CN118049491A - Double-stop valve backflow preventer with backflow prevention and water drainage functions - Google Patents
Double-stop valve backflow preventer with backflow prevention and water drainage functions Download PDFInfo
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- CN118049491A CN118049491A CN202410371378.6A CN202410371378A CN118049491A CN 118049491 A CN118049491 A CN 118049491A CN 202410371378 A CN202410371378 A CN 202410371378A CN 118049491 A CN118049491 A CN 118049491A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 246
- 230000002265 prevention Effects 0.000 title claims abstract description 57
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 76
- 238000007789 sealing Methods 0.000 claims abstract description 38
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 238000004891 communication Methods 0.000 claims abstract description 6
- 238000013022 venting Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
Each stop valve is externally connected with the same backflow prevention control reversing valve through a downstream control channel of a valve cover, and the backflow prevention control reversing valve is respectively connected with a liquid inlet arc-shaped chamber of an upstream stop valve and a liquid outlet arc-shaped chamber of a downstream stop valve through different control channels; the liquid inlet arc chamber of each stop valve is externally connected with the same water drain valve. The valve core of the reversing valve is pushed to the lower sealing port so that the system is normally opened and closed, and the valve core of the reversing valve is pushed to the upper sealing port to block the communication between the control channel of the downstream section and the emptying channel, so that the backflow prevention stop valve system has a backflow prevention function; when the downstream stop valve is not tightly sealed and closed, the valve core of the water discharge valve moves towards the upstream control cavity of the water discharge valve, the water discharge valve is opened, and if the pressure value of the pressure water in the middle cavity is lower than the pressure value of the upstream port of the water supply and higher than the pressure preset value of the middle cavity, the valve core of the water discharge valve moves towards the direction of the control cavity of the middle cavity of the water discharge valve, and the water discharge sealing of the water discharge valve is closed.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a backflow preventer with a backflow prevention and water drainage function for double stop valves.
Background
The structure of the backflow preventer comprises a stop valve, and the designed hydraulic control combination device which strictly limits water in the pipeline to flow only in one direction is used for preventing medium in the pipeline from flowing backwards under the conditions that the backflow pollution of the living drinking water pipeline is serious and no backflow pollution preventing device is available. At present, the method can be widely applied to urban water supply networks, can be used for cut-off control of fluid in the network, and can also avoid backflow pollution so as to ensure normal operation of the water supply systems.
However, at present, a backflow preventer consisting of a water drain valve, a reversing valve and a double stop valve applied to an urban water supply network does not appear, and the invention provides the double stop valve backflow preventer with a backflow prevention water drain function in combination with practical application requirements.
Disclosure of Invention
The invention provides a double-stop valve backflow preventer with backflow prevention and water discharge functions, aiming at the defects, and the backflow prevention and water discharge functions of a system are realized by utilizing the corresponding control channels in the upstream stop valve and the downstream stop valve and combining a reversing valve with a pressure emptying channel and a water discharge valve.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a take two stop valves backflow preventer of backflow prevention sluicing function, it adopts upstream and downstream stop valve assembly between water supply upstream port and water supply downstream port, wherein, water supply upstream port is linked together with the feed liquor arc cavity of upstream stop valve, and the feed liquor downstream port is linked together with the play liquid arc cavity of downstream stop valve, and the valve rod of every stop valve is equipped with the valve clack that is used for opening and close the valve body and the valve clack sets up in play liquid arc cavity to carry out the shutoff to the intercommunicating pore between the feed liquor arc cavity of place stop valve and the play liquid arc cavity, concrete technique includes:
A valve clack downstream control channel is arranged in each valve clack of the stop valve, a control channel is arranged in the valve rod, the valve rod downstream control channel comprises a valve rod upstream control channel and a valve rod downstream control channel which are vertically arranged, the valve rod downstream control channel is connected with the downstream control channel which is transversely arranged in the valve cover, and the valve cover downstream control channel and the valve rod downstream control channel are communicated with a plurality of overflow holes of the valve rod sealing support sleeve;
Each stop valve is externally connected with the same backflow prevention control reversing valve through a downstream control channel of the valve cover, and the backflow prevention control reversing valve is respectively connected with a liquid inlet arc-shaped chamber of an upstream stop valve and a liquid outlet arc-shaped chamber of a downstream stop valve through different control channels;
the liquid inlet arc chamber of each stop valve is externally connected with the same water drain valve, the liquid outlet arc chamber of the upstream stop valve and the liquid inlet arc chamber of the downstream stop valve form an intermediate chamber, and the water drain control chamber of the water drain valve is connected to the intermediate chamber through an intermediate chamber control water drain channel;
For the dual shut-off valve backflow preventer, it can form different running states through the cooperation of dual shut-off valve, switching-over valve and water escape valve, include:
When the pressurized water in the control channel of the upstream section is positioned at the upper opening position of the backflow prevention control reversing valve, the valve core of the reversing valve is pushed to be sealed downwards to block the control channel of the downstream section from conveying the pressurized water to the control channel of the downstream valve cover, so that the backflow preventer of the double stop valve forms a normal opening and closing state;
When the pressure water of the control channel of the downstream section flows to the position of the lower port of the backflow prevention control reversing valve, the valve core of the reversing valve pushes the upper sealing port to block the communication between the control channel of the downstream section and the emptying channel, so that the backflow preventer of the double stop valve forms a backflow prevention state, the upper stop valve and the downstream stop valve are sealed and closed, the pressure of the downstream port of water supply is high and the pressure water cannot flow back to the middle cavity, and the water drain valve is closed;
When the downstream stop valve is not tightly sealed and closed, the valve core of the water drain valve moves towards the upstream control cavity of the water drain valve, the water drain valve is opened, the pressure water in the middle cavity sequentially flows to the water drain control channel of the middle cavity of the water drain valve, the pressure water in the middle cavity is released and discharged through the valve core of the water drain valve and the water drain channel of the middle cavity, and if the pressure value of the pressure water in the middle cavity is lower than the upstream port of water supply and higher than the preset pressure value of the middle cavity, the valve core of the water drain valve moves towards the direction of the control cavity of the water drain valve, and the water drain sealing of the water drain valve is closed.
Further, if the downstream stop valve is not tightly sealed and closed, when the pressure of the middle cavity is increased to be higher than the pressure preset value of the pressure water of the middle cavity than the pressure of the upstream port of the water supply, the pressure of the pressure water of the middle cavity is controlled by the middle cavity, the middle cavity water discharge control channel and the water discharge valve, the pressure of the pressure water of the middle cavity is overcome, the pressure water from the upstream port of the water supply, the upstream water discharge control channel and the upstream water discharge valve control channel, the water discharge valve core of the water discharge valve moves towards the upstream water discharge valve control cavity, the water discharge valve is opened, and the pressure water of the middle cavity is sequentially discharged to the middle cavity water discharge control channel and the middle cavity water discharge control channel through the water discharge valve core and the middle cavity water discharge channel.
The operation of each shut-off valve is different for different conditions, including:
under the normal open-close state, the valve cover downstream control channel of each stop valve is communicated with the emptying channel, no pressure water exists in the valve cover downstream control channel, the valve rod downstream control channel and the valve clack downstream control channel, and the valve rod upstream control channel is provided with pressure water, so that the pressure water is pressed towards the valve rod pin.
Under the state of backflow prevention, the valve cover downstream control channel of each stop valve transmits pressurized water, high-pressure water sequentially flows to the valve rod downstream control channel and the valve clack downstream control channel to reach the tail end face of the valve clack pin, the valve rod upstream control channel does not have pressurized water, the high-pressure water pushes the valve clack pin to avoid locking of the valve clack and the valve rod, the valve clack falls down, and the sealing port of the stop valve is closed freely.
The technical means which can be implemented also comprise:
For the valve stem, there may be upper and lower sealing sleeves.
For the reversing valve, a passage for venting the pressure may be provided.
The drain valve may be provided with an intermediate chamber drain passage for pressure relief and drainage.
For the valve rod, an enclosed space is formed by the upper sealing sleeve, the lower sealing sleeve and the valve rod sealing support sleeve.
The invention utilizes the corresponding control channel designed in the upstream and downstream double stop valves and combines the reversing valve and the water drain valve, the system is normally opened and closed by pushing the valve core of the reversing valve to the lower sealing port, and the communication between the downstream control channel and the emptying channel is blocked by pushing the valve core of the reversing valve to the upper sealing port, so that the backflow prevention stop valve system has backflow prevention function; and meanwhile, when the downstream stop valve is not tightly sealed and closed, the valve core of the water discharge valve moves towards the direction of the upstream control cavity of the water discharge valve, the water discharge valve is opened, and if the pressure value of the pressure water in the middle cavity is lower than the pressure value of the upstream port of the water supply and higher than the pressure preset value of the middle cavity, the valve core of the water discharge valve moves towards the direction of the control cavity of the middle cavity of the water discharge valve, and the water discharge sealing of the water discharge valve is closed.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a dual shutoff valve backflow preventer with backflow prevention and draining functions, which is implemented by the present invention, in a normally closed state of the valve;
FIG. 2 is a schematic diagram of a dual shutoff valve backflow preventer with backflow prevention and draining functions, which is implemented by the present invention, in a normally open state;
FIG. 3 is a schematic diagram of a dual shutoff valve backflow preventer with backflow prevention function, according to the present invention, in which the valve is in a state of being activated when a backflow occurs during opening;
FIG. 4 is a schematic diagram of a dual shutoff valve backflow preventer with backflow prevention function, according to the present invention, wherein the valve is in a closed state of a valve flap of a backflow prevention system when a backflow occurs during opening;
FIG. 5 is a schematic diagram of a dual shutoff valve backflow preventer with backflow prevention function, with the valve in an open draining state of a backflow prevention system drain valve with an elevated intermediate chamber pressure;
FIG. 6 is a schematic diagram of a reverse flow preventing control reversing valve of the double stop valve reverse flow preventer with a reverse flow preventing water draining function according to the present invention;
Fig. 7 is a schematic view of a valve stem, a valve flap, and a valve cover of each of the check valves of the double check valve backflow preventer with backflow prevention function according to the present invention.
In the figure:
1. A water supply upstream port;
2. a downstream port for water;
3. a stop valve with a backflow preventing device;
4. a valve cover;
5. a valve stem;
6. a valve flap;
7. A valve body;
8. A valve clack return spring;
9. A valve clack pin;
10. A valve rod pin;
11. A valve stem return spring;
12. A control channel downstream of the valve flap;
13. a valve stem upstream control passage;
14. an upstream control channel;
15. a lower sealing sleeve of the valve rod;
16. A valve rod sealing support sleeve;
17. sealing sleeve on valve rod;
18. a control passage downstream of the valve cover;
19. a valve stem downstream control passage;
20. a reverse flow preventing control reversing valve;
21. a reversing reset spring;
22. A reversing valve core;
23. a vent passage;
24. a downstream control channel;
25. An intermediate chamber;
26. a water drain valve;
27. an upstream control drain passage;
28. An upstream control chamber of the drain valve;
29. A valve core of the water drain valve;
30. A water drain valve tripping spring;
31. the middle cavity controls a water discharge channel;
32. A water discharge control chamber;
33. And a middle cavity water draining channel.
Detailed Description
The invention relates to a double-stop valve backflow preventer with backflow prevention water draining function, which adopts an assembly mode of double-stop valves, namely, an upper stop valve 3 and a lower stop valve 3 with backflow prevention devices are sequentially assembled between an upstream water supply port 1 and a downstream water supply port 2, a backflow prevention control reversing valve 20 is simultaneously assembled outside the two stop valves, and a water draining valve 26 is commonly connected with an arc-shaped liquid inlet chamber of each stop valve in an external mode, so that the whole technical scheme is implemented to form the backflow preventer.
As shown in fig. 1-2 and fig. 6-7, in the embodiment of the backflow prevention stop valve system of the present invention, each stop valve 3 with backflow prevention means is provided with a valve rod 5 capable of sliding up and down, the upper part of the valve rod 5 is provided with a valve cover 4, and the valve rod 5 is sleeved with a valve clack 6 for opening and closing a valve body 7; because the water supply upstream port 1 is communicated with the liquid inlet arc chamber of the valve body 7 of the upstream stop valve, the liquid outlet arc chamber of the upstream stop valve is connected with the liquid inlet arc chamber of the downstream stop valve and forms an intermediate chamber 25 opposite to the double stop valve, and the water supply downstream port 2 is communicated with the liquid outlet arc chamber of the valve body 7 of the downstream stop valve, as the valve clack 6 of each stop valve is arranged in the respective liquid outlet arc chamber, when the water supply downstream port is in specific work, the communication hole between the liquid inlet arc chamber and the liquid outlet arc chamber of the stop valve can be plugged.
Correspondingly, the flap 6 and the valve rod 5 are each provided with a flap pin 9 and a valve rod pin 10, which are adjacent to each other, and are each connected to a flap return spring 8 and a valve rod return spring 11.
For each stop valve of upstream and downstream, its valve clack 6, valve rod 5, valve gap 4, respectively inside all offer corresponding control channel, specifically include:
The valve clack 6 is internally provided with a valve clack downstream control channel 12, the valve cover 4 is internally provided with a transverse valve cover downstream control channel 18, the valve rod 5 is internally provided with a vertical control channel, the vertical control channel comprises a valve rod upstream control channel 13 and a valve rod downstream control channel 19, and the valve rod downstream control channel 19 is connected with the valve cover downstream control channel 18.
The upper part of the sliding chamber where the implemented valve rod 5 is arranged is added with a corresponding sealing structure, and the sealing structure comprises a valve rod sealing support sleeve 16, and a valve rod upper sealing sleeve 17 and a valve rod lower sealing sleeve 15 which are respectively arranged on the upper side and the lower side of the support sleeve, wherein the valve rod sealing support sleeve 16 is provided with a plurality of overflow holes, and the valve rod sealing support sleeve is respectively communicated with a valve cover downstream control channel 18 and a valve rod downstream control channel 19 through the holes.
Further, the downstream control channels 18 of the valve covers of the two stop valves are respectively connected with the same backflow prevention control reversing valve 20 through external channels, the backflow prevention control reversing valve 20 is connected with the liquid inlet arc-shaped chamber of the upstream stop valve through the upstream control channel 14, meanwhile, the backflow prevention control reversing valve 20 is connected with the liquid outlet arc-shaped chamber of the downstream stop valve through the downstream control channel 24, the assembled backflow prevention control reversing valve 20 is positioned between the upstream control channel 14 and the downstream control channel 24, the reversing valve core 22 of the assembled backflow prevention control reversing valve 20 is connected with a reversing reset spring 21, and the reversing valve core 22 is further provided with a venting channel 23 for venting pressure.
Further, the outside of the double stop valve formed by the above is connected with a water drain valve 26 with a middle cavity water drain channel 33, wherein the liquid inlet arc chamber of the upstream stop valve is connected to one end of the water drain valve 26 where the water drain valve upstream control cavity 28 is located through the upstream control water drain channel 27, one end of the water drain valve 26 where the water drain control cavity 32 is located is connected to the middle cavity 25 through the middle cavity control water drain channel 31, the water drain valve core 29 of the assembled water drain valve 26 is connected with a water drain valve jump spring 30, and the water drain valve 26 is further provided with the middle cavity water drain channel 33 for pressure relief and emptying.
As shown in fig. 1-2, in the double shut-off valve backflow preventer with backflow prevention water discharging function to be implemented in the present invention, in normal closed and opened states, since the pressure of the water supply upstream port 1 is high and the pressure of the water supply downstream port 2 is low, after water enters the valve body 7 from the city water supply upstream port 1, the pressurized water of the upstream control channel 14 is at the upper opening position of the backflow prevention control reversing valve 20, the reversing valve core 22 is pushed down to be sealed by the pressurized water, and for each shut-off valve, the downstream control channel 24 is blocked from delivering the pressurized water to the valve cover downstream control channel 18; because the downstream control channel 18 of the valve cover is communicated with the emptying channel 23, no pressure water exists in the downstream control channel 18 of the valve cover, the downstream control channel 19 of the valve rod and the downstream control channel 12 of the valve clack, and the upstream control channel 13 of the valve rod is provided with pressure water, so that the pressure water is pressed to the valve rod pin 10, the force of the valve rod return spring 11 and the valve clack return spring 8 is overcome, the valve clack pin 9 is pushed, the front section of the valve rod pin 10 is embedded into the shaft hole of the valve clack pin 9, the valve rod 5 locks the valve clack 6, drives the valve clack 6 to move up and down, and the normal closing and opening states of the valve are ensured, as shown in fig. 1, and the normal opening states of the valve are shown in fig. 2.
As shown in fig. 3 to 5, in the dual shutoff valve backflow preventer with backflow prevention and water drainage function of the present invention, when pollution backflow occurs, since the pressure of the water supply downstream port 2 is high and the pressure of the water supply upstream port 1 is low, after water enters the valve body 7 from the urban water supply downstream port 2, the pressurized water of the downstream control channel 24 flows to the lower opening position of the backflow prevention control reversing valve 20, the reversing valve core 22 is pushed to the upper sealing opening by the pressurized water, and for each shutoff valve, the communication between the downstream control channel 24 and the emptying channel 23 is blocked, and the pressurized water is delivered to the valve cover downstream control channel 18; meanwhile, the valve rod 5 is kept to move up and down through a closed space formed by combining the valve rod upper sealing sleeve 17, the valve rod sealing support sleeve 16 with a plurality of flow holes and the valve rod lower sealing sleeve 15, and high-pressure water flows to the valve rod downstream control channel 19 and the valve clack downstream control channel 12 to reach the tail end face of the valve clack pin 9; the control channel 13 on the upstream of the valve rod is free of pressurized water, the high-pressure water pushes the valve clack pin 9, and then pushes the valve rod pin 10 to withdraw from the valve clack pin 9 running shaft hole of the valve clack 6, so that the valve clack 6 is prevented from locking with the valve rod 5, and the valve clack 6 falls under the action of dead weight and backflow water pressure, the sealing port of the stop valve is freely closed, the backflow preventing function is achieved, the valve shown in fig. 3 is in a backflow preventing system starting state when the backflow occurs in the opening process, and the valve shown in fig. 4 is in a valve clack closing state of the backflow preventing system when the backflow occurs in the opening process. At this time, the upstream and downstream shutoff valves are tightly sealed, the pressure of the water supply downstream port 2 is high, the pressurized water cannot flow back to the intermediate chamber 25, and the drain valve 26 is closed.
However, when the downstream cut-off valve is not tightly sealed, because the pressure of the water supply downstream port 2 is high, the pressure water flows back into the middle cavity 25, when the pressure of the middle cavity 25 is raised to be higher than the pressure of the water supply upstream port 1 by a preset value than the pressure of the middle cavity 25 (pressure water), the pressure of the pressure water in the middle cavity 32 is overcome by the pressure of the middle cavity 25, the middle cavity water discharge control channel 31 and the water discharge valve middle cavity control channel 31, the pressure of the pressure water in the water supply upstream port 1, the upstream water discharge control channel 7 and the water discharge valve upstream control channel 8, the water discharge valve core 29 of the water discharge valve 26 moves towards the water discharge valve upstream control channel 8, the water discharge valve 26 is opened, and the pressure water in the middle cavity 25 is discharged to the middle cavity water discharge control channel 31 and the water discharge valve middle cavity 32 through the water discharge valve core 29 and the middle cavity water discharge channel 33 in sequence; when the pressure value of the pressure water in the middle cavity 25 is lower than the pressure of the upstream port 1 (pressure water) of the water supply and higher than the preset pressure value of the middle cavity 25 (pressure water), the pressure of the pressure water in the upstream control cavity 8 of the water discharge valve from the upstream port 1 (pressure water) of the water supply, the upstream water discharge control channel 27, the pressure water in the middle cavity 25, the middle cavity water discharge control channel 31 and the pressure water in the middle cavity control cavity 32 of the water discharge valve is higher than the mixing force of the combined water discharge valve jump spring 30, the water discharge valve core 29 of the water discharge valve 26 moves towards the direction of the middle cavity control cavity 32 of the water discharge valve, and the water discharge sealing of the water discharge valve 26 is closed.
Finally, when the water supply upstream port 1 (high pressure) is supplied, the valve clack 6 of the stop valve is driven to be opened by the pressure of the pressure water until the front section of the valve rod pin 10 of the valve rod 5 is embedded into the shaft hole of the valve clack pin 9; the water at the water supply upstream port 1 (high pressure) is supplied to the water supply downstream port 2 (low pressure) via the shut-off valve backflow preventer, and the city water supply is continued.
In the description of the present specification, the terms "present embodiment," "detailed description," and the like, if any, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention or invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples; furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments described above are intended to facilitate understanding and application by those skilled in the art, and it will be apparent to those skilled in the art that various modifications may be made to these examples and that the general principles described herein may be applied to other embodiments without undue burden.
Claims (10)
1. The utility model provides a take two stop valves backflow preventer of backflow prevention sluicing function, its adopts upstream and downstream stop valve assembly between water supply upstream port and water supply downstream port, wherein, water supply upstream port is linked together with the feed liquor arc cavity of upstream stop valve, and the feed liquor downstream port is linked together with the play liquid arc cavity of downstream stop valve, and the valve rod of every stop valve is equipped with the valve clack that is used for opening and close the valve body and the valve clack sets up in play liquid arc cavity to carry out shutoff to the intercommunicating pore between the feed liquor arc cavity of place stop valve and the play liquid arc cavity, its characterized in that:
A valve clack downstream control channel is arranged in each valve clack of the stop valve, the valve rod comprises a valve rod upstream control channel and a valve rod downstream control channel which are vertically arranged, the valve rod downstream control channel is connected with a downstream control channel which is transversely arranged in the valve cover, and the valve cover downstream control channel and the valve rod downstream control channel are both communicated with a plurality of overflow holes of the valve rod sealing support sleeve;
Each stop valve is externally connected with the same backflow prevention control reversing valve through a downstream control channel of the valve cover, and the backflow prevention control reversing valve is respectively connected with a liquid inlet arc-shaped chamber of an upstream stop valve and a liquid outlet arc-shaped chamber of a downstream stop valve through different control channels;
The liquid inlet arc-shaped chamber of each stop valve is externally connected with the same water drain valve, the liquid outlet arc-shaped chamber of the upstream stop valve and the liquid inlet arc-shaped chamber of the downstream stop valve form an intermediate chamber, and the water drain control chamber of the water drain valve is connected to the intermediate chamber through an intermediate chamber control water drain channel;
The double-stop valve backflow preventer is formed into different running states by the cooperation of a double-stop valve, a reversing valve and a water drain valve, and comprises:
When the pressurized water in the control channel of the upstream section is positioned at the upper opening position of the reverse flow control reversing valve, the valve core of the reversing valve pushes the lower sealing opening to block the control channel of the downstream section from conveying the pressurized water to the control channel of the downstream section of the valve cover, so that the double stop valve reverse flow preventer forms a normal opening and closing state;
When the pressure water of the control channel of the downstream section flows to the position of the lower opening of the reverse flow prevention control reversing valve, the valve core of the reversing valve is pushed to the upper sealing opening to block the communication between the control channel of the downstream section and the emptying channel, so that the reverse flow prevention device of the double stop valve forms a reverse flow prevention state, the upper and downstream stop valves are sealed and closed, the pressure of the downstream port of water supply is high and can not flow the pressure water back to the middle cavity, and the water drain valve is closed;
When the downstream stop valve is not tightly sealed and closed, the valve core of the water discharge valve moves towards the upstream control cavity of the water discharge valve, the water discharge valve is opened, the pressure water in the middle cavity sequentially flows to the water discharge control channel of the middle cavity and the water discharge control cavity of the water discharge valve, the pressure water is discharged through the valve core of the water discharge valve and the water discharge channel of the middle cavity, and if the pressure value of the pressure water in the middle cavity is lower than the upstream port of water supply and higher than the preset pressure value of the middle cavity, the valve core of the water discharge valve moves towards the direction of the control cavity of the water discharge valve, and the water discharge seal of the water discharge valve is closed.
2. The double shut-off valve backflow preventer with backflow prevention function according to claim 1, wherein: if the downstream stop valve is not tightly sealed, when the pressure of the middle cavity is increased to be higher than the pressure preset value of the pressure water of the middle cavity than the pressure of the upstream port of the water supply, the pressure of the pressure water of the middle cavity is controlled by the middle cavity, the middle cavity water discharge control channel and the water discharge valve, the pressure of the pressure water of the middle cavity is overcome, the pressure of the pressure water from the upstream port of the water supply, the upstream water discharge control channel and the upstream water discharge control channel of the water discharge valve is overcome, the water discharge valve core of the water discharge valve moves towards the upstream control cavity of the water discharge valve, the water discharge valve is opened, and the pressure water of the middle cavity is sequentially discharged to the middle cavity water discharge control channel and the middle cavity water discharge control channel of the water discharge valve through the water discharge valve core and the middle cavity water discharge channel.
3. The double shut-off valve backflow preventer with backflow prevention function according to claim 1, wherein: under the normal open-close state, the valve cover downstream control channel of each stop valve is communicated with the emptying channel, no pressure water exists in the valve cover downstream control channel, the valve rod downstream control channel and the valve clack downstream control channel, and the valve rod upstream control channel is provided with pressure water, so that the pressure water is pressed towards the valve rod pin.
4. The double shut-off valve backflow preventer with backflow prevention function according to claim 1, wherein: under the state of backflow prevention, the valve cover downstream control channel of each stop valve transmits pressurized water, high-pressure water sequentially flows to the valve rod downstream control channel and the valve clack downstream control channel to reach the tail end face of the valve clack pin, the valve rod upstream control channel does not have pressurized water, the high-pressure water pushes the valve clack pin to avoid locking of the valve clack and the valve rod, the valve clack falls down, and the sealing port of the stop valve is closed freely.
5. The double shut-off valve backflow preventer with backflow prevention function according to claim 3, wherein: the front section of the valve rod pin is embedded into the shaft hole of the valve clack pin, so that the valve rod locks the valve clack to drive the valve clack to move up and down.
6. The double shut-off valve backflow preventer with backflow prevention function according to claim 4, wherein: the valve rod pin exits from the valve clack pin running shaft hole of the valve clack, so that the valve clack is prevented from being locked with the valve rod, and the valve clack falls down.
7. The double shut-off valve backflow preventer with backflow prevention function according to any one of claims 1 to 6, wherein: the valve rod is provided with an upper sealing sleeve and a lower sealing sleeve.
8. The double shut-off valve backflow preventer with backflow prevention function according to any one of claims 1 to 6, wherein: the reversing valve is provided with a passage for venting the pressure.
9. The double shut-off valve backflow preventer with backflow prevention function according to any one of claims 1 to 6, wherein: the water drain valve is provided with a middle cavity water drain channel for pressure relief and emptying.
10. The double shut-off valve backflow preventer with backflow prevention function according to claim 7, wherein: the upper and lower sealing sleeves of the valve rod and the valve rod sealing support sleeve form a closed space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410371378.6A CN118049491A (en) | 2024-03-29 | 2024-03-29 | Double-stop valve backflow preventer with backflow prevention and water drainage functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410371378.6A CN118049491A (en) | 2024-03-29 | 2024-03-29 | Double-stop valve backflow preventer with backflow prevention and water drainage functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118049491A true CN118049491A (en) | 2024-05-17 |
Family
ID=91050490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410371378.6A Pending CN118049491A (en) | 2024-03-29 | 2024-03-29 | Double-stop valve backflow preventer with backflow prevention and water drainage functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118049491A (en) |
-
2024
- 2024-03-29 CN CN202410371378.6A patent/CN118049491A/en active Pending
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