior art keywords
- flap valve
- jacking component
- door
- align member
- control
- 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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- 239000012530 fluid Substances 0.000 claims abstract description 7
- 230000009977 dual effect Effects 0.000 claims description 41
- 230000007246 mechanism Effects 0.000 claims description 18
- 230000009471 action Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- 230000002262 irrigation Effects 0.000 description 5
- 238000003973 irrigation Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- F16K15/00—Check valves
- F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
- F16K15/182—Check valves with actuating mechanism; Combined check valves and actuated valves with actuating mechanism
- F16K15/1821—Check valves with actuating mechanism; Combined check valves and actuated valves with actuating mechanism for check valves with a hinged or pivoted closure member
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
The invention discloses a dual-control flap valve. The dual-control flap valve comprises a flap valve seat and a flap valve cover; the upper part of the flap valve cover is hinged to the flap valve seat; a through hole through which a fluid flows is formed in the flap valve seat; the front surface of the flap valve cover covers the through hole; the flap valve also comprises a flap valve control system for controlling the flap valve cover to still be closed and be openable when the pressure inside the flap valve is high; the acting end of the flap valve control system is matched with the flap valve cover. The invention provides the dual-control flap valve which has a function of still being closed when the pressure inside the flap valve is high, and is high in controllability and suitable for a two-way flow channel occasion; the dual-control flap valve which is combined to use can also be applied to a plurality of occasions of which the process flows are required to be subjected to flow splitting treatment, such as a barrage building.
Description
Technical field
The present invention relates to the valve mechanism in a kind of runner, especially a kind of flap valve.
Background technique
Existing flap valve is mainly arranged on rivers limit drainpipe outlet, and a kind of have the inlet non return check valve preventing outer water from pouring in down a chimney function.When rivers tidal level is higher than effluent pipe mouth, and when pressure is greater than overpressure, flap valve panel is closed automatically; When manifold pressure is greater than outer river pressure, flap valve overcomes deadweight and realizes opening, and interior water is arranged outward.
The material of flap valve is divided into the multiple materials such as stainless steel, cast iron, shaped steel, composite material (glass fibre reinforced plastics).The developing direction of existing market flap valve is high-strength light, unlatching is rapid, loss of head is little.
Tradition flap valve is all unidirectional control, and net synchronization capability is better, more in the water outlet application of one-way water pump, can not be applied on two-way pump station.Two-way pump station adopts double-layer double-direction runner, and cutout adopts stop gate and hoist.According to winding type, hydraulic gate hoist parameters in series (SL507-2010, SL508-2010) (Ministry of Water Resources of the People's Republic of China), open a speed and be respectively 1.8 ~ 5m/s, 0.5 ~ 1.5m/s, there is starting gate and open the nonsynchronous shortcoming of water pump.The water impact that pump lock is asynchronous to be caused, overflow, be not very reliable double flow channel submersible pump machine to connection, can cause unit vibration even serious accident, and therefore the scheme arrangement there be limited evidence currently of of double flow channel submersible pump adopts; And the investment such as hoist and annex, Automated condtrol, micro computer monitoring is comparatively large, it is more that pumping plant management drops into energy.For concrete pump station engineering, gate opening/closing equipment investment increases by more than 1/2.
The technological deficiency that existing flap valve exists: function singleness, uncontrollable, the function that do not have flap valve under interior water high pressure still to close.
Summary of the invention
In order to overcome the function singleness of existing flap valve, uncontrollable, the deficiency that do not have flap valve is still closed under interior water high pressure function, reversible passage occasion cannot be applied to, the invention provides a kind of controllability good, there is the function that flap valve under interior water high pressure is still closed, the dual control flap valve being applicable to reversible passage occasion.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of dual control flap valve, comprises flap valve seat and door-slapping cover, hinged with described flap valve seat above described door-slapping cover, and described flap valve seat has the through hole flow through for fluid, the front cover of described door-slapping cover is on described through hole; Described flap valve also comprises still closes and the flap valve control system that can open in order to door-slapping cover under high pressure conditions inside flap valve, and the motion end of described flap valve control system coordinates with described door-slapping cover.
Further, described flap valve control system comprises align member and flap valve control gear, the back side of described door-slapping cover is provided with align member, the offside fixed component of described door-slapping cover hinged seat arranges flap valve control gear, described flap valve control gear comprises jacking component and the driven unit in order to control jacking component expanding-contracting action, the motion end of described driven unit is connected with described jacking component, when described jacking component is positioned at limit position, described jacking component top coordinates with described align member and clamps flap valve seat and door-slapping cover, when described jacking component is positioned at free position, described jacking component top is positioned at outside the unlatching trajectory of described door-slapping cover.The program is external scheme.
Or: described flap valve control system comprises align member, the front of described door-slapping cover is provided with align member, flap valve control gear is arranged at the offside of described flap valve seat hinged seat, described flap valve control gear comprises jacking component and the driven unit in order to control jacking component expanding-contracting action, the motion end of described driven unit is connected with described jacking component, when described jacking component is positioned at limit position, described jacking component top coordinates with described align member and clamps flap valve seat, when described jacking component is positioned at free position, described jacking component top is separated with described align member.The program is built-in scheme.
Further, described driven unit is hydraulic drive mechanism, pneumatic drive mechanism, electromagnetic drive mechanism, electric driving mechanism or mechanical driving mechanism.Described mechanical driving mechanism comprises drive motor, in order to the extending means by being converted to straight line motion.Certainly, other driving mode can also be adopted.
Further again, described dual control flap valve is the associating flap valve of at least two flap valve combinations.As required, each flap valve can be carried out conbined usage.
Described align member is provided with positioning hole, and the top of described jacking component is provided with positioning block, and described positioning block coordinates with described positioning hole.This is conventional fit system, also can adopt other modes.
The back side of described align member and door-slapping cover is in one.Which belongs to one-body molded, can be made by align member in the lump when making flap valve.
Described jacking component is push rod or jacking block.This is conventional selection mode, certainly, also can select other mode.
Technical conceive of the present invention is: can only unidirectionally operate (can open) to overcome traditional flap valve, has and still close and the dual control function that can open under high liquid level (HLL), achieves pump lock and opens bi-directional synchronization function.
For double-layer double-direction flow passage system, when water pump is opened, under fluid pressure effect, dual control flap valve achieves and is similar to that stop gate is opened under different hydraulics, closure function: during dual control flap valve state to be opened, belong to traditional flap valve, therefore net synchronization capability is better than stop gate; During controlled flap valve closed state, under the External Force Acting of flap valve control system, realize cutout function, sealing performance equals to stop gate, and traditional flap valve can only be opened under high liquid level (HLL), can not stop.Dual control flap valve is cheap, structure is simple, reliable, runs with water pump Complete Synchronization, make pumping plant that vibration and overflow accident can not occur, flap valve under the internal water high pressure in market can be met and to remain unchanged closedown and the product demand that can open.
Beneficial effect of the present invention is mainly manifested in: controllability is good, there is interior water high pressure under flap valve still close function, be applicable to reversible passage occasion.The integrated application of two-way flap valve, has revolutionary directive significance to traditional barrage building.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of external dual control flap valve.
Fig. 2 is the schematic diagram of built-in dual control flap valve
Fig. 3 is the schematic diagram of the vertical submersible axial flow pump double-layer double-direction flow passage system of application dual control flap valve.
Fig. 4 is the schematic diagram of the irrigation and drainage sluice of application dual control flap valve.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1 ~ Fig. 4, a kind of dual control flap valve, comprises flap valve seat 1 and door-slapping cover 2, hinged with described flap valve seat 1 above described door-slapping cover 2, and described flap valve seat 1 has the through hole flow through for fluid, the front cover of described door-slapping cover 2 is on described through hole; Described flap valve also comprises still closes and the flap valve control system that can open in order to door-slapping cover under high pressure conditions inside flap valve, and the motion end of described flap valve control system coordinates with described door-slapping cover 2.
Further, described flap valve control system comprises align member 3 and flap valve control gear, the back side of described door-slapping cover 2 is provided with align member 3, the offside fixed component of described door-slapping cover hinged seat arranges flap valve control gear, described flap valve control gear comprises jacking component 4 and the driven unit 5 in order to control jacking component expanding-contracting action, the motion end of described driven unit 5 is connected with described jacking component 4, when described jacking component 4 is positioned at highest order, described jacking component 4 top coordinates (now with described align member 3, flap valve can be made to be in closed condition), when described jacking component 4 is positioned at lowest order, described jacking component 4 top is positioned at described door-slapping cover and opens outside trajectory.The program is external scheme.
Or: described flap valve control system comprises align member 3, the front of described door-slapping cover 2 is provided with align member 3, flap valve control gear is arranged at the offside of described flap valve seat 1 hinged seat, described flap valve control gear comprises jacking component 4 and the driven unit 5 in order to control jacking component expanding-contracting action, the motion end of described driven unit 5 is connected with described jacking component 4, when described jacking component 4 is positioned at limit position, described jacking component 4 top coordinates with described align member 3 and clamps flap valve seat, when described jacking component 4 is positioned at free position, described jacking component 4 top is separated with described align member 3.The program is built-in scheme.
Described driven unit 5 is hydraulic drive mechanism, pneumatic drive mechanism, electromagnetic drive mechanism, electric driving mechanism or mechanical driving mechanism.Described mechanical driving mechanism comprises drive motor, in order to the extending means by being converted to straight line motion.Certainly, other driving mode can also be adopted.
Further again, described dual control flap valve is the associating flap valve of at least two flap valve combinations.As required, each flap valve can be carried out conbined usage.
Described align member 3 is provided with positioning hole, and the top of described jacking component 4 is provided with positioning block, and described positioning block coordinates with described positioning hole.This is conventional fit system, also can adopt other modes.
Described align member 3 is one with the back side of door-slapping cover 2.Which belongs to one-body molded, can be made by align member in the lump when making flap valve.
Described jacking component 3 is push rod or jacking block.This is conventional selection mode, certainly, also can select other mode.
With reference to Fig. 3, the dual control flap valve of the present embodiment is applied to vertical submersible axial flow pump double-layer double-direction flow passage system, the upper drainage side of upper strata runner and on go out to flow side all according to described dual control flap valve, flap valve control system pre-buried on the body construction (external), certain flap valve control system also can be built-in.Flap valve control system can be the schemes such as hydraulic pressure, pneumatic, electromagnetism, electronic or mechanical hanging and releasing device.Controlling flap valve system makes traditional flap valve under high liquid level (HLL), have still closedown and the dual control function that can open.This control system illustrates for hydraulic solution.
First on traditional door-slapping cover 2, be welded with align member 3, pre-buried oil hydraulic cylinder on the body construction, the telescopic end of oil hydraulic cylinder can free-extension as jacking component 4.
The driven unit action of flap valve control system, control to hold out against align member 3 when jacking component 4 extends, now flap valve is locked, and door-slapping cover 2 is still in closed condition under the runner high liquid level (HLL) of upper strata; If when flap valve needs automatically to open, control jacking component 4 and retract to home position (non-evagination dashed lines states), the upper end of jacking component 4 is positioned at flap valve (containing align member 3) and opens beyond trajectory, door-slapping cover 2 is state to be opened because Gravitative Loads is in, once open pump, the synchronous drainage of flap valve.
The flap valve control system of hydraulic solution, especially built-in hydraulic solution, take full advantage of lever principle, simply small and exquisite, easy to process, compact smooth during home position, protection is good, be applicable to all types of flap valve of present situation, power saving is fast automatic, even manual hydraulic pressure installation (can pre-buried small-sized oil pipe, cause the operation of upper structural layer land) also can realize flap valve controlling functions, without the need to fast opening and closing equipment, just can realize pump and the two-way Complete Synchronization operation function of dual control flap valve, solve in two-way pump station, pump lock is opened can not Complete Synchronization or the disabled problem of traditional flap valve.
Vertical submersible axial flow pump is the machine integrated structure of pump, is arranged under water, and it connects affirmative and is not fixedly connected with firmly, in order to avoid vibration and overflow accident, uses vertical submersible axial flow pump, need better net synchronization capability between pump and gate valve in double-layer channel.Vertical submersible axial flow pump double-layer channel, dual control flap valve, the double take-off being applicable to all liq with go out to flow, door pump Complete Synchronization and only need a water pump.
With reference to Fig. 4, the dual control flap valve of the present embodiment is applied in irrigation and drainage sluice.In hydraulic engineering, dual control flap valve can be applicable in the barrage building of retaining, flood control protection against the tide, irrigation, water drainage.Tradition barrage building comprises sluice, rubber dam and shutter dam.By setting up twice mothers and sons dual control flap valve, utilizing the sub-flap valve on mother and sons' dual control flap valve and associating flap valve group, irrigation and drainage automation can be realized; Water drainage or irrigation automation can be realized by setting up one dual control flap valve; The gear flood time of tide, outer water high pressure, dual control flap valve has traditional cut-off water by slap door function, automatically closes, safety labor-saving; By setting up shared bulkhead gate, under hydrostatic action, flap valve can reset and hold out against closedown.Because the lock hole clear width of sluice is generally 0.6 ~ 0.85 river width, dual control flap valve is used to replace the sluice of traditional gate, can with river course with wide, strengthen lock hole outflow capacity, reduce energy-dissipating installation when stream and sluice upstream and downstream connection aileron, without the need to top-out, lock top smooth traffic.Because dual control flap valve is without the need to opening and closing device and top factory building, lock chamber structure is merrily and lightheartedly symmetrical, and load is even, and based process difficulty is saved greatly, the sluice especially on soft soil foundation, can save a large amount of construction investment; Make full use of hydraulics and lever principle, automatic open-close, national electric energy and operating cost can be saved.Use the sluice of two-way flap valve, rubber dam and shutter dam can be substituted, have hydrophilic attractive in appearance, durable in use, easy to maintenance, the feature that operating cost is cheap.The integrated application of two-way flap valve, has revolutionary directive significance to traditional barrage building.
Its three, in the filling-emptying system of lock, dual control flap valve can be opened as required under high liquid level (HLL), and when inside and outside lock chamber, water level is identical, flap valve is closed automatically, and enter " still closed condition ", ship is steadily into and out of lock chamber; In addition, by monitoring " still closed condition ", allocation of ships speed can be accelerated.The tradition filling-emptying system of lock adopts gate to control, and needs hoist equipment, top-out and operating time.Therefore the development of dual control flap valve technology, can replace the filling-emptying system of lock tradition gate within the scope of flap valve (comprising the associating flap valve of some flap valves combination) manufacturing dimension, save hoist quantity, digitized of going forward side by side Fast Monitoring.
Its four, relate to the rainwater in plumbing, sewage, tap water, oil and chemical industry, because of technique need, fluid needs allocation process, for example (,) carry out two or more shunting gates or Valve controlling enter the technological process of lower road.
Finally, the embodiment of dual control flap valve can extend to because of technique needs, from overall to the divided fluid stream gate valve of local, and the dual control function gate valve in way flow.Feature is " dual control ", having and still closes and can open, rely on self gravitation to close when pressure at both sides is identical or external pressure is larger under the high pressure of inner side, and net synchronization capability is good and without the need to opening and closing device.
Claims (8)
1. a dual control flap valve, comprises flap valve seat and door-slapping cover, hinged with described flap valve seat above described door-slapping cover, and described flap valve seat has the through hole flow through for fluid, the front cover of described door-slapping cover is on described through hole; It is characterized in that: described flap valve also comprises still closes and the flap valve control system that can open in order to door-slapping cover under high pressure conditions inside flap valve, and the motion end of described flap valve control system coordinates with described door-slapping cover.
2. dual control flap valve as claimed in claim 1, it is characterized in that: described flap valve control system comprises align member and flap valve control gear, the back side of described door-slapping cover is provided with align member, the offside fixed component of described door-slapping cover hinged seat arranges flap valve control gear, described flap valve control gear comprises jacking component and the driven unit in order to control jacking component expanding-contracting action, the motion end of described driven unit is connected with described jacking component, when described jacking component is positioned at limit position, described jacking component top coordinates with described align member and clamps flap valve seat and door-slapping cover, when described jacking component is positioned at free position, described jacking component top is positioned at outside the unlatching trajectory of described door-slapping cover.
3. dual control flap valve as claimed in claim 1, it is characterized in that: described flap valve control system comprises align member, the front of described door-slapping cover is provided with align member, flap valve control gear is arranged at the offside of described flap valve seat hinged seat, described flap valve control gear comprises jacking component and the driven unit in order to control jacking component expanding-contracting action, the motion end of described driven unit is connected with described jacking component, when described jacking component is positioned at limit position, described jacking component top coordinates with described align member and clamps flap valve seat, when described jacking component is positioned at free position, described jacking component top is separated with described align member.
4. the dual control flap valve as described in one of claims 1 to 3, is characterized in that: described driven unit is hydraulic drive mechanism, pneumatic drive mechanism, electromagnetic drive mechanism, electric driving mechanism or mechanical driving mechanism.
5. the dual control flap valve as described in one of claims 1 to 3, is characterized in that: described dual control flap valve is the associating flap valve of at least two flap valve combinations.
6. the dual control flap valve as described in one of claims 1 to 3, is characterized in that: described align member is provided with positioning hole, and the top of described jacking component is provided with positioning block, and described positioning block coordinates with described positioning hole.
7. the dual control flap valve as described in one of claims 1 to 3, is characterized in that: described align member and door-slapping cover are in one.
8. the dual control flap valve as described in one of claims 1 to 3, is characterized in that: described jacking component is push rod or jacking block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410777814.6A CN104565456B (en) | 2014-12-15 | 2014-12-15 | Dual control flap valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410777814.6A CN104565456B (en) | 2014-12-15 | 2014-12-15 | Dual control flap valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104565456A true CN104565456A (en) | 2015-04-29 |
| CN104565456B CN104565456B (en) | 2017-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410777814.6A Active CN104565456B (en) | 2014-12-15 | 2014-12-15 | Dual control flap valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104565456B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1182775A (en) * | 1997-09-17 | 1999-03-26 | Mitsubishi Heavy Ind Ltd | Swing type check valve |
| CN102563142A (en) * | 2012-02-08 | 2012-07-11 | 张关池 | Improved single-disc adjustable check valve |
| CN202466821U (en) * | 2012-03-01 | 2012-10-03 | 陈穗强 | Auto-control flap valve |
| CN103836232A (en) * | 2014-02-21 | 2014-06-04 | 武汉圣禹排水***有限公司 | Lifting closure flexible flap valve |
| CN103851231A (en) * | 2014-02-21 | 2014-06-11 | 武汉圣禹排水***有限公司 | Round lifting closure flap valve |
| CN204403463U (en) * | 2014-12-15 | 2015-06-17 | 樊建苗 | Dual control flap valve |
-
2014
- 2014-12-15 CN CN201410777814.6A patent/CN104565456B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1182775A (en) * | 1997-09-17 | 1999-03-26 | Mitsubishi Heavy Ind Ltd | Swing type check valve |
| CN102563142A (en) * | 2012-02-08 | 2012-07-11 | 张关池 | Improved single-disc adjustable check valve |
| CN202466821U (en) * | 2012-03-01 | 2012-10-03 | 陈穗强 | Auto-control flap valve |
| CN103836232A (en) * | 2014-02-21 | 2014-06-04 | 武汉圣禹排水***有限公司 | Lifting closure flexible flap valve |
| CN103851231A (en) * | 2014-02-21 | 2014-06-11 | 武汉圣禹排水***有限公司 | Round lifting closure flap valve |
| CN204403463U (en) * | 2014-12-15 | 2015-06-17 | 樊建苗 | Dual control flap valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104565456B (en) | 2017-06-20 |
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Effective date of registration: 20190130 Address after: 310016 No. 185 Qingjiang Road, Hangzhou City, Zhejiang Province Patentee after: SURVEY AND DESIGN INSTITUTE OF THE QIANTANG RIVERADMINISTRATION OF ZHEJIANG PROVINCE Address before: 310012 Taohua River New Village 12-1-302, 82 Huancheng West Road, Xiacheng District, Hangzhou City, Zhejiang Province Patentee before: Fan Jianmiao |
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Address after: 310016 No. 185 Qingjiang Road, Hangzhou City, Zhejiang Province Patentee after: Zhejiang Qiantang River Management Bureau Survey and Design Institute Co.,Ltd. Country or region after: China Address before: 310016 No. 185 Qingjiang Road, Hangzhou City, Zhejiang Province Patentee before: SURVEY AND DESIGN INSTITUTE OF THE QIANTANG RIVERADMINISTRATION OF ZHEJIANG PROVINCE Country or region before: China |