A cylinder over-flow shut-off valve

Abstract

This invention discloses a gas cylinder overflow shut-off valve, comprising a main valve body with an internally formed medium channel and a sealing protrusion; a sealing ball disposed within the main valve body, located below the sealing protrusion, for engaging with the sealing protrusion to close the medium channel; an opening / closing assembly located at the top of the main valve body and communicating with the interior of the main valve body, for opening or closing the medium channel; and a reset assembly located at the side end of the main valve body and communicating with the medium channel, for pushing the sealing ball abutting the sealing protrusion away. This application, by setting a combined gasket inside the main valve body, utilizes the cooperation between the sealing ball and the combined gasket to complete the closure of the internal medium channel of the main valve body, thereby further improving the overflow shut-off performance of the overflow shut-off valve and the sealing performance of the main valve body when overflow occurs in the liquefied gas cylinder, and enhancing the overflow shut-off performance of the valve and the sealing performance of the main valve body.

Description

Technical Field

[0001] This invention belongs to the field of valve technology for liquefied gas cylinders, and specifically relates to a gas cylinder overflow shut-off valve. Background Technology

[0002] A liquefied petroleum gas (LPG) tank is a storage tank used to store liquefied petroleum gas. When it contains LPG, the pressure inside is very high, and even slight improper operation may cause an explosion. It is classified as special equipment.

[0003] Currently, the valves of most liquefied petroleum gas (LPG) cylinders on the market are mainly closed valves, also known as rotary butterfly valves. During use, the valve body needs to be rotated to open and close. If the closed valve, the downstream pipeline, or the user's end malfunctions during the use of the LPG cylinder, it will cause the LPG cylinder to leak. That is, the LPG will overflow when passing through the valve body. However, the current closed valves do not have an overflow cut-off function, which will cause the LPG in the cylinder to flow out continuously, thus posing a threat to public safety. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A gas cylinder overcurrent shut-off valve, comprising: The main valve body has internally formed media channels and sealing protrusions; A sealing ball, located in the main valve body and below the sealing protrusion, is used to cooperate with the sealing protrusion to seal the medium passage; The opening and closing assembly is located at the top of the main valve body and communicates with the inside of the main valve body. It is used to open or close the medium passage. The reset assembly, located on the side of the main valve body and connected to the medium passage, is used to push away the sealing ball that is attached to the sealing protrusion. Combination mats; A support tube is installed inside the main valve body, and the combined gasket is constrained by the support tube between the sealing ball and the sealing protrusion; The combined gasket forms a soft seal for the sealing ball.

[0005] Furthermore, the combined gasket includes a flat gasket and a gasket liner. The outer wall of the flat gasket is in contact with and sealed to the inner wall of the main valve body, and the inner wall of the flat gasket is in contact with and sealed to the outer wall of the gasket liner.

[0006] Furthermore, the cross-section of the gasket rubber ring is I-shaped.

[0007] Furthermore, the thickness of the flat pad is less than the thickness of the lining rubber ring.

[0008] Furthermore, the gasket ring has an interlocking portion conforming to the sealing ball, and annular wings symmetrically arranged at the end of the interlocking portion.

[0009] Furthermore, the outer diameter of the ring wing is larger than the inner diameter of the flat pad.

[0010] Furthermore, the annular wing gradually tilts radially outward toward the flat pad side.

[0011] Furthermore, the upper end of the support tube has a notch that can mate with the reset assembly.

[0012] Furthermore, an air inlet pipe that can support the sealing ball can be detachably connected to the air inlet end of the main valve body, and the air inlet pipe and the support pipe are coaxially arranged.

[0013] Furthermore, an air intake hole is provided on the peripheral wall of the air intake pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This application improves the sealing performance of the overflow shut-off valve and the sealing performance of the main valve body by setting a combined gasket inside the main valve body and using the sealing ball to cooperate with the combined gasket to complete the sealing of the medium channel inside the main valve body. This invention employs a combined gasket to form a soft sealing structure. Compared to the hard seals in existing technologies, the soft seal can better fit the mating surfaces of the sealing ball and the flat gasket, effectively compensating for assembly errors and structural deformation. It can also effectively compensate for minor imperfections on the surface of the sealing ball, preventing leakage compared to existing sealing methods. The combined gasket in this embodiment combines rigidity and elasticity, resulting in a longer service life and simpler assembly. It eliminates the need for additional sealing auxiliary parts, simplifying the structure and ensuring that after the valve is shut off, the medium flow rate at the outlet is controlled within the design range (not exceeding 200 mL / h), meeting the leakage requirements of the mandatory GB 35208-2025 standard. This significantly improves product quality stability, enabling it to consistently pass various quality tests. The reset assembly is located on the side (front) of the main valve body, and its interaction with the sealing ball occurs in the medium channel, rather than on the rear side of the sealing part. Compared with the structure of the reset assembly being located at the rear in the prior art, it can significantly shorten the length of the valve body side port / air outlet, reduce the amount of copper material used, and at the same time, it does not require adding too many extra parts and accessories, simplifying the overall structure and manufacturing process, reducing the difficulty and cost of parts processing and assembly, and has a significant cost advantage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the exploded structure of a specific embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the overall structure of a specific embodiment of the present invention; Figure 3 A cross-sectional structural diagram illustrating a specific embodiment of the present invention; Figure 4for Figure 3 A magnified view of a portion of point A in the middle; Figure 5 A partial structural diagram illustrating a specific embodiment of the present invention (view 1); Figure 6 To illustrate a partial structural diagram in a specific embodiment of the present invention (perspective two); Figure 7 This is a three-dimensional structural diagram illustrating a specific embodiment of the combined pad of the present invention; Figure 8 This is a schematic diagram illustrating the exploded structure of the combined pad in a specific embodiment of the present invention; Figure 9 This is a cross-sectional view of the combined pad in a specific embodiment of the present invention; Figure 10 This is a cross-sectional view of the combined gasket, sealing ball, and reset assembly in a specific embodiment; The reference numerals in the accompanying drawings include: Main valve body 1, medium channel 10, sealing protrusion 11, air outlet 12, air inlet pipe 2, air inlet hole 20, sealing ball 3, opening and closing assembly 4, valve handwheel 40, valve body 41, valve gasket 42, connecting piece 43, reset assembly 5, reset valve stem 50, support pipe 6, notch 60, combination gasket 7, flat gasket 70, gasket rubber ring 71, interlocking part 710, ring wing 711. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0018] like Figure 1 - Figure 10 As shown, a gas cylinder overflow shut-off valve of the present invention includes a main valve body 1, an air inlet pipe 2, a sealing protrusion 11, a sealing ball 3, an opening and closing assembly 4, a support pipe 6 combined with a gasket 7, and a reset assembly 5.

[0019] The main valve body 1 is cast, and the interior of the main valve body 1 has a medium channel 10.

[0020] One end of the air inlet pipe 2 is fixedly installed on the air inlet end of the main valve body 1, and the other end of the air inlet pipe 2 is fixedly connected to the air outlet pipe of the liquefied gas tank. The air outlet end 12 of the air inlet pipe 2 is connected to the medium channel 10, and the air inlet end of the air inlet pipe 2 is connected to the air outlet end 12 of the liquefied gas tank. The air inlet pipe 2 can also be the air outlet pipe of the liquefied gas tank.

[0021] The main valve body 1 and the intake pipe 2 are detachably fixedly connected. The detachable fixed connection includes, but is not limited to, plug-in, snap-fit ​​or threaded connection. In this embodiment, the main valve body 1 and the intake pipe 2 are connected by a thread.

[0022] The intake pipe 2 extends into the main valve body 1. Under the action of gravity, the sealing ball 3 is located at the concave / arc position at the top of the intake pipe 2. The intake pipe 2 provides support for the sealing ball 3. The intake pipe 2 and the support pipe 6 are coaxially arranged.

[0023] like Figure 4 As shown, the sealing protrusion 11 is formed inside the main valve body 1. The sealing protrusion 11 has a through hole for the passage of the gas medium (liquefied petroleum gas) and forms an annular shape. The sealing protrusion 11 is integrally formed with the main valve body 1.

[0024] The main valve body 1 is made of copper, which has good sealing performance, corrosion resistance and mechanical strength, and is suitable for the medium characteristics of liquefied petroleum gas.

[0025] The sealing ball 3 is placed inside the main valve body 1, and the sealing ball 3 is located between the air inlet pipe 2 and the sealing protrusion 11.

[0026] In this embodiment, the sealing ball 3 is made of rubber or metal and is used to fit against the sealing protrusion 11 to seal the medium channel 10. In other embodiments, the sealing ball 3 may also be made of other flexible materials with sealing functions.

[0027] The opening and closing assembly 4 is located at the top of the main valve body 1 and communicates with the interior of the main valve body 1. It is used to open or close the medium channel 10. The opening and closing assembly 4 includes a valve handwheel 40 and a valve body 41 arranged from top to bottom. The valve handwheel 40 and the valve body 41 are connected by a valve stem. A valve pad 42 is provided inside the valve body 41. The valve handwheel 40 is rotatably connected to the main valve body 1. The valve pad 42 can abut against the upper end of the sealing protrusion 11, thereby closing the medium channel 10.

[0028] In use, by turning the valve handwheel 40, the valve stem drives the valve body 41 to rotate through the connecting piece 43, and then the valve pad 42 can squeeze the upper part of the sealing protrusion 11, thereby closing the medium channel 10.

[0029] When it is necessary to open, the valve body 41 and valve gasket 42 no longer squeeze and disengage from the sealing protrusion 11 by reversing the valve handwheel 40, thereby opening the medium channel 10, and the gas medium can enter the gas outlet 12 of the main valve body 1 through the medium channel 10.

[0030] The aforementioned opening and closing component 4 is prior art. The specific structure and connection form can be referred to the technical solutions mentioned in the background art or patent document CN202311462030.X. The above structure is not within the protection scope of this application. Therefore, it has at least the beneficial effects brought by the technical solutions of the above embodiments, and will not be described in detail here.

[0031] The reset assembly 5 is located on the side (front) of the main valve body 1, and its interaction with the sealing ball 3 occurs in the medium channel 10, rather than on the rear side of the blocking part. Compared with the rear-positioned structure of the reset assembly 5 in the prior art, it can significantly shorten the length of the valve body side port / air outlet 12, reduce the amount of copper material used, and at the same time, it does not require the addition of too many parts and accessories, simplifying the overall structure and production process, reducing the difficulty and cost of parts processing and assembly, and has obvious cost advantages.

[0032] The reset assembly 5 uses a reset valve stem 50, spring, sealing ring and other structures, which is simple to operate and can be manually reset after the overcurrent is cut off, ensuring that there is no leakage after the valve is cut off.

[0033] This overcurrent shut-off valve has a compact overall structure, few parts, and simple assembly process, making it easy to mass-produce and maintain. The rated shut-off flow rate can be precisely controlled within the range of 3.6 m³ / h to 5.4 m³ / h by adjusting the distance between the sealing ball 3 and the combination gasket 7 (the length of the air inlet pipe 2, or by changing the length of the support pipe 6), thus meeting standard requirements. When an overflow occurs in the liquefied gas tank, this overflow shut-off valve uses the sealing ball 3 and the sealing protrusion 11 to seal the medium passage 10 inside the main valve body 1, thereby completing the overflow shut-off of the valve in the liquefied gas tank. After the fault is cleared, the valve is reopened by the reset assembly 5 to restore the normal use of the overflow shut-off valve.

[0034] The combined gasket 7 can be constrained by the support tube 6 between the sealing ball 3 and the sealing protrusion 11, forming a soft seal on the sealing ball 3.

[0035] This application improves the overflow cut-off performance of the overflow cut-off valve and the sealing performance of the main valve body 1 by setting a combination gasket 7 inside the main valve body 1 and using the sealing ball 3 in cooperation with the combination gasket 7 to complete the sealing of the medium channel 10 inside the main valve body 1. In practical applications, the rated cut-off flow rate can be precisely controlled within the range of 3.6 m³ / h to 5.4 m³ / h by adjusting the distance between the sealing ball 3 and the top of the medium channel 10, thus meeting standard requirements.

[0036] The reset component 5 adopts a push rod structure, which is simple to operate. It can achieve manual reset after overcurrent cut-off, and can also prevent the steel ball from entering the closed position when a large flow of gas needs to be released, thus meeting the needs of different application scenarios.

[0037] This invention uses a combination gasket 7 to form a soft sealing structure. Compared with the hard seal in the prior art, the soft seal can better fit the mating surfaces of the sealing ball 3 and the flat gasket 70, effectively compensating for assembly errors and structural deformation. It can also effectively compensate for assembly errors and minor defects on the surface of the sealing ball 3, avoiding leakage. Compared with existing sealing methods, the combination gasket 7 in this embodiment has both rigidity and elasticity, a longer service life, and is easier to assemble. It does not require additional sealing auxiliary parts, further simplifying the structure. It ensures that after the valve is shut off, the medium flow rate at the outlet is controlled within the design range (not greater than 200mL / h), meeting the leakage requirements of the mandatory standard GB35208-2025. The product quality stability is greatly improved, and it can stably pass various quality tests. Specifically, such as Figures 4 to 10 As shown, the combined gasket 7 includes a flat gasket 70 and a gasket rubber ring 71. The outer wall of the flat gasket 70 contacts and seals with the inner wall of the main valve body 1, and the inner wall of the flat gasket 70 contacts and seals with the outer wall of the gasket rubber ring 71.

[0038] The combined gasket 7 consists of two parts: a flat gasket 70 and a gasket rubber ring 71. The two parts fit together to form a double sealing structure, which has superior sealing reliability and structural stability compared to ordinary soft or hard seals in the prior art. The flat gasket 70 is made of low carbon steel, which has good rigidity and support, and can withstand the impact pressure of the sealing ball 3, preventing the combined gasket 7 from deforming as a whole. The outer wall of the flat gasket 70 is in close contact with the inner wall of the main valve body 1, forming the first sealing surface, which can effectively prevent the gas medium from leaking from the gap between the flat gasket 70 and the valve body. The inner wall of the flat gasket 70 is in close contact with the outer wall of the gasket rubber ring 71, forming a second sealing surface, which further enhances the sealing redundancy and prevents media leakage.

[0039] In this embodiment, the gasket 71 can be made of oil-resistant and corrosion-resistant nitrile rubber. Its cross-section is I-shaped. The specific structure includes an insertion part 710 that conforms to the steel ball (sealing ball 3) and annular wings 711 symmetrically arranged at both ends of the insertion part 710. This structural design is significantly different from the ordinary flat plate type and annular soft sealing structure in the prior art. Moreover, the thickness of the flat gasket 70 is less than the thickness of the gasket 71, ensuring that the gasket 71 can fully exert its elastic sealing function. At the same time, the flat gasket 70 provides stable support for it, preventing the gasket from being damaged due to excessive force.

[0040] It is worth noting that the outer diameter of the ring wing 711 is larger than the inner diameter of the flat gasket 70. When the combined gasket 7 is assembled, the edge of the ring wing 711 can overlap the end of the flat gasket 70 to form a limiting structure, preventing the gasket rubber ring 71 from shifting under the impact of the sealing ball 3, and ensuring accurate sealing position.

[0041] In addition, the ring wing 711 in this embodiment adopts a structure design that gradually tilts outward radially toward the flat pad 70. The tilt angle is controlled between 15° and 30°, which can ensure the tight fit between the ring wing 711 and the flat pad 70, and also allow the ring wing 711 to produce appropriate elastic deformation when the sealing ball 3 is squeezed, further filling the sealing gap and improving the sealing effect.

[0042] The assembly position of the combined gasket 7 is located at the bottom of the sealing protrusion 11, and is limited in the medium channel 10 by the support tube 6, facing the sealing ball 3. When the sealing ball 3 moves upward to this position during flow, the surface of the sealing ball 3 is tightly attached to the gasket lining layer of the combined gasket 7, and the gasket lining layer is squeezed to undergo slight elastic deformation, achieving complete sealing and ensuring that the medium flow rate of the outlet after cut-off is not greater than 200mL / h, which meets the standard requirements.

[0043] Compared with the prior art, the soft sealing structure of the combined gasket 7 (flat gasket 70 + I-shaped gasket rubber ring 71) in this embodiment has more stable sealing performance than the existing hard seal. It can effectively compensate for assembly errors, minor defects on the surface of the sealing ball 3 / steel ball and the machining errors of the inner wall of the main valve body 1 through the double sealing cooperation of the flat gasket 70 and the gasket rubber ring 71, and completely avoid leakage. The combined gasket 7 in this technical solution features a double-sealing structure that enhances sealing reliability and effectively prevents media leakage from assembly gaps. It is particularly suitable for meeting the stringent requirement of GB 35208-2025 standard that "the flow rate at the outlet after shut-off shall not exceed 200 mL / h". Actual testing has shown that valves using this combined gasket 7 structure can control leakage to within 100 mL / h after shut-off, which is far superior to the standard limit and significantly improves quality stability.

[0044] The I-shaped gasket 71 enhances sealing adaptability: the intersecting part 710 of the gasket 71 conforms to the shape of the steel ball and can fit tightly with the surface of the steel ball, avoiding sealing dead corners. The symmetrical arrangement of the ring wing 711 not only achieves precise positioning and matching with the flat gasket 70 to prevent displacement of the rubber ring, but its inclined design can also produce "adaptive deformation" when the steel ball is squeezed. That is, the ring wing 711 will fit appropriately with the pressure direction of the steel ball to further fill the sealing gap. Even if there is slight wear on the surface of the steel ball or slight deviation in assembly, the sealing effect can be guaranteed, which solves the problems of poor adaptability and easy leakage of existing soft sealing structures.

[0045] The thickness ratio of the flat gasket 70 to the gasket ring 71 extends service life: the thickness of the flat gasket 70 is less than that of the gasket ring 71. This ensures the rigid support of the flat gasket 70, preventing the gasket ring 71 from deforming or being damaged due to excessive force, while also allowing the gasket ring 71 to fully exert its elastic sealing performance and reduce the wear rate of the ring. At the same time, the rigid support of the flat gasket 70 can also prevent the gasket ring 71 from aging and collapsing during long-term use, ensuring the long-term stable sealing performance of the combined gasket 7. Compared with existing ordinary soft sealing components, the service life can be extended by more than 30%.

[0046] The structural design simplifies assembly and reduces maintenance costs: the mating structure of the flat gasket 70 and the gasket ring 71 is simple. During assembly, simply embed the gasket ring 71 into the inner wall of the flat gasket 70, and then fix the combined gasket 7 to the bottom of the valve body 41. No additional fixing accessories are required. Moreover, the limiting function of the ring wing 711 can prevent the gasket from shifting during assembly, thus improving assembly efficiency. In the later maintenance, the combined gasket 7 can be directly replaced as a whole, which is simple to operate and reduces maintenance costs. Compared with the existing complex soft sealing structure, the assembly efficiency is improved by more than 20%.

[0047] It should be noted that when the overcurrent cut-off is a steel ball, the steel ball will not fall down without external force due to the pressure difference. If a reset is required, the steel ball can be pushed by pushing the reset component to release the seal and allow the steel ball to fall down and reset.

[0048] The reset component serves two purposes: first, when the overcurrent is cut off and the steel ball is suspended at the bottom of the combined gasket, the push rod is used to push the steel ball to change its sealing state and reset it; second, when a large amount of venting is required for manufacturing and testing, the push rod needs to be pushed into place and held for the entire venting period so that the steel ball cannot reach the sealing position.

[0049] like Figure 3 As shown, during the use of the overcurrent shut-off valve, the medium channel 10 inside the main valve body 1 is opened by turning the valve handwheel 40 of the opening and closing assembly 4. The liquefied gas in the liquefied gas tank enters the medium channel 10 through the air inlet 20 on the air inlet pipe 2, and then is discharged through the air outlet 12 of the main valve body 1. When the overcurrent shut-off valve malfunctions and the liquefied gas leaks and overflows, the sealing ball 3 inside the main valve body 1 is blown up by the gas medium and presses against the combination gasket 7. The sealing ball 3 closes the medium channel 10 by contacting the combination gasket 7, thereby preventing the liquefied gas from continuing to leak. Then, the valve handwheel 40 of the opening and closing assembly 4 is turned to close the medium channel 10.

[0050] After troubleshooting, press the push cover of the reset assembly 5 to push the reset valve stem 50 to push the sealing ball 3, thereby disengaging the sealing ball 3 from the assembly gasket and allowing the overcurrent shut-off valve to resume normal operation.

[0051] Specifically, the reset valve stem 50 is engaged with the notch 60 of the support tube 6. The front end of the reset valve stem 50 is tapered. In the press-fit reset valve stem 50, the reset valve stem 50 extends into the support tube 6 from the notch 60 and acts on the sealing ball 3.

[0052] This technical solution has the following core advantages. (1) Fully compatible with GB 35208-2025 mandatory standard: zero / low leakage is achieved through soft sealing of combined gaskets, automatic reset is prevented through manual push rod reset, and all performance indicators meet the standard requirements; (2) Reliable sealing and stable quality: The soft sealing structure of the combined gasket can effectively compensate for assembly errors and structural deformation, the leakage is controllable, the product quality stability is greatly improved, and safety hazards caused by sealing failure are avoided. (3) Low production cost and high cost performance: The front-mounted reset component reduces the amount of copper material and the number of parts, simplifies the process, and reduces production and maintenance costs, which has a significant cost advantage compared with existing technologies; (4) Simple structure and easy to use: The overall structure is compact and easy to assemble. Manual reset and large-flow gas release are simple to operate, which is suitable for the actual use scenarios of liquefied petroleum gas cylinders and facilitates large-scale production and promotion.

[0053] It should be noted that this overcurrent shut-off valve is applied to gas cylinders / tanks, and the media contained in the gas cylinders / tanks include, but are not limited to, methanol, liquefied petroleum gas, and other fuel media such as liquefied dimethyl ether.

[0054] It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A gas cylinder overcurrent shut-off valve, characterized in that, include: The main valve body (1) has a media channel (10) and a sealing protrusion (11) formed inside. The sealing ball (3) is located inside the main valve body (1) and below the sealing protrusion (11). It is used to cooperate with the sealing protrusion (11) to close the medium channel (10). The opening and closing assembly (4) is located on the top of the main valve body (1) and communicates with the inside of the main valve body (1) for opening or closing the medium passage (10). The reset assembly (5) is located at the side end of the main valve body (1) and is connected to the medium channel (10) to push open the sealing ball (3) that is attached to the sealing protrusion (11); Combination pad (7); The support tube (6) is located inside the main valve body (1), and the combined gasket (7) is restricted by the support tube (6) between the sealing ball (3) and the sealing protrusion (11); The combined gasket (7) forms a soft seal on the sealing ball (3).

2. The gas cylinder overcurrent shut-off valve as described in claim 1, characterized in that: The combined gasket (7) includes a flat gasket (70) and a gasket rubber ring (71). The outer wall of the flat gasket (70) is in contact with and sealed to the inner wall of the main valve body (1), and the inner wall of the flat gasket (70) is in contact with and sealed to the outer wall of the gasket rubber ring (71).

3. The gas cylinder overcurrent shut-off valve as described in claim 2, characterized in that: The cross-section of the gasket rubber ring (71) is I-shaped.

4. A gas cylinder overcurrent shut-off valve as described in claim 2 or 3, characterized in that: The thickness of the flat pad (70) is less than the thickness of the padding rubber ring (71).

5. A gas cylinder overcurrent shut-off valve as described in claim 2 or 3, characterized in that: The gasket rubber ring (71) has an interlocking portion (710) that conforms to the sealing ball (3) and an annular wing (711) symmetrically arranged at the end of the interlocking portion (710).

6. A gas cylinder overcurrent shut-off valve as described in claim 5, characterized in that: The outer diameter of the ring wing (711) is larger than the inner diameter of the flat pad (70).

7. A gas cylinder overcurrent shut-off valve as described in claim 5, characterized in that: The ring wing (711) gradually tilts radially outward toward the flat pad (70).

8. A gas cylinder overcurrent shut-off valve as described in claim 1, 2, 3, 6, or 7, characterized in that: The upper end of the support tube (6) has a notch (60) that can cooperate with the reset assembly (5).

9. A gas cylinder overcurrent shut-off valve as described in claim 1, 2, 3, 6, or 7, characterized in that: The main valve body (1) may also be detachably connected to an air inlet pipe (2) that can support the sealing ball (3), and the air inlet pipe (2) and the support pipe (6) are coaxially arranged.

10. A gas cylinder overcurrent shut-off valve as described in claim 9, characterized in that: An air inlet (20) is provided on the peripheral wall of the air inlet pipe (2).

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