Butterfly valve with downstream pipe burst emergency shutoff function

Abstract

The utility model provides a butterfly valve with a downstream pipe burst emergency shutoff function, which comprises an urban water supply upstream end, an urban water supply downstream end and a butterfly plate, two ends of the butterfly plate are respectively connected with an upper valve rod and a lower valve rod, and the lower valve rod is connected with a butterfly valve body through a torsion spring; a main control channel is formed in the upper valve rod, and a connecting pin is arranged at the bottom end of the main control channel and enables the upper valve rod to be connected with or separated from the butterfly plate. One end of the downstream control channel is communicated with the main control channel through a pressure relief pilot valve, the other end of the downstream control channel is communicated with the urban water supply downstream end, and when the pressure of the urban water supply downstream end is reduced to be below a threshold value, the main control channel can eliminate the internal positive pressure through a pressure discharge opening of the pressure relief pilot valve, and the pin is separated from the butterfly plate. According to the utility model, the pressure relief pilot valve is matched with the downstream control channel, so that the pressure in the main control channel can be changed in time when the downstream pipe bursts to cause the change of water pressure, the separation of the butterfly plate and the upper valve rod is completed, and the butterfly plate is reset and blocked under the action of the torsion spring to avoid the continuous leakage of water resources.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, in particular to a butterfly valve with a downstream pipe burst emergency shut-off function. Background Art

[0002] In urban water supply systems, butterfly valves are a key component. They regulate the flow of media within pipelines by adjusting their degree of opening. Therefore, they are primarily used to control the flow of media within large-diameter pipelines, ensuring safe and stable system operation. In areas such as high-rise buildings, industrial production, and urban water supply, the accelerated pace of urbanization and growing water supply demand are placing higher demands on the performance, reliability, and intelligence of butterfly valves.

[0003] In the existing butterfly valve application process, when encountering a large amount of water discharge due to emergency leakage downstream, the butterfly valve located upstream cannot detect the leakage in time and therefore cannot be closed in time. Continuing water supply is likely to cause a large amount of water waste. Therefore, how to shut off the butterfly valve in time in the face of emergency leakage downstream is also an urgent problem to be solved. Utility Model Content

[0004] In view of this, the present invention aims to provide a butterfly valve with a downstream pipe burst emergency shut-off function, so that the valve body can be closed in time when an emergency leak occurs in the downstream.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A butterfly valve with downstream pipe burst emergency shut-off function, comprising

[0007] The butterfly valve body includes an upstream end for city water supply, a downstream end for city water supply, and a butterfly plate. The two ends of the butterfly plate are respectively connected to the upper valve stem and the lower valve stem. A torsion spring is connected between the lower valve stem and the butterfly valve body so that the torsion spring can be elastically deformed when the lower valve stem rotates.

[0008] A main control channel is formed in the upper valve stem, and a connecting pin is radially provided at the bottom end of the main control channel. When positive pressure is formed in the main control channel, the pin extends outward and inserts into the butterfly plate, so that the valve stem can drive the butterfly plate to rotate;

[0009] The downstream control channel is connected to the main control channel at one end and to the downstream end of the city water supply at the other end. A pressure relief pilot valve is connected in series on the downstream control channel. When the pressure at the downstream end of the city water supply decreases below the threshold, the main control channel can be connected to the pressure relief pilot valve's discharge port. At this time, the pin is separated from the butterfly plate.

[0010] Furthermore, a lower valve cover is fixedly provided at the bottom of the butterfly valve body, one end of the torsion arm of the torsion spring is inserted into the lower valve cover, and the other end of the torsion arm is inserted into the lower valve stem.

[0011] Furthermore, the pressure relief pilot valve is connected to the main control channel through a burst pipe emergency shut-off control channel. The pressure relief pilot valve is provided with a reversing valve core and a pilot valve return spring that can move along the length direction of the pressure relief pilot valve. The pilot valve return spring presses against the end of the reversing valve core, and when the water pressure at the downstream end of the city water supply is lower than the threshold, the pilot valve return spring can squeeze the reversing valve core downward so that the reversing valve core blocks the pipe outlet of the downstream control channel.

[0012] Furthermore, an upper valve stem burst pipe emergency shutdown control channel is opened along the outer wall of the upper valve stem, which is connected to the main control channel through a through hole, and the upper valve stem burst pipe emergency shutdown control channel is arc-shaped. The burst pipe emergency shutdown control channel can be connected to the main control channel through the upper valve stem burst pipe emergency shutdown control channel.

[0013] Furthermore, a receiving hole is opened at the top of the butterfly plate, and a pin reset spring is built into the receiving hole. The end of the connecting pin rests on the pin reset spring, and the connecting pin can be inserted into the receiving hole.

[0014] Furthermore, the butterfly valve also includes an upstream control channel, one end of which is connected to the upstream end of the city water supply, and the other end of which is connected to the main control channel.

[0015] Furthermore, an upper valve stem upstream control channel is opened along the circumference of the main control channel, and the upper valve stem upstream control channel is connected with the main control channel through a through hole.

[0016] Furthermore, the angles corresponding to the arcs of the upper valve stem upstream control channel and the upper valve stem pipe burst emergency shutdown control channel are both less than 90°, and when the butterfly valve is opened to the extreme position, the upper valve stem upstream control channel is disconnected from the upstream control channel.

[0017] Compared with the prior art, the butterfly valve with downstream pipe burst emergency shut-off function described in the present invention has the following advantages:

[0018] The utility model adopts a pressure relief pilot valve in conjunction with the downstream control channel, so that when a pipe burst occurs downstream and the water pressure changes, the state of the pressure relief pilot valve can be changed in time, thereby reducing the pressure in the main control channel, and then completing the separation of the butterfly plate and the upper valve stem. The butterfly plate completes the blocking of the butterfly valve body under the action of the torsion spring, thereby preventing continuous leakage of water resources;

[0019] The upstream control channel is connected to the main control channel to apply positive pressure in the main control channel, so that after the emergency situation such as downstream pipe burst is handled, the positive pressure in the main control channel can be recharged by controlling the rotation of the upper valve stem, so that the butterfly valve can be reused;

[0020] The upper valve stem upstream control channel and the upper valve stem pipe burst emergency shutdown control channel are coordinated to prevent the water medium in the upstream from directly connecting with the pressure discharge port of the pressure relief pilot valve through the upstream control channel and being discharged when a pipe burst occurs downstream, thereby preventing water resources from being wasted. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of the butterfly valve;

[0023] Figure 2 This is a schematic diagram of the structure of the pressure relief pilot valve communicating with each channel;

[0024] Figure 3 Schematic diagram of the connection structure between the butterfly plate and the upper valve stem;

[0025] Figure 4 Schematic diagram of the connection status between the main control channel and the upstream control channel;

[0026] Figure 5 Schematic diagram of the disconnection status of the main control channel and the burst pipe emergency shutdown control channel.

[0027] Description of reference numerals:

[0028] 1-butterfly valve body; 2-upstream end of urban water supply; 3-downstream end of urban water supply; 4-butterfly plate; 5-accommodating hole; 6-pin return spring; 7-connecting pin; 8-upper valve stem; 9-upper valve stem upstream control channel; 10-upper valve stem pipe burst emergency shutdown control channel; 11-main control channel; 12-pipe burst emergency shutdown control channel; 13-downstream control channel; 14-sealing sleeve; 15-lower valve stem; 16-torsion spring; 17-lower valve cover; 18-pressure relief pilot valve; 19-reversing valve core; 20-pressure relief port; 21-pilot valve return spring; 22-upstream control channel. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] The butterfly valve with downstream pipe burst emergency shut-off function described in the present invention includes a butterfly valve body 1, which includes an upstream end 2 for urban water supply, a downstream end 3 for urban water supply and a butterfly plate 4. The upper and lower ends of the butterfly plate 4 are respectively connected to the upper valve stem 8 and the lower valve stem 15. A torsion spring 16 is connected between the lower valve stem 15 and the butterfly valve body 1. Specifically, in this embodiment, a lower valve cover 17 is installed at the bottom end of the butterfly valve body 1. The torsion arm at one end of the torsion spring 16 is inserted into the lower valve cover 17, and the torsion arm at the other end is connected to the lower valve stem 15. When the butterfly plate 4 rotates, it drives the lower valve stem 15 to rotate, causing the torsion spring 16 to undergo elastic deformation.

[0034] The upper valve stem 8 is provided with a main control channel 11, and an upstream control channel 22 is provided on one side of the butterfly valve body 1, one end of which is connected to the upstream end 2 of the city water supply, and the other end is connected to the main control channel 11, so that the water in the upstream end 2 of the city water supply can flow into the main control channel 11, thereby making the main control channel 11 have water pressure; the top of the butterfly plate 4 is provided with a receiving hole 5, and the receiving hole 5 is provided with a pin return spring 6; the bottom end of the main control channel 11 is provided with a through hole in the radial direction, and the connecting pin 7 is placed in the through hole, and the connecting pin 7 is provided in the through hole. A sealing ring is provided between the connecting pin 7 and the wall of the through hole. When water pressure exists in the main control channel 11, the connecting pin 7 can be pushed outward by the water pressure, so that the connecting pin 7 is inserted into the accommodating hole 5, thereby connecting the upper valve stem 8 and the butterfly plate 4 as a whole. The pin return spring 6 is against the end of the connecting pin 7. When the water pressure in the main control channel 11 drops to below the threshold, that is, when the water pressure drops to less than the elastic force of the spring, the pin return spring 6 can push the connecting pin 7 to move into the valve stem, so that the butterfly plate 4 is separated from the valve stem and the connecting pin 7.

[0035] There is a preferred way to connect the upstream control channel 22 with the main control channel 11. The outer wall of the upper valve stem 8 is provided with an upper valve stem upstream control channel 9 along the circumference. The upper valve stem upstream control channel 9 is arc-shaped. Specifically, a groove is provided on the upper valve stem 8, and a sealing sleeve 14 is wrapped around the upper valve stem 8. The sealing sleeve 14 and the groove surround the upper valve stem upstream control channel 9. A through hole is provided on the sealing sleeve 14, so that the upstream control channel 22 is connected to the upper valve stem upstream control channel 9. A through hole is provided on the sealing sleeve 14, so that the upstream control channel 22 is connected to the upper valve stem upstream control channel 9. The ends are connected through a through hole. When the upper valve stem 8 is rotated to the valve closing state (i.e. the first extreme position), the upstream control channel 22 can be connected with the main control channel 11 through the upper valve stem upstream control channel 9. At this time, the water in the upstream end 2 of the urban water supply can enter the main control channel 11; when the valve stem is rotated to the butterfly valve closing state (i.e. the second extreme position), the main control channel 11 is disconnected from the upstream control channel 22. At this time, the water in the main control channel 11 is sealed, so that the connecting pin 7 remains extended outward, so that the upper valve stem 8 is connected to the butterfly plate 4.

[0036] The butterfly valve with downstream pipe burst emergency shutdown function described in the present invention also includes a downstream control channel 13, one end of which is connected to the downstream end 3 of the city water supply, and the other end is connected to the main control channel 11 through the pipe burst emergency shutdown control channel 12, and a pressure relief pilot valve 18 is connected in series between the downstream control channel 13 and the pipe burst emergency shutdown control channel 12. When the water pressure in the downstream end 3 of the city water supply is greater than the threshold, the pressure relief pilot valve 18 can block the pipe burst emergency shutdown control channel 12. When the water pressure in the downstream end 3 of the city water supply is less than the threshold, the liquid in the main control channel 11 can be discharged through the pressure relief pilot valve 18.

[0037] There is a preferred way to connect the pipe burst emergency control channel and the main control channel 11. The outer wall of the upper valve stem 8 is provided with an upper valve stem 8 pipe burst emergency shutdown control channel 12 along the circumference. The upper valve stem pipe burst emergency shutdown control channel 10 is arc-shaped. Specifically, a groove is provided on the upper valve stem 8 and is surrounded by the groove of the sealing sleeve 14 to form the upper valve stem pipe burst emergency shutdown control channel 10. The sealing sleeve 14 is provided with a through hole, so that the upper valve stem upstream control channel 9 and the upper valve stem pipe burst emergency shutdown control channel 10 are respectively connected to the main control channel 11 through the through holes.

[0038] In order to maintain the water pressure in the main control channel 11 during operation and to ensure that the butterfly valve can be shut off in time when a pipe burst occurs downstream, in a preferred solution, one end of the pressure relief pilot valve 18 is connected to the downstream control channel 13, and the pressure relief pilot valve 18 includes a pressure relief port 20, a pilot valve return spring 21 and a reversing valve core 19 from top to bottom. The connecting port between the pipe burst emergency shut-off switch and the pressure relief pilot valve 18 is placed above the connecting port between the downstream control channel 13 and the pressure relief pilot valve 18, and the reversing valve core 19 can move between the two connecting ports, and when the reversing valve core 19 is placed in the lower limit position, it can block the downstream control channel 13, and at this time the pressure relief port 20 is connected to the pipe burst emergency shut-off channel. When the reversing valve core 19 moves upward, it can first block the pipe burst emergency shut-off channel, and then as the reversing valve core 19 continues to move upward, the pipe burst emergency shut-off channel is connected to the downstream control channel 13. In order to prevent the water medium in the upstream control channel 22 from being directly connected to the pressure relief port 20, causing the water medium in the upstream end 2 of the city water supply to leak from the pressure relief port 20, the angles corresponding to the arcs of the upper valve stem upstream control channel 9 and the upper valve stem pipe burst emergency shutdown control channel 10 are both less than 90°, and when the butterfly valve is opened to the limit position, the upper valve stem upstream control channel 9 is disconnected from the upstream control channel 22, and when the butterfly valve is closed to the limit position, the upper valve stem pipe burst emergency shutdown control channel 10 is disconnected from the pipe burst emergency shutdown control channel 12. In a preferred embodiment, the angle corresponding to the arc of the upper valve stem pipe burst emergency shutdown control channel 10 is 30°, the angle corresponding to the arc of the upper valve stem upstream control channel 9 is 65°, and the angle between the line connecting the end of the upper valve stem 8 pipe burst emergency shutdown channel and the axis of the upper valve stem 8 and the axis of the pipe burst emergency shutdown channel is 60°, so that the arc length of the upper valve stem pipe burst emergency shutdown control channel 10 is equal to the sum of the arc length of the upper valve stem upstream control channel 9 and the arc length of the upper valve stem 8 corresponding to the 90° angle plus the inner diameter of the upstream control channel 22.

[0039] In the specific working process, the reversing valve core 19 is compressed by the pilot valve return spring 21, so that the reversing valve core 19 can block the connection between the pressure relief valve core and the downstream control channel 13. In the process of opening the butterfly valve, the downstream end 3 of the city water supply is gradually filled with liquid, so that the water pressure at the downstream end 3 of the city water supply is gradually increased. The downstream control channel 13 is affected by the increase in the downstream end water pressure, so that the reversing valve core 19 overcomes the pilot valve return spring 21 and moves upward, blocking the burst pipe emergency shutdown control channel 12, preventing the liquid in the main control channel 11 from being discharged from the burst pipe emergency shutdown control channel 12, and At this time, the main control channel 11 is disconnected from the upstream control channel 22 and connected to the pipe burst emergency shutdown control channel 12. As the valve stem continues to rotate, the water pressure at the downstream end 3 of the city water supply continues to increase, and continues to push the reversing valve core 19 upward, so that the reversing valve core 19 blocks the pressure relief port 20 of the pressure relief pilot valve 18. At the same time, the downstream control channel 13 is connected to the pipe burst emergency shutdown control channel 12 through the pressure relief pilot valve 18, and continues to provide pressure to the main control channel 11 through the medium pressure in the downstream, so that the connecting pin 7 is inserted into the butterfly plate 4, ensuring a reliable connection between the upper valve stem 8 and the butterfly plate 4.

[0040] The butterfly valve with downstream pipe burst emergency shut-off function described in the present invention, during the normal opening process, the medium water in the pipeline enters the upstream end 2 of the butterfly valve for urban water supply. At this time, the water pressure in the upstream end 2 of the urban water supply is relatively high, and the medium water can enter the upstream control channel 22, so that the connecting pin 7 extends outward under the action of the water pressure, thereby connecting the upper valve stem 8 and the butterfly plate 4 as a whole, and rotating the valve stem to control the rotation of the butterfly plate 4; in this embodiment, when the butterfly valve is opened 60°, the pressure at the downstream end 3 of the urban water supply increases with the injection of upstream medium water, and part of the medium water enters the downstream control channel 13, so that the reversing valve core 19 overcomes the pressure of the pilot valve return spring 21, thereby blocking the pipe burst. The emergency shut-off control channel 12 is connected to the pressure relief port 20 of the pressure relief pilot valve 18, and the downstream medium water enters the main control channel 11 through the downstream control channel 13, the internal cavity of the pressure relief pilot valve 18, the pipe burst emergency shut-off control channel 12, and the upper valve stem pipe burst emergency shut-off control channel 10. At this time, the water pressure of the downstream medium water acts on the connecting pin 7, so that the upper valve stem 8 and the butterfly plate 4 are reliably connected, and the valve stem can continue to be rotated to drive the butterfly plate 4 to rotate. When the valve stem rotates more than 65°, the main control channel 11 is disconnected from the upstream control channel 22, and the connection relationship between the upper valve stem 8 and the butterfly plate 4 is supported by the pressure of the downstream medium water until the butterfly valve is fully opened. During the rotation of the upper valve stem 8 of the butterfly valve, Since the lower valve stem 15 is connected to the butterfly plate 4, the lower valve stem 15 rotates, and the torsion spring 16 undergoes elastic deformation. When an emergency such as a pipe burst occurs downstream, causing the medium water in the pipeline to lose rapidly, the medium water pressure in the pipeline decreases rapidly, and due to the increase in the water flow velocity in the pipeline, a negative pressure is generated in the downstream control channel 13 through the principle of water flow injection, and the medium water in the downstream control channel 13 is quickly discharged, causing the reversing valve core 19 to shift under the action of the pilot valve return spring 21, connecting the pipe burst emergency shut-off control channel 12 with the pressure relief valve exhaust port, so that the medium water in the main control channel 11 is discharged, the water pressure in the main control channel 11 is emptied, and the connecting pin 7 is disconnected when the water is lost. After the pressure is applied, the pin is retracted into the main control channel 11 through the influence of the pin return spring 6, thereby separating the upper valve stem 8 from the butterfly plate 4, and the torsion spring 16 loses its restriction. The lower valve stem 15 and the butterfly plate 4 are reset under the action of the torsion spring 16, driving the butterfly plate 4 to rotate, so that the butterfly valve is urgently closed to prevent a large amount of water resources from being wasted; when the downstream pipeline is repaired, the upper valve stem 8 is rotated to the initial position, so that the main control channel 11 is connected with the upstream control channel 22, and the pressurized water medium in the upstream end 2 of the urban water supply re-enters the main control channel 11, so that the pin extends outward and connects with the butterfly plate 4, and the control of the upper valve stem 8 on the butterfly plate 4 is restored, so that the butterfly valve can be used normally.

[0041] Optionally, in order to provide positive pressure in the main control channel 11, in addition to providing positive pressure through the water pressure of the medium water in the upstream, pressurized gas or liquid can be filled into the main control channel 11 during the production process, so that positive pressure is maintained in the main control channel 11 before the downstream pipe burst, so as to control the connection between the connecting pin 7 and the gate plate through positive pressure. When the pipe burst occurs downstream, the main control channel 11 is connected to the pressure relief port 20 of the pressure relief pilot valve 18, so that the pressurized gas or liquid in the main control channel 11 is discharged. After eliminating the safety hazards downstream, the gate valve or valve stem is replaced to restore the function of the gate valve at this node.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A butterfly valve with a downstream pipe burst emergency shutoff function, characterized by: include A butterfly valve body (1) comprises an upstream end (2) for urban water supply, a downstream end (3) for urban water supply and a butterfly plate (4), wherein both ends of the butterfly plate (4) are respectively connected to an upper valve stem (8) and a lower valve stem (15), and a torsion spring (16) is connected between the lower valve stem (15) and the butterfly valve body (1), so that when the lower valve stem (15) rotates, the torsion spring (16) can be elastically deformed; A main control channel (11) is formed in the upper valve stem (8), and a connecting pin (7) is radially provided at the bottom end of the main control channel (11). When positive pressure is formed in the main control channel (11), the pin protrudes outward and inserts into the butterfly plate (4), so that the valve stem can drive the butterfly plate (4) to rotate; The downstream control channel (13) is connected to the main control channel (11) at one end through the pressure relief pilot valve (18), and is connected to the city water supply downstream end (3) at the other end. When the pressure at the city water supply downstream end (3) decreases below a threshold value, the main control channel (11) can be connected to the pressure discharge port of the pressure relief pilot valve (18), and at this time, the pin is separated from the butterfly plate (4).

2. A butterfly valve with a downstream pipe burst emergency shutoff function according to claim 1, characterized in that: A lower valve cover (17) is fixedly provided at the bottom of the butterfly valve body (1); one end of the torsion arm of the torsion spring (16) is inserted into the lower valve cover (17), and the other end of the torsion arm is inserted into the lower valve stem (15).

3. The butterfly valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The pressure relief pilot valve (18) is connected to the main control channel (11) through a burst pipe emergency shut-off control channel (12). A reversing valve core (19) and a pilot valve return spring (21) capable of moving along the length direction of the pressure relief pilot valve (18) are provided in the pressure relief pilot valve (18). The pilot valve return spring (21) abuts against the end of the reversing valve core (19). When the water pressure at the downstream end (3) of the city water supply is lower than a threshold value, the pilot valve return spring (21) can press the reversing valve core downward so that the reversing valve core (19) blocks the pipe opening of the downstream control channel (13).

4. The butterfly valve with downstream pipe burst emergency shutoff function according to claim 3, characterized in that: An upper valve stem burst pipe emergency shutoff control channel (10) is opened along the outer wall of the upper valve stem (8), which is connected to the main control channel (11) through a through hole, and the upper valve stem burst pipe emergency shutoff control channel (10) is arc-shaped. The burst pipe emergency shutoff control channel (12) can be connected to the main control channel (11) through the upper valve stem burst pipe emergency shutoff control channel (10).

5. The butterfly valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The butterfly plate (4) has a receiving hole (5) at the top, and a pin reset spring (6) is built into the receiving hole (5). The end of the connecting pin (7) abuts against the pin reset spring (6), and the connecting pin (7) can be inserted into the receiving hole (5).

6. The butterfly valve with downstream pipe burst emergency shutoff function according to claim 4, characterized in that: It also includes an upstream control channel (22), one end of which is in communication with the upstream end (2) of the city water supply, and the other end of which is in communication with the main control channel (11).

7. The butterfly valve with downstream pipe burst emergency shutoff function according to claim 5, characterized in that: The main control channel (11) is provided with an upper valve stem upstream control channel (9) along its circumference, and the upper valve stem upstream control channel (9) is communicated with the main control channel (11) via a through hole.

8. The butterfly valve with downstream pipe burst emergency shutoff function according to claim 7, characterized in that: The angles corresponding to the arcs of the upper valve stem upstream control channel (9) and the upper valve stem pipe burst emergency shutdown control channel (10) are both less than 90 degrees, and when the butterfly valve is opened to the extreme position, the upper valve stem upstream control channel (9) is disconnected from the upstream control channel (22).

Images