CN110792813A - Anti-freezing exhaust valve - Google Patents
Anti-freezing exhaust valve Download PDFInfo
- Publication number
- CN110792813A CN110792813A CN201911221828.9A CN201911221828A CN110792813A CN 110792813 A CN110792813 A CN 110792813A CN 201911221828 A CN201911221828 A CN 201911221828A CN 110792813 A CN110792813 A CN 110792813A
- Authority
- CN
- China
- Prior art keywords
- valve
- exhaust
- exhaust valve
- air
- freezing
- 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.)
- Pending
Links
- 238000007710 freezing Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 37
- 238000002955 isolation Methods 0.000 claims description 23
- 230000005484 gravity Effects 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 10
- 230000008014 freezing Effects 0.000 claims description 7
- 208000001034 Frostbite Diseases 0.000 claims description 4
- 230000002528 anti-freeze Effects 0.000 claims 2
- 108010053481 Antifreeze Proteins Proteins 0.000 claims 1
- 239000012535 impurity Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/04—Plug, tap, or cock filters filtering elements mounted in or on a faucet
-
- 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
- F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
- F16K24/04—Devices, e.g. valves, for venting or aerating enclosures for venting only
- F16K24/042—Devices, e.g. valves, for venting or aerating enclosures for venting only actuated by a float
-
- 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
- F16K31/18—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
- F16L59/161—Housings for valves, tee pieces, or the like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Self-Closing Valves And Venting Or Aerating Valves (AREA)
Abstract
The invention relates to an anti-freezing exhaust valve which is fixedly arranged on a water pipeline through a cylindrical shell and comprises a cylindrical valve body, a circular valve cover and a valve shaft, wherein the cylindrical valve body is inserted into the shell and fixedly connected with the shell, the circular valve cover is fixed at the upper end face of the valve body and is provided with a central through hole, the valve shaft penetrates through the upper end face and the lower end face of the valve body, the top end of the valve shaft is rotationally operated, and the bottom end of the valve shaft is fixedly provided with a locking nut.
Description
Technical Field
The invention relates to the field of fluid machinery, in particular to an anti-freezing exhaust valve.
Background
The exhaust valve is a device commonly used in the water fluid conveying industry, is used for exhausting air in a pipeline during positive pressure, and can suck air when negative pressure occurs in the pipeline, so that the pipeline is prevented from being damaged by instability, and the exhaust valve plays an important role in ensuring the normal operation of a pipeline system.
The exhaust valves commonly used in the market at present can not adapt to the northern cold climate, and the interior of the exhaust valves is easy to freeze and damage in winter, so that the valves lose the original functions. Special insulation measures are required. In addition, in order to ensure the maintenance of the valve, an isolation valve needs to be arranged in front of the valve, so that the height of an exhaust facility is increased, and the heat preservation of the facility is not facilitated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an anti-freezing exhaust valve.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides an exhaust valve prevents frostbite, sets up on water pipe through the shell of tube-shape is fixed, including the tube-shape valve body that inserts in the shell and with shell fixed connection, fix ring shape valve gap that has central through-hole in valve body up end department and run through the valve shaft of valve body up and down terminal surface, the valve shaft top rotate the operation, the bottom is fixed with lock nut, this exhaust valve prevents frostbite still including setting up the last sealed exhaust mechanism of up end department, setting up the lower sealed exhaust mechanism of terminal surface department under and fix the nut actuating mechanism at valve body lower part inner wall.
The upper sealing exhaust mechanism comprises a valve seat sealing ring fixed at the outer edge of a through hole in the center of the valve cover, and a buoy and an air suction and exhaust valve which are sequentially sleeved outside the valve shaft from top to bottom, wherein the air suction and exhaust valve and the valve seat sealing ring form an upper sealing pair.
The valve seat sealing ring is of an annular structure with a hole in the center, the hole in the center is used for penetrating through the valve shaft, and the valve seat sealing ring is sealed with the valve cover through the sealing ring.
The air suction and exhaust valve is in the shape of an annular plate, a plurality of small hole seats for micro-exhaust are formed in the surface of the air suction and exhaust valve, and downward bends are arranged at the inner edge and the outer edge of the air suction and exhaust valve to increase rigidity and air circulation capacity.
The float bowl is of a fully-closed annular cylindrical structure, the upper end and the lower end of the float bowl are sealed, and the center of the float bowl starts to penetrate through an inner hole of the valve shaft and can slide up and down on the valve shaft.
The buoyancy force of the buoy after the part or the whole buoy is submerged by water is larger than the gravity of the buoy, and the difference between the buoyancy force and the gravity is larger than the gravity of the air suction and exhaust valve, so that the air suction and exhaust valve is pushed upwards to be tightly pressed with the valve seat sealing ring, and the sealing of the upper end surface of the valve body is realized.
The lower sealing exhaust mechanism comprises an isolation/buffer plate which is sleeved on the lower part of the valve shaft and is positioned above the locking nut, and an annular boss which is arranged on the lower end face of the valve body and forms a lower sealing pair with the isolation/buffer plate, a gap is arranged between the lower part of the valve shaft and a through hole in the center of the isolation/buffer plate, and the nut is fastened with the valve shaft.
The nut driving mechanism comprises a boss fixed on the inner wall of the lower portion of the valve body and a driving nut assembly arranged inside the boss, an external thread is formed in the lower portion of the valve shaft, an internal thread corresponding to the external thread is arranged on the inner side of the driving nut assembly, the valve shaft is driven by the nut assembly to move up and down, and the locking nut drives the isolation/buffer plate to form sealing with the annular boss.
The anti-freezing exhaust valve further comprises a filter cylinder arranged at the bottom of the valve body, wherein a plurality of strip-shaped openings are uniformly formed in the circumferential direction of the filter cylinder, and filter screens are arranged at the bottom of the filter cylinder and at the strip-shaped openings to prevent sundries from entering the valve body.
The anti-freezing exhaust valve further comprises an air cover plate arranged at the top of the valve cover and a heat insulation sleeve fixed on the air cover plate through a fastener, so that heat loss caused by air flowing is reduced, and water vapor in the sprayed air is prevented from freezing when trace air is exhausted.
Compared with the prior art, the invention has the following advantages:
firstly, keep apart, be convenient for maintain: most parts of the anti-freezing exhaust valve designed by the invention are arranged in a pipeline for conveying fluid, the valve is prevented from freezing by utilizing the heat energy of the fluid, and meanwhile, the valve is internally provided with the isolating valve, so that the valve can be maintained.
Secondly, the function is comprehensive: the invention can realize large-amount exhaust and micro-amount exhaust simultaneously.
Thirdly, reducing heat loss and preventing freezing: according to the invention, the air cover plate is arranged on the valve cover, the heat insulation sleeve is fixed on the air cover plate through the fastening piece, and the heat loss of the air flowing to the equipment can be effectively reduced through the arrangement of the heat insulation sleeve. Meanwhile, the water vapor in the air sprayed from the small hole seat is prevented from freezing.
Fourthly, sundries prevention: according to the invention, the outer surface of the filter cylinder at the bottom end of the valve body is provided with a plurality of strip-shaped openings, and the strip-shaped openings and the bottom end of the opening of the filter cylinder are sealed by the filter screen, so that sundries are prevented from entering the valve body.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the present invention in a mass exhaust configuration.
Fig. 3 is a schematic view of the present invention in a mass inhalation configuration.
FIG. 4 is a schematic view of the present invention in micro-venting.
Fig. 5 is a partially enlarged view of a portion of fig. 4A.
Fig. 6 is a schematic structural view of the lower seal venting mechanism.
Fig. 7 is a schematic view of the structure of the separator plate when forming a seal.
The notation in the figure is:
1. the valve comprises a valve body, 2, a buoy, 3, a valve cover, 4, an air suction and exhaust valve, 5, a valve seat sealing ring, 6, a valve shaft, 7, an isolation/buffer plate, 8, a small hole seat, 9, a locking nut, 10, an air cover plate, 11, a heat insulation sleeve, 12, a sealing ring, 13, a fastening piece, 14, a driving nut component, 15, a filter screen, 16, a shell, 17, a boss, 18, a water pipeline, 19, an annular boss, 20 and a strip-shaped opening.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
As shown in fig. 1, the present invention provides an anti-freezing exhaust valve, which is mainly composed of the following components:
the valve comprises a valve body 1, a buoy 2, a valve cover 3, an air suction and exhaust valve 4, a valve seat sealing ring 5, a valve shaft 6, an isolation/buffer plate 7, a small hole seat 8, a locking nut 9, an air cover plate 10, a heat insulation sleeve 11, a sealing ring 12, a fastener 13, a driving nut assembly 14, a filter screen 15 and a shell 16.
The float 2 is a totally-enclosed annular cylinder structure, two ends of the float are closed, an annular inner hole of the cylinder body allows the valve shaft 6 to pass through, the buoyancy of the float 2 is larger than the gravity when the float submerges, the difference value between the buoyancy and the gravity is larger than the weight of the air suction and exhaust valve 4, the air suction and exhaust valve 4 is pushed to move upwards, and the air suction and exhaust valve and the valve seat sealing ring 5 are sealed.
The air suction and exhaust valve 4 is of an annular plate structure, the inner edge and the outer edge of the air suction and exhaust valve are bent downwards to increase rigidity and air circulation capacity, the air suction and exhaust valve 4 can slide up and down along the valve shaft 6, and when the air suction and exhaust valve is pushed by buoyancy of the buoy 2 to abut against the valve seat sealing ring 5, sealing is formed, and sealing is formed together under the action of pipeline pressure.
As shown in fig. 2 and 3, when the water pipe 18 needs to be exhausted or sucked in a large amount, the float 2 is in the open position under the influence of its own weight, and the isolating/buffering plate 7 is also in the open position by rotating the valve shaft 6, at this time, the air in the pipe can be exhausted in a large amount or sucked in a large amount.
As shown in fig. 4, three small hole seats 8 are uniformly embedded on the air suction and exhaust valve 4 for discharging a small amount of air, when the water pipe 18 delivers water normally, water enters the inner cavity of the valve body 1 to make the buoy 2 float upwards under stress, the upper plane of the buoy 2 blocks the small holes of the three small hole seats 8 to form sealing, when air is accumulated in the valve, the water level in the valve body 1 drops slightly, the buoy 2 drops along with the water level under the action of gravity, but the air suction and exhaust valve 4 is attached to the sealing surface of the valve seat sealing ring 5 under the action of pressure in the valve and cannot drop along with the buoy 2, the upper plane of the buoy 2 is separated from the small hole seats 8, and the small amount of air.
The valve seat seal 5 has an annular orifice shape, and a hole matching the valve shaft 6 is provided in the center portion thereof to allow the valve shaft 6 to pass therethrough. The sealing ring arranged in the hole and the valve shaft 6 form sealing, and the valve seat sealing ring 5 is fixed on the valve cover 3 through a fastening piece and is sealed with the valve cover through the sealing ring.
The center of the isolation/buffer plate 7 is provided with a hole matched with the valve shaft 6, the isolation/buffer plate 7 can move up and down along the valve shaft 6, and the locking nut 9 at the lower end of the valve shaft 6 prevents the isolation/buffer plate 7 from falling off the valve shaft 6. When the locking nut 9 and the isolating/damping plate 7 are pressed against each other, a seal can be formed.
As shown in fig. 6, the isolation/buffer plate 7 is located at the bottom of the valve under the action of gravity in the normal working state, when a large amount of exhaust air is exhausted, the air density is low, the formed pressure difference is not enough to support the isolation/buffer plate 7, when the exhaust air is exhausted, the isolation/buffer plate 7 is supported due to the relatively high density of water, but a gap exists between the valve shaft 6 and the hole in the middle of the isolation/buffer plate 7, so that water is still allowed to enter the inside of the valve body 1 through the gap to float the buoy 2.
The driving nut component 14 is fixed in a boss 17 on the inner wall of the lower part of the valve body 1, the driving nut component 14 embraces the valve shaft 6, and an internal thread matched with the external thread of the valve shaft 6 is formed in an internal hole of the driving nut component 14, so that the valve shaft 6 is screwed to move up and down, when the valve shaft 6 is screwed to move up, the valve shaft 6 drives the locking nut 9 to support the isolation/buffer plate 7 until the isolation/buffer plate 7 forms a seal with an annular boss 19 on the valve body 1, and meanwhile, the locking nut 9 forms a seal with the isolation/buffer plate 7, as shown in fig. 7. The valve shaft 6 is reversely screwed, the valve shaft 6 descends, the locking nut 9 is released from the sealing of the isolation/buffer plate, the pressure enters the valve body 1, the internal pressure and the external pressure of the valve body 1 are gradually balanced, and the isolation/buffer plate 7 descends under the action of gravity until the initial state is recovered.
A filter cylinder is sleeved on the outer edge of the bottom of the valve body 1, a plurality of strip-shaped openings 20 are formed in the surface of the filter cylinder, and the strip-shaped openings 20 and the openings at the bottom end of the filter cylinder are sealed through a filter screen 15, so that sundries are prevented from entering the valve body.
The anti-freezing exhaust valve is arranged on the top heat insulation sleeve 11 and the air cover plate 10, the heat insulation sleeve 11 is fixed on the air cover plate 10 through a fastener, and the heat loss of air flowing to equipment is reduced by the heat insulation sleeve. Meanwhile, the water vapor in the air sprayed by the small hole seat 8 is prevented from freezing, and the sealing rings 12 are arranged at the required sealing positions.
All internal parts of the invention are positioned in the valve body 1, the valve body 1 is fixed on the shell 16 through the fastening piece 13, and the shell and the water pipeline 18 are fixed by welding.
Claims (10)
1. The utility model provides an exhaust valve prevents frostbite, sets up on conduit (18) through fixed the setting of shell (16) of tube-shape, including insert in shell (16) and with shell (16) fixed connection's tube-shape valve body (1), fix ring shape valve gap (3) that have central through-hole in valve body (1) up end department and run through valve shaft (6) of terminal surface about valve body (1), valve shaft (6) top carry out the rotation operation, the bottom mounting has lock nut (9), its characterized in that, this exhaust valve prevents frostbite still including setting up the last sealed exhaust mechanism of up end department, setting up the lower sealed exhaust mechanism of terminal surface department under and fixing the nut actuating mechanism at valve body (1) lower part inner wall.
2. The anti-freezing exhaust valve according to claim 1, wherein the upper sealing exhaust mechanism comprises a valve seat sealing ring (5) fixed at the outer edge of the central through hole of the valve cover (3), and a buoy (2) and an air suction and exhaust valve (4) which are sequentially sleeved outside the valve shaft (6) from top to bottom, wherein the air suction and exhaust valve (4) and the valve seat sealing ring (5) form an upper sealing pair.
3. An anti-freeze exhaust valve according to claim 2, characterized in that said valve seat seal (5) is a ring structure with a central orifice for passing through the valve shaft (6), and the valve seat seal (5) is sealed with the valve cover (3) by the seal.
4. The antifreeze exhaust valve according to claim 2, characterized in that the air intake and exhaust valve (4) is in the shape of an annular plate, the surface of the air intake and exhaust valve is provided with a plurality of small hole seats (8) for exhausting a small amount of air, and downward bends are arranged at the inner edge and the outer edge to increase rigidity and air circulation capacity.
5. An anti-freezing exhaust valve as claimed in claim 2, characterized in that the float bowl (2) is a fully closed ring-shaped cylindrical structure, the upper and lower ends of which are sealed, the center of which is used to pass through the inner hole of the valve shaft (6) and can slide up and down on the valve shaft (6).
6. The antifreezing vent valve as claimed in claim 5, wherein the buoyancy force applied to the float (2) after being partially or completely submerged in water is greater than the self gravity, and the difference between the buoyancy force and the gravity is greater than the self gravity of the air intake and exhaust valve (4), thereby pushing the air intake and exhaust valve (4) upward to press against the valve seat seal ring (5) to seal the upper end surface of the valve body (1).
7. The anti-freezing exhaust valve according to claim 1, wherein the lower sealing exhaust mechanism comprises an isolation/buffer plate (7) which is sleeved on the lower portion of the valve shaft (6) and is positioned above the locking nut (9), and an annular boss (19) which is arranged on the lower end face of the valve body and forms a lower sealing pair with the isolation/buffer plate (7), a gap is formed between the lower portion of the valve shaft (6) and a through hole in the center of the isolation/buffer plate (7), and the nut (9) is fastened with the valve shaft (6).
8. The anti-freezing exhaust valve according to claim 1, wherein the nut driving mechanism comprises a boss (17) fixed on the inner wall of the lower portion of the valve body (1) and a driving nut assembly (14) arranged inside the boss (17), an external thread is formed at the lower portion of the valve shaft (6), an internal thread corresponding to the external thread is formed inside the driving nut assembly (14), the valve shaft (6) is rotated to drive the valve shaft (6) to move up and down through the nut assembly (14), and the locking nut (9) drives the isolation/buffer plate (7) to form sealing with the annular boss (19).
9. The anti-freezing exhaust valve according to claim 1, characterized in that the anti-freezing exhaust valve further comprises a filter cylinder arranged at the bottom of the valve body (1), the filter cylinder is uniformly provided with a plurality of strip-shaped openings (20) along the circumferential direction, and the filter screens (15) are arranged at the bottom of the filter cylinder and the strip-shaped openings (20) to prevent impurities from entering the valve body (1).
10. The exhaust valve for preventing freezing as claimed in claim 1, further comprising an air cover plate (10) provided on the top of the valve cover (3) and a thermal insulation cover (11) fixed to the air cover plate (10) by a fastening member for reducing heat loss due to air flow while preventing freezing of moisture in the air injected during micro-exhaust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911221828.9A CN110792813A (en) | 2019-12-03 | 2019-12-03 | Anti-freezing exhaust valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911221828.9A CN110792813A (en) | 2019-12-03 | 2019-12-03 | Anti-freezing exhaust valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110792813A true CN110792813A (en) | 2020-02-14 |
Family
ID=69447290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911221828.9A Pending CN110792813A (en) | 2019-12-03 | 2019-12-03 | Anti-freezing exhaust valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110792813A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049971A (en) * | 2020-09-11 | 2020-12-08 | 山东水发黄水东调工程有限公司 | Water hammer preventing air valve capable of being automatically cleaned and using method thereof |
-
2019
- 2019-12-03 CN CN201911221828.9A patent/CN110792813A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049971A (en) * | 2020-09-11 | 2020-12-08 | 山东水发黄水东调工程有限公司 | Water hammer preventing air valve capable of being automatically cleaned and using method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: Tak Road 201802 Shanghai city Jiading District Nanxiang Town, No. 815 Applicant after: Shanghai Guanlong Valve Machinery Co., Ltd Address before: Tak Road 201802 Shanghai city Jiading District Nanxiang Town, No. 815 Applicant before: Shanghai Guanlong Valve Machinery Co.,Ltd. |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: Tak Road 201802 Shanghai city Jiading District Nanxiang Town, No. 815 Applicant after: Shanghai Guanlong valve energy saving equipment Co., Ltd Address before: Tak Road 201802 Shanghai city Jiading District Nanxiang Town, No. 815 Applicant before: Shanghai Guanlong Valve Machinery Co., Ltd |
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| CB02 | Change of applicant information |