CN212318814U - Pneumatic control flushing valve - Google Patents
Pneumatic control flushing valve Download PDFInfo
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- CN212318814U CN212318814U CN202021293467.7U CN202021293467U CN212318814U CN 212318814 U CN212318814 U CN 212318814U CN 202021293467 U CN202021293467 U CN 202021293467U CN 212318814 U CN212318814 U CN 212318814U
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- flow passage
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- 238000011010 flushing procedure Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000007789 sealing Methods 0.000 claims description 23
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000008358 core component Substances 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 5
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Abstract
The utility model relates to a pneumatic control flushing valve, which comprises a base, a top cover and a valve core component, wherein the base and the top cover are fixedly connected; a lower cavity, a water inlet flow passage and a water drainage flow passage are arranged in the base; the water inlet flow channel extends to the middle part of the lower cavity, and the upper end surface on the same side is provided with a lower inner hole which enables the water inlet flow channel to be communicated with the lower cavity; an upper cavity, a pneumatic control flow passage and an upper inner hole are arranged in the top cover; the valve core assembly is arranged in the upper cavity and the lower cavity and comprises an upper valve core, a diaphragm, a lower valve core and a return spring, wherein the upper valve core, the diaphragm and the lower valve core are coaxially arranged, the return spring is sleeved on the outer side of the upper valve core, the upper valve core is nested and matched in an upper inner hole, and the lower valve core can extend into a lower inner hole under the action of the return spring; the utility model discloses constitute by base, top cap and case, structural design is compact, and occupation space is little to make space utilization and part configuration more convenient and easy, the security performance is high simultaneously, reliable performance is high, maintain that maintenance is consuming time few and the expense is low, use not influenced by the environment.
Description
Technical Field
The utility model relates to a flashing valve technical field for vacuum toilet relevant equipment, in particular to gas accuse flashing valve.
Background
The related equipment of the vacuum toilet refers to sanitary equipment such as a vacuum closestool, a vacuum urinal and the like, wherein a flushing valve is one of internal important parts, and the flushing valve in the prior art mainly adopts an electromagnetic water valve technology; more specifically, three schemes are mainly adopted, the first scheme is that an electromagnet is electrified to adsorb an iron core in the electromagnet, and the opening and closing of a diaphragm in the water valve are controlled through the expansion and contraction of the iron core; the second is that the electromagnet is electrified to rotate a spherical valve core rotor in the water valve to close the water valve; the third is to adopt two-position two-way electromagnetic change valve type structure, and the three electromagnetic drive flush valves have the following common problems:
(1) the environment of a vacuum toilet installation site requires that wires, cables and socket strips which are convenient to take and use are required to be configured, a large number of wires and socket strips are required to be used in the later period of the vacuum toilet which is upgraded and reformed in a new rural dry toilet, and the project investment cost is high; meanwhile, the configured wires, cables and power strip have great potential safety hazards, namely the quality problem of the power strip and the cables and the wiring problem are solved;
(2) the electricity utilization environment is unstable, particularly in rural areas in remote areas, such as northwest projects, the power in the rural areas is unstable, and individual places are not electrified in the morning in the evening, so that the electricity utilization environment cannot be used in the period of time or the use effect is influenced;
(3) the power consumption is relatively high, and the first generation vacuum toilet bowl and the competitive vacuum toilet bowl have the problem of power consumption as long as the technical scheme of electric drive is adopted, and particularly have higher power consumption in cold winter climate and extreme weather which is hot and difficult to endure in summer;
(4) potential safety hazards exist, water, particularly flood is forbidden in the use environment of the vacuum closestool in the electric driving process, flood disasters and debris flow natural disasters occur in rural areas, particularly remote mountainous areas, equipment faults can be caused, and the personal safety of users can be threatened;
(5) the vacuum blowoff valve and the flushing water valve in a set of vacuum toilet respectively need an electromagnetic slide valve switch, the number of related accessories (such as pipe joints, throat hoops and the like) is large, the occupied space is large, the appearances of the two electromagnetic valves are almost the same, although one electromagnetic valve is a two-position two-way electromagnetic valve and the other electromagnetic valve is a two-position three-way electromagnetic valve, the increase of the installation number of items can cause connection interference to a certain extent, such as wrong connection of pipelines.
Therefore, the inlet pneumatic control flushing valve appears in the market at present, but the applicable water inlet water pressure range is limited, and the inlet pneumatic control flushing valve is not suitable for water pressure in a wider range, particularly for occasions with larger water pressure fluctuation range in rural areas and water supply pipelines in mountainous areas and hills and villages; therefore the utility model discloses a gas accuse flashing valve has been developed to solve the problem that exists among the prior art, through the retrieval, not discover with the utility model discloses same or similar technical scheme.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the purpose is: the pneumatic control flushing valve is used for solving the problems that an electromagnetic water valve in the prior art is high in input cost, large in potential safety hazard, high in requirement on the use environment and difficult to maintain, and meanwhile, the problem that the use environment is limited due to the fact that the applicable water pressure range of the pneumatic control water valve in the existing market is limited is solved.
The technical scheme of the utility model is that: a pneumatic control flushing valve comprises a base, a top cover and a valve core assembly, wherein the base and the top cover are fixedly connected; a lower cavity, a water inlet flow channel and a water drainage flow channel which are communicated with the lower cavity are arranged in the base; the water inlet flow channel extends to the middle part of the lower cavity, and the upper end surface on the same side is provided with a lower inner hole which enables the water inlet flow channel to be communicated with the lower cavity; an upper cavity, a pneumatic control flow passage communicated with the upper cavity and an upper inner hole are arranged in the top cover; the base and the top cover are internally provided with a side flow passage communicated with the water inlet flow passage and the upper inner hole; the valve core assembly is arranged in the upper cavity and the lower cavity and comprises an upper valve core, a diaphragm, a lower valve core and a return spring, wherein the upper valve core, the diaphragm and the lower valve core are coaxially arranged, and the return spring is sleeved on the outer side of the upper valve core.
Preferably, the lower cavity comprises a first cavity and a second cavity which are coaxially arranged from top to bottom, the inner diameter of the first cavity is larger than that of the second cavity, a step surface is formed at the position of the side wall, and a slot which is annularly arranged is formed in the step surface.
Preferably, the top cover comprises an upper cover body and a lower cover body which are fixedly connected, the upper cavity, the pneumatic control flow channel and the upper inner hole are all arranged in the lower cover body, the upper inner hole and the upper cavity are coaxially arranged and respectively extend to the upper end face and the lower end face of the lower cover body, the lower end of the lower cover body is nested and matched in the first cavity, and a first O-shaped sealing ring is arranged between the lower cover body and the end face, which is in contact with the upper end face of the base; the upper cover body is covered on the upper end face of the lower cover body, and a second O-shaped sealing ring is arranged on the connected end face.
Preferably, the side flow channel comprises a first flow channel arranged in the base and communicated with the water inlet flow channel, a second flow channel arranged in the lower cover body and communicated with the first flow channel, and a notch communicated with the second flow channel and the upper inner hole, and a third O-shaped sealing ring is arranged between the end surfaces of the connecting positions of the first flow channel and the second flow channel; the second flow passage is formed by the side wall of the lower cover body, and a first lip-shaped sealing ring is plugged at the end part of the second flow passage.
Preferably, the upper valve core, the diaphragm and the lower valve core are coaxially arranged and fixedly connected in a penetrating manner through a long rod screw, the upper end of the upper valve core is nested and matched in the upper inner hole, a second lip-shaped sealing ring is arranged in the side wall of the upper inner hole, which is in contact with the upper inner hole, and a reset spring is sleeved on the outer side wall of the upper valve core in the upper cavity; the lower end of the lower valve core can extend into the lower inner hole under the action of a return spring, and a fourth O-shaped sealing ring is arranged between the side wall of the lower end part of the lower valve core and the inner wall of the lower inner hole; the inner side end of the diaphragm is fixed between the upper valve core and the lower valve core, and the side edge which is arranged in an annular shape is bent downwards and is embedded and matched in the slot.
Preferably, the cross-sectional areas of the upper valve core and the lower valve core in the horizontal direction are the same.
Compared with the prior art, the utility model has the advantages that:
(1) the utility model discloses constitute by base, top cap and case, structural design is compact, and occupation space is little to space utilization and part configuration when making the installation are more convenient and easy, when dropping into the wash pipe way and using, only need dispose a gas accuse flashing valve, do not need dispose the two-position two way solenoid valve in the traditional structure, the input cost is low.
(2) The valve core assembly is driven to open and close by adopting differential pressure power, so that electric energy required in the traditional structure is avoided, the safety performance is higher, and personal safety accidents cannot be caused.
(3) The pneumatic control flushing valve has high reliability, and cannot be influenced by severe environmental factors, such as sudden natural disasters and sudden power failure, so that the pneumatic control flushing valve can work normally.
(4) The maintenance is consuming time and consuming little and the expense is low, the diaphragm has broken and has directly changed the new, dismantle simple and convenient swift, need not dispose the electric wire and insert row moreover, project cost expense is few, because only one gas accuse flashing valve in every flashing pipeline, consequently can effectively avoid the problem that the assembly error appears when installing.
(5) The utility model discloses a gas accuse flashing valve does not receive the influence and the restriction of water pressure in the flashing pipeline, can use at wider height above sea level customer crowd, does not receive geographical position's influence.
Drawings
The invention will be further described with reference to the following drawings and examples:
fig. 1 is an exploded view of a pneumatic control flushing valve according to the present invention;
fig. 2 is a schematic structural view of a pneumatic control flushing valve according to the present invention;
fig. 3 is a cross-sectional view of a pneumatic control flushing valve according to the present invention;
fig. 4 is a schematic structural view of the base of the present invention;
FIG. 5 is a cross-sectional view of the base 1/2 according to the present invention;
fig. 6 is a cross-sectional view of the top cover of the present invention;
fig. 7 is a cross-sectional view of 1/4 of the lower cover body according to the present invention;
fig. 8 is a schematic structural view of the valve core assembly of the present invention;
fig. 9 is a 1/2 sectional structure diagram of the valve core assembly of the present invention.
Wherein: 1. a base;
11. the water inlet flow channel 13, the water outlet flow channel 14, the lower inner hole 15, the first cavity 16, the second cavity 17 and the slot are formed in the lower cavity;
2. a top cover;
21. the device comprises an upper cover body 22, a lower cover body 23, an upper cover body 24, a pneumatic control flow channel 25, an upper inner hole 26 and a limiting guide sheet;
3. a valve core assembly;
31. the upper valve core 32, the return spring 33, the diaphragm 34, the lower valve core 35, the lightening hole 36 and the long rod screw;
4. a side runner;
41. a first flow passage 42, a second flow passage 43, a notch;
51. a first O-shaped sealing ring, 52, a second O-shaped sealing ring, 53, a third O-shaped sealing ring, 54 and a fourth O-shaped sealing ring 54;
61. first lip seal 62, second lip seal.
Detailed Description
The following detailed description is made in conjunction with specific embodiments of the present invention:
as shown in fig. 1, 2 and 3, a pneumatic control flush valve includes a base 1 and a top cover 2 which are fixedly connected, and a valve core assembly 3 installed between the base 1 and the top cover 2, and is used for implementing opening and closing of the valve core assembly 3 driven by differential pressure power.
As shown in fig. 4 and 5, a lower cavity 11, a water inlet channel 12 and a water discharge channel 13 are arranged in the base 1, and the water inlet channel 12 and the water discharge channel are communicated with the lower cavity 11; the lower cavity 11 comprises a first cavity 15 and a second cavity 16 which are coaxially arranged from top to bottom, wherein the inner diameter of the first cavity 15 is larger than that of the second cavity 16, so that a step surface is formed at the side wall, and the step surface is provided with an annular slot 17; the water inlet channel 12 extends to the middle of the lower end face of the lower cavity 11, and the upper end face at one side of the middle of the lower cavity 11 is provided with a lower inner hole 14 which enables the water inlet channel 12 to be communicated with the lower cavity 11.
As shown in fig. 6 and 7, the top cap 2 includes an upper cap 21 and a lower cap 22 that are fixedly connected, the lower cap 22 is formed by three sections of cylinders with different outer diameters, the outer diameter of the cylinder in the middle is larger than the outer diameters of the cylinders at the upper and lower ends, an upper cavity 23, a pneumatic control flow channel 24 communicated with the upper cavity 23, and an upper inner hole 25 are provided in the lower cap 22, the upper inner hole 25 and the upper cavity 23 are coaxially provided and respectively extend to the upper and lower end faces of the lower cap 22, the lower end of the lower cap 22 is nested and fitted in the first cavity 15, so that the upper cavity 23 is communicated with the lower cavity 11, and a first O-ring seal 51 is provided between the end faces of the lower cap 22 and the upper end face of the base 1; the upper cover body 21 covers the upper end surface of the lower cover body 22, and a second O-shaped sealing ring 52 is arranged at the connected end surface.
In this embodiment, the lower cover 22 and the base 1 are fastened and fixed by fixing screws, and the upper cover 21 and the lower cover 22 are also fastened and fixed by fixing screws.
The base 1 and the top cover 2 are also internally provided with a side flow passage 4 communicated with the water inlet flow passage 12 and the upper inner hole 25; as shown in fig. 3, the side flow passage 4 includes a first flow passage 41 disposed in the base 1 and communicated with the inlet flow passage 12, a second flow passage 42 disposed in the lower cover 22 and communicated with the first flow passage 41, and a notch 43 communicating the second flow passage 42 with the upper inner hole 25, and a third O-ring seal 53 is disposed between end surfaces of a connection portion of the first flow passage 41 and the second flow passage 42; the second flow passage 42 is formed by the side wall of the lower cover 22, and the first lip-shaped sealing ring 61 is sealed at the end after the second flow passage is formed.
The valve core assembly 3 is disposed in the upper cavity 23 and the lower cavity 11, and as shown in fig. 8 and 9, includes an upper valve core 31, a diaphragm 33, a lower valve core 34, and a return spring 32 sleeved outside the upper valve core 31; wherein the upper valve core 31, the diaphragm 33 and the lower valve core 34 are coaxially arranged and fixedly connected through a long rod screw 36, and the cross section areas of the upper valve core 31 and the lower valve core 34 are the same; as shown in fig. 3, the upper end of the upper valve core 31 is nested and fitted in the upper inner hole 25, the upper end part is provided with a lightening hole 35, a second lip-shaped sealing ring 62 is arranged in the side wall of the upper inner hole 25 where the upper valve core 31 contacts with the upper inner hole 25, and the outer side wall of the upper valve core 31 in the upper cavity 23 is sleeved with a return spring 32; a limit guide sheet 26 which is enclosed into an annular structure is further arranged outside the return spring 32, and the limit guide sheet 26 is fixed on the upper end surface of the upper cavity 23; the lower end of the lower valve core 34 can extend into the lower inner hole 14 under the action of the return spring 32, and a fourth O-shaped sealing ring 54 is arranged between the side wall of the lower end part of the lower valve core 34 and the inner wall of the lower inner hole 14; the inner side end of the diaphragm 33 is fixed between the upper valve core 31 and the lower valve core 34, and the side edge which is arranged in an annular shape is bent downwards and is nested and matched in the slot 17.
As a further optimization of the present embodiment, in the present embodiment, the top cover 2, the base 1, the upper valve core 31, and the lower valve core 34 are made of plastic or plastic material manufactured by injection molding process, and usable materials include PA66, glass fiber reinforced nylon, POM, and the like, which have the characteristics of high strength, good dimensional stability, and the like.
The diaphragm 33, the first O-ring 51, the second O-ring 52, the third O-ring 53, the fourth O-ring 54, the first lip-shaped seal 61 and the second lip-shaped seal 62 mainly play a role in sealing the interfaces, and the material thereof may be nitrile rubber NBR, but is not limited to nitrile rubber NBR, and may also be a single material or a combination material having wear resistance, elasticity, oil stain resistance and weather resistance.
The return spring 32 mainly plays a role in springback, is made of spring steel or stainless steel, and needs to ensure enough elasticity during use.
The utility model discloses a concrete theory of operation as follows:
under the non-working state, the pneumatic control flow passage 24 is communicated with the atmosphere, the water pressure on the upper end face of the upper valve core 31 is realized through the water inlet flow passage 12, the side flow passage 4 and the upper inner hole 25, the water pressure on the lower end face of the lower valve core 34 is realized through the water inlet flow passage 12, the lower inner hole 14 and the second cavity 16, the cross section areas of the upper valve core 31 and the lower valve core 34 are the same, the received pressures are consistent, the total water pressure on the valve core assembly 3 is mutually offset, the closing of the valve core assembly 3 is only influenced by the elastic force of the return spring 32, the valve core assembly 3 is positioned at the lowest end through the action of the return spring 32, the lower end of the lower valve core 34 is positioned in the lower inner hole 14, the communication between the water inlet flow passage 12 and the drainage flow passage 13 is blocked through the sealing of the fourth O-shaped sealing ring 54 and the lower inner hole 14, and the pneumatic control.
Under the working stateThe pneumatic control flow passage 24 is vacuumized, and the surface area of the diaphragm 33 is set to be S1The pressure difference between the vacuum and the atmosphere on the surface of the diaphragm 33 is P1The cross-sectional area of the lower valve core 34 is SLower partThe cross-sectional area of the upper spool 31 is S2The water inlet pressure of the water inlet flow passage 12 is P2The compression force of the return spring 32 is K; to ensure that the pneumatic control flushing valve is in a water-passing state by taking the upward direction as the positive direction, the total resultant force borne by the valve core component 3 at the moment is as follows:
S1*P1+Slower part*P2＞K+SOn the upper part*P2After simplification, S1*P1＞K
Since the degree of vacuum and the surface area of the diaphragm 33 are known by priority, the range of the compression force of the return spring 32 can be calculated, and K is set to S in this embodiment to ensure reliability1*P1/1.2。
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and therefore, the present invention is considered to be exemplary and not restrictive in any way, since the scope of the present invention is defined by the appended claims, rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and therefore any reference signs in the claims are not intended to be construed as limiting the claims concerned.
Claims (6)
1. A pneumatic control flushing valve is characterized in that: comprises a base, a top cover and a valve core assembly, wherein the base and the top cover are fixedly connected; a lower cavity, a water inlet flow channel and a water drainage flow channel which are communicated with the lower cavity are arranged in the base; the water inlet flow channel extends to the middle part of the lower cavity, and the upper end surface on the same side is provided with a lower inner hole which enables the water inlet flow channel to be communicated with the lower cavity; an upper cavity, a pneumatic control flow passage communicated with the upper cavity and an upper inner hole are arranged in the top cover; the base and the top cover are internally provided with a side flow passage communicated with the water inlet flow passage and the upper inner hole; the valve core assembly is arranged in the upper cavity and the lower cavity and comprises an upper valve core, a diaphragm, a lower valve core and a return spring, wherein the upper valve core, the diaphragm and the lower valve core are coaxially arranged, and the return spring is sleeved on the outer side of the upper valve core.
2. A pneumatically controlled flush valve according to claim 1, characterized in that: the cavity is including first cavity and the second cavity of from top to bottom coaxial setting down, first cavity internal diameter is greater than the second cavity internal diameter to lateral wall department forms the step face, have a slot that is the annular setting on the step face.
3. A pneumatically controlled flush valve according to claim 2, wherein: the top cover comprises an upper cover body and a lower cover body which are fixedly connected, the upper cavity, the pneumatic control flow channel and the upper inner hole are all arranged in the lower cover body, the upper inner hole and the upper cavity are coaxially arranged and respectively extend to the upper end face and the lower end face of the lower cover body, the lower end of the lower cover body is nested and matched in the first cavity, and a first O-shaped sealing ring is arranged between the lower cover body and the end face, which is in contact with the upper end face of the base; the upper cover body is covered on the upper end face of the lower cover body, and a second O-shaped sealing ring is arranged on the connected end face.
4. A pneumatically controlled flush valve according to claim 3, wherein: the side runner comprises a first runner, a second runner and a notch, the first runner is arranged in the base and communicated with the water inlet runner, the second runner is arranged in the lower cover and communicated with the first runner, the notch is communicated with the second runner and the upper inner hole, and a third O-shaped sealing ring is arranged between the end faces of the joint of the first runner and the second runner; the second flow passage is formed by the side wall of the lower cover body, and a first lip-shaped sealing ring is plugged at the end part of the second flow passage.
5. A pneumatically controlled flush valve according to claim 3, wherein: the upper valve core, the diaphragm and the lower valve core are coaxially arranged and fixedly connected in a penetrating way through a long rod screw, the upper end of the upper valve core is nested and matched in the upper inner hole, a second lip-shaped sealing ring is arranged in the side wall of the upper inner hole which is in contact with the upper inner hole, and a reset spring is sleeved on the outer side wall of the upper valve core in the upper cavity; the lower end of the lower valve core can extend into the lower inner hole under the action of a return spring, and a fourth O-shaped sealing ring is arranged between the side wall of the lower end part of the lower valve core and the inner wall of the lower inner hole; the inner side end of the diaphragm is fixed between the upper valve core and the lower valve core, and the side edge which is arranged in an annular shape is bent downwards and is embedded and matched in the slot.
6. An air-operated flush valve according to claim 5, wherein: the cross section areas of the upper valve core and the lower valve core in the horizontal direction are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021293467.7U CN212318814U (en) | 2020-07-03 | 2020-07-03 | Pneumatic control flushing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021293467.7U CN212318814U (en) | 2020-07-03 | 2020-07-03 | Pneumatic control flushing valve |
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| Publication Number | Publication Date |
|---|---|
| CN212318814U true CN212318814U (en) | 2021-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021293467.7U Active CN212318814U (en) | 2020-07-03 | 2020-07-03 | Pneumatic control flushing valve |
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| Country | Link |
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| CN (1) | CN212318814U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111706684A (en) * | 2020-07-03 | 2020-09-25 | 清环拓达(苏州)环境科技有限公司 | Pneumatic control flushing valve |
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2020
- 2020-07-03 CN CN202021293467.7U patent/CN212318814U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111706684A (en) * | 2020-07-03 | 2020-09-25 | 清环拓达(苏州)环境科技有限公司 | Pneumatic control flushing valve |
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