CN220930274U - Double-check backflow preventer convenient for water drainage - Google Patents
Double-check backflow preventer convenient for water drainage Download PDFInfo
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- CN220930274U CN220930274U CN202322684927.9U CN202322684927U CN220930274U CN 220930274 U CN220930274 U CN 220930274U CN 202322684927 U CN202322684927 U CN 202322684927U CN 220930274 U CN220930274 U CN 220930274U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 230000007704 transition Effects 0.000 claims abstract description 79
- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 16
- 230000008676 import Effects 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims 1
- 239000012780 transparent material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 21
- 230000000903 blocking effect Effects 0.000 description 4
- 241000446313 Lamella Species 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The utility model relates to a double-check backflow preventer convenient for water drainage, which belongs to the technical field of backflow preventers and comprises a valve body, wherein a first backflow preventer and a second backflow preventer are arranged on the valve body, an inlet, a transition cavity and an outlet are formed in the valve body, two ends of the transition cavity are respectively communicated with the inlet and the outlet, the first backflow preventer is used for limiting medium flowing from the transition cavity to the inlet, the second backflow preventer is used for limiting medium flowing from the outlet to the transition cavity, the double-check backflow preventer further comprises a water drainage mechanism arranged on the valve body, the water drainage mechanism comprises a water drainage valve connected with the valve body, a first communicating pipe, a second communicating pipe and a third communicating pipe are connected to the water drainage valve and are communicated with each other, one ends of the first communicating pipe, the second communicating pipe and the third communicating pipe, far away from the water drainage valve, are all connected with the valve body, the first communicating pipe is communicated with the inlet, the second communicating pipe is communicated with the transition cavity, and the third communicating pipe is communicated with the outlet. The utility model has the effect of facilitating the evacuation of water located in the transition chamber.
Description
Technical Field
The utility model relates to the technical field of backflow preventers, in particular to a double-check backflow preventer convenient for water drainage.
Background
The double-check backflow preventer is one device comprising double check parts and capable of preventing water from flowing back in water supply pipeline. The utility model patent with the publication number of CN208311570U provides a double-check backflow preventer, which comprises a valve body, a first backflow preventer and a second backflow preventer, wherein an inlet, a transition cavity and an outlet are formed in the valve body, the transition cavity is positioned between the inlet and the outlet, the first backflow preventer is used for limiting water in the transition cavity to flow towards the inlet, and the second backflow preventer is used for limiting water to flow from the outlet towards the transition cavity.
However, in the practical use process, the double-check backflow preventer is found that the water in the transition cavity is not easy to drain, and the first backflow preventing device is easy to damage due to long-term existence of accumulated water in the transition cavity, so that the normal use of the backflow preventer is affected.
Disclosure of utility model
In order to facilitate the evacuation of water located in the transition chamber, the application provides a double-check backflow preventer facilitating the draining of water.
The application provides a double-check backflow preventer convenient for water drainage, which adopts the following technical scheme:
The utility model provides a two non return backflow preventers convenient to sluicing, includes the valve body, be equipped with first backflow preventer and second backflow preventer on the valve body, inlet, transition chamber and export have been seted up on the valve body, transition chamber's both ends communicate with inlet and export respectively, first backflow preventer is used for restricting the medium and flows from transition chamber towards the inlet, second backflow preventer is used for restricting the medium and flows from the export towards transition intracavity, still including the sluicing mechanism who sets up on the valve body, sluicing mechanism includes the sluicing valve of being connected with the valve body, be connected with and communicate first communicating pipe, second communicating pipe and third communicating pipe on the sluicing valve, the one end that the sluicing valve was kept away from to first communicating pipe, second communicating pipe and third communicating pipe all is connected with the valve body, first communicating pipe communicates with the inlet, second communicating pipe communicates with transition chamber, third communicating pipe communicates with the export.
By adopting the technical scheme, the medium is restricted from flowing from the transition cavity to the inlet by the first backflow preventing device, and the medium is restricted from flowing from the outlet to the transition cavity by the second backflow preventing device so as to prevent backflow pollution; when the operator closes the water source flowing towards the outlet, if the double-check backflow preventer fails, continuous water discharge can be realized with the help of the water discharge valve, the first communicating pipe, the second communicating pipe and the third communicating pipe, so as to prevent backflow pollution; the accumulated water in the transition cavity can flow into the outlet through the water stop valve, so that the accumulated water is not easy to exist in the transition cavity.
Preferably, the first backflow preventing device comprises a first valve seat, a main valve clack and a main valve rod, wherein the first valve seat, the main valve clack and the main valve rod are connected with the valve body, the first valve seat is attached to the inner wall of the inlet, the main valve rod and the main valve clack are arranged in the valve body in a sliding mode, a main sliding groove for the main valve rod to slide is formed in the first valve seat in a penetrating mode, the main valve clack is located at one end, close to the transition cavity, of the first valve seat, the main valve rod is connected with the main valve clack, the inlet is communicated with or sealed with the transition cavity after the main valve rod slides, and a main sealing piece for controlling the main valve rod to slide to the main valve clack to attach to the first valve seat is arranged on the first valve seat.
Through adopting above-mentioned technical scheme, when import pressure is big enough, from import flow direction transition intracavity medium can promote main valve lamella to slide to import and transition chamber intercommunication towards the transition intracavity, and when import pressure is less, main valve rod can drive main valve lamella under the effect of main closure piece and slide to blocking the intercommunication between import and the transition chamber and keep the state that main valve lamella and first disk seat laminate to the medium in transition chamber is difficult for flowing into the import.
Preferably, the main closure member comprises a control main spring connected with the first valve seat, the control main spring is sleeved on the main valve rod, a main spring seat is arranged at one end, far away from the main valve clack, of the main valve rod, and one end, far away from the first valve seat, of the control main spring is connected with the main spring seat.
Through adopting above-mentioned technical scheme, make the main valve clack slide to blocking the intercommunication between import and the transition chamber and keeping the state that main valve clack and first disk seat laminate under the cooperation of control main spring and main spring holder for this two non return backflow preventer can be according to the switching between the flow automatic control transition chamber of medium and the import.
Preferably, a first sealing ring is embedded at one end of the main valve flap, which faces the first valve seat, and the first sealing ring abuts against the first valve seat when the main valve flap abuts against the first valve seat.
Through adopting above-mentioned technical scheme, through the setting of first sealing washer, promoted the leakproofness between main valve clack and the first disk seat for the water in the transition chamber is difficult for flowing into the import.
Preferably, the second backflow preventing device comprises a second valve seat connected with the valve body, an auxiliary valve clack and an auxiliary valve rod, the second valve seat is attached to the inner wall of the transition cavity, the auxiliary valve rod and the auxiliary valve clack are arranged in the valve body in a sliding mode, an auxiliary sliding groove for the auxiliary valve rod to slide is formed in the second valve seat in a penetrating mode, the auxiliary valve clack is located at one end, close to the outlet, of the second valve seat, the auxiliary valve rod is connected with the auxiliary valve clack, after the auxiliary valve rod slides, the transition cavity is communicated with or is closed to the outlet, and an auxiliary sealing piece for controlling the auxiliary valve rod to slide to the auxiliary valve clack to attach to the second valve seat is arranged on the second valve seat.
By adopting the technical scheme, when the pressure in the transition cavity is high enough, the medium flowing from the transition cavity to the outlet can push the auxiliary valve clack to slide towards the transition cavity until the outlet is communicated with the transition cavity, and when the pressure in the transition cavity is low, the auxiliary valve rod can drive the auxiliary valve clack to slide to block the communication between the outlet and the transition cavity and keep the state that the auxiliary valve clack is attached to the second valve seat under the action of the auxiliary sealing piece, so that the medium at the outlet is not easy to flow into the transition cavity; the second backflow preventing device has the same structure as the first backflow preventing device, so that the processing difficulty is reduced, and the installation and the disassembly are more convenient.
Preferably, the connection parts of the first valve seat and the valve body and the second valve seat are arranged in a step shape.
Through adopting above-mentioned technical scheme, on the one hand to first disk seat, second disk seat and third disk seat carry out spacingly in the position of valve body, on the other hand promoted the leakproofness between first disk seat, second disk seat and third disk seat and the valve body.
Preferably, exhaust valves are arranged among the first communicating pipe, the second communicating pipe, the third communicating pipe and the valve body.
Through adopting above-mentioned technical scheme, through the setting of discharge valve, not only promoted the leakproofness between first communicating pipe, second communicating pipe and third communicating pipe and the valve body, can be used to the gas in the discharge medium in addition.
Preferably, the first communicating tube, the second communicating tube and the third communicating tube are all made of materials with transparent performance.
Through adopting above-mentioned technical scheme, can judge whether two non return backflow preventer is in the state of normal work from the flow state of medium in first communicating pipe, second communicating pipe and the third communicating pipe, be convenient for judge whether two non return backflow preventer break down.
In summary, the present application includes at least one of the following beneficial technical effects:
1. When the operator closes the water source flowing towards the outlet, if the double-check backflow preventer fails, continuous water discharge can be realized with the help of the water discharge valve, the first communicating pipe, the second communicating pipe and the third communicating pipe, so as to prevent backflow pollution; the accumulated water in the transition cavity can flow into the outlet through the water stop valve, so that the accumulated water is not easy to exist in the transition cavity;
2. the double-check backflow preventer can be judged from the flowing states of the mediums in the first communicating pipe, the second communicating pipe and the third communicating pipe whether to be in a normal working state or not, so that whether the double-check backflow preventer fails or not can be judged conveniently.
Drawings
Fig. 1 is a cross-sectional view of the overall structure of an embodiment of the present application.
Reference numerals illustrate: 1. a valve body; 11. an inlet; 12. a transition chamber; 13. an outlet; 2. a first backflow preventer; 21. a first valve seat; 211. a main chute; 22. a main valve flap; 221. a first seal ring; 23. a main valve rod; 231. a main spring seat; 24. controlling a main spring; 3. a second backflow preventer; 31. a second valve seat; 311. an auxiliary chute; 32. a secondary valve flap; 321. a second seal ring; 33. an auxiliary valve rod; 331. a secondary spring seat; 34. controlling the auxiliary spring; 4. a third valve seat; 41. a sealing gasket; 5. an exhaust valve; 6. a water draining mechanism; 61. a first communication pipe; 62. a second communicating pipe; 63. a third communicating pipe; 64. a water drain valve.
Detailed Description
The present utility model will be described in further detail with reference to fig. 1.
The embodiment of the application discloses a double-check backflow preventer convenient for water drainage, which comprises a valve body 1, wherein a first backflow preventing device 2 and a second backflow preventing device 3 are arranged on the valve body 1, an inlet 11, a transition cavity 12 and an outlet 13 are formed in the valve body 1, the transition cavity 12 is positioned between the inlet 11 and the outlet 13, two ends of the transition cavity 12 are respectively communicated with the inlet 11 and the outlet 13, the first backflow preventing device 2 is used for limiting the medium to flow from the transition cavity 12 towards the inlet 11, and the second backflow preventing device 3 is used for limiting the medium to flow from the outlet 13 towards the inside of the transition cavity 12.
Referring to fig. 1, the first backflow preventing device 2 includes a first valve seat 21, a main valve flap 22, and a main valve stem 23 provided in the valve body 1, the first valve seat 21 being attached to an inner wall of the inlet 11, the main valve stem 23 and the main valve flap 22 being slidably provided in the valve body 1, the main valve flap 22 and the main valve stem 23 being slidably moved in a longitudinal direction of the valve body 1; the first valve seat 21 is provided with a main sliding chute 211 for sliding the main valve rod 23 in a penetrating way, the main sliding chute 211 and the first valve seat 21 are coaxially arranged, and the main valve flap 22 is positioned at one end of the first valve seat 21 close to the transition cavity 12; the main valve clack 22 and the main valve rod 23 are coaxially fixed, and the main valve rod 23 can drive the main valve clack 22 to slide after sliding so that the inlet 11 is communicated with or sealed with the transition cavity 12.
Referring to fig. 1, when the main valve rod 23 slides to the main valve flap 22 to be attached to the first valve seat 21, the main valve flap 22 blocks the communication between the inlet 11 and the transition cavity 12, a main sealing piece for controlling the main valve rod 23 to slide to the main valve flap 22 to be attached to the first valve seat 21 is arranged on the first valve seat 21, the main sealing piece comprises a control main spring 24 fixed to the first valve seat 21, the control main spring 24 is sleeved on the main valve rod 23, a main spring seat 231 is coaxially fixed at one end of the main valve rod 23 far away from the main valve flap 22, one end of the control main spring 24 far away from the first valve seat 21 is fixed to the main spring seat 231, and the main valve rod 23 can be driven to slide to the state that the main valve flap 22 is attached to the first valve seat 21 and the main valve flap 22 is kept attached to the first valve seat 21 by controlling the arrangement of the main spring 24; the main valve clack 22 is embedded with first sealing washer 221 towards the coaxial one end of first disk seat 21, and first sealing washer 221 supports tightly with first disk seat 21 when main valve clack 22 supports tightly with first disk seat 21, has promoted the leakproofness between main valve clack 22 and the first disk seat 21.
When the pressure of the inlet 11 is larger than the elasticity of the control main spring 24, the main valve clack 22 can be pushed to slide into the transition cavity 12 until the inlet 11 is communicated with the transition cavity 12, and the medium in the inlet 11 flows into the transition cavity 12; when the pressure of the inlet 11 is smaller than the elastic force of the control main spring 24, the main valve rod 23 can drive the main valve clack 22 to slide to a state of blocking the communication between the inlet 11 and the transition cavity 12 and keeping the main valve clack 22 and the first valve seat 21 attached under the action of the control main spring 24, and the medium in the transition cavity 12 is not easy to flow into the inlet 11.
Referring to fig. 1, the second backflow preventing device 3 includes a second valve seat 31, a sub-valve flap 32, and a sub-valve stem 33 provided in the valve body 1, the second valve seat 31 being attached to an inner wall of the transition chamber 12, the sub-valve stem 33 and the sub-valve flap 32 being slidably provided in the valve body 1, the sub-valve flap 32 and the sub-valve stem 33 being slidably moved in a longitudinal direction of the valve body 1; the second valve seat 31 is provided with a secondary sliding groove 311 for sliding the secondary valve rod 33 in a penetrating way, the secondary sliding groove 311 and the second valve seat 31 are coaxially arranged, and the secondary valve clack 32 is positioned at one end of the second valve seat 31 close to the outlet 13; the auxiliary valve clack 32 and the auxiliary valve rod 33 are coaxially fixed, and the auxiliary valve rod 33 can drive the auxiliary valve clack 32 to slide after sliding, so that the transition cavity 12 is communicated with or sealed with the outlet 13.
Referring to fig. 1, when the auxiliary valve rod 33 slides to the auxiliary valve clack 32 to be attached to the second valve seat 31, the auxiliary valve clack 32 blocks the communication between the outlet 13 and the transition cavity 12, the second valve seat 31 is provided with an auxiliary closure member for controlling the auxiliary valve rod 33 to slide to the auxiliary valve clack 32 to be attached to the second valve seat 31, the auxiliary closure member comprises a control auxiliary spring 34 fixed to the second valve seat 31, the control auxiliary spring 34 is sleeved on the auxiliary valve rod 33, an auxiliary spring seat 331 is coaxially fixed to one end of the auxiliary valve rod 33 away from the auxiliary valve clack 32, one end of the control auxiliary spring 34 away from the second valve seat 31 is fixed to the auxiliary spring seat 331, and the auxiliary valve rod 33 can be driven to slide to the state that the auxiliary valve clack 32 is attached to the second valve seat 31 and the auxiliary valve clack 32 is kept attached to the second valve seat 31 by setting the control auxiliary spring 34; the second sealing ring 321 is coaxially embedded at one end of the auxiliary valve clack 32 facing the second valve seat 31, and when the auxiliary valve clack 32 abuts against the second valve seat 31, the second sealing ring 321 abuts against the second valve seat 31, so that the tightness between the auxiliary valve clack 32 and the second valve seat 31 is improved.
When the pressure in the transition cavity 12 is larger than the elastic force of the control auxiliary spring 34, the auxiliary valve clack 32 can be pushed to slide towards the outlet 13 until the outlet 13 is communicated with the transition cavity 12, and the medium in the transition cavity 12 flows towards the outlet 13; when the pressure in the transition cavity 12 is smaller than the elastic force of the control auxiliary spring 34, the auxiliary valve rod 33 can drive the auxiliary valve clack 32 to slide to a state of blocking the communication between the outlet 13 and the transition cavity 12 and keeping the auxiliary valve clack 32 and the second valve seat 31 attached, and the medium in the outlet 13 is not easy to flow into the transition cavity 12.
Referring to fig. 1, a third valve seat 4 is further provided in the valve body 1, the third valve seat 4 is attached to the inner wall of the outlet 13, the first valve seat 21, the second valve seat 31 and the third valve seat 4 are all fixed to the valve body 1, the fixing positions of the first valve seat 21, the second valve seat 31 and the third valve seat 4 and the valve body 1 are all arranged in a step shape, on one hand, the positions of the first valve seat 21, the second valve seat 31 and the third valve seat 4 in the valve body 1 are limited, and on the other hand, the tightness among the first valve seat 21, the second valve seat 31 and the third valve seat 4 and the valve body 1 is improved; further, the first valve seat 21, the second valve seat 31 and the third valve seat 4 are each coaxially fitted with a gasket 41 bonded to the valve body 1, and the sealing property between the first valve seat 21, the second valve seat 31 and the third valve seat 4 and the valve body 1 is further improved by the provision of the gasket 41.
Referring to fig. 1, three exhaust valves 5 are fixedly connected to a valve body 1, the three exhaust valves 5 are arranged along the length direction of the valve body 1, and the three exhaust valves 5 are respectively communicated with an inlet 11, a transition cavity 12 and an outlet 13; the valve body 1 is also provided with a water draining mechanism 6, the water draining mechanism 6 comprises a water draining valve 64 fixed with the valve body 1, the water draining valve 64 is connected with and communicated with a first communicating pipe 61, a second communicating pipe 62 and a third communicating pipe 63, and one ends of the first communicating pipe 61, the second communicating pipe 62 and the third communicating pipe 63, which are far away from the water draining valve 64, are respectively connected and communicated with the three exhaust valves 5.
The vent valve 5 is used for evacuating gas in the medium, but can also evacuate accumulated water in the transition cavity 12 in cooperation with the drain valve 64, the first communication pipe 61, the second communication pipe 62 and the third communication pipe 63; the first communication pipe 61, the second communication pipe 62 and the third communication pipe 63 are made of materials with transparent performance, and the working state of the double-check backflow preventer can be judged through the flow of the medium in the first communication pipe 61, the second communication pipe 62 and the third communication pipe 63, so that an operator can maintain the damaged double-check backflow preventer in time.
The implementation principle of the double-check backflow preventer convenient for draining water in the embodiment of the application is as follows: after the double-check backflow preventer is arranged on a circuit, an upstream valve is opened, a medium flows into a transition cavity 12 by pushing the main valve clack 22, then pushes the auxiliary valve clack 32 to flow to an outlet 13, and the medium flows; when the up-flow valve is closed, the main and auxiliary valve flaps 32 are closed in sequence, preventing the medium from flowing backwards.
With the cooperation of the drain valve 64, the first communication pipe 61, the second communication pipe 62, and the third communication pipe 63, not only can the accumulated water in the transition chamber 12 be emptied, but also an operator can judge whether the double check backflow preventer is failed through the medium flows in the first communication pipe 61, the second communication pipe 62, and the third communication pipe 63.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (8)
1. The utility model provides a two non return backflow preventer convenient to sluicing, includes valve body (1), be equipped with first backflow preventer (2) and second backflow preventer (3) on valve body (1), inlet (11), transition chamber (12) and export (13) have been seted up on valve body (1), the both ends in transition chamber (12) communicate with inlet (11) and export (13) respectively, first backflow preventer (2) are used for restricting the medium and flow from transition chamber (12) towards inlet (11), second backflow preventer (3) are used for restricting the medium and flow in export (13) towards transition chamber (12), its characterized in that: still including setting up in the water release mechanism (6) on valve body (1), water release mechanism (6) include water release valve (64) of being connected with valve body (1), be connected on water release valve (64) and communicate there are first communicating pipe (61), second communicating pipe (62) and third communicating pipe (63), the one end that water release valve (64) were kept away from to first communicating pipe (61), second communicating pipe (62) and third communicating pipe (63) all is connected with valve body (1), first communicating pipe (61) and import (11) intercommunication, second communicating pipe (62) and transition chamber (12) intercommunication, third communicating pipe (63) and export (13) intercommunication.
2. The double check backflow preventer for facilitating water drainage according to claim 1, wherein: the first backflow preventing device (2) comprises a first valve seat (21), a main valve flap (22) and a main valve rod (23) which are connected with the valve body (1), the first valve seat (21) is attached to the inner wall of the inlet (11), the main valve rod (23) and the main valve flap (22) are slidably arranged in the valve body (1), a main sliding groove (211) for the main valve rod (23) to slide is formed in the first valve seat (21) in a penetrating mode, the main valve flap (22) is located at one end, close to the transition cavity (12), of the first valve seat (21), the main valve rod (23) is connected with the main valve flap (22), the inlet (11) is communicated with or is closed with the transition cavity (12) after the main valve rod (23) slides, and a main closing piece for controlling the main valve rod (23) to slide to the main valve flap (22) to attach to the first valve seat (21) is arranged on the first valve seat (21).
3. The double check backflow preventer for facilitating water drainage according to claim 2, wherein: the main closure piece comprises a control main spring (24) connected with the first valve seat (21), the control main spring (24) is sleeved on the main valve rod (23), one end, far away from the main valve clack (22), of the main valve rod (23) is provided with a main spring seat (231), and one end, far away from the first valve seat (21), of the control main spring (24) is connected with the main spring seat (231).
4. The double check backflow preventer for facilitating water drainage according to claim 2, wherein: a first sealing ring (221) is embedded at one end of the main valve flap (22) facing the first valve seat (21), and when the main valve flap (22) abuts against the first valve seat (21), the first sealing ring (221) abuts against the first valve seat (21).
5. The double check backflow preventer for facilitating water drainage according to claim 2, wherein: the second backflow prevention device (3) comprises a second valve seat (31), a secondary valve clack (32) and a secondary valve rod (33) which are connected with the valve body (1), the second valve seat (31) is attached to the inner wall of the transition cavity (12), the secondary valve rod (33) and the secondary valve clack (32) are slidably arranged in the valve body (1), a secondary sliding groove (311) for the secondary valve rod (33) to slide is formed in the second valve seat (31) in a penetrating mode, the secondary valve clack (32) is located at one end, close to the outlet (13), of the second valve seat (31), the secondary valve rod (33) is connected with the secondary valve clack (32), the transition cavity (12) is communicated with or is closed after the secondary valve rod (33) slides, and a secondary closure piece for controlling the secondary valve rod (33) to slide to the secondary valve clack (32) to attach to the second valve seat (31) is arranged on the second valve seat (31).
6. The double check backflow preventer for facilitating water drainage according to claim 5, wherein: the connection parts of the first valve seat (21) and the second valve seat (31) and the valve body (1) are arranged in a step mode.
7. The double check backflow preventer for facilitating water drainage according to claim 1, wherein: exhaust valves (5) are arranged among the first communicating pipe (61), the second communicating pipe (62) and the third communicating pipe (63) and the valve body (1).
8. The double check backflow preventer for facilitating water drainage according to claim 1, wherein: the first communicating pipe (61), the second communicating pipe (62) and the third communicating pipe (63) are made of transparent materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322684927.9U CN220930274U (en) | 2023-10-07 | 2023-10-07 | Double-check backflow preventer convenient for water drainage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322684927.9U CN220930274U (en) | 2023-10-07 | 2023-10-07 | Double-check backflow preventer convenient for water drainage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220930274U true CN220930274U (en) | 2024-05-10 |
Family
ID=90941543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322684927.9U Active CN220930274U (en) | 2023-10-07 | 2023-10-07 | Double-check backflow preventer convenient for water drainage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220930274U (en) |
-
2023
- 2023-10-07 CN CN202322684927.9U patent/CN220930274U/en active Active
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