Gas phase balancing device in sealing ring based on floating disc

Abstract

The utility model discloses an internal gas phase balancing device based on a floating disc sealing ring. The internal gas phase balancing device comprises a tank body, the floating disc can synchronously ascend and descend within the range above the height limiting piece along with the liquid level of the stored liquid in the tank body; the breather valve can communicate or separate the liquid storage chamber and the upper cavity, and when the air pressure difference between the liquid storage chamber and the upper cavity is within a preset range, the breather valve is configured to be in a closed state so as to separate the liquid storage chamber and the upper cavity; the vent valve and the valve body are arranged on the floating disc, the upper end of the valve rod is fixedly connected with the valve deck, the lower end of the valve rod penetrates through the valve body and extends into the liquid storage chamber, and the elastic reset piece is arranged between the valve rod and the valve body or between the valve deck and the valve body. The balancing device can automatically control the gas phase pressure balance of the stored liquid, timely discharge excessive gas during feeding of the storage tank, ensure the sealing performance between the floating disc and the inner wall of the tank body, ensure the normal operation of the stored liquid during daily storage, prevent the discharge from exceeding the standard, reduce the loss of the stored liquid, ensure that the floating disc cannot be damaged due to vacuumizing, and is high in reliability.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical storage technology, and in particular to a gas phase balance device based on the gas phase balance device within the floating disc sealing ring. Background Technology

[0002] A fully submersible floating roof is a sealed device that rises and falls with the liquid level in the storage tank, covering the liquid surface. The floating roof is sealed to the inner wall of the tank by a sealing ring to achieve sealed storage of the liquid.

[0003] For volatile liquids, it is necessary to control the pressure balance of the liquid vapor phase inside the storage tank. During the tank feeding operation, as the floating roof rises along with the liquid level, the total evaporation will increase due to the increased total volume of liquid. Furthermore, the vigorous movement during feeding will further increase evaporation. Excess gas on the underside of the floating roof needs to be discharged promptly, otherwise it will affect the seal between the floating roof and the inner wall of the tank. During daily storage, the liquid is affected by temperature changes throughout the day and seasons. Liquid vaporization upon contact with heat and condensation upon contact with cold will create a pressure difference between the upper and lower sides of the floating roof. However, a pressure difference within a certain range is permissible. Constantly eliminating this pressure difference will lead to excessive emissions and excessive liquid loss. During the tank discharging operation, when the floating roof descends to its lowest position, a cleaning and maintenance clearance is maintained between the floating roof and the tank bottom plate, while the liquid continues to be evacuated. To prevent damage to the floating roof due to vacuuming, air needs to be added to the underside of the floating roof when it descends to its lowest position to ensure that the pressure on the underside of the floating roof is consistent with the pressure on the upper side.

[0004] Currently, to achieve gas phase pressure balance control based on the floating roof seal ring, the main approach is to use real-time gas pressure detection to automatically control the opening and closing of each valve. This method is not only expensive but also lacks reliability. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a low-cost, stable, and reliable gas-phase balancing device based on the internal gas phase of a floating roof seal ring.

[0006] According to an embodiment of the present invention, a floating disc-based gas phase balance device with an internal sealing ring includes: a tank body with a bottom plate at the bottom, and a height limiting member above the bottom plate; a floating disc with a sealing ring on its outer edge, the sealing ring being sealed and fitted to the inner wall of the tank body, the floating disc dividing the interior of the tank body into an upper chamber and a storage chamber, the floating disc being able to rise and fall synchronously with the liquid level in the tank body above the height limiting member, the height limiting member being configured to stop the floating disc; and a breather valve disposed on the floating disc, the breather valve being able to connect or disconnect the storage chamber and the upper chamber, the breather valve being configured to be closed to disconnect the storage chamber and the upper chamber when the pressure difference between the storage chamber and the upper chamber is within a preset range, and the breather valve being configured to be open when the pressure difference between the storage chamber and the upper chamber exceeds the preset range. The system is in an open state to connect the liquid storage chamber and the upper chamber; the vent valve includes a valve body, a valve cover, a valve stem, and a resilient reset member. The valve body is disposed on the floating plate, and the valve stem extends vertically. The upper end of the valve stem is fixedly connected to the valve cover, and the lower end passes through the valve body and extends into the liquid storage chamber. The resilient reset member is disposed between the valve stem and the valve body or between the valve cover and the valve body. When the floating plate is not stopped by the height limiting member, the valve cover can seal and cover the valve body under the action of the resilient reset member to isolate the liquid storage chamber and the upper chamber, and the length of the valve stem extending into the liquid storage chamber is greater than the distance between the height limiting member and the tank bottom plate. When the floating plate is stopped by the height limiting member, the lower end of the valve stem abuts against the tank bottom plate and the valve cover is lifted upward away from the valve body to connect the liquid storage chamber and the upper chamber.

[0007] It has at least the following beneficial effects: This balancing device can automatically control the gas phase pressure balance of the stored liquid. When the pressure difference between the stored liquid chamber and the upper chamber is within a preset range, the breather valve automatically closes to isolate the stored liquid chamber and the upper chamber. When the pressure difference between the stored liquid chamber and the upper chamber exceeds the preset range, the breather valve automatically opens to connect the stored liquid chamber and the upper chamber. This allows for timely discharge of excess gas during tank feeding, ensuring the sealing between the floating roof and the inner wall of the tank, and guaranteeing the normal operation of the stored liquid during daily storage, preventing excessive emissions and reducing liquid loss. When the floating roof is not stopped by the height limiting component, the valve cover, under the action of the elastic reset component... It can seal the valve body to isolate the liquid storage chamber and the upper chamber, and the length of the valve stem extending into the liquid storage chamber is greater than the distance between the height limiter and the bottom plate of the tank. As the floating roof moves downward and approaches the height limiter, the lower end of the valve stem is stopped by the bottom plate of the tank and rises relative to the floating roof and the valve body, thereby causing the valve cover to gradually move upward away from the valve body. When the floating roof is completely stopped by the height limiter, the valve cover is completely lifted away from the valve body to connect the liquid storage chamber and the upper chamber, replenishing the liquid storage chamber with air, making the pressure on the lower side of the floating roof consistent with the upper side of the floating roof, facilitating continued evacuation of the liquid storage, ensuring that the floating roof will not be damaged due to vacuuming, and ensuring stable automatic operation with high reliability.

[0008] According to some embodiments of the present invention, the valve body includes a valve cylinder that extends vertically through the valve body. The lower outer edge of the valve cylinder is fixedly connected to the float. The interior of the valve cylinder is connected to the liquid storage chamber. The valve cover can be sealed and closed or lifted upward away from the upper end of the valve cylinder.

[0009] According to some embodiments of the present invention, the valve body further includes a straightening guide sleeve extending in the vertical direction. The straightening guide sleeve is located inside the valve cylinder and is coaxially arranged with the valve cylinder. The straightening guide sleeve is fixedly connected to the valve cylinder through a connecting plate. The valve stem passes through the straightening guide sleeve and is slidably connected to the straightening guide sleeve in the vertical direction.

[0010] According to some embodiments of the present invention, multiple connecting plates are provided, and the multiple connecting plates are radially distributed along the circumference of the straightening guide sleeve.

[0011] According to some embodiments of this utility model, a clamping ring is provided on the lower side of the valve cover, and the valve cover can press and seal the upper end of the valve cylinder through the clamping ring.

[0012] According to some embodiments of the present invention, a pad is provided on the bottom plate of the tank, and the pad is used to abut the lower end of the valve stem.

[0013] According to some embodiments of the present invention, the floating roof includes a single disc and edge floats. The edge floats are distributed in a ring around the circumference of the single disc. The sealing ring is disposed on the outer edge of the edge floats. The breathing valve is disposed on the edge floats. The venting valve is disposed on the single disc.

[0014] According to some embodiments of the present invention, multiple breathing valves and multiple ventilation valves are provided, with multiple breathing valves arranged in a ring on the edge float and multiple ventilation valves arranged in a ring on the single disc.

[0015] According to some embodiments of the present invention, a gap space is formed between the outer edge of the edge float and the inner wall of the tank body in the area below the sealing ring, which communicates with the liquid storage chamber. An opening communicating with the gap space is provided on the outer edge of the edge float, and the breather valve is connected to the opening through a pipe.

[0016] According to some embodiments of the present invention, when the pressure difference between the liquid storage chamber and the upper chamber is between -294 Pa and 353 Pa, the breathing valve is configured to be closed to isolate the liquid storage chamber and the upper chamber; when the pressure difference between the liquid storage chamber and the upper chamber is less than -294 Pa or greater than 353 Pa, the breathing valve is configured to be open to connect the liquid storage chamber and the upper chamber.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a schematic diagram of the structure of the floating roof when it is stopped by the height limiting component according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the vent valve in an embodiment of the present invention when the valve cover is sealed and closed on the valve body;

[0021] Figure 3 This is a schematic diagram of the structure of the vent valve in an embodiment of the present invention when the valve cover is lifted away from the valve body;

[0022] Figure 4 This is a partial structural schematic diagram of an embodiment of the present utility model.

[0023] Reference numerals: 1. Tank body, 11. Tank bottom plate, 12. Height limiter, 13. Pad, 2. Float, 21. Sealing ring, 22. Single disc, 23. Edge float, 231. Opening, 3. Liquid storage chamber, 4. Upper chamber, 5. Breathing valve, 6. Vent valve, 61. Valve body, 611. Central guide sleeve, 612. Connecting plate, 613. Valve cover, 62. Valve stem, 63. Compression ring, 64. Gap space, 7. Pipe, 8. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, inside, outside, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] Reference Figures 1 to 4 This utility model discloses a gas phase balance device based on the sealing ring of a floating plate, including a tank body 1, a floating plate 2, a breather valve 5, and a vent valve 6.

[0028] Among them, reference Figure 1 The tank body 1 is provided with a tank bottom plate 11. A height limiting member 12 is provided above the tank bottom plate 11. There is a certain distance between the height limiting member 12 and the tank bottom plate 11. The height limiting member 12 is configured to stop the floating roof 2 to prevent the floating roof 2 from descending further, so that the area between the floating roof 2 and the tank bottom plate 11 can be cleaned when the tank is empty.

[0029] It is understandable that the height limiting component 12 can be a ring-shaped barrier set on the inner wall of the tank, or a support frame set on the lower side of the floating roof 2 or the upper side of the tank bottom plate 11.

[0030] Reference Figure 1 and Figure 4The outer edge of the floating plate 2 is provided with a sealing ring 21, which is sealed and fitted to the inner wall of the tank 1. The floating plate 2 divides the interior of the tank 1 into an upper chamber 4 and a storage chamber 3. The upper chamber 4 can communicate with the outside of the tank 1. The storage chamber 3 is used to store the liquid. The floating plate 2 can rise and fall synchronously with the liquid level in the tank 1 within the range above the height limiter 12. When the floating plate 2 is stopped by the height limiter 12, the liquid level in the tank 1 can continue to drop until it is emptied.

[0031] Reference Figure 1 and Figure 4 The breathing valve 5 is installed on the floating plate 2. The breathing valve 5 can connect or disconnect the liquid storage chamber 3 and the upper chamber 4. When the pressure difference between the liquid storage chamber 3 and the upper chamber 4 is within a preset range, the breathing valve 5 is configured to be closed to disconnect the liquid storage chamber 3 and the upper chamber 4. When the pressure difference between the liquid storage chamber 3 and the upper chamber 4 exceeds the preset range, the breathing valve 5 is configured to be open to connect the liquid storage chamber 3 and the upper chamber 4.

[0032] The breathing valve 5 can be an existing breathing valve. It is understood that the breathing valve 5 has independent pressure valve and vacuum valve, and can reasonably set preset range. When the air pressure in the liquid storage chamber 3 relative to the upper chamber 4 exceeds the preset exhalation positive pressure, the pressure valve opens, and the gas in the liquid storage chamber 3 is discharged into the upper chamber 4. When the air pressure in the liquid storage chamber 3 relative to the upper chamber 4 exceeds the preset inhalation negative pressure, the vacuum valve opens, and the gas in the upper chamber 4 enters the liquid storage chamber 3.

[0033] Reference Figure 1 Figure 2 and Figure 3 The vent valve 6 includes a valve body 61, a valve cover 62, a valve stem 63, and an elastic reset member. The valve body 61 is mounted on the float 2. The valve stem 63 extends in the vertical direction. The upper end of the valve stem 63 is fixedly connected to the valve cover 62, and the lower end passes through the valve body 61 and extends into the liquid storage chamber 3. The elastic reset member is located between the valve stem 63 and the valve body 61 or between the valve cover 62 and the valve body 61.

[0034] It should be noted that the inside of the valve body 61 is connected to the liquid storage chamber 3, and the outside is connected to the upper chamber 4. Therefore, whether the valve cover 62 is sealed and closed on the valve body 61 determines whether the liquid storage chamber 3 and the upper chamber 4 are isolated.

[0035] When the floating roof 2 is not stopped by the height limiting component 12, refer to Figure 2 Under the action of the elastic reset member, the valve cover 62 can seal and cover the valve body 61 to isolate the liquid storage chamber 3 and the upper chamber 4, and make the length of the valve stem 63 extending into the liquid storage chamber 3 greater than the distance between the height limiting member 12 and the tank bottom plate 11; when the floating plate 2 is stopped by the height limiting member 12, refer to Figure 3The lower end of the valve stem 63 abuts against the bottom plate 11 of the tank and lifts the valve cover 62 upward away from the valve body 61 to connect the liquid storage chamber 3 and the upper chamber 4.

[0036] This balancing device can automatically control the pressure balance of the liquid-gas phase, mainly in the following three situations:

[0037] I. Tank Feeding Operation: In the initial feeding stage, the liquid level in tank 1 is relatively low and has not yet reached the height limiter 12. The float 2 is stopped by the height limiter 12, the lower end of the valve stem 63 is stopped by the tank bottom plate 11, the valve cover 62 is completely lifted away from the valve body 61, the liquid storage chamber 3 and the upper chamber 4 are connected, and the gas in the liquid storage chamber 3 is discharged into the upper chamber 4. After the liquid level in tank 1 exceeds the height limiter 12, the float 2 rises synchronously with the liquid level in tank 1, and the lower end of the valve stem 63... Not blocked by the bottom plate 11, the valve cover 62 is sealed and closed onto the valve body 61 under the action of the elastic reset member, separating the liquid storage chamber 3 and the upper chamber 4. Due to the intense movement of the liquid being fed, the pressure difference between the liquid storage chamber 3 and the upper chamber 4 usually exceeds the preset range. The breather valve 5 opens automatically, connecting the liquid storage chamber 3 and the upper chamber 4. The gas in the liquid storage chamber 3 is discharged to the upper chamber 4, so that the excess gas can be discharged in time when the tank is fed, ensuring the sealing between the floating plate 2 and the inner wall of the tank body 1.

[0038] II. Daily storage of the liquid: Normally, when the pressure difference between the liquid storage chamber 3 and the upper chamber 4 is within the preset range, the breather valve 5 will automatically close, isolating the liquid storage chamber 3 and the upper chamber 4, ensuring the normal operation of the liquid storage during daily storage, preventing excessive discharge, and reducing liquid loss; however, if extreme situations occur, such as excessive temperature changes, causing the pressure difference between the liquid storage chamber 3 and the upper chamber 4 to exceed the preset range, the breather valve 5 will automatically open, connecting the liquid storage chamber 3 and the upper chamber 4, ensuring the sealing between the floating plate 2 and the inner wall of the tank 1;

[0039] III. Tank Discharge Operation: In the initial stage of discharge, the float 2 descends synchronously with the liquid level in the tank 1, and the vent valve 6 is closed. The breather valve 5 is also usually closed. In the later stage of discharge, as the float 2 moves downward and approaches the height limiter 12, the lower end of the valve stem 63 is stopped by the tank bottom plate 11 and rises relative to the float 2 and valve body 61, causing the valve cover 62 to gradually move upward away from the valve body 61. When the float 2 is completely stopped by the height limiter 12, the valve cover 62 is completely lifted away from the valve body 61, the vent valve 6 opens, connecting the liquid storage chamber 3 and the upper chamber 4, replenishing the liquid storage chamber 3 with air, making the pressure on the lower side of the float 2 consistent with the upper side of the float 2, facilitating continued evacuation of the liquid storage, ensuring that the float 2 will not be damaged due to vacuuming, and ensuring stable automatic operation with high reliability.

[0040] In some embodiments of this utility model, reference is made to Figure 2 and Figure 3The valve body 61 includes a valve cylinder 611 that runs vertically through the valve. The lower outer edge of the valve cylinder 611 is fixedly connected to the float 2. The interior of the valve cylinder 611 is connected to the liquid storage chamber 3, and the exterior of the valve cylinder 611 is connected to the upper chamber 4. The valve cover 62 can seal and cover or lift off the upper end of the valve cylinder 611 to close or open the vent valve 6.

[0041] To provide precise guidance for the up-and-down movement of the valve stem 63, in some embodiments, reference is made to... Figure 2 and Figure 3 The valve body 61 also includes a straightening guide sleeve 612 extending in the vertical direction. The straightening guide sleeve 612 is located inside the valve cylinder 611 and is coaxially arranged with the valve cylinder 611. The straightening guide sleeve 612 is fixedly connected to the valve cylinder 611 through the connecting plate 613, thereby realizing the function of supporting the straightening guide sleeve 612. The valve stem 63 passes through the straightening guide sleeve 612 and is slidably connected to the straightening guide sleeve 612 in the vertical direction. The straightening guide sleeve 612 provides a guiding function for the valve stem 63, ensuring that the valve stem 63 can slide smoothly and accurately in the vertical direction.

[0042] Multiple connecting plates 613 can be provided. The multiple connecting plates 613 are radially distributed along the circumference of the straightening guide sleeve 612. The multiple connecting plates 613 will not completely block the interior of the valve body 61. Sufficient space is left between two adjacent connecting plates 613 for the upper port of the valve body 61 to communicate with the liquid storage chamber 3.

[0043] In some embodiments, refer to Figure 2 A clamping ring 64 is provided on the lower side of the valve cover 62. The valve cover 62 can press the upper end of the sealing valve cylinder 611 through the clamping ring 64 to ensure sufficient sealing when the valve cover 62 is closed on the upper port of the valve cylinder 611.

[0044] To prevent the valve stem 63 from damaging the tank bottom plate 11, a pad 13 can be installed on the tank bottom plate 11. The pad 13 is used to stop the lower end of the valve stem 63 and avoid collision damage between the valve stem 63 and the tank bottom plate 11. It is understood that the thickness of the pad 13 has a negligible impact on the opening height of the vent valve 6.

[0045] In some embodiments, refer to Figure 1 The floating platform 2 includes a single platform 22 and edge floats 23. The edge floats 23 are distributed in a ring around the circumference of the single platform 22. A sealing ring 21 is disposed on the outer edge of the edge floats 23. A breather valve 5 is disposed on the edge floats 23, and a venting valve 6 is disposed on the single platform 22. Multiple breather valves 5 and multiple venting valves 6 can be disposed in a ring around the edge floats 23, and multiple venting valves 6 can be disposed in a ring around the single platform 22.

[0046] Reference Figure 4In some embodiments, a gap space 7 is formed between the outer edge of the edge float 23 and the inner wall of the tank 1 in the area below the sealing ring 21, which communicates with the liquid storage chamber 3. An opening 231 communicating with the gap space 7 is opened on the outer edge of the edge float 23. The breather valve 5 is connected to the opening 231 through the pipe 8, ensuring that the lower part of the breather valve 5 is connected to the liquid storage chamber 3.

[0047] The preset range can be set from -294 Pa to 353 Pa. A negative value indicates that the liquid storage chamber 3 is under negative pressure relative to the upper chamber 4, and a positive value indicates that the liquid storage chamber 3 is under positive pressure relative to the upper chamber 4. When the pressure difference between the liquid storage chamber 3 and the upper chamber 4 is between -294 Pa and 353 Pa, the breathing valve 5 is configured to be closed to isolate the liquid storage chamber 3 and the upper chamber 4. When the pressure difference between the liquid storage chamber 3 and the upper chamber 4 is less than -294 Pa or greater than 353 Pa, the breathing valve 5 is configured to be open to connect the liquid storage chamber 3 and the upper chamber 4.

[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A gas phase balance device based on the floating roof sealing ring, characterized in that, include: The tank body has a bottom plate at the bottom, and a height limiting component is provided above the bottom plate. The floating plate has a sealing ring on its outer edge, which is sealed and fitted to the inner wall of the tank. The floating plate divides the interior of the tank into an upper chamber and a liquid storage chamber. The floating plate can rise and fall synchronously with the liquid level in the tank within the range above the height limiter. The height limiter is configured to stop the floating plate. A breathing valve is disposed on the floating plate. The breathing valve can connect or disconnect the liquid storage chamber and the upper chamber. When the pressure difference between the liquid storage chamber and the upper chamber is within a preset range, the breathing valve is configured to be closed to disconnect the liquid storage chamber and the upper chamber. When the pressure difference between the liquid storage chamber and the upper chamber exceeds the preset range, the breathing valve is configured to be open to connect the liquid storage chamber and the upper chamber. A vent valve includes a valve body, a valve cover, a valve stem, and a resilient reset member. The valve body is mounted on the floating roof. The valve stem extends vertically, with its upper end fixedly connected to the valve cover and its lower end passing through the valve body and extending into the liquid storage chamber. The resilient reset member is positioned between the valve stem and the valve body, or between the valve cover and the valve body. When the floating roof is not stopped by the height limiting member, the valve cover, under the action of the resilient reset member, can seal and cover the valve body to isolate the liquid storage chamber and the upper chamber, and the length of the valve stem extending into the liquid storage chamber is greater than the distance between the height limiting member and the tank bottom plate. When the floating roof is stopped by the height limiting member, the lower end of the valve stem abuts against the tank bottom plate, causing the valve cover to lift upward away from the valve body, thereby connecting the liquid storage chamber and the upper chamber.

2. The gas phase balance device based on the floating disk sealing ring according to claim 1, characterized in that, The valve body includes a valve cylinder that runs vertically through the valve. The lower outer edge of the valve cylinder is fixedly connected to the float. The interior of the valve cylinder is connected to the liquid storage chamber. The valve cover can be sealed and closed or lifted upward away from the upper end of the valve cylinder.

3. The gas phase balance device based on the floating disk sealing ring according to claim 2, characterized in that, The valve body also includes a straightening guide sleeve extending in the vertical direction. The straightening guide sleeve is located inside the valve cylinder and is coaxially arranged with the valve cylinder. The straightening guide sleeve is fixedly connected to the valve cylinder through a connecting plate. The valve stem passes through the straightening guide sleeve and is slidably connected to the straightening guide sleeve in the vertical direction.

4. The gas phase balance device based on the floating disk sealing ring according to claim 3, characterized in that, The connecting plate is provided in multiple pieces, and the multiple connecting plates are radially distributed along the circumference of the straightening guide sleeve.

5. The gas phase balance device based on the floating disk sealing ring according to claim 2, characterized in that, A clamping ring is provided on the lower side of the valve cover, and the valve cover can press and seal the upper end of the valve cylinder through the clamping ring.

6. The gas phase balance device based on the floating disk sealing ring according to claim 1, characterized in that, A pad is provided on the bottom plate of the tank, and the pad is used to abut the lower end of the valve stem.

7. The floating disk sealing ring-based gas phase balance device according to claim 1, characterized in that, The floating roof includes a single disc and edge buoys. The edge buoys are distributed in a ring around the circumference of the single disc. The sealing ring is disposed on the outer edge of the edge buoys. The breathing valve is disposed on the edge buoys. The venting valve is disposed on the single disc.

8. The floating disk sealing ring-based gas phase balance device according to claim 7, characterized in that, Multiple breathing valves and multiple ventilation valves are provided, with multiple breathing valves arranged in a ring on the edge float and multiple ventilation valves arranged in a ring on the single disc.

9. The floating disk sealing ring-based gas phase balance device according to claim 7, characterized in that, A gap space connecting the liquid storage chamber is formed between the outer edge of the edge float and the inner wall of the tank in the area below the sealing ring. An opening connecting the gap space is provided on the outer edge of the edge float, and the breather valve is connected to the opening through a pipe.

10. The floating disk sealing ring-based gas phase balance device according to claim 1 or 9, characterized in that, When the pressure difference between the liquid storage chamber and the upper chamber is between -294 Pa and 353 Pa, the breathing valve is configured to be closed to isolate the liquid storage chamber and the upper chamber. When the pressure difference between the liquid storage chamber and the upper chamber is less than -294 Pa or greater than 353 Pa, the breathing valve is configured to be open to connect the liquid storage chamber and the upper chamber.

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